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mm/memcontrol.c
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/* memcontrol.c - Memory Controller * * Copyright IBM Corporation, 2007 * Author Balbir Singh <balbir@linux.vnet.ibm.com> * |
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* Copyright 2007 OpenVZ SWsoft Inc * Author: Pavel Emelianov <xemul@openvz.org> * |
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* Memory thresholds * Copyright (C) 2009 Nokia Corporation * Author: Kirill A. Shutemov * |
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* This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/res_counter.h> #include <linux/memcontrol.h> #include <linux/cgroup.h> |
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#include <linux/mm.h> |
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#include <linux/hugetlb.h> |
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#include <linux/pagemap.h> |
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#include <linux/smp.h> |
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#include <linux/page-flags.h> |
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#include <linux/backing-dev.h> |
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#include <linux/bit_spinlock.h> #include <linux/rcupdate.h> |
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#include <linux/limits.h> |
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#include <linux/mutex.h> |
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#include <linux/rbtree.h> |
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#include <linux/slab.h> |
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#include <linux/swap.h> |
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#include <linux/swapops.h> |
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#include <linux/spinlock.h> |
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#include <linux/eventfd.h> #include <linux/sort.h> |
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#include <linux/fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/vmalloc.h> |
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#include <linux/mm_inline.h> |
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#include <linux/page_cgroup.h> |
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#include <linux/cpu.h> |
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#include "internal.h" |
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#include <asm/uaccess.h> |
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struct cgroup_subsys mem_cgroup_subsys __read_mostly; |
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#define MEM_CGROUP_RECLAIM_RETRIES 5 |
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struct mem_cgroup *root_mem_cgroup __read_mostly; |
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
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/* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */ |
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int do_swap_account __read_mostly; static int really_do_swap_account __initdata = 1; /* for remember boot option*/ #else #define do_swap_account (0) #endif |
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/* * Per memcg event counter is incremented at every pagein/pageout. This counter * is used for trigger some periodic events. This is straightforward and better * than using jiffies etc. to handle periodic memcg event. * * These values will be used as !((event) & ((1 <<(thresh)) - 1)) */ #define THRESHOLDS_EVENTS_THRESH (7) /* once in 128 */ #define SOFTLIMIT_EVENTS_THRESH (10) /* once in 1024 */ |
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/* |
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* Statistics for memory cgroup. */ enum mem_cgroup_stat_index { /* * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. */ MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ |
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MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ |
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MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ |
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MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */ MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */ |
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MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */ |
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MEM_CGROUP_EVENTS, /* incremented at every pagein/pageout */ |
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MEM_CGROUP_STAT_NSTATS, }; struct mem_cgroup_stat_cpu { s64 count[MEM_CGROUP_STAT_NSTATS]; |
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}; |
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/* |
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* per-zone information in memory controller. */ |
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struct mem_cgroup_per_zone { |
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/* * spin_lock to protect the per cgroup LRU */ |
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struct list_head lists[NR_LRU_LISTS]; unsigned long count[NR_LRU_LISTS]; |
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struct zone_reclaim_stat reclaim_stat; |
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struct rb_node tree_node; /* RB tree node */ unsigned long long usage_in_excess;/* Set to the value by which */ /* the soft limit is exceeded*/ bool on_tree; |
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struct mem_cgroup *mem; /* Back pointer, we cannot */ /* use container_of */ |
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}; /* Macro for accessing counter */ #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)]) struct mem_cgroup_per_node { struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; }; struct mem_cgroup_lru_info { struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; }; /* |
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* Cgroups above their limits are maintained in a RB-Tree, independent of * their hierarchy representation */ struct mem_cgroup_tree_per_zone { struct rb_root rb_root; spinlock_t lock; }; struct mem_cgroup_tree_per_node { struct mem_cgroup_tree_per_zone rb_tree_per_zone[MAX_NR_ZONES]; }; struct mem_cgroup_tree { struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES]; }; static struct mem_cgroup_tree soft_limit_tree __read_mostly; |
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struct mem_cgroup_threshold { struct eventfd_ctx *eventfd; u64 threshold; }; |
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/* For threshold */ |
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struct mem_cgroup_threshold_ary { /* An array index points to threshold just below usage. */ |
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int current_threshold; |
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/* Size of entries[] */ unsigned int size; /* Array of thresholds */ struct mem_cgroup_threshold entries[0]; }; |
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struct mem_cgroup_thresholds { /* Primary thresholds array */ struct mem_cgroup_threshold_ary *primary; /* * Spare threshold array. * This is needed to make mem_cgroup_unregister_event() "never fail". * It must be able to store at least primary->size - 1 entries. */ struct mem_cgroup_threshold_ary *spare; }; |
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/* for OOM */ struct mem_cgroup_eventfd_list { struct list_head list; struct eventfd_ctx *eventfd; }; |
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static void mem_cgroup_threshold(struct mem_cgroup *mem); |
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static void mem_cgroup_oom_notify(struct mem_cgroup *mem); |
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/* |
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* The memory controller data structure. The memory controller controls both * page cache and RSS per cgroup. We would eventually like to provide * statistics based on the statistics developed by Rik Van Riel for clock-pro, * to help the administrator determine what knobs to tune. * * TODO: Add a water mark for the memory controller. Reclaim will begin when |
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* we hit the water mark. May be even add a low water mark, such that * no reclaim occurs from a cgroup at it's low water mark, this is * a feature that will be implemented much later in the future. |
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*/ struct mem_cgroup { struct cgroup_subsys_state css; /* * the counter to account for memory usage */ struct res_counter res; |
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/* |
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* the counter to account for mem+swap usage. */ struct res_counter memsw; /* |
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* Per cgroup active and inactive list, similar to the * per zone LRU lists. |
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*/ |
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struct mem_cgroup_lru_info info; |
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/* protect against reclaim related member. */ spinlock_t reclaim_param_lock; |
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int prev_priority; /* for recording reclaim priority */ |
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/* |
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* While reclaiming in a hierarchy, we cache the last child we |
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* reclaimed from. |
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*/ |
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int last_scanned_child; |
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/* * Should the accounting and control be hierarchical, per subtree? */ bool use_hierarchy; |
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atomic_t oom_lock; |
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atomic_t refcnt; |
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unsigned int swappiness; |
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/* OOM-Killer disable */ int oom_kill_disable; |
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/* set when res.limit == memsw.limit */ bool memsw_is_minimum; |
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/* protect arrays of thresholds */ struct mutex thresholds_lock; /* thresholds for memory usage. RCU-protected */ |
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struct mem_cgroup_thresholds thresholds; |
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/* thresholds for mem+swap usage. RCU-protected */ |
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struct mem_cgroup_thresholds memsw_thresholds; |
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/* For oom notifier event fd */ struct list_head oom_notify; |
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/* |
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* Should we move charges of a task when a task is moved into this * mem_cgroup ? And what type of charges should we move ? */ unsigned long move_charge_at_immigrate; |
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/* |
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* percpu counter. |
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*/ |
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struct mem_cgroup_stat_cpu *stat; |
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}; |
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/* Stuffs for move charges at task migration. */ /* * Types of charges to be moved. "move_charge_at_immitgrate" is treated as a * left-shifted bitmap of these types. */ enum move_type { |
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MOVE_CHARGE_TYPE_ANON, /* private anonymous page and swap of it */ |
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MOVE_CHARGE_TYPE_FILE, /* file page(including tmpfs) and swap of it */ |
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NR_MOVE_TYPE, }; |
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/* "mc" and its members are protected by cgroup_mutex */ static struct move_charge_struct { struct mem_cgroup *from; struct mem_cgroup *to; unsigned long precharge; |
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unsigned long moved_charge; |
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unsigned long moved_swap; |
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struct task_struct *moving_task; /* a task moving charges */ wait_queue_head_t waitq; /* a waitq for other context */ } mc = { .waitq = __WAIT_QUEUE_HEAD_INITIALIZER(mc.waitq), }; |
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static bool move_anon(void) { return test_bit(MOVE_CHARGE_TYPE_ANON, &mc.to->move_charge_at_immigrate); } |
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static bool move_file(void) { return test_bit(MOVE_CHARGE_TYPE_FILE, &mc.to->move_charge_at_immigrate); } |
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/* * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft * limit reclaim to prevent infinite loops, if they ever occur. */ #define MEM_CGROUP_MAX_RECLAIM_LOOPS (100) #define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS (2) |
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enum charge_type { MEM_CGROUP_CHARGE_TYPE_CACHE = 0, MEM_CGROUP_CHARGE_TYPE_MAPPED, |
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MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */ |
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MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */ |
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MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */ |
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MEM_CGROUP_CHARGE_TYPE_DROP, /* a page was unused swap cache */ |
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NR_CHARGE_TYPE, }; |
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/* only for here (for easy reading.) */ #define PCGF_CACHE (1UL << PCG_CACHE) #define PCGF_USED (1UL << PCG_USED) |
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#define PCGF_LOCK (1UL << PCG_LOCK) |
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/* Not used, but added here for completeness */ #define PCGF_ACCT (1UL << PCG_ACCT) |
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/* for encoding cft->private value on file */ #define _MEM (0) #define _MEMSWAP (1) |
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#define _OOM_TYPE (2) |
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#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) #define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff) #define MEMFILE_ATTR(val) ((val) & 0xffff) |
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/* Used for OOM nofiier */ #define OOM_CONTROL (0) |
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/* * Reclaim flags for mem_cgroup_hierarchical_reclaim */ #define MEM_CGROUP_RECLAIM_NOSWAP_BIT 0x0 #define MEM_CGROUP_RECLAIM_NOSWAP (1 << MEM_CGROUP_RECLAIM_NOSWAP_BIT) #define MEM_CGROUP_RECLAIM_SHRINK_BIT 0x1 #define MEM_CGROUP_RECLAIM_SHRINK (1 << MEM_CGROUP_RECLAIM_SHRINK_BIT) |
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#define MEM_CGROUP_RECLAIM_SOFT_BIT 0x2 #define MEM_CGROUP_RECLAIM_SOFT (1 << MEM_CGROUP_RECLAIM_SOFT_BIT) |
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static void mem_cgroup_get(struct mem_cgroup *mem); static void mem_cgroup_put(struct mem_cgroup *mem); |
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static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem); |
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static void drain_all_stock_async(void); |
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static struct mem_cgroup_per_zone * mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) { return &mem->info.nodeinfo[nid]->zoneinfo[zid]; } |
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struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem) { return &mem->css; } |
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static struct mem_cgroup_per_zone * page_cgroup_zoneinfo(struct page_cgroup *pc) { struct mem_cgroup *mem = pc->mem_cgroup; int nid = page_cgroup_nid(pc); int zid = page_cgroup_zid(pc); if (!mem) return NULL; return mem_cgroup_zoneinfo(mem, nid, zid); } static struct mem_cgroup_tree_per_zone * soft_limit_tree_node_zone(int nid, int zid) { return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid]; } static struct mem_cgroup_tree_per_zone * soft_limit_tree_from_page(struct page *page) { int nid = page_to_nid(page); int zid = page_zonenum(page); return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid]; } static void |
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__mem_cgroup_insert_exceeded(struct mem_cgroup *mem, |
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struct mem_cgroup_per_zone *mz, |
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struct mem_cgroup_tree_per_zone *mctz, unsigned long long new_usage_in_excess) |
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{ struct rb_node **p = &mctz->rb_root.rb_node; struct rb_node *parent = NULL; struct mem_cgroup_per_zone *mz_node; if (mz->on_tree) return; |
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mz->usage_in_excess = new_usage_in_excess; if (!mz->usage_in_excess) return; |
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while (*p) { parent = *p; mz_node = rb_entry(parent, struct mem_cgroup_per_zone, tree_node); if (mz->usage_in_excess < mz_node->usage_in_excess) p = &(*p)->rb_left; /* * We can't avoid mem cgroups that are over their soft * limit by the same amount */ else if (mz->usage_in_excess >= mz_node->usage_in_excess) p = &(*p)->rb_right; } rb_link_node(&mz->tree_node, parent, p); rb_insert_color(&mz->tree_node, &mctz->rb_root); mz->on_tree = true; |
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} static void __mem_cgroup_remove_exceeded(struct mem_cgroup *mem, struct mem_cgroup_per_zone *mz, struct mem_cgroup_tree_per_zone *mctz) { if (!mz->on_tree) return; rb_erase(&mz->tree_node, &mctz->rb_root); mz->on_tree = false; } static void |
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mem_cgroup_remove_exceeded(struct mem_cgroup *mem, struct mem_cgroup_per_zone *mz, struct mem_cgroup_tree_per_zone *mctz) { spin_lock(&mctz->lock); |
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__mem_cgroup_remove_exceeded(mem, mz, mctz); |
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spin_unlock(&mctz->lock); } |
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static void mem_cgroup_update_tree(struct mem_cgroup *mem, struct page *page) { |
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unsigned long long excess; |
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struct mem_cgroup_per_zone *mz; struct mem_cgroup_tree_per_zone *mctz; |
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int nid = page_to_nid(page); int zid = page_zonenum(page); |
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mctz = soft_limit_tree_from_page(page); /* |
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* Necessary to update all ancestors when hierarchy is used. * because their event counter is not touched. |
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*/ |
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for (; mem; mem = parent_mem_cgroup(mem)) { mz = mem_cgroup_zoneinfo(mem, nid, zid); |
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excess = res_counter_soft_limit_excess(&mem->res); |
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/* * We have to update the tree if mz is on RB-tree or * mem is over its softlimit. */ |
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if (excess || mz->on_tree) { |
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spin_lock(&mctz->lock); /* if on-tree, remove it */ if (mz->on_tree) __mem_cgroup_remove_exceeded(mem, mz, mctz); /* |
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* Insert again. mz->usage_in_excess will be updated. * If excess is 0, no tree ops. |
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*/ |
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__mem_cgroup_insert_exceeded(mem, mz, mctz, excess); |
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spin_unlock(&mctz->lock); } |
f64c3f549 memory controller... |
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} } static void mem_cgroup_remove_from_trees(struct mem_cgroup *mem) { int node, zone; struct mem_cgroup_per_zone *mz; struct mem_cgroup_tree_per_zone *mctz; for_each_node_state(node, N_POSSIBLE) { for (zone = 0; zone < MAX_NR_ZONES; zone++) { mz = mem_cgroup_zoneinfo(mem, node, zone); mctz = soft_limit_tree_node_zone(node, zone); mem_cgroup_remove_exceeded(mem, mz, mctz); } } } |
4e4169535 memory controller... |
468 469 470 471 472 473 474 475 476 |
static inline unsigned long mem_cgroup_get_excess(struct mem_cgroup *mem) { return res_counter_soft_limit_excess(&mem->res) >> PAGE_SHIFT; } static struct mem_cgroup_per_zone * __mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz) { struct rb_node *rightmost = NULL; |
26251eaf9 memcg: fix refcnt... |
477 |
struct mem_cgroup_per_zone *mz; |
4e4169535 memory controller... |
478 479 |
retry: |
26251eaf9 memcg: fix refcnt... |
480 |
mz = NULL; |
4e4169535 memory controller... |
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 |
rightmost = rb_last(&mctz->rb_root); if (!rightmost) goto done; /* Nothing to reclaim from */ mz = rb_entry(rightmost, struct mem_cgroup_per_zone, tree_node); /* * Remove the node now but someone else can add it back, * we will to add it back at the end of reclaim to its correct * position in the tree. */ __mem_cgroup_remove_exceeded(mz->mem, mz, mctz); if (!res_counter_soft_limit_excess(&mz->mem->res) || !css_tryget(&mz->mem->css)) goto retry; done: return mz; } static struct mem_cgroup_per_zone * mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz) { struct mem_cgroup_per_zone *mz; spin_lock(&mctz->lock); mz = __mem_cgroup_largest_soft_limit_node(mctz); spin_unlock(&mctz->lock); return mz; } |
c62b1a3b3 memcg: use generi... |
509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 |
static s64 mem_cgroup_read_stat(struct mem_cgroup *mem, enum mem_cgroup_stat_index idx) { int cpu; s64 val = 0; for_each_possible_cpu(cpu) val += per_cpu(mem->stat->count[idx], cpu); return val; } static s64 mem_cgroup_local_usage(struct mem_cgroup *mem) { s64 ret; ret = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); ret += mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); return ret; } |
0c3e73e84 memcg: improve re... |
528 529 530 531 |
static void mem_cgroup_swap_statistics(struct mem_cgroup *mem, bool charge) { int val = (charge) ? 1 : -1; |
c62b1a3b3 memcg: use generi... |
532 |
this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_SWAPOUT], val); |
0c3e73e84 memcg: improve re... |
533 |
} |
c05555b57 memcg: atomic ops... |
534 535 536 |
static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, struct page_cgroup *pc, bool charge) |
d52aa412d memory cgroup enh... |
537 |
{ |
0c3e73e84 memcg: improve re... |
538 |
int val = (charge) ? 1 : -1; |
d52aa412d memory cgroup enh... |
539 |
|
c62b1a3b3 memcg: use generi... |
540 |
preempt_disable(); |
c05555b57 memcg: atomic ops... |
541 |
if (PageCgroupCache(pc)) |
c62b1a3b3 memcg: use generi... |
542 |
__this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_CACHE], val); |
d52aa412d memory cgroup enh... |
543 |
else |
c62b1a3b3 memcg: use generi... |
544 |
__this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_RSS], val); |
55e462b05 memcg: simple sta... |
545 546 |
if (charge) |
c62b1a3b3 memcg: use generi... |
547 |
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGIN_COUNT]); |
55e462b05 memcg: simple sta... |
548 |
else |
c62b1a3b3 memcg: use generi... |
549 |
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGOUT_COUNT]); |
d2265e6fa memcg : share eve... |
550 |
__this_cpu_inc(mem->stat->count[MEM_CGROUP_EVENTS]); |
2e72b6347 memcg: implement ... |
551 |
|
c62b1a3b3 memcg: use generi... |
552 |
preempt_enable(); |
6d12e2d8d per-zone and recl... |
553 |
} |
14067bb3e memcg: hierarchic... |
554 |
static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem, |
b69408e88 vmscan: Use an in... |
555 |
enum lru_list idx) |
6d12e2d8d per-zone and recl... |
556 557 558 559 560 561 562 563 564 565 566 |
{ int nid, zid; struct mem_cgroup_per_zone *mz; u64 total = 0; for_each_online_node(nid) for (zid = 0; zid < MAX_NR_ZONES; zid++) { mz = mem_cgroup_zoneinfo(mem, nid, zid); total += MEM_CGROUP_ZSTAT(mz, idx); } return total; |
d52aa412d memory cgroup enh... |
567 |
} |
d2265e6fa memcg : share eve... |
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 |
static bool __memcg_event_check(struct mem_cgroup *mem, int event_mask_shift) { s64 val; val = this_cpu_read(mem->stat->count[MEM_CGROUP_EVENTS]); return !(val & ((1 << event_mask_shift) - 1)); } /* * Check events in order. * */ static void memcg_check_events(struct mem_cgroup *mem, struct page *page) { /* threshold event is triggered in finer grain than soft limit */ if (unlikely(__memcg_event_check(mem, THRESHOLDS_EVENTS_THRESH))) { mem_cgroup_threshold(mem); if (unlikely(__memcg_event_check(mem, SOFTLIMIT_EVENTS_THRESH))) mem_cgroup_update_tree(mem, page); } } |
d5b69e38f memcg: memcontrol... |
590 |
static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) |
8cdea7c05 Memory controller... |
591 592 593 594 595 |
{ return container_of(cgroup_subsys_state(cont, mem_cgroup_subsys_id), struct mem_cgroup, css); } |
cf475ad28 cgroups: add an o... |
596 |
struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
78fb74669 Memory controller... |
597 |
{ |
31a78f23b mm owner: fix rac... |
598 599 600 601 602 603 604 |
/* * mm_update_next_owner() may clear mm->owner to NULL * if it races with swapoff, page migration, etc. * So this can be called with p == NULL. */ if (unlikely(!p)) return NULL; |
78fb74669 Memory controller... |
605 606 607 |
return container_of(task_subsys_state(p, mem_cgroup_subsys_id), struct mem_cgroup, css); } |
54595fe26 memcg: use css_tr... |
608 609 610 |
static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) { struct mem_cgroup *mem = NULL; |
0b7f569e4 memcg: fix OOM ki... |
611 612 613 |
if (!mm) return NULL; |
54595fe26 memcg: use css_tr... |
614 615 616 617 618 619 620 621 622 623 624 625 626 627 |
/* * Because we have no locks, mm->owner's may be being moved to other * cgroup. We use css_tryget() here even if this looks * pessimistic (rather than adding locks here). */ rcu_read_lock(); do { mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); if (unlikely(!mem)) break; } while (!css_tryget(&mem->css)); rcu_read_unlock(); return mem; } |
14067bb3e memcg: hierarchic... |
628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 |
/* * Call callback function against all cgroup under hierarchy tree. */ static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data, int (*func)(struct mem_cgroup *, void *)) { int found, ret, nextid; struct cgroup_subsys_state *css; struct mem_cgroup *mem; if (!root->use_hierarchy) return (*func)(root, data); nextid = 1; do { ret = 0; mem = NULL; rcu_read_lock(); css = css_get_next(&mem_cgroup_subsys, nextid, &root->css, &found); if (css && css_tryget(css)) mem = container_of(css, struct mem_cgroup, css); rcu_read_unlock(); if (mem) { ret = (*func)(mem, data); css_put(&mem->css); } nextid = found + 1; } while (!ret && css); return ret; } |
4b3bde4c9 memcg: remove the... |
662 663 664 665 |
static inline bool mem_cgroup_is_root(struct mem_cgroup *mem) { return (mem == root_mem_cgroup); } |
08e552c69 memcg: synchroniz... |
666 667 668 669 670 671 672 673 674 675 676 677 678 |
/* * Following LRU functions are allowed to be used without PCG_LOCK. * Operations are called by routine of global LRU independently from memcg. * What we have to take care of here is validness of pc->mem_cgroup. * * Changes to pc->mem_cgroup happens when * 1. charge * 2. moving account * In typical case, "charge" is done before add-to-lru. Exception is SwapCache. * It is added to LRU before charge. * If PCG_USED bit is not set, page_cgroup is not added to this private LRU. * When moving account, the page is not on LRU. It's isolated. */ |
4f98a2fee vmscan: split LRU... |
679 |
|
08e552c69 memcg: synchroniz... |
680 681 682 |
void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru) { struct page_cgroup *pc; |
08e552c69 memcg: synchroniz... |
683 |
struct mem_cgroup_per_zone *mz; |
6d12e2d8d per-zone and recl... |
684 |
|
f8d665422 memcg: add mem_cg... |
685 |
if (mem_cgroup_disabled()) |
08e552c69 memcg: synchroniz... |
686 687 688 |
return; pc = lookup_page_cgroup(page); /* can happen while we handle swapcache. */ |
4b3bde4c9 memcg: remove the... |
689 |
if (!TestClearPageCgroupAcctLRU(pc)) |
08e552c69 memcg: synchroniz... |
690 |
return; |
4b3bde4c9 memcg: remove the... |
691 |
VM_BUG_ON(!pc->mem_cgroup); |
544122e5e memcg: fix LRU ac... |
692 693 694 695 |
/* * We don't check PCG_USED bit. It's cleared when the "page" is finally * removed from global LRU. */ |
08e552c69 memcg: synchroniz... |
696 |
mz = page_cgroup_zoneinfo(pc); |
b69408e88 vmscan: Use an in... |
697 |
MEM_CGROUP_ZSTAT(mz, lru) -= 1; |
4b3bde4c9 memcg: remove the... |
698 699 700 |
if (mem_cgroup_is_root(pc->mem_cgroup)) return; VM_BUG_ON(list_empty(&pc->lru)); |
08e552c69 memcg: synchroniz... |
701 702 |
list_del_init(&pc->lru); return; |
6d12e2d8d per-zone and recl... |
703 |
} |
08e552c69 memcg: synchroniz... |
704 |
void mem_cgroup_del_lru(struct page *page) |
6d12e2d8d per-zone and recl... |
705 |
{ |
08e552c69 memcg: synchroniz... |
706 707 |
mem_cgroup_del_lru_list(page, page_lru(page)); } |
b69408e88 vmscan: Use an in... |
708 |
|
08e552c69 memcg: synchroniz... |
709 710 711 712 |
void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru) { struct mem_cgroup_per_zone *mz; struct page_cgroup *pc; |
b69408e88 vmscan: Use an in... |
713 |
|
f8d665422 memcg: add mem_cg... |
714 |
if (mem_cgroup_disabled()) |
08e552c69 memcg: synchroniz... |
715 |
return; |
6d12e2d8d per-zone and recl... |
716 |
|
08e552c69 memcg: synchroniz... |
717 |
pc = lookup_page_cgroup(page); |
bd112db87 memcg: fix mem_cg... |
718 719 720 721 |
/* * Used bit is set without atomic ops but after smp_wmb(). * For making pc->mem_cgroup visible, insert smp_rmb() here. */ |
08e552c69 memcg: synchroniz... |
722 |
smp_rmb(); |
4b3bde4c9 memcg: remove the... |
723 724 |
/* unused or root page is not rotated. */ if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup)) |
08e552c69 memcg: synchroniz... |
725 726 727 |
return; mz = page_cgroup_zoneinfo(pc); list_move(&pc->lru, &mz->lists[lru]); |
6d12e2d8d per-zone and recl... |
728 |
} |
08e552c69 memcg: synchroniz... |
729 |
void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru) |
66e1707bc Memory controller... |
730 |
{ |
08e552c69 memcg: synchroniz... |
731 732 |
struct page_cgroup *pc; struct mem_cgroup_per_zone *mz; |
6d12e2d8d per-zone and recl... |
733 |
|
f8d665422 memcg: add mem_cg... |
734 |
if (mem_cgroup_disabled()) |
08e552c69 memcg: synchroniz... |
735 736 |
return; pc = lookup_page_cgroup(page); |
4b3bde4c9 memcg: remove the... |
737 |
VM_BUG_ON(PageCgroupAcctLRU(pc)); |
bd112db87 memcg: fix mem_cg... |
738 739 740 741 |
/* * Used bit is set without atomic ops but after smp_wmb(). * For making pc->mem_cgroup visible, insert smp_rmb() here. */ |
08e552c69 memcg: synchroniz... |
742 743 |
smp_rmb(); if (!PageCgroupUsed(pc)) |
894bc3104 Unevictable LRU I... |
744 |
return; |
b69408e88 vmscan: Use an in... |
745 |
|
08e552c69 memcg: synchroniz... |
746 |
mz = page_cgroup_zoneinfo(pc); |
b69408e88 vmscan: Use an in... |
747 |
MEM_CGROUP_ZSTAT(mz, lru) += 1; |
4b3bde4c9 memcg: remove the... |
748 749 750 |
SetPageCgroupAcctLRU(pc); if (mem_cgroup_is_root(pc->mem_cgroup)) return; |
08e552c69 memcg: synchroniz... |
751 752 |
list_add(&pc->lru, &mz->lists[lru]); } |
544122e5e memcg: fix LRU ac... |
753 |
|
08e552c69 memcg: synchroniz... |
754 |
/* |
544122e5e memcg: fix LRU ac... |
755 756 757 758 759 |
* At handling SwapCache, pc->mem_cgroup may be changed while it's linked to * lru because the page may.be reused after it's fully uncharged (because of * SwapCache behavior).To handle that, unlink page_cgroup from LRU when charge * it again. This function is only used to charge SwapCache. It's done under * lock_page and expected that zone->lru_lock is never held. |
08e552c69 memcg: synchroniz... |
760 |
*/ |
544122e5e memcg: fix LRU ac... |
761 |
static void mem_cgroup_lru_del_before_commit_swapcache(struct page *page) |
08e552c69 memcg: synchroniz... |
762 |
{ |
544122e5e memcg: fix LRU ac... |
763 764 765 766 767 768 769 770 771 772 773 774 |
unsigned long flags; struct zone *zone = page_zone(page); struct page_cgroup *pc = lookup_page_cgroup(page); spin_lock_irqsave(&zone->lru_lock, flags); /* * Forget old LRU when this page_cgroup is *not* used. This Used bit * is guarded by lock_page() because the page is SwapCache. */ if (!PageCgroupUsed(pc)) mem_cgroup_del_lru_list(page, page_lru(page)); spin_unlock_irqrestore(&zone->lru_lock, flags); |
08e552c69 memcg: synchroniz... |
775 |
} |
544122e5e memcg: fix LRU ac... |
776 777 778 779 780 781 782 783 |
static void mem_cgroup_lru_add_after_commit_swapcache(struct page *page) { unsigned long flags; struct zone *zone = page_zone(page); struct page_cgroup *pc = lookup_page_cgroup(page); spin_lock_irqsave(&zone->lru_lock, flags); /* link when the page is linked to LRU but page_cgroup isn't */ |
4b3bde4c9 memcg: remove the... |
784 |
if (PageLRU(page) && !PageCgroupAcctLRU(pc)) |
544122e5e memcg: fix LRU ac... |
785 786 787 |
mem_cgroup_add_lru_list(page, page_lru(page)); spin_unlock_irqrestore(&zone->lru_lock, flags); } |
08e552c69 memcg: synchroniz... |
788 789 790 |
void mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) { |
f8d665422 memcg: add mem_cg... |
791 |
if (mem_cgroup_disabled()) |
08e552c69 memcg: synchroniz... |
792 793 794 |
return; mem_cgroup_del_lru_list(page, from); mem_cgroup_add_lru_list(page, to); |
66e1707bc Memory controller... |
795 |
} |
4c4a22148 memcontrol: move ... |
796 797 798 |
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem) { int ret; |
0b7f569e4 memcg: fix OOM ki... |
799 |
struct mem_cgroup *curr = NULL; |
4c4a22148 memcontrol: move ... |
800 801 |
task_lock(task); |
0b7f569e4 memcg: fix OOM ki... |
802 803 804 |
rcu_read_lock(); curr = try_get_mem_cgroup_from_mm(task->mm); rcu_read_unlock(); |
4c4a22148 memcontrol: move ... |
805 |
task_unlock(task); |
0b7f569e4 memcg: fix OOM ki... |
806 807 |
if (!curr) return 0; |
d31f56dbf memcg: avoid oom-... |
808 809 810 811 812 813 814 |
/* * We should check use_hierarchy of "mem" not "curr". Because checking * use_hierarchy of "curr" here make this function true if hierarchy is * enabled in "curr" and "curr" is a child of "mem" in *cgroup* * hierarchy(even if use_hierarchy is disabled in "mem"). */ if (mem->use_hierarchy) |
0b7f569e4 memcg: fix OOM ki... |
815 816 817 818 |
ret = css_is_ancestor(&curr->css, &mem->css); else ret = (curr == mem); css_put(&curr->css); |
4c4a22148 memcontrol: move ... |
819 820 |
return ret; } |
66e1707bc Memory controller... |
821 |
/* |
6c48a1d04 per-zone and recl... |
822 823 824 825 |
* prev_priority control...this will be used in memory reclaim path. */ int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) { |
2733c06ac memcg: protect pr... |
826 827 828 829 830 831 832 |
int prev_priority; spin_lock(&mem->reclaim_param_lock); prev_priority = mem->prev_priority; spin_unlock(&mem->reclaim_param_lock); return prev_priority; |
6c48a1d04 per-zone and recl... |
833 834 835 836 |
} void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority) { |
2733c06ac memcg: protect pr... |
837 |
spin_lock(&mem->reclaim_param_lock); |
6c48a1d04 per-zone and recl... |
838 839 |
if (priority < mem->prev_priority) mem->prev_priority = priority; |
2733c06ac memcg: protect pr... |
840 |
spin_unlock(&mem->reclaim_param_lock); |
6c48a1d04 per-zone and recl... |
841 842 843 844 |
} void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority) { |
2733c06ac memcg: protect pr... |
845 |
spin_lock(&mem->reclaim_param_lock); |
6c48a1d04 per-zone and recl... |
846 |
mem->prev_priority = priority; |
2733c06ac memcg: protect pr... |
847 |
spin_unlock(&mem->reclaim_param_lock); |
6c48a1d04 per-zone and recl... |
848 |
} |
c772be939 memcg: fix calcul... |
849 |
static int calc_inactive_ratio(struct mem_cgroup *memcg, unsigned long *present_pages) |
14797e236 memcg: add inacti... |
850 851 852 |
{ unsigned long active; unsigned long inactive; |
c772be939 memcg: fix calcul... |
853 854 |
unsigned long gb; unsigned long inactive_ratio; |
14797e236 memcg: add inacti... |
855 |
|
14067bb3e memcg: hierarchic... |
856 857 |
inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_ANON); active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_ANON); |
14797e236 memcg: add inacti... |
858 |
|
c772be939 memcg: fix calcul... |
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 |
gb = (inactive + active) >> (30 - PAGE_SHIFT); if (gb) inactive_ratio = int_sqrt(10 * gb); else inactive_ratio = 1; if (present_pages) { present_pages[0] = inactive; present_pages[1] = active; } return inactive_ratio; } int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) { unsigned long active; unsigned long inactive; unsigned long present_pages[2]; unsigned long inactive_ratio; inactive_ratio = calc_inactive_ratio(memcg, present_pages); inactive = present_pages[0]; active = present_pages[1]; if (inactive * inactive_ratio < active) |
14797e236 memcg: add inacti... |
886 887 888 889 |
return 1; return 0; } |
56e49d218 vmscan: evict use... |
890 891 892 893 894 895 896 897 898 899 |
int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) { unsigned long active; unsigned long inactive; inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_FILE); active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_FILE); return (active > inactive); } |
a3d8e0549 memcg: add mem_cg... |
900 901 902 903 904 905 906 907 908 909 |
unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, enum lru_list lru) { int nid = zone->zone_pgdat->node_id; int zid = zone_idx(zone); struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); return MEM_CGROUP_ZSTAT(mz, lru); } |
3e2f41f1f memcg: add zone_r... |
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 |
struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) { int nid = zone->zone_pgdat->node_id; int zid = zone_idx(zone); struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); return &mz->reclaim_stat; } struct zone_reclaim_stat * mem_cgroup_get_reclaim_stat_from_page(struct page *page) { struct page_cgroup *pc; struct mem_cgroup_per_zone *mz; if (mem_cgroup_disabled()) return NULL; pc = lookup_page_cgroup(page); |
bd112db87 memcg: fix mem_cg... |
930 931 932 933 934 935 936 |
/* * Used bit is set without atomic ops but after smp_wmb(). * For making pc->mem_cgroup visible, insert smp_rmb() here. */ smp_rmb(); if (!PageCgroupUsed(pc)) return NULL; |
3e2f41f1f memcg: add zone_r... |
937 938 939 940 941 942 |
mz = page_cgroup_zoneinfo(pc); if (!mz) return NULL; return &mz->reclaim_stat; } |
66e1707bc Memory controller... |
943 944 945 946 947 |
unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, struct list_head *dst, unsigned long *scanned, int order, int mode, struct zone *z, struct mem_cgroup *mem_cont, |
4f98a2fee vmscan: split LRU... |
948 |
int active, int file) |
66e1707bc Memory controller... |
949 950 951 952 953 954 |
{ unsigned long nr_taken = 0; struct page *page; unsigned long scan; LIST_HEAD(pc_list); struct list_head *src; |
ff7283fa3 bugfix for memory... |
955 |
struct page_cgroup *pc, *tmp; |
1ecaab2bd per-zone and recl... |
956 957 958 |
int nid = z->zone_pgdat->node_id; int zid = zone_idx(z); struct mem_cgroup_per_zone *mz; |
b7c46d151 mm: drop unneeded... |
959 |
int lru = LRU_FILE * file + active; |
2ffebca6a memcg: fix lru ro... |
960 |
int ret; |
66e1707bc Memory controller... |
961 |
|
cf475ad28 cgroups: add an o... |
962 |
BUG_ON(!mem_cont); |
1ecaab2bd per-zone and recl... |
963 |
mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
b69408e88 vmscan: Use an in... |
964 |
src = &mz->lists[lru]; |
66e1707bc Memory controller... |
965 |
|
ff7283fa3 bugfix for memory... |
966 967 |
scan = 0; list_for_each_entry_safe_reverse(pc, tmp, src, lru) { |
436c6541b memcgroup: fix zo... |
968 |
if (scan >= nr_to_scan) |
ff7283fa3 bugfix for memory... |
969 |
break; |
08e552c69 memcg: synchroniz... |
970 971 |
page = pc->page; |
52d4b9ac0 memcg: allocate a... |
972 973 |
if (unlikely(!PageCgroupUsed(pc))) continue; |
436c6541b memcgroup: fix zo... |
974 |
if (unlikely(!PageLRU(page))) |
ff7283fa3 bugfix for memory... |
975 |
continue; |
ff7283fa3 bugfix for memory... |
976 |
|
436c6541b memcgroup: fix zo... |
977 |
scan++; |
2ffebca6a memcg: fix lru ro... |
978 979 980 |
ret = __isolate_lru_page(page, mode, file); switch (ret) { case 0: |
66e1707bc Memory controller... |
981 |
list_move(&page->lru, dst); |
2ffebca6a memcg: fix lru ro... |
982 |
mem_cgroup_del_lru(page); |
66e1707bc Memory controller... |
983 |
nr_taken++; |
2ffebca6a memcg: fix lru ro... |
984 985 986 987 988 989 990 |
break; case -EBUSY: /* we don't affect global LRU but rotate in our LRU */ mem_cgroup_rotate_lru_list(page, page_lru(page)); break; default: break; |
66e1707bc Memory controller... |
991 992 |
} } |
66e1707bc Memory controller... |
993 994 995 |
*scanned = scan; return nr_taken; } |
6d61ef409 memcg: memory cgr... |
996 997 |
#define mem_cgroup_from_res_counter(counter, member) \ container_of(counter, struct mem_cgroup, member) |
b85a96c0b memcg: memory swa... |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 |
static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem) { if (do_swap_account) { if (res_counter_check_under_limit(&mem->res) && res_counter_check_under_limit(&mem->memsw)) return true; } else if (res_counter_check_under_limit(&mem->res)) return true; return false; } |
a7885eb8a memcg: swappiness |
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 |
static unsigned int get_swappiness(struct mem_cgroup *memcg) { struct cgroup *cgrp = memcg->css.cgroup; unsigned int swappiness; /* root ? */ if (cgrp->parent == NULL) return vm_swappiness; spin_lock(&memcg->reclaim_param_lock); swappiness = memcg->swappiness; spin_unlock(&memcg->reclaim_param_lock); return swappiness; } |
81d39c20f memcg: fix shrink... |
1024 1025 1026 1027 1028 1029 |
static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data) { int *val = data; (*val)++; return 0; } |
e222432bf memcg: show memcg... |
1030 1031 |
/** |
6a6135b64 memcg: typo in co... |
1032 |
* mem_cgroup_print_oom_info: Called from OOM with tasklist_lock held in read mode. |
e222432bf memcg: show memcg... |
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 |
* @memcg: The memory cgroup that went over limit * @p: Task that is going to be killed * * NOTE: @memcg and @p's mem_cgroup can be different when hierarchy is * enabled */ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) { struct cgroup *task_cgrp; struct cgroup *mem_cgrp; /* * Need a buffer in BSS, can't rely on allocations. The code relies * on the assumption that OOM is serialized for memory controller. * If this assumption is broken, revisit this code. */ static char memcg_name[PATH_MAX]; int ret; |
d31f56dbf memcg: avoid oom-... |
1050 |
if (!memcg || !p) |
e222432bf memcg: show memcg... |
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 |
return; rcu_read_lock(); mem_cgrp = memcg->css.cgroup; task_cgrp = task_cgroup(p, mem_cgroup_subsys_id); ret = cgroup_path(task_cgrp, memcg_name, PATH_MAX); if (ret < 0) { /* * Unfortunately, we are unable to convert to a useful name * But we'll still print out the usage information */ rcu_read_unlock(); goto done; } rcu_read_unlock(); printk(KERN_INFO "Task in %s killed", memcg_name); rcu_read_lock(); ret = cgroup_path(mem_cgrp, memcg_name, PATH_MAX); if (ret < 0) { rcu_read_unlock(); goto done; } rcu_read_unlock(); /* * Continues from above, so we don't need an KERN_ level */ printk(KERN_CONT " as a result of limit of %s ", memcg_name); done: printk(KERN_INFO "memory: usage %llukB, limit %llukB, failcnt %llu ", res_counter_read_u64(&memcg->res, RES_USAGE) >> 10, res_counter_read_u64(&memcg->res, RES_LIMIT) >> 10, res_counter_read_u64(&memcg->res, RES_FAILCNT)); printk(KERN_INFO "memory+swap: usage %llukB, limit %llukB, " "failcnt %llu ", res_counter_read_u64(&memcg->memsw, RES_USAGE) >> 10, res_counter_read_u64(&memcg->memsw, RES_LIMIT) >> 10, res_counter_read_u64(&memcg->memsw, RES_FAILCNT)); } |
81d39c20f memcg: fix shrink... |
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 |
/* * This function returns the number of memcg under hierarchy tree. Returns * 1(self count) if no children. */ static int mem_cgroup_count_children(struct mem_cgroup *mem) { int num = 0; mem_cgroup_walk_tree(mem, &num, mem_cgroup_count_children_cb); return num; } |
6d61ef409 memcg: memory cgr... |
1109 |
/* |
04046e1a0 memcg: use CSS ID |
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 |
* Visit the first child (need not be the first child as per the ordering * of the cgroup list, since we track last_scanned_child) of @mem and use * that to reclaim free pages from. */ static struct mem_cgroup * mem_cgroup_select_victim(struct mem_cgroup *root_mem) { struct mem_cgroup *ret = NULL; struct cgroup_subsys_state *css; int nextid, found; if (!root_mem->use_hierarchy) { css_get(&root_mem->css); ret = root_mem; } while (!ret) { rcu_read_lock(); nextid = root_mem->last_scanned_child + 1; css = css_get_next(&mem_cgroup_subsys, nextid, &root_mem->css, &found); if (css && css_tryget(css)) ret = container_of(css, struct mem_cgroup, css); rcu_read_unlock(); /* Updates scanning parameter */ spin_lock(&root_mem->reclaim_param_lock); if (!css) { /* this means start scan from ID:1 */ root_mem->last_scanned_child = 0; } else root_mem->last_scanned_child = found; spin_unlock(&root_mem->reclaim_param_lock); } return ret; } /* * Scan the hierarchy if needed to reclaim memory. We remember the last child * we reclaimed from, so that we don't end up penalizing one child extensively * based on its position in the children list. |
6d61ef409 memcg: memory cgr... |
1152 1153 |
* * root_mem is the original ancestor that we've been reclaim from. |
04046e1a0 memcg: use CSS ID |
1154 1155 1156 |
* * We give up and return to the caller when we visit root_mem twice. * (other groups can be removed while we're walking....) |
81d39c20f memcg: fix shrink... |
1157 1158 |
* * If shrink==true, for avoiding to free too much, this returns immedieately. |
6d61ef409 memcg: memory cgr... |
1159 1160 |
*/ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem, |
4e4169535 memory controller... |
1161 |
struct zone *zone, |
75822b449 memory controller... |
1162 1163 |
gfp_t gfp_mask, unsigned long reclaim_options) |
6d61ef409 memcg: memory cgr... |
1164 |
{ |
04046e1a0 memcg: use CSS ID |
1165 1166 1167 |
struct mem_cgroup *victim; int ret, total = 0; int loop = 0; |
75822b449 memory controller... |
1168 1169 |
bool noswap = reclaim_options & MEM_CGROUP_RECLAIM_NOSWAP; bool shrink = reclaim_options & MEM_CGROUP_RECLAIM_SHRINK; |
4e4169535 memory controller... |
1170 1171 |
bool check_soft = reclaim_options & MEM_CGROUP_RECLAIM_SOFT; unsigned long excess = mem_cgroup_get_excess(root_mem); |
04046e1a0 memcg: use CSS ID |
1172 |
|
22a668d7c memcg: fix behavi... |
1173 1174 1175 |
/* If memsw_is_minimum==1, swap-out is of-no-use. */ if (root_mem->memsw_is_minimum) noswap = true; |
4e4169535 memory controller... |
1176 |
while (1) { |
04046e1a0 memcg: use CSS ID |
1177 |
victim = mem_cgroup_select_victim(root_mem); |
4e4169535 memory controller... |
1178 |
if (victim == root_mem) { |
04046e1a0 memcg: use CSS ID |
1179 |
loop++; |
cdec2e426 memcg: coalesce c... |
1180 1181 |
if (loop >= 1) drain_all_stock_async(); |
4e4169535 memory controller... |
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 |
if (loop >= 2) { /* * If we have not been able to reclaim * anything, it might because there are * no reclaimable pages under this hierarchy */ if (!check_soft || !total) { css_put(&victim->css); break; } /* * We want to do more targetted reclaim. * excess >> 2 is not to excessive so as to * reclaim too much, nor too less that we keep * coming back to reclaim from this cgroup */ if (total >= (excess >> 2) || (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) { css_put(&victim->css); break; } } } |
c62b1a3b3 memcg: use generi... |
1205 |
if (!mem_cgroup_local_usage(victim)) { |
04046e1a0 memcg: use CSS ID |
1206 1207 |
/* this cgroup's local usage == 0 */ css_put(&victim->css); |
6d61ef409 memcg: memory cgr... |
1208 1209 |
continue; } |
04046e1a0 memcg: use CSS ID |
1210 |
/* we use swappiness of local cgroup */ |
4e4169535 memory controller... |
1211 1212 1213 1214 1215 1216 1217 |
if (check_soft) ret = mem_cgroup_shrink_node_zone(victim, gfp_mask, noswap, get_swappiness(victim), zone, zone->zone_pgdat->node_id); else ret = try_to_free_mem_cgroup_pages(victim, gfp_mask, noswap, get_swappiness(victim)); |
04046e1a0 memcg: use CSS ID |
1218 |
css_put(&victim->css); |
81d39c20f memcg: fix shrink... |
1219 1220 1221 1222 1223 1224 1225 |
/* * At shrinking usage, we can't check we should stop here or * reclaim more. It's depends on callers. last_scanned_child * will work enough for keeping fairness under tree. */ if (shrink) return ret; |
04046e1a0 memcg: use CSS ID |
1226 |
total += ret; |
4e4169535 memory controller... |
1227 1228 1229 1230 |
if (check_soft) { if (res_counter_check_under_soft_limit(&root_mem->res)) return total; } else if (mem_cgroup_check_under_limit(root_mem)) |
04046e1a0 memcg: use CSS ID |
1231 |
return 1 + total; |
6d61ef409 memcg: memory cgr... |
1232 |
} |
04046e1a0 memcg: use CSS ID |
1233 |
return total; |
6d61ef409 memcg: memory cgr... |
1234 |
} |
867578cbc memcg: fix oom ki... |
1235 |
static int mem_cgroup_oom_lock_cb(struct mem_cgroup *mem, void *data) |
a636b327f memcg: avoid unne... |
1236 |
{ |
867578cbc memcg: fix oom ki... |
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 |
int *val = (int *)data; int x; /* * Logically, we can stop scanning immediately when we find * a memcg is already locked. But condidering unlock ops and * creation/removal of memcg, scan-all is simple operation. */ x = atomic_inc_return(&mem->oom_lock); *val = max(x, *val); return 0; } /* * Check OOM-Killer is already running under our hierarchy. * If someone is running, return false. */ static bool mem_cgroup_oom_lock(struct mem_cgroup *mem) { int lock_count = 0; |
a636b327f memcg: avoid unne... |
1255 |
|
867578cbc memcg: fix oom ki... |
1256 1257 1258 1259 1260 |
mem_cgroup_walk_tree(mem, &lock_count, mem_cgroup_oom_lock_cb); if (lock_count == 1) return true; return false; |
a636b327f memcg: avoid unne... |
1261 |
} |
0b7f569e4 memcg: fix OOM ki... |
1262 |
|
867578cbc memcg: fix oom ki... |
1263 |
static int mem_cgroup_oom_unlock_cb(struct mem_cgroup *mem, void *data) |
0b7f569e4 memcg: fix OOM ki... |
1264 |
{ |
867578cbc memcg: fix oom ki... |
1265 1266 1267 1268 1269 1270 |
/* * When a new child is created while the hierarchy is under oom, * mem_cgroup_oom_lock() may not be called. We have to use * atomic_add_unless() here. */ atomic_add_unless(&mem->oom_lock, -1, 0); |
0b7f569e4 memcg: fix OOM ki... |
1271 1272 |
return 0; } |
867578cbc memcg: fix oom ki... |
1273 1274 1275 1276 1277 1278 1279 |
static void mem_cgroup_oom_unlock(struct mem_cgroup *mem) { mem_cgroup_walk_tree(mem, NULL, mem_cgroup_oom_unlock_cb); } static DEFINE_MUTEX(memcg_oom_mutex); static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq); |
dc98df5a1 memcg: oom wakeup... |
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 |
struct oom_wait_info { struct mem_cgroup *mem; wait_queue_t wait; }; static int memcg_oom_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *arg) { struct mem_cgroup *wake_mem = (struct mem_cgroup *)arg; struct oom_wait_info *oom_wait_info; oom_wait_info = container_of(wait, struct oom_wait_info, wait); if (oom_wait_info->mem == wake_mem) goto wakeup; /* if no hierarchy, no match */ if (!oom_wait_info->mem->use_hierarchy || !wake_mem->use_hierarchy) return 0; /* * Both of oom_wait_info->mem and wake_mem are stable under us. * Then we can use css_is_ancestor without taking care of RCU. */ if (!css_is_ancestor(&oom_wait_info->mem->css, &wake_mem->css) && !css_is_ancestor(&wake_mem->css, &oom_wait_info->mem->css)) return 0; wakeup: return autoremove_wake_function(wait, mode, sync, arg); } static void memcg_wakeup_oom(struct mem_cgroup *mem) { /* for filtering, pass "mem" as argument. */ __wake_up(&memcg_oom_waitq, TASK_NORMAL, 0, mem); } |
3c11ecf44 memcg: oom kill d... |
1315 1316 |
static void memcg_oom_recover(struct mem_cgroup *mem) { |
4d845ebf4 memcg: fix wake u... |
1317 |
if (atomic_read(&mem->oom_lock)) |
3c11ecf44 memcg: oom kill d... |
1318 1319 |
memcg_wakeup_oom(mem); } |
867578cbc memcg: fix oom ki... |
1320 1321 1322 1323 |
/* * try to call OOM killer. returns false if we should exit memory-reclaim loop. */ bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask) |
0b7f569e4 memcg: fix OOM ki... |
1324 |
{ |
dc98df5a1 memcg: oom wakeup... |
1325 |
struct oom_wait_info owait; |
3c11ecf44 memcg: oom kill d... |
1326 |
bool locked, need_to_kill; |
867578cbc memcg: fix oom ki... |
1327 |
|
dc98df5a1 memcg: oom wakeup... |
1328 1329 1330 1331 1332 |
owait.mem = mem; owait.wait.flags = 0; owait.wait.func = memcg_oom_wake_function; owait.wait.private = current; INIT_LIST_HEAD(&owait.wait.task_list); |
3c11ecf44 memcg: oom kill d... |
1333 |
need_to_kill = true; |
867578cbc memcg: fix oom ki... |
1334 1335 1336 1337 1338 1339 1340 1341 |
/* At first, try to OOM lock hierarchy under mem.*/ mutex_lock(&memcg_oom_mutex); locked = mem_cgroup_oom_lock(mem); /* * Even if signal_pending(), we can't quit charge() loop without * accounting. So, UNINTERRUPTIBLE is appropriate. But SIGKILL * under OOM is always welcomed, use TASK_KILLABLE here. */ |
3c11ecf44 memcg: oom kill d... |
1342 1343 1344 1345 |
prepare_to_wait(&memcg_oom_waitq, &owait.wait, TASK_KILLABLE); if (!locked || mem->oom_kill_disable) need_to_kill = false; if (locked) |
9490ff275 memcg: oom notifier |
1346 |
mem_cgroup_oom_notify(mem); |
867578cbc memcg: fix oom ki... |
1347 |
mutex_unlock(&memcg_oom_mutex); |
3c11ecf44 memcg: oom kill d... |
1348 1349 |
if (need_to_kill) { finish_wait(&memcg_oom_waitq, &owait.wait); |
867578cbc memcg: fix oom ki... |
1350 |
mem_cgroup_out_of_memory(mem, mask); |
3c11ecf44 memcg: oom kill d... |
1351 |
} else { |
867578cbc memcg: fix oom ki... |
1352 |
schedule(); |
dc98df5a1 memcg: oom wakeup... |
1353 |
finish_wait(&memcg_oom_waitq, &owait.wait); |
867578cbc memcg: fix oom ki... |
1354 1355 1356 |
} mutex_lock(&memcg_oom_mutex); mem_cgroup_oom_unlock(mem); |
dc98df5a1 memcg: oom wakeup... |
1357 |
memcg_wakeup_oom(mem); |
867578cbc memcg: fix oom ki... |
1358 1359 1360 1361 1362 1363 1364 |
mutex_unlock(&memcg_oom_mutex); if (test_thread_flag(TIF_MEMDIE) || fatal_signal_pending(current)) return false; /* Give chance to dying process */ schedule_timeout(1); return true; |
0b7f569e4 memcg: fix OOM ki... |
1365 |
} |
d69b042f3 memcg: add file-b... |
1366 1367 1368 1369 |
/* * Currently used to update mapped file statistics, but the routine can be * generalized to update other statistics as well. */ |
d8046582d memcg: make memcg... |
1370 |
void mem_cgroup_update_file_mapped(struct page *page, int val) |
d69b042f3 memcg: add file-b... |
1371 1372 |
{ struct mem_cgroup *mem; |
d69b042f3 memcg: add file-b... |
1373 |
struct page_cgroup *pc; |
d69b042f3 memcg: add file-b... |
1374 1375 1376 1377 1378 1379 |
pc = lookup_page_cgroup(page); if (unlikely(!pc)) return; lock_page_cgroup(pc); mem = pc->mem_cgroup; |
8725d5416 memcg: fix race i... |
1380 |
if (!mem || !PageCgroupUsed(pc)) |
d69b042f3 memcg: add file-b... |
1381 1382 1383 |
goto done; /* |
c62b1a3b3 memcg: use generi... |
1384 |
* Preemption is already disabled. We can use __this_cpu_xxx |
d69b042f3 memcg: add file-b... |
1385 |
*/ |
8725d5416 memcg: fix race i... |
1386 1387 1388 1389 1390 1391 1392 |
if (val > 0) { __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); SetPageCgroupFileMapped(pc); } else { __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); ClearPageCgroupFileMapped(pc); } |
d69b042f3 memcg: add file-b... |
1393 |
|
d69b042f3 memcg: add file-b... |
1394 1395 1396 |
done: unlock_page_cgroup(pc); } |
0b7f569e4 memcg: fix OOM ki... |
1397 |
|
f817ed485 memcg: move all a... |
1398 |
/* |
cdec2e426 memcg: coalesce c... |
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 |
* size of first charge trial. "32" comes from vmscan.c's magic value. * TODO: maybe necessary to use big numbers in big irons. */ #define CHARGE_SIZE (32 * PAGE_SIZE) struct memcg_stock_pcp { struct mem_cgroup *cached; /* this never be root cgroup */ int charge; struct work_struct work; }; static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); static atomic_t memcg_drain_count; /* * Try to consume stocked charge on this cpu. If success, PAGE_SIZE is consumed * from local stock and true is returned. If the stock is 0 or charges from a * cgroup which is not current target, returns false. This stock will be * refilled. */ static bool consume_stock(struct mem_cgroup *mem) { struct memcg_stock_pcp *stock; bool ret = true; stock = &get_cpu_var(memcg_stock); if (mem == stock->cached && stock->charge) stock->charge -= PAGE_SIZE; else /* need to call res_counter_charge */ ret = false; put_cpu_var(memcg_stock); return ret; } /* * Returns stocks cached in percpu to res_counter and reset cached information. */ static void drain_stock(struct memcg_stock_pcp *stock) { struct mem_cgroup *old = stock->cached; if (stock->charge) { res_counter_uncharge(&old->res, stock->charge); if (do_swap_account) res_counter_uncharge(&old->memsw, stock->charge); } stock->cached = NULL; stock->charge = 0; } /* * This must be called under preempt disabled or must be called by * a thread which is pinned to local cpu. */ static void drain_local_stock(struct work_struct *dummy) { struct memcg_stock_pcp *stock = &__get_cpu_var(memcg_stock); drain_stock(stock); } /* * Cache charges(val) which is from res_counter, to local per_cpu area. |
320cc51d9 mm: fix typo in r... |
1459 |
* This will be consumed by consume_stock() function, later. |
cdec2e426 memcg: coalesce c... |
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 |
*/ static void refill_stock(struct mem_cgroup *mem, int val) { struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock); if (stock->cached != mem) { /* reset if necessary */ drain_stock(stock); stock->cached = mem; } stock->charge += val; put_cpu_var(memcg_stock); } /* * Tries to drain stocked charges in other cpus. This function is asynchronous * and just put a work per cpu for draining localy on each cpu. Caller can * expects some charges will be back to res_counter later but cannot wait for * it. */ static void drain_all_stock_async(void) { int cpu; /* This function is for scheduling "drain" in asynchronous way. * The result of "drain" is not directly handled by callers. Then, * if someone is calling drain, we don't have to call drain more. * Anyway, WORK_STRUCT_PENDING check in queue_work_on() will catch if * there is a race. We just do loose check here. */ if (atomic_read(&memcg_drain_count)) return; /* Notify other cpus that system-wide "drain" is running */ atomic_inc(&memcg_drain_count); get_online_cpus(); for_each_online_cpu(cpu) { struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); schedule_work_on(cpu, &stock->work); } put_online_cpus(); atomic_dec(&memcg_drain_count); /* We don't wait for flush_work */ } /* This is a synchronous drain interface. */ static void drain_all_stock_sync(void) { /* called when force_empty is called */ atomic_inc(&memcg_drain_count); schedule_on_each_cpu(drain_local_stock); atomic_dec(&memcg_drain_count); } static int __cpuinit memcg_stock_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) { int cpu = (unsigned long)hcpu; struct memcg_stock_pcp *stock; if (action != CPU_DEAD) return NOTIFY_OK; stock = &per_cpu(memcg_stock, cpu); drain_stock(stock); return NOTIFY_OK; } /* |
f817ed485 memcg: move all a... |
1526 1527 |
* Unlike exported interface, "oom" parameter is added. if oom==true, * oom-killer can be invoked. |
8a9f3ccd2 Memory controller... |
1528 |
*/ |
f817ed485 memcg: move all a... |
1529 |
static int __mem_cgroup_try_charge(struct mm_struct *mm, |
430e48631 memcg: update thr... |
1530 |
gfp_t gfp_mask, struct mem_cgroup **memcg, bool oom) |
8a9f3ccd2 Memory controller... |
1531 |
{ |
4e649152c memcg: some modif... |
1532 |
struct mem_cgroup *mem, *mem_over_limit; |
7a81b88cb memcg: introduce ... |
1533 |
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
4e649152c memcg: some modif... |
1534 |
struct res_counter *fail_res; |
cdec2e426 memcg: coalesce c... |
1535 |
int csize = CHARGE_SIZE; |
a636b327f memcg: avoid unne... |
1536 |
|
867578cbc memcg: fix oom ki... |
1537 1538 1539 1540 1541 1542 1543 1544 |
/* * Unlike gloval-vm's OOM-kill, we're not in memory shortage * in system level. So, allow to go ahead dying process in addition to * MEMDIE process. */ if (unlikely(test_thread_flag(TIF_MEMDIE) || fatal_signal_pending(current))) goto bypass; |
a636b327f memcg: avoid unne... |
1545 |
|
8a9f3ccd2 Memory controller... |
1546 |
/* |
3be91277e memcgroup: tidy u... |
1547 1548 |
* We always charge the cgroup the mm_struct belongs to. * The mm_struct's mem_cgroup changes on task migration if the |
8a9f3ccd2 Memory controller... |
1549 1550 1551 |
* thread group leader migrates. It's possible that mm is not * set, if so charge the init_mm (happens for pagecache usage). */ |
54595fe26 memcg: use css_tr... |
1552 1553 1554 |
mem = *memcg; if (likely(!mem)) { mem = try_get_mem_cgroup_from_mm(mm); |
7a81b88cb memcg: introduce ... |
1555 |
*memcg = mem; |
e8589cc18 memcg: better mig... |
1556 |
} else { |
7a81b88cb memcg: introduce ... |
1557 |
css_get(&mem->css); |
e8589cc18 memcg: better mig... |
1558 |
} |
54595fe26 memcg: use css_tr... |
1559 1560 |
if (unlikely(!mem)) return 0; |
46f7e602f memcg: fix build ... |
1561 |
VM_BUG_ON(css_is_removed(&mem->css)); |
cdec2e426 memcg: coalesce c... |
1562 1563 |
if (mem_cgroup_is_root(mem)) goto done; |
8a9f3ccd2 Memory controller... |
1564 |
|
8c7c6e34a memcg: mem+swap c... |
1565 |
while (1) { |
0c3e73e84 memcg: improve re... |
1566 |
int ret = 0; |
75822b449 memory controller... |
1567 |
unsigned long flags = 0; |
7a81b88cb memcg: introduce ... |
1568 |
|
cdec2e426 memcg: coalesce c... |
1569 |
if (consume_stock(mem)) |
430e48631 memcg: update thr... |
1570 |
goto done; |
cdec2e426 memcg: coalesce c... |
1571 1572 |
ret = res_counter_charge(&mem->res, csize, &fail_res); |
8c7c6e34a memcg: mem+swap c... |
1573 1574 1575 |
if (likely(!ret)) { if (!do_swap_account) break; |
cdec2e426 memcg: coalesce c... |
1576 |
ret = res_counter_charge(&mem->memsw, csize, &fail_res); |
8c7c6e34a memcg: mem+swap c... |
1577 1578 1579 |
if (likely(!ret)) break; /* mem+swap counter fails */ |
cdec2e426 memcg: coalesce c... |
1580 |
res_counter_uncharge(&mem->res, csize); |
75822b449 memory controller... |
1581 |
flags |= MEM_CGROUP_RECLAIM_NOSWAP; |
6d61ef409 memcg: memory cgr... |
1582 1583 1584 1585 1586 1587 |
mem_over_limit = mem_cgroup_from_res_counter(fail_res, memsw); } else /* mem counter fails */ mem_over_limit = mem_cgroup_from_res_counter(fail_res, res); |
cdec2e426 memcg: coalesce c... |
1588 1589 1590 1591 1592 |
/* reduce request size and retry */ if (csize > PAGE_SIZE) { csize = PAGE_SIZE; continue; } |
3be91277e memcgroup: tidy u... |
1593 |
if (!(gfp_mask & __GFP_WAIT)) |
7a81b88cb memcg: introduce ... |
1594 |
goto nomem; |
e1a1cd590 Memory controller... |
1595 |
|
4e4169535 memory controller... |
1596 1597 |
ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL, gfp_mask, flags); |
4d1c62738 memcg: make oom l... |
1598 1599 |
if (ret) continue; |
66e1707bc Memory controller... |
1600 1601 |
/* |
8869b8f6e memcg: memcontrol... |
1602 1603 1604 1605 1606 |
* try_to_free_mem_cgroup_pages() might not give us a full * picture of reclaim. Some pages are reclaimed and might be * moved to swap cache or just unmapped from the cgroup. * Check the limit again to see if the reclaim reduced the * current usage of the cgroup before giving up |
8c7c6e34a memcg: mem+swap c... |
1607 |
* |
8869b8f6e memcg: memcontrol... |
1608 |
*/ |
b85a96c0b memcg: memory swa... |
1609 1610 |
if (mem_cgroup_check_under_limit(mem_over_limit)) continue; |
3be91277e memcgroup: tidy u... |
1611 |
|
8033b97c9 memcg: avoid oom ... |
1612 1613 1614 1615 1616 1617 1618 1619 |
/* try to avoid oom while someone is moving charge */ if (mc.moving_task && current != mc.moving_task) { struct mem_cgroup *from, *to; bool do_continue = false; /* * There is a small race that "from" or "to" can be * freed by rmdir, so we use css_tryget(). */ |
8033b97c9 memcg: avoid oom ... |
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 |
from = mc.from; to = mc.to; if (from && css_tryget(&from->css)) { if (mem_over_limit->use_hierarchy) do_continue = css_is_ancestor( &from->css, &mem_over_limit->css); else do_continue = (from == mem_over_limit); css_put(&from->css); } if (!do_continue && to && css_tryget(&to->css)) { if (mem_over_limit->use_hierarchy) do_continue = css_is_ancestor( &to->css, &mem_over_limit->css); else do_continue = (to == mem_over_limit); css_put(&to->css); } |
8033b97c9 memcg: avoid oom ... |
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 |
if (do_continue) { DEFINE_WAIT(wait); prepare_to_wait(&mc.waitq, &wait, TASK_INTERRUPTIBLE); /* moving charge context might have finished. */ if (mc.moving_task) schedule(); finish_wait(&mc.waitq, &wait); continue; } } |
3be91277e memcgroup: tidy u... |
1651 |
if (!nr_retries--) { |
867578cbc memcg: fix oom ki... |
1652 1653 1654 1655 1656 |
if (!oom) goto nomem; if (mem_cgroup_handle_oom(mem_over_limit, gfp_mask)) { nr_retries = MEM_CGROUP_RECLAIM_RETRIES; continue; |
a636b327f memcg: avoid unne... |
1657 |
} |
867578cbc memcg: fix oom ki... |
1658 1659 1660 |
/* When we reach here, current task is dying .*/ css_put(&mem->css); goto bypass; |
66e1707bc Memory controller... |
1661 |
} |
8a9f3ccd2 Memory controller... |
1662 |
} |
cdec2e426 memcg: coalesce c... |
1663 1664 |
if (csize > PAGE_SIZE) refill_stock(mem, csize - PAGE_SIZE); |
0c3e73e84 memcg: improve re... |
1665 |
done: |
7a81b88cb memcg: introduce ... |
1666 1667 1668 1669 |
return 0; nomem: css_put(&mem->css); return -ENOMEM; |
867578cbc memcg: fix oom ki... |
1670 1671 1672 |
bypass: *memcg = NULL; return 0; |
7a81b88cb memcg: introduce ... |
1673 |
} |
8a9f3ccd2 Memory controller... |
1674 |
|
a3b2d6926 cgroups: use css ... |
1675 |
/* |
a3032a2c1 memcg: add mem_cg... |
1676 1677 1678 1679 |
* Somemtimes we have to undo a charge we got by try_charge(). * This function is for that and do uncharge, put css's refcnt. * gotten by try_charge(). */ |
854ffa8d1 memcg: improve pe... |
1680 1681 |
static void __mem_cgroup_cancel_charge(struct mem_cgroup *mem, unsigned long count) |
a3032a2c1 memcg: add mem_cg... |
1682 1683 |
{ if (!mem_cgroup_is_root(mem)) { |
854ffa8d1 memcg: improve pe... |
1684 |
res_counter_uncharge(&mem->res, PAGE_SIZE * count); |
a3032a2c1 memcg: add mem_cg... |
1685 |
if (do_swap_account) |
854ffa8d1 memcg: improve pe... |
1686 1687 1688 1689 |
res_counter_uncharge(&mem->memsw, PAGE_SIZE * count); VM_BUG_ON(test_bit(CSS_ROOT, &mem->css.flags)); WARN_ON_ONCE(count > INT_MAX); __css_put(&mem->css, (int)count); |
a3032a2c1 memcg: add mem_cg... |
1690 |
} |
854ffa8d1 memcg: improve pe... |
1691 1692 1693 1694 1695 1696 |
/* we don't need css_put for root */ } static void mem_cgroup_cancel_charge(struct mem_cgroup *mem) { __mem_cgroup_cancel_charge(mem, 1); |
a3032a2c1 memcg: add mem_cg... |
1697 1698 1699 |
} /* |
a3b2d6926 cgroups: use css ... |
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 |
* A helper function to get mem_cgroup from ID. must be called under * rcu_read_lock(). The caller must check css_is_removed() or some if * it's concern. (dropping refcnt from swap can be called against removed * memcg.) */ static struct mem_cgroup *mem_cgroup_lookup(unsigned short id) { struct cgroup_subsys_state *css; /* ID 0 is unused ID */ if (!id) return NULL; css = css_lookup(&mem_cgroup_subsys, id); if (!css) return NULL; return container_of(css, struct mem_cgroup, css); } |
e42d9d5d4 memcg: rename and... |
1717 |
struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
b5a84319a memcg: fix shmem'... |
1718 |
{ |
e42d9d5d4 memcg: rename and... |
1719 |
struct mem_cgroup *mem = NULL; |
3c776e646 memcg: charge swa... |
1720 |
struct page_cgroup *pc; |
a3b2d6926 cgroups: use css ... |
1721 |
unsigned short id; |
b5a84319a memcg: fix shmem'... |
1722 |
swp_entry_t ent; |
3c776e646 memcg: charge swa... |
1723 |
VM_BUG_ON(!PageLocked(page)); |
3c776e646 memcg: charge swa... |
1724 |
pc = lookup_page_cgroup(page); |
c0bd3f63c memcg: fix try_ge... |
1725 |
lock_page_cgroup(pc); |
a3b2d6926 cgroups: use css ... |
1726 |
if (PageCgroupUsed(pc)) { |
3c776e646 memcg: charge swa... |
1727 |
mem = pc->mem_cgroup; |
a3b2d6926 cgroups: use css ... |
1728 1729 |
if (mem && !css_tryget(&mem->css)) mem = NULL; |
e42d9d5d4 memcg: rename and... |
1730 |
} else if (PageSwapCache(page)) { |
3c776e646 memcg: charge swa... |
1731 |
ent.val = page_private(page); |
a3b2d6926 cgroups: use css ... |
1732 1733 1734 1735 1736 1737 |
id = lookup_swap_cgroup(ent); rcu_read_lock(); mem = mem_cgroup_lookup(id); if (mem && !css_tryget(&mem->css)) mem = NULL; rcu_read_unlock(); |
3c776e646 memcg: charge swa... |
1738 |
} |
c0bd3f63c memcg: fix try_ge... |
1739 |
unlock_page_cgroup(pc); |
b5a84319a memcg: fix shmem'... |
1740 1741 |
return mem; } |
7a81b88cb memcg: introduce ... |
1742 |
/* |
a5e924f5f memcg: remove mem... |
1743 |
* commit a charge got by __mem_cgroup_try_charge() and makes page_cgroup to be |
7a81b88cb memcg: introduce ... |
1744 1745 1746 1747 1748 1749 1750 |
* USED state. If already USED, uncharge and return. */ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, struct page_cgroup *pc, enum charge_type ctype) { |
7a81b88cb memcg: introduce ... |
1751 1752 1753 |
/* try_charge() can return NULL to *memcg, taking care of it. */ if (!mem) return; |
52d4b9ac0 memcg: allocate a... |
1754 1755 1756 1757 |
lock_page_cgroup(pc); if (unlikely(PageCgroupUsed(pc))) { unlock_page_cgroup(pc); |
a3032a2c1 memcg: add mem_cg... |
1758 |
mem_cgroup_cancel_charge(mem); |
7a81b88cb memcg: introduce ... |
1759 |
return; |
52d4b9ac0 memcg: allocate a... |
1760 |
} |
4b3bde4c9 memcg: remove the... |
1761 |
|
8a9f3ccd2 Memory controller... |
1762 |
pc->mem_cgroup = mem; |
261fb61a8 memcg: add commen... |
1763 1764 1765 1766 1767 1768 1769 |
/* * We access a page_cgroup asynchronously without lock_page_cgroup(). * Especially when a page_cgroup is taken from a page, pc->mem_cgroup * is accessed after testing USED bit. To make pc->mem_cgroup visible * before USED bit, we need memory barrier here. * See mem_cgroup_add_lru_list(), etc. */ |
08e552c69 memcg: synchroniz... |
1770 |
smp_wmb(); |
4b3bde4c9 memcg: remove the... |
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 |
switch (ctype) { case MEM_CGROUP_CHARGE_TYPE_CACHE: case MEM_CGROUP_CHARGE_TYPE_SHMEM: SetPageCgroupCache(pc); SetPageCgroupUsed(pc); break; case MEM_CGROUP_CHARGE_TYPE_MAPPED: ClearPageCgroupCache(pc); SetPageCgroupUsed(pc); break; default: break; } |
3be91277e memcgroup: tidy u... |
1784 |
|
08e552c69 memcg: synchroniz... |
1785 |
mem_cgroup_charge_statistics(mem, pc, true); |
52d4b9ac0 memcg: allocate a... |
1786 |
|
52d4b9ac0 memcg: allocate a... |
1787 |
unlock_page_cgroup(pc); |
430e48631 memcg: update thr... |
1788 1789 1790 1791 1792 |
/* * "charge_statistics" updated event counter. Then, check it. * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree. * if they exceeds softlimit. */ |
d2265e6fa memcg : share eve... |
1793 |
memcg_check_events(mem, pc->page); |
7a81b88cb memcg: introduce ... |
1794 |
} |
66e1707bc Memory controller... |
1795 |
|
f817ed485 memcg: move all a... |
1796 |
/** |
57f9fd7d2 memcg: cleanup me... |
1797 |
* __mem_cgroup_move_account - move account of the page |
f817ed485 memcg: move all a... |
1798 1799 1800 |
* @pc: page_cgroup of the page. * @from: mem_cgroup which the page is moved from. * @to: mem_cgroup which the page is moved to. @from != @to. |
854ffa8d1 memcg: improve pe... |
1801 |
* @uncharge: whether we should call uncharge and css_put against @from. |
f817ed485 memcg: move all a... |
1802 1803 |
* * The caller must confirm following. |
08e552c69 memcg: synchroniz... |
1804 |
* - page is not on LRU (isolate_page() is useful.) |
57f9fd7d2 memcg: cleanup me... |
1805 |
* - the pc is locked, used, and ->mem_cgroup points to @from. |
f817ed485 memcg: move all a... |
1806 |
* |
854ffa8d1 memcg: improve pe... |
1807 1808 1809 1810 |
* This function doesn't do "charge" nor css_get to new cgroup. It should be * done by a caller(__mem_cgroup_try_charge would be usefull). If @uncharge is * true, this function does "uncharge" from old cgroup, but it doesn't if * @uncharge is false, so a caller should do "uncharge". |
f817ed485 memcg: move all a... |
1811 |
*/ |
57f9fd7d2 memcg: cleanup me... |
1812 |
static void __mem_cgroup_move_account(struct page_cgroup *pc, |
854ffa8d1 memcg: improve pe... |
1813 |
struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge) |
f817ed485 memcg: move all a... |
1814 |
{ |
f817ed485 memcg: move all a... |
1815 |
VM_BUG_ON(from == to); |
08e552c69 memcg: synchroniz... |
1816 |
VM_BUG_ON(PageLRU(pc->page)); |
57f9fd7d2 memcg: cleanup me... |
1817 1818 1819 |
VM_BUG_ON(!PageCgroupLocked(pc)); VM_BUG_ON(!PageCgroupUsed(pc)); VM_BUG_ON(pc->mem_cgroup != from); |
f817ed485 memcg: move all a... |
1820 |
|
8725d5416 memcg: fix race i... |
1821 |
if (PageCgroupFileMapped(pc)) { |
c62b1a3b3 memcg: use generi... |
1822 1823 1824 1825 1826 |
/* Update mapped_file data for mem_cgroup */ preempt_disable(); __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); preempt_enable(); |
d69b042f3 memcg: add file-b... |
1827 |
} |
854ffa8d1 memcg: improve pe... |
1828 1829 1830 1831 |
mem_cgroup_charge_statistics(from, pc, false); if (uncharge) /* This is not "cancel", but cancel_charge does all we need. */ mem_cgroup_cancel_charge(from); |
d69b042f3 memcg: add file-b... |
1832 |
|
854ffa8d1 memcg: improve pe... |
1833 |
/* caller should have done css_get */ |
08e552c69 memcg: synchroniz... |
1834 1835 |
pc->mem_cgroup = to; mem_cgroup_charge_statistics(to, pc, true); |
887032670 cgroup avoid perm... |
1836 1837 1838 |
/* * We charges against "to" which may not have any tasks. Then, "to" * can be under rmdir(). But in current implementation, caller of |
4ffef5fef memcg: move charg... |
1839 1840 1841 |
* this function is just force_empty() and move charge, so it's * garanteed that "to" is never removed. So, we don't check rmdir * status here. |
887032670 cgroup avoid perm... |
1842 |
*/ |
57f9fd7d2 memcg: cleanup me... |
1843 1844 1845 1846 1847 1848 1849 |
} /* * check whether the @pc is valid for moving account and call * __mem_cgroup_move_account() */ static int mem_cgroup_move_account(struct page_cgroup *pc, |
854ffa8d1 memcg: improve pe... |
1850 |
struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge) |
57f9fd7d2 memcg: cleanup me... |
1851 1852 1853 1854 |
{ int ret = -EINVAL; lock_page_cgroup(pc); if (PageCgroupUsed(pc) && pc->mem_cgroup == from) { |
854ffa8d1 memcg: improve pe... |
1855 |
__mem_cgroup_move_account(pc, from, to, uncharge); |
57f9fd7d2 memcg: cleanup me... |
1856 1857 1858 |
ret = 0; } unlock_page_cgroup(pc); |
d2265e6fa memcg : share eve... |
1859 1860 1861 1862 1863 |
/* * check events */ memcg_check_events(to, pc->page); memcg_check_events(from, pc->page); |
f817ed485 memcg: move all a... |
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 |
return ret; } /* * move charges to its parent. */ static int mem_cgroup_move_parent(struct page_cgroup *pc, struct mem_cgroup *child, gfp_t gfp_mask) { |
08e552c69 memcg: synchroniz... |
1875 |
struct page *page = pc->page; |
f817ed485 memcg: move all a... |
1876 1877 1878 |
struct cgroup *cg = child->css.cgroup; struct cgroup *pcg = cg->parent; struct mem_cgroup *parent; |
f817ed485 memcg: move all a... |
1879 1880 1881 1882 1883 |
int ret; /* Is ROOT ? */ if (!pcg) return -EINVAL; |
57f9fd7d2 memcg: cleanup me... |
1884 1885 1886 1887 1888 |
ret = -EBUSY; if (!get_page_unless_zero(page)) goto out; if (isolate_lru_page(page)) goto put; |
08e552c69 memcg: synchroniz... |
1889 |
|
f817ed485 memcg: move all a... |
1890 |
parent = mem_cgroup_from_cont(pcg); |
430e48631 memcg: update thr... |
1891 |
ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false); |
a636b327f memcg: avoid unne... |
1892 |
if (ret || !parent) |
57f9fd7d2 memcg: cleanup me... |
1893 |
goto put_back; |
f817ed485 memcg: move all a... |
1894 |
|
854ffa8d1 memcg: improve pe... |
1895 1896 1897 |
ret = mem_cgroup_move_account(pc, child, parent, true); if (ret) mem_cgroup_cancel_charge(parent); |
57f9fd7d2 memcg: cleanup me... |
1898 |
put_back: |
08e552c69 memcg: synchroniz... |
1899 |
putback_lru_page(page); |
57f9fd7d2 memcg: cleanup me... |
1900 |
put: |
40d58138f memcg: fix error ... |
1901 |
put_page(page); |
57f9fd7d2 memcg: cleanup me... |
1902 |
out: |
f817ed485 memcg: move all a... |
1903 1904 |
return ret; } |
7a81b88cb memcg: introduce ... |
1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 |
/* * Charge the memory controller for page usage. * Return * 0 if the charge was successful * < 0 if the cgroup is over its limit */ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, enum charge_type ctype, struct mem_cgroup *memcg) { struct mem_cgroup *mem; struct page_cgroup *pc; int ret; pc = lookup_page_cgroup(page); /* can happen at boot */ if (unlikely(!pc)) return 0; prefetchw(pc); mem = memcg; |
430e48631 memcg: update thr... |
1926 |
ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true); |
a636b327f memcg: avoid unne... |
1927 |
if (ret || !mem) |
7a81b88cb memcg: introduce ... |
1928 1929 1930 |
return ret; __mem_cgroup_commit_charge(mem, pc, ctype); |
8a9f3ccd2 Memory controller... |
1931 |
return 0; |
8a9f3ccd2 Memory controller... |
1932 |
} |
7a81b88cb memcg: introduce ... |
1933 1934 |
int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask) |
217bc3194 memory cgroup enh... |
1935 |
{ |
f8d665422 memcg: add mem_cg... |
1936 |
if (mem_cgroup_disabled()) |
cede86acd memcg: clean up c... |
1937 |
return 0; |
52d4b9ac0 memcg: allocate a... |
1938 1939 |
if (PageCompound(page)) return 0; |
69029cd55 memcg: remove ref... |
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 |
/* * If already mapped, we don't have to account. * If page cache, page->mapping has address_space. * But page->mapping may have out-of-use anon_vma pointer, * detecit it by PageAnon() check. newly-mapped-anon's page->mapping * is NULL. */ if (page_mapped(page) || (page->mapping && !PageAnon(page))) return 0; if (unlikely(!mm)) mm = &init_mm; |
217bc3194 memory cgroup enh... |
1951 |
return mem_cgroup_charge_common(page, mm, gfp_mask, |
e8589cc18 memcg: better mig... |
1952 |
MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL); |
217bc3194 memory cgroup enh... |
1953 |
} |
83aae4c73 memcg: cleanup ca... |
1954 1955 1956 |
static void __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr, enum charge_type ctype); |
e1a1cd590 Memory controller... |
1957 1958 |
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask) |
8697d3319 Memory controller... |
1959 |
{ |
b5a84319a memcg: fix shmem'... |
1960 1961 |
struct mem_cgroup *mem = NULL; int ret; |
f8d665422 memcg: add mem_cg... |
1962 |
if (mem_cgroup_disabled()) |
cede86acd memcg: clean up c... |
1963 |
return 0; |
52d4b9ac0 memcg: allocate a... |
1964 1965 |
if (PageCompound(page)) return 0; |
accf163e6 memcg: remove a r... |
1966 1967 1968 1969 1970 1971 1972 1973 |
/* * Corner case handling. This is called from add_to_page_cache() * in usual. But some FS (shmem) precharges this page before calling it * and call add_to_page_cache() with GFP_NOWAIT. * * For GFP_NOWAIT case, the page may be pre-charged before calling * add_to_page_cache(). (See shmem.c) check it here and avoid to call * charge twice. (It works but has to pay a bit larger cost.) |
b5a84319a memcg: fix shmem'... |
1974 1975 |
* And when the page is SwapCache, it should take swap information * into account. This is under lock_page() now. |
accf163e6 memcg: remove a r... |
1976 1977 1978 |
*/ if (!(gfp_mask & __GFP_WAIT)) { struct page_cgroup *pc; |
52d4b9ac0 memcg: allocate a... |
1979 1980 1981 1982 1983 1984 1985 |
pc = lookup_page_cgroup(page); if (!pc) return 0; lock_page_cgroup(pc); if (PageCgroupUsed(pc)) { unlock_page_cgroup(pc); |
accf163e6 memcg: remove a r... |
1986 1987 |
return 0; } |
52d4b9ac0 memcg: allocate a... |
1988 |
unlock_page_cgroup(pc); |
accf163e6 memcg: remove a r... |
1989 |
} |
b5a84319a memcg: fix shmem'... |
1990 |
if (unlikely(!mm && !mem)) |
8697d3319 Memory controller... |
1991 |
mm = &init_mm; |
accf163e6 memcg: remove a r... |
1992 |
|
c05555b57 memcg: atomic ops... |
1993 1994 |
if (page_is_file_cache(page)) return mem_cgroup_charge_common(page, mm, gfp_mask, |
e8589cc18 memcg: better mig... |
1995 |
MEM_CGROUP_CHARGE_TYPE_CACHE, NULL); |
b5a84319a memcg: fix shmem'... |
1996 |
|
83aae4c73 memcg: cleanup ca... |
1997 1998 1999 2000 2001 2002 2003 2004 2005 |
/* shmem */ if (PageSwapCache(page)) { ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem); if (!ret) __mem_cgroup_commit_charge_swapin(page, mem, MEM_CGROUP_CHARGE_TYPE_SHMEM); } else ret = mem_cgroup_charge_common(page, mm, gfp_mask, MEM_CGROUP_CHARGE_TYPE_SHMEM, mem); |
b5a84319a memcg: fix shmem'... |
2006 |
|
b5a84319a memcg: fix shmem'... |
2007 |
return ret; |
e8589cc18 memcg: better mig... |
2008 |
} |
54595fe26 memcg: use css_tr... |
2009 2010 2011 |
/* * While swap-in, try_charge -> commit or cancel, the page is locked. * And when try_charge() successfully returns, one refcnt to memcg without |
21ae2956c tree-wide: fix ty... |
2012 |
* struct page_cgroup is acquired. This refcnt will be consumed by |
54595fe26 memcg: use css_tr... |
2013 2014 |
* "commit()" or removed by "cancel()" */ |
8c7c6e34a memcg: mem+swap c... |
2015 2016 2017 2018 2019 |
int mem_cgroup_try_charge_swapin(struct mm_struct *mm, struct page *page, gfp_t mask, struct mem_cgroup **ptr) { struct mem_cgroup *mem; |
54595fe26 memcg: use css_tr... |
2020 |
int ret; |
8c7c6e34a memcg: mem+swap c... |
2021 |
|
f8d665422 memcg: add mem_cg... |
2022 |
if (mem_cgroup_disabled()) |
8c7c6e34a memcg: mem+swap c... |
2023 2024 2025 2026 |
return 0; if (!do_swap_account) goto charge_cur_mm; |
8c7c6e34a memcg: mem+swap c... |
2027 2028 |
/* * A racing thread's fault, or swapoff, may have already updated |
407f9c8b0 ksm: mem cgroup c... |
2029 2030 2031 |
* the pte, and even removed page from swap cache: in those cases * do_swap_page()'s pte_same() test will fail; but there's also a * KSM case which does need to charge the page. |
8c7c6e34a memcg: mem+swap c... |
2032 2033 |
*/ if (!PageSwapCache(page)) |
407f9c8b0 ksm: mem cgroup c... |
2034 |
goto charge_cur_mm; |
e42d9d5d4 memcg: rename and... |
2035 |
mem = try_get_mem_cgroup_from_page(page); |
54595fe26 memcg: use css_tr... |
2036 2037 |
if (!mem) goto charge_cur_mm; |
8c7c6e34a memcg: mem+swap c... |
2038 |
*ptr = mem; |
430e48631 memcg: update thr... |
2039 |
ret = __mem_cgroup_try_charge(NULL, mask, ptr, true); |
54595fe26 memcg: use css_tr... |
2040 2041 2042 |
/* drop extra refcnt from tryget */ css_put(&mem->css); return ret; |
8c7c6e34a memcg: mem+swap c... |
2043 2044 2045 |
charge_cur_mm: if (unlikely(!mm)) mm = &init_mm; |
430e48631 memcg: update thr... |
2046 |
return __mem_cgroup_try_charge(mm, mask, ptr, true); |
8c7c6e34a memcg: mem+swap c... |
2047 |
} |
83aae4c73 memcg: cleanup ca... |
2048 2049 2050 |
static void __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr, enum charge_type ctype) |
7a81b88cb memcg: introduce ... |
2051 2052 |
{ struct page_cgroup *pc; |
f8d665422 memcg: add mem_cg... |
2053 |
if (mem_cgroup_disabled()) |
7a81b88cb memcg: introduce ... |
2054 2055 2056 |
return; if (!ptr) return; |
887032670 cgroup avoid perm... |
2057 |
cgroup_exclude_rmdir(&ptr->css); |
7a81b88cb memcg: introduce ... |
2058 |
pc = lookup_page_cgroup(page); |
544122e5e memcg: fix LRU ac... |
2059 |
mem_cgroup_lru_del_before_commit_swapcache(page); |
83aae4c73 memcg: cleanup ca... |
2060 |
__mem_cgroup_commit_charge(ptr, pc, ctype); |
544122e5e memcg: fix LRU ac... |
2061 |
mem_cgroup_lru_add_after_commit_swapcache(page); |
8c7c6e34a memcg: mem+swap c... |
2062 2063 2064 |
/* * Now swap is on-memory. This means this page may be * counted both as mem and swap....double count. |
03f3c4336 memcg: fix swap a... |
2065 2066 2067 |
* Fix it by uncharging from memsw. Basically, this SwapCache is stable * under lock_page(). But in do_swap_page()::memory.c, reuse_swap_page() * may call delete_from_swap_cache() before reach here. |
8c7c6e34a memcg: mem+swap c... |
2068 |
*/ |
03f3c4336 memcg: fix swap a... |
2069 |
if (do_swap_account && PageSwapCache(page)) { |
8c7c6e34a memcg: mem+swap c... |
2070 |
swp_entry_t ent = {.val = page_private(page)}; |
a3b2d6926 cgroups: use css ... |
2071 |
unsigned short id; |
8c7c6e34a memcg: mem+swap c... |
2072 |
struct mem_cgroup *memcg; |
a3b2d6926 cgroups: use css ... |
2073 2074 2075 2076 |
id = swap_cgroup_record(ent, 0); rcu_read_lock(); memcg = mem_cgroup_lookup(id); |
8c7c6e34a memcg: mem+swap c... |
2077 |
if (memcg) { |
a3b2d6926 cgroups: use css ... |
2078 2079 2080 2081 |
/* * This recorded memcg can be obsolete one. So, avoid * calling css_tryget */ |
0c3e73e84 memcg: improve re... |
2082 |
if (!mem_cgroup_is_root(memcg)) |
4e649152c memcg: some modif... |
2083 |
res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
0c3e73e84 memcg: improve re... |
2084 |
mem_cgroup_swap_statistics(memcg, false); |
8c7c6e34a memcg: mem+swap c... |
2085 2086 |
mem_cgroup_put(memcg); } |
a3b2d6926 cgroups: use css ... |
2087 |
rcu_read_unlock(); |
8c7c6e34a memcg: mem+swap c... |
2088 |
} |
887032670 cgroup avoid perm... |
2089 2090 2091 2092 2093 2094 |
/* * At swapin, we may charge account against cgroup which has no tasks. * So, rmdir()->pre_destroy() can be called while we do this charge. * In that case, we need to call pre_destroy() again. check it here. */ cgroup_release_and_wakeup_rmdir(&ptr->css); |
7a81b88cb memcg: introduce ... |
2095 |
} |
83aae4c73 memcg: cleanup ca... |
2096 2097 2098 2099 2100 |
void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr) { __mem_cgroup_commit_charge_swapin(page, ptr, MEM_CGROUP_CHARGE_TYPE_MAPPED); } |
7a81b88cb memcg: introduce ... |
2101 2102 |
void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem) { |
f8d665422 memcg: add mem_cg... |
2103 |
if (mem_cgroup_disabled()) |
7a81b88cb memcg: introduce ... |
2104 2105 2106 |
return; if (!mem) return; |
a3032a2c1 memcg: add mem_cg... |
2107 |
mem_cgroup_cancel_charge(mem); |
7a81b88cb memcg: introduce ... |
2108 |
} |
569b846df memcg: coalesce u... |
2109 2110 2111 2112 2113 2114 2115 2116 |
static void __do_uncharge(struct mem_cgroup *mem, const enum charge_type ctype) { struct memcg_batch_info *batch = NULL; bool uncharge_memsw = true; /* If swapout, usage of swap doesn't decrease */ if (!do_swap_account || ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) uncharge_memsw = false; |
569b846df memcg: coalesce u... |
2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 |
batch = ¤t->memcg_batch; /* * In usual, we do css_get() when we remember memcg pointer. * But in this case, we keep res->usage until end of a series of * uncharges. Then, it's ok to ignore memcg's refcnt. */ if (!batch->memcg) batch->memcg = mem; /* |
3c11ecf44 memcg: oom kill d... |
2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 |
* do_batch > 0 when unmapping pages or inode invalidate/truncate. * In those cases, all pages freed continously can be expected to be in * the same cgroup and we have chance to coalesce uncharges. * But we do uncharge one by one if this is killed by OOM(TIF_MEMDIE) * because we want to do uncharge as soon as possible. */ if (!batch->do_batch || test_thread_flag(TIF_MEMDIE)) goto direct_uncharge; /* |
569b846df memcg: coalesce u... |
2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 |
* In typical case, batch->memcg == mem. This means we can * merge a series of uncharges to an uncharge of res_counter. * If not, we uncharge res_counter ony by one. */ if (batch->memcg != mem) goto direct_uncharge; /* remember freed charge and uncharge it later */ batch->bytes += PAGE_SIZE; if (uncharge_memsw) batch->memsw_bytes += PAGE_SIZE; return; direct_uncharge: res_counter_uncharge(&mem->res, PAGE_SIZE); if (uncharge_memsw) res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
3c11ecf44 memcg: oom kill d... |
2153 2154 |
if (unlikely(batch->memcg != mem)) memcg_oom_recover(mem); |
569b846df memcg: coalesce u... |
2155 2156 |
return; } |
7a81b88cb memcg: introduce ... |
2157 |
|
8697d3319 Memory controller... |
2158 |
/* |
69029cd55 memcg: remove ref... |
2159 |
* uncharge if !page_mapped(page) |
8a9f3ccd2 Memory controller... |
2160 |
*/ |
8c7c6e34a memcg: mem+swap c... |
2161 |
static struct mem_cgroup * |
69029cd55 memcg: remove ref... |
2162 |
__mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype) |
8a9f3ccd2 Memory controller... |
2163 |
{ |
8289546e5 memcg: remove mem... |
2164 |
struct page_cgroup *pc; |
8c7c6e34a memcg: mem+swap c... |
2165 |
struct mem_cgroup *mem = NULL; |
072c56c13 per-zone and recl... |
2166 |
struct mem_cgroup_per_zone *mz; |
8a9f3ccd2 Memory controller... |
2167 |
|
f8d665422 memcg: add mem_cg... |
2168 |
if (mem_cgroup_disabled()) |
8c7c6e34a memcg: mem+swap c... |
2169 |
return NULL; |
4077960e2 memory controller... |
2170 |
|
d13d14430 memcg: handle swa... |
2171 |
if (PageSwapCache(page)) |
8c7c6e34a memcg: mem+swap c... |
2172 |
return NULL; |
d13d14430 memcg: handle swa... |
2173 |
|
8697d3319 Memory controller... |
2174 |
/* |
3c541e14b Memory controller... |
2175 |
* Check if our page_cgroup is valid |
8697d3319 Memory controller... |
2176 |
*/ |
52d4b9ac0 memcg: allocate a... |
2177 2178 |
pc = lookup_page_cgroup(page); if (unlikely(!pc || !PageCgroupUsed(pc))) |
8c7c6e34a memcg: mem+swap c... |
2179 |
return NULL; |
b9c565d5a memcg: remove cle... |
2180 |
|
52d4b9ac0 memcg: allocate a... |
2181 |
lock_page_cgroup(pc); |
d13d14430 memcg: handle swa... |
2182 |
|
8c7c6e34a memcg: mem+swap c... |
2183 |
mem = pc->mem_cgroup; |
d13d14430 memcg: handle swa... |
2184 2185 2186 2187 2188 |
if (!PageCgroupUsed(pc)) goto unlock_out; switch (ctype) { case MEM_CGROUP_CHARGE_TYPE_MAPPED: |
8a9478ca7 memcg: fix swap a... |
2189 |
case MEM_CGROUP_CHARGE_TYPE_DROP: |
ac39cf8cb memcg: fix mis-ac... |
2190 2191 |
/* See mem_cgroup_prepare_migration() */ if (page_mapped(page) || PageCgroupMigration(pc)) |
d13d14430 memcg: handle swa... |
2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 |
goto unlock_out; break; case MEM_CGROUP_CHARGE_TYPE_SWAPOUT: if (!PageAnon(page)) { /* Shared memory */ if (page->mapping && !page_is_file_cache(page)) goto unlock_out; } else if (page_mapped(page)) /* Anon */ goto unlock_out; break; default: break; |
52d4b9ac0 memcg: allocate a... |
2203 |
} |
d13d14430 memcg: handle swa... |
2204 |
|
569b846df memcg: coalesce u... |
2205 2206 |
if (!mem_cgroup_is_root(mem)) __do_uncharge(mem, ctype); |
0c3e73e84 memcg: improve re... |
2207 2208 |
if (ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) mem_cgroup_swap_statistics(mem, true); |
08e552c69 memcg: synchroniz... |
2209 |
mem_cgroup_charge_statistics(mem, pc, false); |
04046e1a0 memcg: use CSS ID |
2210 |
|
52d4b9ac0 memcg: allocate a... |
2211 |
ClearPageCgroupUsed(pc); |
544122e5e memcg: fix LRU ac... |
2212 2213 2214 2215 2216 2217 |
/* * pc->mem_cgroup is not cleared here. It will be accessed when it's * freed from LRU. This is safe because uncharged page is expected not * to be reused (freed soon). Exception is SwapCache, it's handled by * special functions. */ |
b9c565d5a memcg: remove cle... |
2218 |
|
69029cd55 memcg: remove ref... |
2219 |
mz = page_cgroup_zoneinfo(pc); |
52d4b9ac0 memcg: allocate a... |
2220 |
unlock_page_cgroup(pc); |
fb59e9f1e memcg: fix oops o... |
2221 |
|
d2265e6fa memcg : share eve... |
2222 |
memcg_check_events(mem, page); |
a7fe942e9 memcg: swapout re... |
2223 2224 2225 |
/* at swapout, this memcg will be accessed to record to swap */ if (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT) css_put(&mem->css); |
6d12e2d8d per-zone and recl... |
2226 |
|
8c7c6e34a memcg: mem+swap c... |
2227 |
return mem; |
d13d14430 memcg: handle swa... |
2228 2229 2230 |
unlock_out: unlock_page_cgroup(pc); |
8c7c6e34a memcg: mem+swap c... |
2231 |
return NULL; |
3c541e14b Memory controller... |
2232 |
} |
69029cd55 memcg: remove ref... |
2233 2234 |
void mem_cgroup_uncharge_page(struct page *page) { |
52d4b9ac0 memcg: allocate a... |
2235 2236 2237 2238 2239 |
/* early check. */ if (page_mapped(page)) return; if (page->mapping && !PageAnon(page)) return; |
69029cd55 memcg: remove ref... |
2240 2241 2242 2243 2244 2245 |
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED); } void mem_cgroup_uncharge_cache_page(struct page *page) { VM_BUG_ON(page_mapped(page)); |
b7abea963 memcg: make page-... |
2246 |
VM_BUG_ON(page->mapping); |
69029cd55 memcg: remove ref... |
2247 2248 |
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); } |
569b846df memcg: coalesce u... |
2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 |
/* * Batch_start/batch_end is called in unmap_page_range/invlidate/trucate. * In that cases, pages are freed continuously and we can expect pages * are in the same memcg. All these calls itself limits the number of * pages freed at once, then uncharge_start/end() is called properly. * This may be called prural(2) times in a context, */ void mem_cgroup_uncharge_start(void) { current->memcg_batch.do_batch++; /* We can do nest. */ if (current->memcg_batch.do_batch == 1) { current->memcg_batch.memcg = NULL; current->memcg_batch.bytes = 0; current->memcg_batch.memsw_bytes = 0; } } void mem_cgroup_uncharge_end(void) { struct memcg_batch_info *batch = ¤t->memcg_batch; if (!batch->do_batch) return; batch->do_batch--; if (batch->do_batch) /* If stacked, do nothing. */ return; if (!batch->memcg) return; /* * This "batch->memcg" is valid without any css_get/put etc... * bacause we hide charges behind us. */ if (batch->bytes) res_counter_uncharge(&batch->memcg->res, batch->bytes); if (batch->memsw_bytes) res_counter_uncharge(&batch->memcg->memsw, batch->memsw_bytes); |
3c11ecf44 memcg: oom kill d... |
2289 |
memcg_oom_recover(batch->memcg); |
569b846df memcg: coalesce u... |
2290 2291 2292 |
/* forget this pointer (for sanity check) */ batch->memcg = NULL; } |
e767e0561 memcg: fix deadlo... |
2293 |
#ifdef CONFIG_SWAP |
8c7c6e34a memcg: mem+swap c... |
2294 |
/* |
e767e0561 memcg: fix deadlo... |
2295 |
* called after __delete_from_swap_cache() and drop "page" account. |
8c7c6e34a memcg: mem+swap c... |
2296 2297 |
* memcg information is recorded to swap_cgroup of "ent" */ |
8a9478ca7 memcg: fix swap a... |
2298 2299 |
void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout) |
8c7c6e34a memcg: mem+swap c... |
2300 2301 |
{ struct mem_cgroup *memcg; |
8a9478ca7 memcg: fix swap a... |
2302 2303 2304 2305 2306 2307 |
int ctype = MEM_CGROUP_CHARGE_TYPE_SWAPOUT; if (!swapout) /* this was a swap cache but the swap is unused ! */ ctype = MEM_CGROUP_CHARGE_TYPE_DROP; memcg = __mem_cgroup_uncharge_common(page, ctype); |
8c7c6e34a memcg: mem+swap c... |
2308 |
|
8c7c6e34a memcg: mem+swap c... |
2309 |
/* record memcg information */ |
8a9478ca7 memcg: fix swap a... |
2310 |
if (do_swap_account && swapout && memcg) { |
a3b2d6926 cgroups: use css ... |
2311 |
swap_cgroup_record(ent, css_id(&memcg->css)); |
8c7c6e34a memcg: mem+swap c... |
2312 2313 |
mem_cgroup_get(memcg); } |
8a9478ca7 memcg: fix swap a... |
2314 |
if (swapout && memcg) |
a7fe942e9 memcg: swapout re... |
2315 |
css_put(&memcg->css); |
8c7c6e34a memcg: mem+swap c... |
2316 |
} |
e767e0561 memcg: fix deadlo... |
2317 |
#endif |
8c7c6e34a memcg: mem+swap c... |
2318 2319 2320 2321 2322 2323 2324 |
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP /* * called from swap_entry_free(). remove record in swap_cgroup and * uncharge "memsw" account. */ void mem_cgroup_uncharge_swap(swp_entry_t ent) |
d13d14430 memcg: handle swa... |
2325 |
{ |
8c7c6e34a memcg: mem+swap c... |
2326 |
struct mem_cgroup *memcg; |
a3b2d6926 cgroups: use css ... |
2327 |
unsigned short id; |
8c7c6e34a memcg: mem+swap c... |
2328 2329 2330 |
if (!do_swap_account) return; |
a3b2d6926 cgroups: use css ... |
2331 2332 2333 |
id = swap_cgroup_record(ent, 0); rcu_read_lock(); memcg = mem_cgroup_lookup(id); |
8c7c6e34a memcg: mem+swap c... |
2334 |
if (memcg) { |
a3b2d6926 cgroups: use css ... |
2335 2336 2337 2338 |
/* * We uncharge this because swap is freed. * This memcg can be obsolete one. We avoid calling css_tryget */ |
0c3e73e84 memcg: improve re... |
2339 |
if (!mem_cgroup_is_root(memcg)) |
4e649152c memcg: some modif... |
2340 |
res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
0c3e73e84 memcg: improve re... |
2341 |
mem_cgroup_swap_statistics(memcg, false); |
8c7c6e34a memcg: mem+swap c... |
2342 2343 |
mem_cgroup_put(memcg); } |
a3b2d6926 cgroups: use css ... |
2344 |
rcu_read_unlock(); |
d13d14430 memcg: handle swa... |
2345 |
} |
024914477 memcg: move charg... |
2346 2347 2348 2349 2350 2351 |
/** * mem_cgroup_move_swap_account - move swap charge and swap_cgroup's record. * @entry: swap entry to be moved * @from: mem_cgroup which the entry is moved from * @to: mem_cgroup which the entry is moved to |
483c30b51 memcg: improve pe... |
2352 |
* @need_fixup: whether we should fixup res_counters and refcounts. |
024914477 memcg: move charg... |
2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 |
* * It succeeds only when the swap_cgroup's record for this entry is the same * as the mem_cgroup's id of @from. * * Returns 0 on success, -EINVAL on failure. * * The caller must have charged to @to, IOW, called res_counter_charge() about * both res and memsw, and called css_get(). */ static int mem_cgroup_move_swap_account(swp_entry_t entry, |
483c30b51 memcg: improve pe... |
2363 |
struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) |
024914477 memcg: move charg... |
2364 2365 2366 2367 2368 2369 2370 |
{ unsigned short old_id, new_id; old_id = css_id(&from->css); new_id = css_id(&to->css); if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) { |
024914477 memcg: move charg... |
2371 |
mem_cgroup_swap_statistics(from, false); |
483c30b51 memcg: improve pe... |
2372 |
mem_cgroup_swap_statistics(to, true); |
024914477 memcg: move charg... |
2373 |
/* |
483c30b51 memcg: improve pe... |
2374 2375 2376 2377 2378 2379 |
* This function is only called from task migration context now. * It postpones res_counter and refcount handling till the end * of task migration(mem_cgroup_clear_mc()) for performance * improvement. But we cannot postpone mem_cgroup_get(to) * because if the process that has been moved to @to does * swap-in, the refcount of @to might be decreased to 0. |
024914477 memcg: move charg... |
2380 |
*/ |
024914477 memcg: move charg... |
2381 |
mem_cgroup_get(to); |
483c30b51 memcg: improve pe... |
2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 |
if (need_fixup) { if (!mem_cgroup_is_root(from)) res_counter_uncharge(&from->memsw, PAGE_SIZE); mem_cgroup_put(from); /* * we charged both to->res and to->memsw, so we should * uncharge to->res. */ if (!mem_cgroup_is_root(to)) res_counter_uncharge(&to->res, PAGE_SIZE); css_put(&to->css); } |
024914477 memcg: move charg... |
2394 2395 2396 2397 2398 2399 |
return 0; } return -EINVAL; } #else static inline int mem_cgroup_move_swap_account(swp_entry_t entry, |
483c30b51 memcg: improve pe... |
2400 |
struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) |
024914477 memcg: move charg... |
2401 2402 2403 |
{ return -EINVAL; } |
8c7c6e34a memcg: mem+swap c... |
2404 |
#endif |
d13d14430 memcg: handle swa... |
2405 |
|
ae41be374 bugfix for memory... |
2406 |
/* |
01b1ae63c memcg: simple mig... |
2407 2408 |
* Before starting migration, account PAGE_SIZE to mem_cgroup that the old * page belongs to. |
ae41be374 bugfix for memory... |
2409 |
*/ |
ac39cf8cb memcg: fix mis-ac... |
2410 2411 |
int mem_cgroup_prepare_migration(struct page *page, struct page *newpage, struct mem_cgroup **ptr) |
ae41be374 bugfix for memory... |
2412 2413 |
{ struct page_cgroup *pc; |
e8589cc18 memcg: better mig... |
2414 |
struct mem_cgroup *mem = NULL; |
ac39cf8cb memcg: fix mis-ac... |
2415 |
enum charge_type ctype; |
e8589cc18 memcg: better mig... |
2416 |
int ret = 0; |
8869b8f6e memcg: memcontrol... |
2417 |
|
f8d665422 memcg: add mem_cg... |
2418 |
if (mem_cgroup_disabled()) |
4077960e2 memory controller... |
2419 |
return 0; |
52d4b9ac0 memcg: allocate a... |
2420 2421 2422 |
pc = lookup_page_cgroup(page); lock_page_cgroup(pc); if (PageCgroupUsed(pc)) { |
e8589cc18 memcg: better mig... |
2423 2424 |
mem = pc->mem_cgroup; css_get(&mem->css); |
ac39cf8cb memcg: fix mis-ac... |
2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 |
/* * At migrating an anonymous page, its mapcount goes down * to 0 and uncharge() will be called. But, even if it's fully * unmapped, migration may fail and this page has to be * charged again. We set MIGRATION flag here and delay uncharge * until end_migration() is called * * Corner Case Thinking * A) * When the old page was mapped as Anon and it's unmap-and-freed * while migration was ongoing. * If unmap finds the old page, uncharge() of it will be delayed * until end_migration(). If unmap finds a new page, it's * uncharged when it make mapcount to be 1->0. If unmap code * finds swap_migration_entry, the new page will not be mapped * and end_migration() will find it(mapcount==0). * * B) * When the old page was mapped but migraion fails, the kernel * remaps it. A charge for it is kept by MIGRATION flag even * if mapcount goes down to 0. We can do remap successfully * without charging it again. * * C) * The "old" page is under lock_page() until the end of * migration, so, the old page itself will not be swapped-out. * If the new page is swapped out before end_migraton, our * hook to usual swap-out path will catch the event. */ if (PageAnon(page)) SetPageCgroupMigration(pc); |
e8589cc18 memcg: better mig... |
2456 |
} |
52d4b9ac0 memcg: allocate a... |
2457 |
unlock_page_cgroup(pc); |
ac39cf8cb memcg: fix mis-ac... |
2458 2459 2460 2461 2462 2463 |
/* * If the page is not charged at this point, * we return here. */ if (!mem) return 0; |
01b1ae63c memcg: simple mig... |
2464 |
|
93d5c9be1 memcg: fix prepar... |
2465 |
*ptr = mem; |
ac39cf8cb memcg: fix mis-ac... |
2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 |
ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, ptr, false); css_put(&mem->css);/* drop extra refcnt */ if (ret || *ptr == NULL) { if (PageAnon(page)) { lock_page_cgroup(pc); ClearPageCgroupMigration(pc); unlock_page_cgroup(pc); /* * The old page may be fully unmapped while we kept it. */ mem_cgroup_uncharge_page(page); } return -ENOMEM; |
e8589cc18 memcg: better mig... |
2479 |
} |
ac39cf8cb memcg: fix mis-ac... |
2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 |
/* * We charge new page before it's used/mapped. So, even if unlock_page() * is called before end_migration, we can catch all events on this new * page. In the case new page is migrated but not remapped, new page's * mapcount will be finally 0 and we call uncharge in end_migration(). */ pc = lookup_page_cgroup(newpage); if (PageAnon(page)) ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED; else if (page_is_file_cache(page)) ctype = MEM_CGROUP_CHARGE_TYPE_CACHE; else ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM; __mem_cgroup_commit_charge(mem, pc, ctype); |
e8589cc18 memcg: better mig... |
2494 |
return ret; |
ae41be374 bugfix for memory... |
2495 |
} |
8869b8f6e memcg: memcontrol... |
2496 |
|
69029cd55 memcg: remove ref... |
2497 |
/* remove redundant charge if migration failed*/ |
01b1ae63c memcg: simple mig... |
2498 |
void mem_cgroup_end_migration(struct mem_cgroup *mem, |
ac39cf8cb memcg: fix mis-ac... |
2499 |
struct page *oldpage, struct page *newpage) |
ae41be374 bugfix for memory... |
2500 |
{ |
ac39cf8cb memcg: fix mis-ac... |
2501 |
struct page *used, *unused; |
01b1ae63c memcg: simple mig... |
2502 |
struct page_cgroup *pc; |
01b1ae63c memcg: simple mig... |
2503 2504 2505 |
if (!mem) return; |
ac39cf8cb memcg: fix mis-ac... |
2506 |
/* blocks rmdir() */ |
887032670 cgroup avoid perm... |
2507 |
cgroup_exclude_rmdir(&mem->css); |
01b1ae63c memcg: simple mig... |
2508 2509 |
/* at migration success, oldpage->mapping is NULL. */ if (oldpage->mapping) { |
ac39cf8cb memcg: fix mis-ac... |
2510 2511 |
used = oldpage; unused = newpage; |
01b1ae63c memcg: simple mig... |
2512 |
} else { |
ac39cf8cb memcg: fix mis-ac... |
2513 |
used = newpage; |
01b1ae63c memcg: simple mig... |
2514 2515 |
unused = oldpage; } |
69029cd55 memcg: remove ref... |
2516 |
/* |
ac39cf8cb memcg: fix mis-ac... |
2517 2518 2519 |
* We disallowed uncharge of pages under migration because mapcount * of the page goes down to zero, temporarly. * Clear the flag and check the page should be charged. |
01b1ae63c memcg: simple mig... |
2520 |
*/ |
ac39cf8cb memcg: fix mis-ac... |
2521 2522 2523 2524 |
pc = lookup_page_cgroup(oldpage); lock_page_cgroup(pc); ClearPageCgroupMigration(pc); unlock_page_cgroup(pc); |
01b1ae63c memcg: simple mig... |
2525 |
|
ac39cf8cb memcg: fix mis-ac... |
2526 2527 2528 2529 2530 |
if (unused != oldpage) pc = lookup_page_cgroup(unused); __mem_cgroup_uncharge_common(unused, MEM_CGROUP_CHARGE_TYPE_FORCE); pc = lookup_page_cgroup(used); |
01b1ae63c memcg: simple mig... |
2531 |
/* |
ac39cf8cb memcg: fix mis-ac... |
2532 2533 2534 2535 2536 2537 |
* If a page is a file cache, radix-tree replacement is very atomic * and we can skip this check. When it was an Anon page, its mapcount * goes down to 0. But because we added MIGRATION flage, it's not * uncharged yet. There are several case but page->mapcount check * and USED bit check in mem_cgroup_uncharge_page() will do enough * check. (see prepare_charge() also) |
69029cd55 memcg: remove ref... |
2538 |
*/ |
ac39cf8cb memcg: fix mis-ac... |
2539 2540 |
if (PageAnon(used)) mem_cgroup_uncharge_page(used); |
887032670 cgroup avoid perm... |
2541 |
/* |
ac39cf8cb memcg: fix mis-ac... |
2542 2543 |
* At migration, we may charge account against cgroup which has no * tasks. |
887032670 cgroup avoid perm... |
2544 2545 2546 2547 |
* So, rmdir()->pre_destroy() can be called while we do this charge. * In that case, we need to call pre_destroy() again. check it here. */ cgroup_release_and_wakeup_rmdir(&mem->css); |
ae41be374 bugfix for memory... |
2548 |
} |
78fb74669 Memory controller... |
2549 |
|
cc8475822 memory cgroup enh... |
2550 |
/* |
ae3abae64 memcg: fix mem_cg... |
2551 2552 2553 2554 2555 2556 |
* A call to try to shrink memory usage on charge failure at shmem's swapin. * Calling hierarchical_reclaim is not enough because we should update * last_oom_jiffies to prevent pagefault_out_of_memory from invoking global OOM. * Moreover considering hierarchy, we should reclaim from the mem_over_limit, * not from the memcg which this page would be charged to. * try_charge_swapin does all of these works properly. |
c9b0ed514 memcg: helper fun... |
2557 |
*/ |
ae3abae64 memcg: fix mem_cg... |
2558 |
int mem_cgroup_shmem_charge_fallback(struct page *page, |
b5a84319a memcg: fix shmem'... |
2559 2560 |
struct mm_struct *mm, gfp_t gfp_mask) |
c9b0ed514 memcg: helper fun... |
2561 |
{ |
b5a84319a memcg: fix shmem'... |
2562 |
struct mem_cgroup *mem = NULL; |
ae3abae64 memcg: fix mem_cg... |
2563 |
int ret; |
c9b0ed514 memcg: helper fun... |
2564 |
|
f8d665422 memcg: add mem_cg... |
2565 |
if (mem_cgroup_disabled()) |
cede86acd memcg: clean up c... |
2566 |
return 0; |
c9b0ed514 memcg: helper fun... |
2567 |
|
ae3abae64 memcg: fix mem_cg... |
2568 2569 2570 |
ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem); if (!ret) mem_cgroup_cancel_charge_swapin(mem); /* it does !mem check */ |
c9b0ed514 memcg: helper fun... |
2571 |
|
ae3abae64 memcg: fix mem_cg... |
2572 |
return ret; |
c9b0ed514 memcg: helper fun... |
2573 |
} |
8c7c6e34a memcg: mem+swap c... |
2574 |
static DEFINE_MUTEX(set_limit_mutex); |
d38d2a758 mm: make mem_cgro... |
2575 |
static int mem_cgroup_resize_limit(struct mem_cgroup *memcg, |
8c7c6e34a memcg: mem+swap c... |
2576 |
unsigned long long val) |
628f42355 memcg: limit chan... |
2577 |
{ |
81d39c20f memcg: fix shrink... |
2578 |
int retry_count; |
3c11ecf44 memcg: oom kill d... |
2579 |
u64 memswlimit, memlimit; |
628f42355 memcg: limit chan... |
2580 |
int ret = 0; |
81d39c20f memcg: fix shrink... |
2581 2582 |
int children = mem_cgroup_count_children(memcg); u64 curusage, oldusage; |
3c11ecf44 memcg: oom kill d... |
2583 |
int enlarge; |
81d39c20f memcg: fix shrink... |
2584 2585 2586 2587 2588 2589 2590 2591 2592 |
/* * For keeping hierarchical_reclaim simple, how long we should retry * is depends on callers. We set our retry-count to be function * of # of children which we should visit in this loop. */ retry_count = MEM_CGROUP_RECLAIM_RETRIES * children; oldusage = res_counter_read_u64(&memcg->res, RES_USAGE); |
628f42355 memcg: limit chan... |
2593 |
|
3c11ecf44 memcg: oom kill d... |
2594 |
enlarge = 0; |
8c7c6e34a memcg: mem+swap c... |
2595 |
while (retry_count) { |
628f42355 memcg: limit chan... |
2596 2597 2598 2599 |
if (signal_pending(current)) { ret = -EINTR; break; } |
8c7c6e34a memcg: mem+swap c... |
2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 |
/* * Rather than hide all in some function, I do this in * open coded manner. You see what this really does. * We have to guarantee mem->res.limit < mem->memsw.limit. */ mutex_lock(&set_limit_mutex); memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); if (memswlimit < val) { ret = -EINVAL; mutex_unlock(&set_limit_mutex); |
628f42355 memcg: limit chan... |
2610 2611 |
break; } |
3c11ecf44 memcg: oom kill d... |
2612 2613 2614 2615 |
memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); if (memlimit < val) enlarge = 1; |
8c7c6e34a memcg: mem+swap c... |
2616 |
ret = res_counter_set_limit(&memcg->res, val); |
22a668d7c memcg: fix behavi... |
2617 2618 2619 2620 2621 2622 |
if (!ret) { if (memswlimit == val) memcg->memsw_is_minimum = true; else memcg->memsw_is_minimum = false; } |
8c7c6e34a memcg: mem+swap c... |
2623 2624 2625 2626 |
mutex_unlock(&set_limit_mutex); if (!ret) break; |
aa20d489c memcg: code clean... |
2627 |
mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL, |
4e4169535 memory controller... |
2628 |
MEM_CGROUP_RECLAIM_SHRINK); |
81d39c20f memcg: fix shrink... |
2629 2630 2631 2632 2633 2634 |
curusage = res_counter_read_u64(&memcg->res, RES_USAGE); /* Usage is reduced ? */ if (curusage >= oldusage) retry_count--; else oldusage = curusage; |
8c7c6e34a memcg: mem+swap c... |
2635 |
} |
3c11ecf44 memcg: oom kill d... |
2636 2637 |
if (!ret && enlarge) memcg_oom_recover(memcg); |
14797e236 memcg: add inacti... |
2638 |
|
8c7c6e34a memcg: mem+swap c... |
2639 2640 |
return ret; } |
338c84310 memcg: remove som... |
2641 2642 |
static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, unsigned long long val) |
8c7c6e34a memcg: mem+swap c... |
2643 |
{ |
81d39c20f memcg: fix shrink... |
2644 |
int retry_count; |
3c11ecf44 memcg: oom kill d... |
2645 |
u64 memlimit, memswlimit, oldusage, curusage; |
81d39c20f memcg: fix shrink... |
2646 2647 |
int children = mem_cgroup_count_children(memcg); int ret = -EBUSY; |
3c11ecf44 memcg: oom kill d... |
2648 |
int enlarge = 0; |
8c7c6e34a memcg: mem+swap c... |
2649 |
|
81d39c20f memcg: fix shrink... |
2650 2651 2652 |
/* see mem_cgroup_resize_res_limit */ retry_count = children * MEM_CGROUP_RECLAIM_RETRIES; oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
8c7c6e34a memcg: mem+swap c... |
2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 |
while (retry_count) { if (signal_pending(current)) { ret = -EINTR; break; } /* * Rather than hide all in some function, I do this in * open coded manner. You see what this really does. * We have to guarantee mem->res.limit < mem->memsw.limit. */ mutex_lock(&set_limit_mutex); memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); if (memlimit > val) { ret = -EINVAL; mutex_unlock(&set_limit_mutex); break; } |
3c11ecf44 memcg: oom kill d... |
2670 2671 2672 |
memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); if (memswlimit < val) enlarge = 1; |
8c7c6e34a memcg: mem+swap c... |
2673 |
ret = res_counter_set_limit(&memcg->memsw, val); |
22a668d7c memcg: fix behavi... |
2674 2675 2676 2677 2678 2679 |
if (!ret) { if (memlimit == val) memcg->memsw_is_minimum = true; else memcg->memsw_is_minimum = false; } |
8c7c6e34a memcg: mem+swap c... |
2680 2681 2682 2683 |
mutex_unlock(&set_limit_mutex); if (!ret) break; |
4e4169535 memory controller... |
2684 |
mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL, |
75822b449 memory controller... |
2685 2686 |
MEM_CGROUP_RECLAIM_NOSWAP | MEM_CGROUP_RECLAIM_SHRINK); |
8c7c6e34a memcg: mem+swap c... |
2687 |
curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
81d39c20f memcg: fix shrink... |
2688 |
/* Usage is reduced ? */ |
8c7c6e34a memcg: mem+swap c... |
2689 |
if (curusage >= oldusage) |
628f42355 memcg: limit chan... |
2690 |
retry_count--; |
81d39c20f memcg: fix shrink... |
2691 2692 |
else oldusage = curusage; |
628f42355 memcg: limit chan... |
2693 |
} |
3c11ecf44 memcg: oom kill d... |
2694 2695 |
if (!ret && enlarge) memcg_oom_recover(memcg); |
628f42355 memcg: limit chan... |
2696 2697 |
return ret; } |
4e4169535 memory controller... |
2698 2699 2700 2701 2702 2703 2704 2705 2706 |
unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, gfp_t gfp_mask, int nid, int zid) { unsigned long nr_reclaimed = 0; struct mem_cgroup_per_zone *mz, *next_mz = NULL; unsigned long reclaimed; int loop = 0; struct mem_cgroup_tree_per_zone *mctz; |
ef8745c1e memcg: reduce che... |
2707 |
unsigned long long excess; |
4e4169535 memory controller... |
2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 |
if (order > 0) return 0; mctz = soft_limit_tree_node_zone(nid, zid); /* * This loop can run a while, specially if mem_cgroup's continuously * keep exceeding their soft limit and putting the system under * pressure */ do { if (next_mz) mz = next_mz; else mz = mem_cgroup_largest_soft_limit_node(mctz); if (!mz) break; reclaimed = mem_cgroup_hierarchical_reclaim(mz->mem, zone, gfp_mask, MEM_CGROUP_RECLAIM_SOFT); nr_reclaimed += reclaimed; spin_lock(&mctz->lock); /* * If we failed to reclaim anything from this memory cgroup * it is time to move on to the next cgroup */ next_mz = NULL; if (!reclaimed) { do { /* * Loop until we find yet another one. * * By the time we get the soft_limit lock * again, someone might have aded the * group back on the RB tree. Iterate to * make sure we get a different mem. * mem_cgroup_largest_soft_limit_node returns * NULL if no other cgroup is present on * the tree */ next_mz = __mem_cgroup_largest_soft_limit_node(mctz); if (next_mz == mz) { css_put(&next_mz->mem->css); next_mz = NULL; } else /* next_mz == NULL or other memcg */ break; } while (1); } |
4e4169535 memory controller... |
2759 |
__mem_cgroup_remove_exceeded(mz->mem, mz, mctz); |
ef8745c1e memcg: reduce che... |
2760 |
excess = res_counter_soft_limit_excess(&mz->mem->res); |
4e4169535 memory controller... |
2761 2762 2763 2764 2765 2766 2767 2768 |
/* * One school of thought says that we should not add * back the node to the tree if reclaim returns 0. * But our reclaim could return 0, simply because due * to priority we are exposing a smaller subset of * memory to reclaim from. Consider this as a longer * term TODO. */ |
ef8745c1e memcg: reduce che... |
2769 2770 |
/* If excess == 0, no tree ops */ __mem_cgroup_insert_exceeded(mz->mem, mz, mctz, excess); |
4e4169535 memory controller... |
2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 |
spin_unlock(&mctz->lock); css_put(&mz->mem->css); loop++; /* * Could not reclaim anything and there are no more * mem cgroups to try or we seem to be looping without * reclaiming anything. */ if (!nr_reclaimed && (next_mz == NULL || loop > MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS)) break; } while (!nr_reclaimed); if (next_mz) css_put(&next_mz->mem->css); return nr_reclaimed; } |
c9b0ed514 memcg: helper fun... |
2788 |
/* |
cc8475822 memory cgroup enh... |
2789 |
* This routine traverse page_cgroup in given list and drop them all. |
cc8475822 memory cgroup enh... |
2790 2791 |
* *And* this routine doesn't reclaim page itself, just removes page_cgroup. */ |
f817ed485 memcg: move all a... |
2792 |
static int mem_cgroup_force_empty_list(struct mem_cgroup *mem, |
08e552c69 memcg: synchroniz... |
2793 |
int node, int zid, enum lru_list lru) |
cc8475822 memory cgroup enh... |
2794 |
{ |
08e552c69 memcg: synchroniz... |
2795 2796 |
struct zone *zone; struct mem_cgroup_per_zone *mz; |
f817ed485 memcg: move all a... |
2797 |
struct page_cgroup *pc, *busy; |
08e552c69 memcg: synchroniz... |
2798 |
unsigned long flags, loop; |
072c56c13 per-zone and recl... |
2799 |
struct list_head *list; |
f817ed485 memcg: move all a... |
2800 |
int ret = 0; |
072c56c13 per-zone and recl... |
2801 |
|
08e552c69 memcg: synchroniz... |
2802 2803 |
zone = &NODE_DATA(node)->node_zones[zid]; mz = mem_cgroup_zoneinfo(mem, node, zid); |
b69408e88 vmscan: Use an in... |
2804 |
list = &mz->lists[lru]; |
cc8475822 memory cgroup enh... |
2805 |
|
f817ed485 memcg: move all a... |
2806 2807 2808 2809 2810 2811 |
loop = MEM_CGROUP_ZSTAT(mz, lru); /* give some margin against EBUSY etc...*/ loop += 256; busy = NULL; while (loop--) { ret = 0; |
08e552c69 memcg: synchroniz... |
2812 |
spin_lock_irqsave(&zone->lru_lock, flags); |
f817ed485 memcg: move all a... |
2813 |
if (list_empty(list)) { |
08e552c69 memcg: synchroniz... |
2814 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
52d4b9ac0 memcg: allocate a... |
2815 |
break; |
f817ed485 memcg: move all a... |
2816 2817 2818 2819 |
} pc = list_entry(list->prev, struct page_cgroup, lru); if (busy == pc) { list_move(&pc->lru, list); |
648bcc771 mm/memcontrol.c: ... |
2820 |
busy = NULL; |
08e552c69 memcg: synchroniz... |
2821 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
f817ed485 memcg: move all a... |
2822 2823 |
continue; } |
08e552c69 memcg: synchroniz... |
2824 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
f817ed485 memcg: move all a... |
2825 |
|
2c26fdd70 memcg: revert gfp... |
2826 |
ret = mem_cgroup_move_parent(pc, mem, GFP_KERNEL); |
f817ed485 memcg: move all a... |
2827 |
if (ret == -ENOMEM) |
52d4b9ac0 memcg: allocate a... |
2828 |
break; |
f817ed485 memcg: move all a... |
2829 2830 2831 2832 2833 2834 2835 |
if (ret == -EBUSY || ret == -EINVAL) { /* found lock contention or "pc" is obsolete. */ busy = pc; cond_resched(); } else busy = NULL; |
cc8475822 memory cgroup enh... |
2836 |
} |
08e552c69 memcg: synchroniz... |
2837 |
|
f817ed485 memcg: move all a... |
2838 2839 2840 |
if (!ret && !list_empty(list)) return -EBUSY; return ret; |
cc8475822 memory cgroup enh... |
2841 2842 2843 2844 2845 2846 |
} /* * make mem_cgroup's charge to be 0 if there is no task. * This enables deleting this mem_cgroup. */ |
c1e862c1f memcg: new force_... |
2847 |
static int mem_cgroup_force_empty(struct mem_cgroup *mem, bool free_all) |
cc8475822 memory cgroup enh... |
2848 |
{ |
f817ed485 memcg: move all a... |
2849 2850 2851 |
int ret; int node, zid, shrink; int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
c1e862c1f memcg: new force_... |
2852 |
struct cgroup *cgrp = mem->css.cgroup; |
8869b8f6e memcg: memcontrol... |
2853 |
|
cc8475822 memory cgroup enh... |
2854 |
css_get(&mem->css); |
f817ed485 memcg: move all a... |
2855 2856 |
shrink = 0; |
c1e862c1f memcg: new force_... |
2857 2858 2859 |
/* should free all ? */ if (free_all) goto try_to_free; |
f817ed485 memcg: move all a... |
2860 |
move_account: |
fce664775 memcg: ensure lis... |
2861 |
do { |
f817ed485 memcg: move all a... |
2862 |
ret = -EBUSY; |
c1e862c1f memcg: new force_... |
2863 2864 2865 2866 |
if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children)) goto out; ret = -EINTR; if (signal_pending(current)) |
cc8475822 memory cgroup enh... |
2867 |
goto out; |
52d4b9ac0 memcg: allocate a... |
2868 2869 |
/* This is for making all *used* pages to be on LRU. */ lru_add_drain_all(); |
cdec2e426 memcg: coalesce c... |
2870 |
drain_all_stock_sync(); |
f817ed485 memcg: move all a... |
2871 |
ret = 0; |
299b4eaa3 memcg: NULL point... |
2872 |
for_each_node_state(node, N_HIGH_MEMORY) { |
f817ed485 memcg: move all a... |
2873 |
for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) { |
b69408e88 vmscan: Use an in... |
2874 |
enum lru_list l; |
f817ed485 memcg: move all a... |
2875 2876 |
for_each_lru(l) { ret = mem_cgroup_force_empty_list(mem, |
08e552c69 memcg: synchroniz... |
2877 |
node, zid, l); |
f817ed485 memcg: move all a... |
2878 2879 2880 |
if (ret) break; } |
1ecaab2bd per-zone and recl... |
2881 |
} |
f817ed485 memcg: move all a... |
2882 2883 2884 |
if (ret) break; } |
3c11ecf44 memcg: oom kill d... |
2885 |
memcg_oom_recover(mem); |
f817ed485 memcg: move all a... |
2886 2887 2888 |
/* it seems parent cgroup doesn't have enough mem */ if (ret == -ENOMEM) goto try_to_free; |
52d4b9ac0 memcg: allocate a... |
2889 |
cond_resched(); |
fce664775 memcg: ensure lis... |
2890 2891 |
/* "ret" should also be checked to ensure all lists are empty. */ } while (mem->res.usage > 0 || ret); |
cc8475822 memory cgroup enh... |
2892 2893 2894 |
out: css_put(&mem->css); return ret; |
f817ed485 memcg: move all a... |
2895 2896 |
try_to_free: |
c1e862c1f memcg: new force_... |
2897 2898 |
/* returns EBUSY if there is a task or if we come here twice. */ if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children) || shrink) { |
f817ed485 memcg: move all a... |
2899 2900 2901 |
ret = -EBUSY; goto out; } |
c1e862c1f memcg: new force_... |
2902 2903 |
/* we call try-to-free pages for make this cgroup empty */ lru_add_drain_all(); |
f817ed485 memcg: move all a... |
2904 2905 2906 2907 |
/* try to free all pages in this cgroup */ shrink = 1; while (nr_retries && mem->res.usage > 0) { int progress; |
c1e862c1f memcg: new force_... |
2908 2909 2910 2911 2912 |
if (signal_pending(current)) { ret = -EINTR; goto out; } |
a7885eb8a memcg: swappiness |
2913 2914 |
progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL, false, get_swappiness(mem)); |
c1e862c1f memcg: new force_... |
2915 |
if (!progress) { |
f817ed485 memcg: move all a... |
2916 |
nr_retries--; |
c1e862c1f memcg: new force_... |
2917 |
/* maybe some writeback is necessary */ |
8aa7e847d Fix congestion_wa... |
2918 |
congestion_wait(BLK_RW_ASYNC, HZ/10); |
c1e862c1f memcg: new force_... |
2919 |
} |
f817ed485 memcg: move all a... |
2920 2921 |
} |
08e552c69 memcg: synchroniz... |
2922 |
lru_add_drain(); |
f817ed485 memcg: move all a... |
2923 |
/* try move_account...there may be some *locked* pages. */ |
fce664775 memcg: ensure lis... |
2924 |
goto move_account; |
cc8475822 memory cgroup enh... |
2925 |
} |
c1e862c1f memcg: new force_... |
2926 2927 2928 2929 |
int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) { return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true); } |
18f59ea7d memcg: memory cgr... |
2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 |
static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft) { return mem_cgroup_from_cont(cont)->use_hierarchy; } static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft, u64 val) { int retval = 0; struct mem_cgroup *mem = mem_cgroup_from_cont(cont); struct cgroup *parent = cont->parent; struct mem_cgroup *parent_mem = NULL; if (parent) parent_mem = mem_cgroup_from_cont(parent); cgroup_lock(); /* |
af901ca18 tree-wide: fix as... |
2948 |
* If parent's use_hierarchy is set, we can't make any modifications |
18f59ea7d memcg: memory cgr... |
2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 |
* in the child subtrees. If it is unset, then the change can * occur, provided the current cgroup has no children. * * For the root cgroup, parent_mem is NULL, we allow value to be * set if there are no children. */ if ((!parent_mem || !parent_mem->use_hierarchy) && (val == 1 || val == 0)) { if (list_empty(&cont->children)) mem->use_hierarchy = val; else retval = -EBUSY; } else retval = -EINVAL; cgroup_unlock(); return retval; } |
0c3e73e84 memcg: improve re... |
2967 2968 2969 2970 2971 2972 2973 2974 2975 |
struct mem_cgroup_idx_data { s64 val; enum mem_cgroup_stat_index idx; }; static int mem_cgroup_get_idx_stat(struct mem_cgroup *mem, void *data) { struct mem_cgroup_idx_data *d = data; |
c62b1a3b3 memcg: use generi... |
2976 |
d->val += mem_cgroup_read_stat(mem, d->idx); |
0c3e73e84 memcg: improve re... |
2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 |
return 0; } static void mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem, enum mem_cgroup_stat_index idx, s64 *val) { struct mem_cgroup_idx_data d; d.idx = idx; d.val = 0; mem_cgroup_walk_tree(mem, &d, mem_cgroup_get_idx_stat); *val = d.val; } |
104f39284 memcg: extract me... |
2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 |
static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap) { u64 idx_val, val; if (!mem_cgroup_is_root(mem)) { if (!swap) return res_counter_read_u64(&mem->res, RES_USAGE); else return res_counter_read_u64(&mem->memsw, RES_USAGE); } mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE, &idx_val); val = idx_val; mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS, &idx_val); val += idx_val; if (swap) { mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_SWAPOUT, &idx_val); val += idx_val; } return val << PAGE_SHIFT; } |
2c3daa722 CGroup API files:... |
3014 |
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) |
8cdea7c05 Memory controller... |
3015 |
{ |
8c7c6e34a memcg: mem+swap c... |
3016 |
struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
104f39284 memcg: extract me... |
3017 |
u64 val; |
8c7c6e34a memcg: mem+swap c... |
3018 3019 3020 3021 3022 3023 |
int type, name; type = MEMFILE_TYPE(cft->private); name = MEMFILE_ATTR(cft->private); switch (type) { case _MEM: |
104f39284 memcg: extract me... |
3024 3025 3026 |
if (name == RES_USAGE) val = mem_cgroup_usage(mem, false); else |
0c3e73e84 memcg: improve re... |
3027 |
val = res_counter_read_u64(&mem->res, name); |
8c7c6e34a memcg: mem+swap c... |
3028 3029 |
break; case _MEMSWAP: |
104f39284 memcg: extract me... |
3030 3031 3032 |
if (name == RES_USAGE) val = mem_cgroup_usage(mem, true); else |
0c3e73e84 memcg: improve re... |
3033 |
val = res_counter_read_u64(&mem->memsw, name); |
8c7c6e34a memcg: mem+swap c... |
3034 3035 3036 3037 3038 3039 |
break; default: BUG(); break; } return val; |
8cdea7c05 Memory controller... |
3040 |
} |
628f42355 memcg: limit chan... |
3041 3042 3043 3044 |
/* * The user of this function is... * RES_LIMIT. */ |
856c13aa1 cgroup files: con... |
3045 3046 |
static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, const char *buffer) |
8cdea7c05 Memory controller... |
3047 |
{ |
628f42355 memcg: limit chan... |
3048 |
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); |
8c7c6e34a memcg: mem+swap c... |
3049 |
int type, name; |
628f42355 memcg: limit chan... |
3050 3051 |
unsigned long long val; int ret; |
8c7c6e34a memcg: mem+swap c... |
3052 3053 3054 |
type = MEMFILE_TYPE(cft->private); name = MEMFILE_ATTR(cft->private); switch (name) { |
628f42355 memcg: limit chan... |
3055 |
case RES_LIMIT: |
4b3bde4c9 memcg: remove the... |
3056 3057 3058 3059 |
if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */ ret = -EINVAL; break; } |
628f42355 memcg: limit chan... |
3060 3061 |
/* This function does all necessary parse...reuse it */ ret = res_counter_memparse_write_strategy(buffer, &val); |
8c7c6e34a memcg: mem+swap c... |
3062 3063 3064 |
if (ret) break; if (type == _MEM) |
628f42355 memcg: limit chan... |
3065 |
ret = mem_cgroup_resize_limit(memcg, val); |
8c7c6e34a memcg: mem+swap c... |
3066 3067 |
else ret = mem_cgroup_resize_memsw_limit(memcg, val); |
628f42355 memcg: limit chan... |
3068 |
break; |
296c81d89 memory controller... |
3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 |
case RES_SOFT_LIMIT: ret = res_counter_memparse_write_strategy(buffer, &val); if (ret) break; /* * For memsw, soft limits are hard to implement in terms * of semantics, for now, we support soft limits for * control without swap */ if (type == _MEM) ret = res_counter_set_soft_limit(&memcg->res, val); else ret = -EINVAL; break; |
628f42355 memcg: limit chan... |
3083 3084 3085 3086 3087 |
default: ret = -EINVAL; /* should be BUG() ? */ break; } return ret; |
8cdea7c05 Memory controller... |
3088 |
} |
fee7b548e memcg: show real ... |
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 |
static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg, unsigned long long *mem_limit, unsigned long long *memsw_limit) { struct cgroup *cgroup; unsigned long long min_limit, min_memsw_limit, tmp; min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT); min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); cgroup = memcg->css.cgroup; if (!memcg->use_hierarchy) goto out; while (cgroup->parent) { cgroup = cgroup->parent; memcg = mem_cgroup_from_cont(cgroup); if (!memcg->use_hierarchy) break; tmp = res_counter_read_u64(&memcg->res, RES_LIMIT); min_limit = min(min_limit, tmp); tmp = res_counter_read_u64(&memcg->memsw, RES_LIMIT); min_memsw_limit = min(min_memsw_limit, tmp); } out: *mem_limit = min_limit; *memsw_limit = min_memsw_limit; return; } |
29f2a4dac memcgroup: implem... |
3116 |
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) |
c84872e16 memcgroup: add th... |
3117 3118 |
{ struct mem_cgroup *mem; |
8c7c6e34a memcg: mem+swap c... |
3119 |
int type, name; |
c84872e16 memcgroup: add th... |
3120 3121 |
mem = mem_cgroup_from_cont(cont); |
8c7c6e34a memcg: mem+swap c... |
3122 3123 3124 |
type = MEMFILE_TYPE(event); name = MEMFILE_ATTR(event); switch (name) { |
29f2a4dac memcgroup: implem... |
3125 |
case RES_MAX_USAGE: |
8c7c6e34a memcg: mem+swap c... |
3126 3127 3128 3129 |
if (type == _MEM) res_counter_reset_max(&mem->res); else res_counter_reset_max(&mem->memsw); |
29f2a4dac memcgroup: implem... |
3130 3131 |
break; case RES_FAILCNT: |
8c7c6e34a memcg: mem+swap c... |
3132 3133 3134 3135 |
if (type == _MEM) res_counter_reset_failcnt(&mem->res); else res_counter_reset_failcnt(&mem->memsw); |
29f2a4dac memcgroup: implem... |
3136 3137 |
break; } |
f64c3f549 memory controller... |
3138 |
|
85cc59db1 memcgroup: use tr... |
3139 |
return 0; |
c84872e16 memcgroup: add th... |
3140 |
} |
7dc74be03 memcg: add interf... |
3141 3142 3143 3144 3145 |
static u64 mem_cgroup_move_charge_read(struct cgroup *cgrp, struct cftype *cft) { return mem_cgroup_from_cont(cgrp)->move_charge_at_immigrate; } |
024914477 memcg: move charg... |
3146 |
#ifdef CONFIG_MMU |
7dc74be03 memcg: add interf... |
3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 |
static int mem_cgroup_move_charge_write(struct cgroup *cgrp, struct cftype *cft, u64 val) { struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); if (val >= (1 << NR_MOVE_TYPE)) return -EINVAL; /* * We check this value several times in both in can_attach() and * attach(), so we need cgroup lock to prevent this value from being * inconsistent. */ cgroup_lock(); mem->move_charge_at_immigrate = val; cgroup_unlock(); return 0; } |
024914477 memcg: move charg... |
3165 3166 3167 3168 3169 3170 3171 |
#else static int mem_cgroup_move_charge_write(struct cgroup *cgrp, struct cftype *cft, u64 val) { return -ENOSYS; } #endif |
7dc74be03 memcg: add interf... |
3172 |
|
14067bb3e memcg: hierarchic... |
3173 3174 3175 3176 3177 |
/* For read statistics */ enum { MCS_CACHE, MCS_RSS, |
d8046582d memcg: make memcg... |
3178 |
MCS_FILE_MAPPED, |
14067bb3e memcg: hierarchic... |
3179 3180 |
MCS_PGPGIN, MCS_PGPGOUT, |
1dd3a2732 memcg: show swap ... |
3181 |
MCS_SWAP, |
14067bb3e memcg: hierarchic... |
3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 |
MCS_INACTIVE_ANON, MCS_ACTIVE_ANON, MCS_INACTIVE_FILE, MCS_ACTIVE_FILE, MCS_UNEVICTABLE, NR_MCS_STAT, }; struct mcs_total_stat { s64 stat[NR_MCS_STAT]; |
d2ceb9b7d memory cgroup enh... |
3192 |
}; |
14067bb3e memcg: hierarchic... |
3193 3194 3195 3196 3197 3198 |
struct { char *local_name; char *total_name; } memcg_stat_strings[NR_MCS_STAT] = { {"cache", "total_cache"}, {"rss", "total_rss"}, |
d69b042f3 memcg: add file-b... |
3199 |
{"mapped_file", "total_mapped_file"}, |
14067bb3e memcg: hierarchic... |
3200 3201 |
{"pgpgin", "total_pgpgin"}, {"pgpgout", "total_pgpgout"}, |
1dd3a2732 memcg: show swap ... |
3202 |
{"swap", "total_swap"}, |
14067bb3e memcg: hierarchic... |
3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 |
{"inactive_anon", "total_inactive_anon"}, {"active_anon", "total_active_anon"}, {"inactive_file", "total_inactive_file"}, {"active_file", "total_active_file"}, {"unevictable", "total_unevictable"} }; static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data) { struct mcs_total_stat *s = data; s64 val; /* per cpu stat */ |
c62b1a3b3 memcg: use generi... |
3217 |
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); |
14067bb3e memcg: hierarchic... |
3218 |
s->stat[MCS_CACHE] += val * PAGE_SIZE; |
c62b1a3b3 memcg: use generi... |
3219 |
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); |
14067bb3e memcg: hierarchic... |
3220 |
s->stat[MCS_RSS] += val * PAGE_SIZE; |
c62b1a3b3 memcg: use generi... |
3221 |
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_MAPPED); |
d8046582d memcg: make memcg... |
3222 |
s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE; |
c62b1a3b3 memcg: use generi... |
3223 |
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGIN_COUNT); |
14067bb3e memcg: hierarchic... |
3224 |
s->stat[MCS_PGPGIN] += val; |
c62b1a3b3 memcg: use generi... |
3225 |
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGOUT_COUNT); |
14067bb3e memcg: hierarchic... |
3226 |
s->stat[MCS_PGPGOUT] += val; |
1dd3a2732 memcg: show swap ... |
3227 |
if (do_swap_account) { |
c62b1a3b3 memcg: use generi... |
3228 |
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_SWAPOUT); |
1dd3a2732 memcg: show swap ... |
3229 3230 |
s->stat[MCS_SWAP] += val * PAGE_SIZE; } |
14067bb3e memcg: hierarchic... |
3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 |
/* per zone stat */ val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON); s->stat[MCS_INACTIVE_ANON] += val * PAGE_SIZE; val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_ANON); s->stat[MCS_ACTIVE_ANON] += val * PAGE_SIZE; val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_FILE); s->stat[MCS_INACTIVE_FILE] += val * PAGE_SIZE; val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_FILE); s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE; val = mem_cgroup_get_local_zonestat(mem, LRU_UNEVICTABLE); s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE; return 0; } static void mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s) { mem_cgroup_walk_tree(mem, s, mem_cgroup_get_local_stat); } |
c64745cf0 CGroup API files:... |
3251 3252 |
static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, struct cgroup_map_cb *cb) |
d2ceb9b7d memory cgroup enh... |
3253 |
{ |
d2ceb9b7d memory cgroup enh... |
3254 |
struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont); |
14067bb3e memcg: hierarchic... |
3255 |
struct mcs_total_stat mystat; |
d2ceb9b7d memory cgroup enh... |
3256 |
int i; |
14067bb3e memcg: hierarchic... |
3257 3258 |
memset(&mystat, 0, sizeof(mystat)); mem_cgroup_get_local_stat(mem_cont, &mystat); |
d2ceb9b7d memory cgroup enh... |
3259 |
|
1dd3a2732 memcg: show swap ... |
3260 3261 3262 |
for (i = 0; i < NR_MCS_STAT; i++) { if (i == MCS_SWAP && !do_swap_account) continue; |
14067bb3e memcg: hierarchic... |
3263 |
cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]); |
1dd3a2732 memcg: show swap ... |
3264 |
} |
7b854121e Unevictable LRU P... |
3265 |
|
14067bb3e memcg: hierarchic... |
3266 |
/* Hierarchical information */ |
fee7b548e memcg: show real ... |
3267 3268 3269 3270 3271 3272 3273 |
{ unsigned long long limit, memsw_limit; memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit); cb->fill(cb, "hierarchical_memory_limit", limit); if (do_swap_account) cb->fill(cb, "hierarchical_memsw_limit", memsw_limit); } |
7f016ee8b memcg: show recla... |
3274 |
|
14067bb3e memcg: hierarchic... |
3275 3276 |
memset(&mystat, 0, sizeof(mystat)); mem_cgroup_get_total_stat(mem_cont, &mystat); |
1dd3a2732 memcg: show swap ... |
3277 3278 3279 |
for (i = 0; i < NR_MCS_STAT; i++) { if (i == MCS_SWAP && !do_swap_account) continue; |
14067bb3e memcg: hierarchic... |
3280 |
cb->fill(cb, memcg_stat_strings[i].total_name, mystat.stat[i]); |
1dd3a2732 memcg: show swap ... |
3281 |
} |
14067bb3e memcg: hierarchic... |
3282 |
|
7f016ee8b memcg: show recla... |
3283 |
#ifdef CONFIG_DEBUG_VM |
c772be939 memcg: fix calcul... |
3284 |
cb->fill(cb, "inactive_ratio", calc_inactive_ratio(mem_cont, NULL)); |
7f016ee8b memcg: show recla... |
3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 |
{ int nid, zid; struct mem_cgroup_per_zone *mz; unsigned long recent_rotated[2] = {0, 0}; unsigned long recent_scanned[2] = {0, 0}; for_each_online_node(nid) for (zid = 0; zid < MAX_NR_ZONES; zid++) { mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); recent_rotated[0] += mz->reclaim_stat.recent_rotated[0]; recent_rotated[1] += mz->reclaim_stat.recent_rotated[1]; recent_scanned[0] += mz->reclaim_stat.recent_scanned[0]; recent_scanned[1] += mz->reclaim_stat.recent_scanned[1]; } cb->fill(cb, "recent_rotated_anon", recent_rotated[0]); cb->fill(cb, "recent_rotated_file", recent_rotated[1]); cb->fill(cb, "recent_scanned_anon", recent_scanned[0]); cb->fill(cb, "recent_scanned_file", recent_scanned[1]); } #endif |
d2ceb9b7d memory cgroup enh... |
3311 3312 |
return 0; } |
a7885eb8a memcg: swappiness |
3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 |
static u64 mem_cgroup_swappiness_read(struct cgroup *cgrp, struct cftype *cft) { struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); return get_swappiness(memcg); } static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft, u64 val) { struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); struct mem_cgroup *parent; |
068b38c1f memcg: fix a race... |
3325 |
|
a7885eb8a memcg: swappiness |
3326 3327 3328 3329 3330 3331 3332 |
if (val > 100) return -EINVAL; if (cgrp->parent == NULL) return -EINVAL; parent = mem_cgroup_from_cont(cgrp->parent); |
068b38c1f memcg: fix a race... |
3333 3334 |
cgroup_lock(); |
a7885eb8a memcg: swappiness |
3335 3336 |
/* If under hierarchy, only empty-root can set this value */ if ((parent->use_hierarchy) || |
068b38c1f memcg: fix a race... |
3337 3338 |
(memcg->use_hierarchy && !list_empty(&cgrp->children))) { cgroup_unlock(); |
a7885eb8a memcg: swappiness |
3339 |
return -EINVAL; |
068b38c1f memcg: fix a race... |
3340 |
} |
a7885eb8a memcg: swappiness |
3341 3342 3343 3344 |
spin_lock(&memcg->reclaim_param_lock); memcg->swappiness = val; spin_unlock(&memcg->reclaim_param_lock); |
068b38c1f memcg: fix a race... |
3345 |
cgroup_unlock(); |
a7885eb8a memcg: swappiness |
3346 3347 |
return 0; } |
2e72b6347 memcg: implement ... |
3348 3349 3350 3351 3352 3353 3354 3355 |
static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap) { struct mem_cgroup_threshold_ary *t; u64 usage; int i; rcu_read_lock(); if (!swap) |
2c488db27 memcg: clean up m... |
3356 |
t = rcu_dereference(memcg->thresholds.primary); |
2e72b6347 memcg: implement ... |
3357 |
else |
2c488db27 memcg: clean up m... |
3358 |
t = rcu_dereference(memcg->memsw_thresholds.primary); |
2e72b6347 memcg: implement ... |
3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 |
if (!t) goto unlock; usage = mem_cgroup_usage(memcg, swap); /* * current_threshold points to threshold just below usage. * If it's not true, a threshold was crossed after last * call of __mem_cgroup_threshold(). */ |
5407a5625 mm: remove unnece... |
3370 |
i = t->current_threshold; |
2e72b6347 memcg: implement ... |
3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 |
/* * Iterate backward over array of thresholds starting from * current_threshold and check if a threshold is crossed. * If none of thresholds below usage is crossed, we read * only one element of the array here. */ for (; i >= 0 && unlikely(t->entries[i].threshold > usage); i--) eventfd_signal(t->entries[i].eventfd, 1); /* i = current_threshold + 1 */ i++; /* * Iterate forward over array of thresholds starting from * current_threshold+1 and check if a threshold is crossed. * If none of thresholds above usage is crossed, we read * only one element of the array here. */ for (; i < t->size && unlikely(t->entries[i].threshold <= usage); i++) eventfd_signal(t->entries[i].eventfd, 1); /* Update current_threshold */ |
5407a5625 mm: remove unnece... |
3394 |
t->current_threshold = i - 1; |
2e72b6347 memcg: implement ... |
3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 |
unlock: rcu_read_unlock(); } static void mem_cgroup_threshold(struct mem_cgroup *memcg) { __mem_cgroup_threshold(memcg, false); if (do_swap_account) __mem_cgroup_threshold(memcg, true); } static int compare_thresholds(const void *a, const void *b) { const struct mem_cgroup_threshold *_a = a; const struct mem_cgroup_threshold *_b = b; return _a->threshold - _b->threshold; } |
9490ff275 memcg: oom notifier |
3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 |
static int mem_cgroup_oom_notify_cb(struct mem_cgroup *mem, void *data) { struct mem_cgroup_eventfd_list *ev; list_for_each_entry(ev, &mem->oom_notify, list) eventfd_signal(ev->eventfd, 1); return 0; } static void mem_cgroup_oom_notify(struct mem_cgroup *mem) { mem_cgroup_walk_tree(mem, NULL, mem_cgroup_oom_notify_cb); } static int mem_cgroup_usage_register_event(struct cgroup *cgrp, struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) |
2e72b6347 memcg: implement ... |
3429 3430 |
{ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
2c488db27 memcg: clean up m... |
3431 3432 |
struct mem_cgroup_thresholds *thresholds; struct mem_cgroup_threshold_ary *new; |
2e72b6347 memcg: implement ... |
3433 3434 |
int type = MEMFILE_TYPE(cft->private); u64 threshold, usage; |
2c488db27 memcg: clean up m... |
3435 |
int i, size, ret; |
2e72b6347 memcg: implement ... |
3436 3437 3438 3439 3440 3441 |
ret = res_counter_memparse_write_strategy(args, &threshold); if (ret) return ret; mutex_lock(&memcg->thresholds_lock); |
2c488db27 memcg: clean up m... |
3442 |
|
2e72b6347 memcg: implement ... |
3443 |
if (type == _MEM) |
2c488db27 memcg: clean up m... |
3444 |
thresholds = &memcg->thresholds; |
2e72b6347 memcg: implement ... |
3445 |
else if (type == _MEMSWAP) |
2c488db27 memcg: clean up m... |
3446 |
thresholds = &memcg->memsw_thresholds; |
2e72b6347 memcg: implement ... |
3447 3448 3449 3450 3451 3452 |
else BUG(); usage = mem_cgroup_usage(memcg, type == _MEMSWAP); /* Check if a threshold crossed before adding a new one */ |
2c488db27 memcg: clean up m... |
3453 |
if (thresholds->primary) |
2e72b6347 memcg: implement ... |
3454 |
__mem_cgroup_threshold(memcg, type == _MEMSWAP); |
2c488db27 memcg: clean up m... |
3455 |
size = thresholds->primary ? thresholds->primary->size + 1 : 1; |
2e72b6347 memcg: implement ... |
3456 3457 |
/* Allocate memory for new array of thresholds */ |
2c488db27 memcg: clean up m... |
3458 |
new = kmalloc(sizeof(*new) + size * sizeof(struct mem_cgroup_threshold), |
2e72b6347 memcg: implement ... |
3459 |
GFP_KERNEL); |
2c488db27 memcg: clean up m... |
3460 |
if (!new) { |
2e72b6347 memcg: implement ... |
3461 3462 3463 |
ret = -ENOMEM; goto unlock; } |
2c488db27 memcg: clean up m... |
3464 |
new->size = size; |
2e72b6347 memcg: implement ... |
3465 3466 |
/* Copy thresholds (if any) to new array */ |
2c488db27 memcg: clean up m... |
3467 3468 |
if (thresholds->primary) { memcpy(new->entries, thresholds->primary->entries, (size - 1) * |
2e72b6347 memcg: implement ... |
3469 |
sizeof(struct mem_cgroup_threshold)); |
2c488db27 memcg: clean up m... |
3470 |
} |
2e72b6347 memcg: implement ... |
3471 |
/* Add new threshold */ |
2c488db27 memcg: clean up m... |
3472 3473 |
new->entries[size - 1].eventfd = eventfd; new->entries[size - 1].threshold = threshold; |
2e72b6347 memcg: implement ... |
3474 3475 |
/* Sort thresholds. Registering of new threshold isn't time-critical */ |
2c488db27 memcg: clean up m... |
3476 |
sort(new->entries, size, sizeof(struct mem_cgroup_threshold), |
2e72b6347 memcg: implement ... |
3477 3478 3479 |
compare_thresholds, NULL); /* Find current threshold */ |
2c488db27 memcg: clean up m... |
3480 |
new->current_threshold = -1; |
2e72b6347 memcg: implement ... |
3481 |
for (i = 0; i < size; i++) { |
2c488db27 memcg: clean up m... |
3482 |
if (new->entries[i].threshold < usage) { |
2e72b6347 memcg: implement ... |
3483 |
/* |
2c488db27 memcg: clean up m... |
3484 3485 |
* new->current_threshold will not be used until * rcu_assign_pointer(), so it's safe to increment |
2e72b6347 memcg: implement ... |
3486 3487 |
* it here. */ |
2c488db27 memcg: clean up m... |
3488 |
++new->current_threshold; |
2e72b6347 memcg: implement ... |
3489 3490 |
} } |
2c488db27 memcg: clean up m... |
3491 3492 3493 3494 3495 |
/* Free old spare buffer and save old primary buffer as spare */ kfree(thresholds->spare); thresholds->spare = thresholds->primary; rcu_assign_pointer(thresholds->primary, new); |
2e72b6347 memcg: implement ... |
3496 |
|
907860ed3 cgroups: make cft... |
3497 |
/* To be sure that nobody uses thresholds */ |
2e72b6347 memcg: implement ... |
3498 |
synchronize_rcu(); |
2e72b6347 memcg: implement ... |
3499 3500 3501 3502 3503 |
unlock: mutex_unlock(&memcg->thresholds_lock); return ret; } |
907860ed3 cgroups: make cft... |
3504 |
static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp, |
9490ff275 memcg: oom notifier |
3505 |
struct cftype *cft, struct eventfd_ctx *eventfd) |
2e72b6347 memcg: implement ... |
3506 3507 |
{ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
2c488db27 memcg: clean up m... |
3508 3509 |
struct mem_cgroup_thresholds *thresholds; struct mem_cgroup_threshold_ary *new; |
2e72b6347 memcg: implement ... |
3510 3511 |
int type = MEMFILE_TYPE(cft->private); u64 usage; |
2c488db27 memcg: clean up m... |
3512 |
int i, j, size; |
2e72b6347 memcg: implement ... |
3513 3514 3515 |
mutex_lock(&memcg->thresholds_lock); if (type == _MEM) |
2c488db27 memcg: clean up m... |
3516 |
thresholds = &memcg->thresholds; |
2e72b6347 memcg: implement ... |
3517 |
else if (type == _MEMSWAP) |
2c488db27 memcg: clean up m... |
3518 |
thresholds = &memcg->memsw_thresholds; |
2e72b6347 memcg: implement ... |
3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 |
else BUG(); /* * Something went wrong if we trying to unregister a threshold * if we don't have thresholds */ BUG_ON(!thresholds); usage = mem_cgroup_usage(memcg, type == _MEMSWAP); /* Check if a threshold crossed before removing */ __mem_cgroup_threshold(memcg, type == _MEMSWAP); /* Calculate new number of threshold */ |
2c488db27 memcg: clean up m... |
3534 3535 3536 |
size = 0; for (i = 0; i < thresholds->primary->size; i++) { if (thresholds->primary->entries[i].eventfd != eventfd) |
2e72b6347 memcg: implement ... |
3537 3538 |
size++; } |
2c488db27 memcg: clean up m... |
3539 |
new = thresholds->spare; |
907860ed3 cgroups: make cft... |
3540 |
|
2e72b6347 memcg: implement ... |
3541 3542 |
/* Set thresholds array to NULL if we don't have thresholds */ if (!size) { |
2c488db27 memcg: clean up m... |
3543 3544 |
kfree(new); new = NULL; |
907860ed3 cgroups: make cft... |
3545 |
goto swap_buffers; |
2e72b6347 memcg: implement ... |
3546 |
} |
2c488db27 memcg: clean up m... |
3547 |
new->size = size; |
2e72b6347 memcg: implement ... |
3548 3549 |
/* Copy thresholds and find current threshold */ |
2c488db27 memcg: clean up m... |
3550 3551 3552 |
new->current_threshold = -1; for (i = 0, j = 0; i < thresholds->primary->size; i++) { if (thresholds->primary->entries[i].eventfd == eventfd) |
2e72b6347 memcg: implement ... |
3553 |
continue; |
2c488db27 memcg: clean up m... |
3554 3555 |
new->entries[j] = thresholds->primary->entries[i]; if (new->entries[j].threshold < usage) { |
2e72b6347 memcg: implement ... |
3556 |
/* |
2c488db27 memcg: clean up m... |
3557 |
* new->current_threshold will not be used |
2e72b6347 memcg: implement ... |
3558 3559 3560 |
* until rcu_assign_pointer(), so it's safe to increment * it here. */ |
2c488db27 memcg: clean up m... |
3561 |
++new->current_threshold; |
2e72b6347 memcg: implement ... |
3562 3563 3564 |
} j++; } |
907860ed3 cgroups: make cft... |
3565 |
swap_buffers: |
2c488db27 memcg: clean up m... |
3566 3567 3568 |
/* Swap primary and spare array */ thresholds->spare = thresholds->primary; rcu_assign_pointer(thresholds->primary, new); |
2e72b6347 memcg: implement ... |
3569 |
|
907860ed3 cgroups: make cft... |
3570 |
/* To be sure that nobody uses thresholds */ |
2e72b6347 memcg: implement ... |
3571 |
synchronize_rcu(); |
2e72b6347 memcg: implement ... |
3572 |
mutex_unlock(&memcg->thresholds_lock); |
2e72b6347 memcg: implement ... |
3573 |
} |
c1e862c1f memcg: new force_... |
3574 |
|
9490ff275 memcg: oom notifier |
3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 |
static int mem_cgroup_oom_register_event(struct cgroup *cgrp, struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) { struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); struct mem_cgroup_eventfd_list *event; int type = MEMFILE_TYPE(cft->private); BUG_ON(type != _OOM_TYPE); event = kmalloc(sizeof(*event), GFP_KERNEL); if (!event) return -ENOMEM; mutex_lock(&memcg_oom_mutex); event->eventfd = eventfd; list_add(&event->list, &memcg->oom_notify); /* already in OOM ? */ if (atomic_read(&memcg->oom_lock)) eventfd_signal(eventfd, 1); mutex_unlock(&memcg_oom_mutex); return 0; } |
907860ed3 cgroups: make cft... |
3599 |
static void mem_cgroup_oom_unregister_event(struct cgroup *cgrp, |
9490ff275 memcg: oom notifier |
3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 |
struct cftype *cft, struct eventfd_ctx *eventfd) { struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); struct mem_cgroup_eventfd_list *ev, *tmp; int type = MEMFILE_TYPE(cft->private); BUG_ON(type != _OOM_TYPE); mutex_lock(&memcg_oom_mutex); list_for_each_entry_safe(ev, tmp, &mem->oom_notify, list) { if (ev->eventfd == eventfd) { list_del(&ev->list); kfree(ev); } } mutex_unlock(&memcg_oom_mutex); |
9490ff275 memcg: oom notifier |
3618 |
} |
3c11ecf44 memcg: oom kill d... |
3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 |
static int mem_cgroup_oom_control_read(struct cgroup *cgrp, struct cftype *cft, struct cgroup_map_cb *cb) { struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); cb->fill(cb, "oom_kill_disable", mem->oom_kill_disable); if (atomic_read(&mem->oom_lock)) cb->fill(cb, "under_oom", 1); else cb->fill(cb, "under_oom", 0); return 0; } /* */ static int mem_cgroup_oom_control_write(struct cgroup *cgrp, struct cftype *cft, u64 val) { struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); struct mem_cgroup *parent; /* cannot set to root cgroup and only 0 and 1 are allowed */ if (!cgrp->parent || !((val == 0) || (val == 1))) return -EINVAL; parent = mem_cgroup_from_cont(cgrp->parent); cgroup_lock(); /* oom-kill-disable is a flag for subhierarchy. */ if ((parent->use_hierarchy) || (mem->use_hierarchy && !list_empty(&cgrp->children))) { cgroup_unlock(); return -EINVAL; } mem->oom_kill_disable = val; |
4d845ebf4 memcg: fix wake u... |
3655 3656 |
if (!val) memcg_oom_recover(mem); |
3c11ecf44 memcg: oom kill d... |
3657 3658 3659 |
cgroup_unlock(); return 0; } |
8cdea7c05 Memory controller... |
3660 3661 |
static struct cftype mem_cgroup_files[] = { { |
0eea10301 Memory controller... |
3662 |
.name = "usage_in_bytes", |
8c7c6e34a memcg: mem+swap c... |
3663 |
.private = MEMFILE_PRIVATE(_MEM, RES_USAGE), |
2c3daa722 CGroup API files:... |
3664 |
.read_u64 = mem_cgroup_read, |
9490ff275 memcg: oom notifier |
3665 3666 |
.register_event = mem_cgroup_usage_register_event, .unregister_event = mem_cgroup_usage_unregister_event, |
8cdea7c05 Memory controller... |
3667 3668 |
}, { |
c84872e16 memcgroup: add th... |
3669 |
.name = "max_usage_in_bytes", |
8c7c6e34a memcg: mem+swap c... |
3670 |
.private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), |
29f2a4dac memcgroup: implem... |
3671 |
.trigger = mem_cgroup_reset, |
c84872e16 memcgroup: add th... |
3672 3673 3674 |
.read_u64 = mem_cgroup_read, }, { |
0eea10301 Memory controller... |
3675 |
.name = "limit_in_bytes", |
8c7c6e34a memcg: mem+swap c... |
3676 |
.private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), |
856c13aa1 cgroup files: con... |
3677 |
.write_string = mem_cgroup_write, |
2c3daa722 CGroup API files:... |
3678 |
.read_u64 = mem_cgroup_read, |
8cdea7c05 Memory controller... |
3679 3680 |
}, { |
296c81d89 memory controller... |
3681 3682 3683 3684 3685 3686 |
.name = "soft_limit_in_bytes", .private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT), .write_string = mem_cgroup_write, .read_u64 = mem_cgroup_read, }, { |
8cdea7c05 Memory controller... |
3687 |
.name = "failcnt", |
8c7c6e34a memcg: mem+swap c... |
3688 |
.private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), |
29f2a4dac memcgroup: implem... |
3689 |
.trigger = mem_cgroup_reset, |
2c3daa722 CGroup API files:... |
3690 |
.read_u64 = mem_cgroup_read, |
8cdea7c05 Memory controller... |
3691 |
}, |
8697d3319 Memory controller... |
3692 |
{ |
d2ceb9b7d memory cgroup enh... |
3693 |
.name = "stat", |
c64745cf0 CGroup API files:... |
3694 |
.read_map = mem_control_stat_show, |
d2ceb9b7d memory cgroup enh... |
3695 |
}, |
c1e862c1f memcg: new force_... |
3696 3697 3698 3699 |
{ .name = "force_empty", .trigger = mem_cgroup_force_empty_write, }, |
18f59ea7d memcg: memory cgr... |
3700 3701 3702 3703 3704 |
{ .name = "use_hierarchy", .write_u64 = mem_cgroup_hierarchy_write, .read_u64 = mem_cgroup_hierarchy_read, }, |
a7885eb8a memcg: swappiness |
3705 3706 3707 3708 3709 |
{ .name = "swappiness", .read_u64 = mem_cgroup_swappiness_read, .write_u64 = mem_cgroup_swappiness_write, }, |
7dc74be03 memcg: add interf... |
3710 3711 3712 3713 3714 |
{ .name = "move_charge_at_immigrate", .read_u64 = mem_cgroup_move_charge_read, .write_u64 = mem_cgroup_move_charge_write, }, |
9490ff275 memcg: oom notifier |
3715 3716 |
{ .name = "oom_control", |
3c11ecf44 memcg: oom kill d... |
3717 3718 |
.read_map = mem_cgroup_oom_control_read, .write_u64 = mem_cgroup_oom_control_write, |
9490ff275 memcg: oom notifier |
3719 3720 3721 3722 |
.register_event = mem_cgroup_oom_register_event, .unregister_event = mem_cgroup_oom_unregister_event, .private = MEMFILE_PRIVATE(_OOM_TYPE, OOM_CONTROL), }, |
8cdea7c05 Memory controller... |
3723 |
}; |
8c7c6e34a memcg: mem+swap c... |
3724 3725 3726 3727 3728 3729 |
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP static struct cftype memsw_cgroup_files[] = { { .name = "memsw.usage_in_bytes", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), .read_u64 = mem_cgroup_read, |
9490ff275 memcg: oom notifier |
3730 3731 |
.register_event = mem_cgroup_usage_register_event, .unregister_event = mem_cgroup_usage_unregister_event, |
8c7c6e34a memcg: mem+swap c... |
3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 |
}, { .name = "memsw.max_usage_in_bytes", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), .trigger = mem_cgroup_reset, .read_u64 = mem_cgroup_read, }, { .name = "memsw.limit_in_bytes", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), .write_string = mem_cgroup_write, .read_u64 = mem_cgroup_read, }, { .name = "memsw.failcnt", .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), .trigger = mem_cgroup_reset, .read_u64 = mem_cgroup_read, }, }; static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) { if (!do_swap_account) return 0; return cgroup_add_files(cont, ss, memsw_cgroup_files, ARRAY_SIZE(memsw_cgroup_files)); }; #else static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) { return 0; } #endif |
6d12e2d8d per-zone and recl... |
3766 3767 3768 |
static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) { struct mem_cgroup_per_node *pn; |
1ecaab2bd per-zone and recl... |
3769 |
struct mem_cgroup_per_zone *mz; |
b69408e88 vmscan: Use an in... |
3770 |
enum lru_list l; |
41e3355de memcg: fix node_s... |
3771 |
int zone, tmp = node; |
1ecaab2bd per-zone and recl... |
3772 3773 3774 3775 3776 3777 3778 3779 |
/* * This routine is called against possible nodes. * But it's BUG to call kmalloc() against offline node. * * TODO: this routine can waste much memory for nodes which will * never be onlined. It's better to use memory hotplug callback * function. */ |
41e3355de memcg: fix node_s... |
3780 3781 3782 |
if (!node_state(node, N_NORMAL_MEMORY)) tmp = -1; pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp); |
6d12e2d8d per-zone and recl... |
3783 3784 |
if (!pn) return 1; |
1ecaab2bd per-zone and recl... |
3785 |
|
6d12e2d8d per-zone and recl... |
3786 3787 |
mem->info.nodeinfo[node] = pn; memset(pn, 0, sizeof(*pn)); |
1ecaab2bd per-zone and recl... |
3788 3789 3790 |
for (zone = 0; zone < MAX_NR_ZONES; zone++) { mz = &pn->zoneinfo[zone]; |
b69408e88 vmscan: Use an in... |
3791 3792 |
for_each_lru(l) INIT_LIST_HEAD(&mz->lists[l]); |
f64c3f549 memory controller... |
3793 |
mz->usage_in_excess = 0; |
4e4169535 memory controller... |
3794 3795 |
mz->on_tree = false; mz->mem = mem; |
1ecaab2bd per-zone and recl... |
3796 |
} |
6d12e2d8d per-zone and recl... |
3797 3798 |
return 0; } |
1ecaab2bd per-zone and recl... |
3799 3800 3801 3802 |
static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) { kfree(mem->info.nodeinfo[node]); } |
333279487 memcgroup: use vm... |
3803 3804 3805 |
static struct mem_cgroup *mem_cgroup_alloc(void) { struct mem_cgroup *mem; |
c62b1a3b3 memcg: use generi... |
3806 |
int size = sizeof(struct mem_cgroup); |
333279487 memcgroup: use vm... |
3807 |
|
c62b1a3b3 memcg: use generi... |
3808 |
/* Can be very big if MAX_NUMNODES is very big */ |
c8dad2bb6 memcg: reduce siz... |
3809 3810 |
if (size < PAGE_SIZE) mem = kmalloc(size, GFP_KERNEL); |
333279487 memcgroup: use vm... |
3811 |
else |
c8dad2bb6 memcg: reduce siz... |
3812 |
mem = vmalloc(size); |
333279487 memcgroup: use vm... |
3813 |
|
e7bbcdf37 memcontrol: fix p... |
3814 3815 3816 3817 |
if (!mem) return NULL; memset(mem, 0, size); |
c62b1a3b3 memcg: use generi... |
3818 3819 3820 3821 3822 3823 3824 3825 |
mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu); if (!mem->stat) { if (size < PAGE_SIZE) kfree(mem); else vfree(mem); mem = NULL; } |
333279487 memcgroup: use vm... |
3826 3827 |
return mem; } |
8c7c6e34a memcg: mem+swap c... |
3828 3829 3830 3831 3832 3833 3834 3835 |
/* * At destroying mem_cgroup, references from swap_cgroup can remain. * (scanning all at force_empty is too costly...) * * Instead of clearing all references at force_empty, we remember * the number of reference from swap_cgroup and free mem_cgroup when * it goes down to 0. * |
8c7c6e34a memcg: mem+swap c... |
3836 3837 |
* Removal of cgroup itself succeeds regardless of refs from swap. */ |
a7ba0eef3 memcg: fix double... |
3838 |
static void __mem_cgroup_free(struct mem_cgroup *mem) |
333279487 memcgroup: use vm... |
3839 |
{ |
08e552c69 memcg: synchroniz... |
3840 |
int node; |
f64c3f549 memory controller... |
3841 |
mem_cgroup_remove_from_trees(mem); |
04046e1a0 memcg: use CSS ID |
3842 |
free_css_id(&mem_cgroup_subsys, &mem->css); |
08e552c69 memcg: synchroniz... |
3843 3844 |
for_each_node_state(node, N_POSSIBLE) free_mem_cgroup_per_zone_info(mem, node); |
c62b1a3b3 memcg: use generi... |
3845 3846 |
free_percpu(mem->stat); if (sizeof(struct mem_cgroup) < PAGE_SIZE) |
333279487 memcgroup: use vm... |
3847 3848 3849 3850 |
kfree(mem); else vfree(mem); } |
8c7c6e34a memcg: mem+swap c... |
3851 3852 3853 3854 |
static void mem_cgroup_get(struct mem_cgroup *mem) { atomic_inc(&mem->refcnt); } |
483c30b51 memcg: improve pe... |
3855 |
static void __mem_cgroup_put(struct mem_cgroup *mem, int count) |
8c7c6e34a memcg: mem+swap c... |
3856 |
{ |
483c30b51 memcg: improve pe... |
3857 |
if (atomic_sub_and_test(count, &mem->refcnt)) { |
7bcc1bb12 memcg: get/put pa... |
3858 |
struct mem_cgroup *parent = parent_mem_cgroup(mem); |
a7ba0eef3 memcg: fix double... |
3859 |
__mem_cgroup_free(mem); |
7bcc1bb12 memcg: get/put pa... |
3860 3861 3862 |
if (parent) mem_cgroup_put(parent); } |
8c7c6e34a memcg: mem+swap c... |
3863 |
} |
483c30b51 memcg: improve pe... |
3864 3865 3866 3867 |
static void mem_cgroup_put(struct mem_cgroup *mem) { __mem_cgroup_put(mem, 1); } |
7bcc1bb12 memcg: get/put pa... |
3868 3869 3870 3871 3872 3873 3874 3875 3876 |
/* * Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled. */ static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem) { if (!mem->res.parent) return NULL; return mem_cgroup_from_res_counter(mem->res.parent, res); } |
333279487 memcgroup: use vm... |
3877 |
|
c077719be memcg: mem+swap c... |
3878 3879 3880 |
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP static void __init enable_swap_cgroup(void) { |
f8d665422 memcg: add mem_cg... |
3881 |
if (!mem_cgroup_disabled() && really_do_swap_account) |
c077719be memcg: mem+swap c... |
3882 3883 3884 3885 3886 3887 3888 |
do_swap_account = 1; } #else static void __init enable_swap_cgroup(void) { } #endif |
f64c3f549 memory controller... |
3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 |
static int mem_cgroup_soft_limit_tree_init(void) { struct mem_cgroup_tree_per_node *rtpn; struct mem_cgroup_tree_per_zone *rtpz; int tmp, node, zone; for_each_node_state(node, N_POSSIBLE) { tmp = node; if (!node_state(node, N_NORMAL_MEMORY)) tmp = -1; rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp); if (!rtpn) return 1; soft_limit_tree.rb_tree_per_node[node] = rtpn; for (zone = 0; zone < MAX_NR_ZONES; zone++) { rtpz = &rtpn->rb_tree_per_zone[zone]; rtpz->rb_root = RB_ROOT; spin_lock_init(&rtpz->lock); } } return 0; } |
0eb253e22 memcg: fix sectio... |
3913 |
static struct cgroup_subsys_state * __ref |
8cdea7c05 Memory controller... |
3914 3915 |
mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) { |
28dbc4b6a memcg: memory cgr... |
3916 |
struct mem_cgroup *mem, *parent; |
04046e1a0 memcg: use CSS ID |
3917 |
long error = -ENOMEM; |
6d12e2d8d per-zone and recl... |
3918 |
int node; |
8cdea7c05 Memory controller... |
3919 |
|
c8dad2bb6 memcg: reduce siz... |
3920 3921 |
mem = mem_cgroup_alloc(); if (!mem) |
04046e1a0 memcg: use CSS ID |
3922 |
return ERR_PTR(error); |
78fb74669 Memory controller... |
3923 |
|
6d12e2d8d per-zone and recl... |
3924 3925 3926 |
for_each_node_state(node, N_POSSIBLE) if (alloc_mem_cgroup_per_zone_info(mem, node)) goto free_out; |
f64c3f549 memory controller... |
3927 |
|
c077719be memcg: mem+swap c... |
3928 |
/* root ? */ |
28dbc4b6a memcg: memory cgr... |
3929 |
if (cont->parent == NULL) { |
cdec2e426 memcg: coalesce c... |
3930 |
int cpu; |
c077719be memcg: mem+swap c... |
3931 |
enable_swap_cgroup(); |
28dbc4b6a memcg: memory cgr... |
3932 |
parent = NULL; |
4b3bde4c9 memcg: remove the... |
3933 |
root_mem_cgroup = mem; |
f64c3f549 memory controller... |
3934 3935 |
if (mem_cgroup_soft_limit_tree_init()) goto free_out; |
cdec2e426 memcg: coalesce c... |
3936 3937 3938 3939 3940 3941 |
for_each_possible_cpu(cpu) { struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); INIT_WORK(&stock->work, drain_local_stock); } hotcpu_notifier(memcg_stock_cpu_callback, 0); |
18f59ea7d memcg: memory cgr... |
3942 |
} else { |
28dbc4b6a memcg: memory cgr... |
3943 |
parent = mem_cgroup_from_cont(cont->parent); |
18f59ea7d memcg: memory cgr... |
3944 |
mem->use_hierarchy = parent->use_hierarchy; |
3c11ecf44 memcg: oom kill d... |
3945 |
mem->oom_kill_disable = parent->oom_kill_disable; |
18f59ea7d memcg: memory cgr... |
3946 |
} |
28dbc4b6a memcg: memory cgr... |
3947 |
|
18f59ea7d memcg: memory cgr... |
3948 3949 3950 |
if (parent && parent->use_hierarchy) { res_counter_init(&mem->res, &parent->res); res_counter_init(&mem->memsw, &parent->memsw); |
7bcc1bb12 memcg: get/put pa... |
3951 3952 3953 3954 3955 3956 3957 |
/* * We increment refcnt of the parent to ensure that we can * safely access it on res_counter_charge/uncharge. * This refcnt will be decremented when freeing this * mem_cgroup(see mem_cgroup_put). */ mem_cgroup_get(parent); |
18f59ea7d memcg: memory cgr... |
3958 3959 3960 3961 |
} else { res_counter_init(&mem->res, NULL); res_counter_init(&mem->memsw, NULL); } |
04046e1a0 memcg: use CSS ID |
3962 |
mem->last_scanned_child = 0; |
2733c06ac memcg: protect pr... |
3963 |
spin_lock_init(&mem->reclaim_param_lock); |
9490ff275 memcg: oom notifier |
3964 |
INIT_LIST_HEAD(&mem->oom_notify); |
6d61ef409 memcg: memory cgr... |
3965 |
|
a7885eb8a memcg: swappiness |
3966 3967 |
if (parent) mem->swappiness = get_swappiness(parent); |
a7ba0eef3 memcg: fix double... |
3968 |
atomic_set(&mem->refcnt, 1); |
7dc74be03 memcg: add interf... |
3969 |
mem->move_charge_at_immigrate = 0; |
2e72b6347 memcg: implement ... |
3970 |
mutex_init(&mem->thresholds_lock); |
8cdea7c05 Memory controller... |
3971 |
return &mem->css; |
6d12e2d8d per-zone and recl... |
3972 |
free_out: |
a7ba0eef3 memcg: fix double... |
3973 |
__mem_cgroup_free(mem); |
4b3bde4c9 memcg: remove the... |
3974 |
root_mem_cgroup = NULL; |
04046e1a0 memcg: use CSS ID |
3975 |
return ERR_PTR(error); |
8cdea7c05 Memory controller... |
3976 |
} |
ec64f5154 cgroup: fix frequ... |
3977 |
static int mem_cgroup_pre_destroy(struct cgroup_subsys *ss, |
df878fb04 memory cgroup enh... |
3978 3979 3980 |
struct cgroup *cont) { struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
ec64f5154 cgroup: fix frequ... |
3981 3982 |
return mem_cgroup_force_empty(mem, false); |
df878fb04 memory cgroup enh... |
3983 |
} |
8cdea7c05 Memory controller... |
3984 3985 3986 |
static void mem_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cont) { |
c268e9946 memcg: fix hierar... |
3987 |
struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
c268e9946 memcg: fix hierar... |
3988 |
|
c268e9946 memcg: fix hierar... |
3989 |
mem_cgroup_put(mem); |
8cdea7c05 Memory controller... |
3990 3991 3992 3993 3994 |
} static int mem_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont) { |
8c7c6e34a memcg: mem+swap c... |
3995 3996 3997 3998 3999 4000 4001 4002 |
int ret; ret = cgroup_add_files(cont, ss, mem_cgroup_files, ARRAY_SIZE(mem_cgroup_files)); if (!ret) ret = register_memsw_files(cont, ss); return ret; |
8cdea7c05 Memory controller... |
4003 |
} |
024914477 memcg: move charg... |
4004 |
#ifdef CONFIG_MMU |
7dc74be03 memcg: add interf... |
4005 |
/* Handlers for move charge at task migration. */ |
854ffa8d1 memcg: improve pe... |
4006 4007 |
#define PRECHARGE_COUNT_AT_ONCE 256 static int mem_cgroup_do_precharge(unsigned long count) |
7dc74be03 memcg: add interf... |
4008 |
{ |
854ffa8d1 memcg: improve pe... |
4009 4010 |
int ret = 0; int batch_count = PRECHARGE_COUNT_AT_ONCE; |
4ffef5fef memcg: move charg... |
4011 |
struct mem_cgroup *mem = mc.to; |
854ffa8d1 memcg: improve pe... |
4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 |
if (mem_cgroup_is_root(mem)) { mc.precharge += count; /* we don't need css_get for root */ return ret; } /* try to charge at once */ if (count > 1) { struct res_counter *dummy; /* * "mem" cannot be under rmdir() because we've already checked * by cgroup_lock_live_cgroup() that it is not removed and we * are still under the same cgroup_mutex. So we can postpone * css_get(). */ if (res_counter_charge(&mem->res, PAGE_SIZE * count, &dummy)) goto one_by_one; if (do_swap_account && res_counter_charge(&mem->memsw, PAGE_SIZE * count, &dummy)) { res_counter_uncharge(&mem->res, PAGE_SIZE * count); goto one_by_one; } mc.precharge += count; VM_BUG_ON(test_bit(CSS_ROOT, &mem->css.flags)); WARN_ON_ONCE(count > INT_MAX); __css_get(&mem->css, (int)count); return ret; } one_by_one: /* fall back to one by one charge */ while (count--) { if (signal_pending(current)) { ret = -EINTR; break; } if (!batch_count--) { batch_count = PRECHARGE_COUNT_AT_ONCE; cond_resched(); } |
430e48631 memcg: update thr... |
4050 |
ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false); |
854ffa8d1 memcg: improve pe... |
4051 4052 4053 4054 4055 |
if (ret || !mem) /* mem_cgroup_clear_mc() will do uncharge later */ return -ENOMEM; mc.precharge++; } |
4ffef5fef memcg: move charg... |
4056 4057 4058 4059 4060 4061 4062 4063 |
return ret; } /** * is_target_pte_for_mc - check a pte whether it is valid for move charge * @vma: the vma the pte to be checked belongs * @addr: the address corresponding to the pte to be checked * @ptent: the pte to be checked |
024914477 memcg: move charg... |
4064 |
* @target: the pointer the target page or swap ent will be stored(can be NULL) |
4ffef5fef memcg: move charg... |
4065 4066 4067 4068 4069 4070 |
* * Returns * 0(MC_TARGET_NONE): if the pte is not a target for move charge. * 1(MC_TARGET_PAGE): if the page corresponding to this pte is a target for * move charge. if @target is not NULL, the page is stored in target->page * with extra refcnt got(Callers should handle it). |
024914477 memcg: move charg... |
4071 4072 4073 |
* 2(MC_TARGET_SWAP): if the swap entry corresponding to this pte is a * target for charge migration. if @target is not NULL, the entry is stored * in target->ent. |
4ffef5fef memcg: move charg... |
4074 4075 4076 |
* * Called with pte lock held. */ |
4ffef5fef memcg: move charg... |
4077 4078 |
union mc_target { struct page *page; |
024914477 memcg: move charg... |
4079 |
swp_entry_t ent; |
4ffef5fef memcg: move charg... |
4080 |
}; |
4ffef5fef memcg: move charg... |
4081 4082 4083 |
enum mc_target_type { MC_TARGET_NONE, /* not used */ MC_TARGET_PAGE, |
024914477 memcg: move charg... |
4084 |
MC_TARGET_SWAP, |
4ffef5fef memcg: move charg... |
4085 |
}; |
90254a658 memcg: clean up m... |
4086 4087 |
static struct page *mc_handle_present_pte(struct vm_area_struct *vma, unsigned long addr, pte_t ptent) |
4ffef5fef memcg: move charg... |
4088 |
{ |
90254a658 memcg: clean up m... |
4089 |
struct page *page = vm_normal_page(vma, addr, ptent); |
4ffef5fef memcg: move charg... |
4090 |
|
90254a658 memcg: clean up m... |
4091 4092 4093 4094 4095 4096 |
if (!page || !page_mapped(page)) return NULL; if (PageAnon(page)) { /* we don't move shared anon */ if (!move_anon() || page_mapcount(page) > 2) return NULL; |
87946a722 memcg: move charg... |
4097 4098 |
} else if (!move_file()) /* we ignore mapcount for file pages */ |
90254a658 memcg: clean up m... |
4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 |
return NULL; if (!get_page_unless_zero(page)) return NULL; return page; } static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, unsigned long addr, pte_t ptent, swp_entry_t *entry) { int usage_count; struct page *page = NULL; swp_entry_t ent = pte_to_swp_entry(ptent); if (!move_anon() || non_swap_entry(ent)) return NULL; usage_count = mem_cgroup_count_swap_user(ent, &page); if (usage_count > 1) { /* we don't move shared anon */ |
024914477 memcg: move charg... |
4117 4118 |
if (page) put_page(page); |
90254a658 memcg: clean up m... |
4119 |
return NULL; |
024914477 memcg: move charg... |
4120 |
} |
90254a658 memcg: clean up m... |
4121 4122 4123 4124 4125 |
if (do_swap_account) entry->val = ent.val; return page; } |
87946a722 memcg: move charg... |
4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 |
static struct page *mc_handle_file_pte(struct vm_area_struct *vma, unsigned long addr, pte_t ptent, swp_entry_t *entry) { struct page *page = NULL; struct inode *inode; struct address_space *mapping; pgoff_t pgoff; if (!vma->vm_file) /* anonymous vma */ return NULL; if (!move_file()) return NULL; inode = vma->vm_file->f_path.dentry->d_inode; mapping = vma->vm_file->f_mapping; if (pte_none(ptent)) pgoff = linear_page_index(vma, addr); else /* pte_file(ptent) is true */ pgoff = pte_to_pgoff(ptent); /* page is moved even if it's not RSS of this task(page-faulted). */ if (!mapping_cap_swap_backed(mapping)) { /* normal file */ page = find_get_page(mapping, pgoff); } else { /* shmem/tmpfs file. we should take account of swap too. */ swp_entry_t ent; mem_cgroup_get_shmem_target(inode, pgoff, &page, &ent); if (do_swap_account) entry->val = ent.val; } return page; } |
90254a658 memcg: clean up m... |
4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 |
static int is_target_pte_for_mc(struct vm_area_struct *vma, unsigned long addr, pte_t ptent, union mc_target *target) { struct page *page = NULL; struct page_cgroup *pc; int ret = 0; swp_entry_t ent = { .val = 0 }; if (pte_present(ptent)) page = mc_handle_present_pte(vma, addr, ptent); else if (is_swap_pte(ptent)) page = mc_handle_swap_pte(vma, addr, ptent, &ent); |
87946a722 memcg: move charg... |
4170 4171 |
else if (pte_none(ptent) || pte_file(ptent)) page = mc_handle_file_pte(vma, addr, ptent, &ent); |
90254a658 memcg: clean up m... |
4172 4173 4174 |
if (!page && !ent.val) return 0; |
024914477 memcg: move charg... |
4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 |
if (page) { pc = lookup_page_cgroup(page); /* * Do only loose check w/o page_cgroup lock. * mem_cgroup_move_account() checks the pc is valid or not under * the lock. */ if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) { ret = MC_TARGET_PAGE; if (target) target->page = page; } if (!ret || !target) put_page(page); } |
90254a658 memcg: clean up m... |
4190 4191 |
/* There is a swap entry and a page doesn't exist or isn't charged */ if (ent.val && !ret && |
7f0f15464 memcg: fix css_id... |
4192 4193 4194 4195 |
css_id(&mc.from->css) == lookup_swap_cgroup(ent)) { ret = MC_TARGET_SWAP; if (target) target->ent = ent; |
4ffef5fef memcg: move charg... |
4196 |
} |
4ffef5fef memcg: move charg... |
4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 |
return ret; } static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) { struct vm_area_struct *vma = walk->private; pte_t *pte; spinlock_t *ptl; pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) if (is_target_pte_for_mc(vma, addr, *pte, NULL)) mc.precharge++; /* increment precharge temporarily */ pte_unmap_unlock(pte - 1, ptl); cond_resched(); |
7dc74be03 memcg: add interf... |
4214 4215 |
return 0; } |
4ffef5fef memcg: move charg... |
4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 |
static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm) { unsigned long precharge; struct vm_area_struct *vma; down_read(&mm->mmap_sem); for (vma = mm->mmap; vma; vma = vma->vm_next) { struct mm_walk mem_cgroup_count_precharge_walk = { .pmd_entry = mem_cgroup_count_precharge_pte_range, .mm = mm, .private = vma, }; if (is_vm_hugetlb_page(vma)) continue; |
4ffef5fef memcg: move charg... |
4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 |
walk_page_range(vma->vm_start, vma->vm_end, &mem_cgroup_count_precharge_walk); } up_read(&mm->mmap_sem); precharge = mc.precharge; mc.precharge = 0; return precharge; } |
4ffef5fef memcg: move charg... |
4240 4241 |
static int mem_cgroup_precharge_mc(struct mm_struct *mm) { |
854ffa8d1 memcg: improve pe... |
4242 |
return mem_cgroup_do_precharge(mem_cgroup_count_precharge(mm)); |
4ffef5fef memcg: move charg... |
4243 4244 4245 4246 4247 |
} static void mem_cgroup_clear_mc(void) { /* we must uncharge all the leftover precharges from mc.to */ |
854ffa8d1 memcg: improve pe... |
4248 4249 4250 |
if (mc.precharge) { __mem_cgroup_cancel_charge(mc.to, mc.precharge); mc.precharge = 0; |
3c11ecf44 memcg: oom kill d... |
4251 |
memcg_oom_recover(mc.to); |
854ffa8d1 memcg: improve pe... |
4252 4253 4254 4255 4256 4257 4258 4259 |
} /* * we didn't uncharge from mc.from at mem_cgroup_move_account(), so * we must uncharge here. */ if (mc.moved_charge) { __mem_cgroup_cancel_charge(mc.from, mc.moved_charge); mc.moved_charge = 0; |
3c11ecf44 memcg: oom kill d... |
4260 |
memcg_oom_recover(mc.from); |
4ffef5fef memcg: move charg... |
4261 |
} |
483c30b51 memcg: improve pe... |
4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 |
/* we must fixup refcnts and charges */ if (mc.moved_swap) { WARN_ON_ONCE(mc.moved_swap > INT_MAX); /* uncharge swap account from the old cgroup */ if (!mem_cgroup_is_root(mc.from)) res_counter_uncharge(&mc.from->memsw, PAGE_SIZE * mc.moved_swap); __mem_cgroup_put(mc.from, mc.moved_swap); if (!mem_cgroup_is_root(mc.to)) { /* * we charged both to->res and to->memsw, so we should * uncharge to->res. */ res_counter_uncharge(&mc.to->res, PAGE_SIZE * mc.moved_swap); VM_BUG_ON(test_bit(CSS_ROOT, &mc.to->css.flags)); __css_put(&mc.to->css, mc.moved_swap); } /* we've already done mem_cgroup_get(mc.to) */ mc.moved_swap = 0; } |
4ffef5fef memcg: move charg... |
4285 4286 |
mc.from = NULL; mc.to = NULL; |
8033b97c9 memcg: avoid oom ... |
4287 4288 |
mc.moving_task = NULL; wake_up_all(&mc.waitq); |
4ffef5fef memcg: move charg... |
4289 |
} |
7dc74be03 memcg: add interf... |
4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 |
static int mem_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, struct task_struct *p, bool threadgroup) { int ret = 0; struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup); if (mem->move_charge_at_immigrate) { struct mm_struct *mm; struct mem_cgroup *from = mem_cgroup_from_task(p); VM_BUG_ON(from == mem); mm = get_task_mm(p); if (!mm) return 0; |
7dc74be03 memcg: add interf... |
4307 |
/* We move charges only when we move a owner of the mm */ |
4ffef5fef memcg: move charg... |
4308 4309 4310 4311 |
if (mm->owner == p) { VM_BUG_ON(mc.from); VM_BUG_ON(mc.to); VM_BUG_ON(mc.precharge); |
854ffa8d1 memcg: improve pe... |
4312 |
VM_BUG_ON(mc.moved_charge); |
483c30b51 memcg: improve pe... |
4313 |
VM_BUG_ON(mc.moved_swap); |
8033b97c9 memcg: avoid oom ... |
4314 |
VM_BUG_ON(mc.moving_task); |
4ffef5fef memcg: move charg... |
4315 4316 4317 |
mc.from = from; mc.to = mem; mc.precharge = 0; |
854ffa8d1 memcg: improve pe... |
4318 |
mc.moved_charge = 0; |
483c30b51 memcg: improve pe... |
4319 |
mc.moved_swap = 0; |
8033b97c9 memcg: avoid oom ... |
4320 |
mc.moving_task = current; |
4ffef5fef memcg: move charg... |
4321 4322 4323 4324 4325 |
ret = mem_cgroup_precharge_mc(mm); if (ret) mem_cgroup_clear_mc(); } |
7dc74be03 memcg: add interf... |
4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 |
mmput(mm); } return ret; } static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, struct task_struct *p, bool threadgroup) { |
4ffef5fef memcg: move charg... |
4336 |
mem_cgroup_clear_mc(); |
7dc74be03 memcg: add interf... |
4337 |
} |
4ffef5fef memcg: move charg... |
4338 4339 4340 |
static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) |
7dc74be03 memcg: add interf... |
4341 |
{ |
4ffef5fef memcg: move charg... |
4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 |
int ret = 0; struct vm_area_struct *vma = walk->private; pte_t *pte; spinlock_t *ptl; retry: pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; addr += PAGE_SIZE) { pte_t ptent = *(pte++); union mc_target target; int type; struct page *page; struct page_cgroup *pc; |
024914477 memcg: move charg... |
4355 |
swp_entry_t ent; |
4ffef5fef memcg: move charg... |
4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 |
if (!mc.precharge) break; type = is_target_pte_for_mc(vma, addr, ptent, &target); switch (type) { case MC_TARGET_PAGE: page = target.page; if (isolate_lru_page(page)) goto put; pc = lookup_page_cgroup(page); |
854ffa8d1 memcg: improve pe... |
4367 4368 |
if (!mem_cgroup_move_account(pc, mc.from, mc.to, false)) { |
4ffef5fef memcg: move charg... |
4369 |
mc.precharge--; |
854ffa8d1 memcg: improve pe... |
4370 4371 |
/* we uncharge from mc.from later. */ mc.moved_charge++; |
4ffef5fef memcg: move charg... |
4372 4373 4374 4375 4376 |
} putback_lru_page(page); put: /* is_target_pte_for_mc() gets the page */ put_page(page); break; |
024914477 memcg: move charg... |
4377 4378 |
case MC_TARGET_SWAP: ent = target.ent; |
483c30b51 memcg: improve pe... |
4379 4380 |
if (!mem_cgroup_move_swap_account(ent, mc.from, mc.to, false)) { |
024914477 memcg: move charg... |
4381 |
mc.precharge--; |
483c30b51 memcg: improve pe... |
4382 4383 4384 |
/* we fixup refcnts and charges later. */ mc.moved_swap++; } |
024914477 memcg: move charg... |
4385 |
break; |
4ffef5fef memcg: move charg... |
4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 |
default: break; } } pte_unmap_unlock(pte - 1, ptl); cond_resched(); if (addr != end) { /* * We have consumed all precharges we got in can_attach(). * We try charge one by one, but don't do any additional * charges to mc.to if we have failed in charge once in attach() * phase. */ |
854ffa8d1 memcg: improve pe... |
4400 |
ret = mem_cgroup_do_precharge(1); |
4ffef5fef memcg: move charg... |
4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 |
if (!ret) goto retry; } return ret; } static void mem_cgroup_move_charge(struct mm_struct *mm) { struct vm_area_struct *vma; lru_add_drain_all(); down_read(&mm->mmap_sem); for (vma = mm->mmap; vma; vma = vma->vm_next) { int ret; struct mm_walk mem_cgroup_move_charge_walk = { .pmd_entry = mem_cgroup_move_charge_pte_range, .mm = mm, .private = vma, }; if (is_vm_hugetlb_page(vma)) continue; |
4ffef5fef memcg: move charg... |
4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 |
ret = walk_page_range(vma->vm_start, vma->vm_end, &mem_cgroup_move_charge_walk); if (ret) /* * means we have consumed all precharges and failed in * doing additional charge. Just abandon here. */ break; } up_read(&mm->mmap_sem); |
7dc74be03 memcg: add interf... |
4433 |
} |
67e465a77 Memory controller... |
4434 4435 4436 |
static void mem_cgroup_move_task(struct cgroup_subsys *ss, struct cgroup *cont, struct cgroup *old_cont, |
be367d099 cgroups: let ss->... |
4437 4438 |
struct task_struct *p, bool threadgroup) |
67e465a77 Memory controller... |
4439 |
{ |
4ffef5fef memcg: move charg... |
4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 |
struct mm_struct *mm; if (!mc.to) /* no need to move charge */ return; mm = get_task_mm(p); if (mm) { mem_cgroup_move_charge(mm); mmput(mm); } mem_cgroup_clear_mc(); |
67e465a77 Memory controller... |
4452 |
} |
5cfb80a73 memcg: disable mo... |
4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 |
#else /* !CONFIG_MMU */ static int mem_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, struct task_struct *p, bool threadgroup) { return 0; } static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, struct task_struct *p, bool threadgroup) { } static void mem_cgroup_move_task(struct cgroup_subsys *ss, struct cgroup *cont, struct cgroup *old_cont, struct task_struct *p, bool threadgroup) { } #endif |
67e465a77 Memory controller... |
4475 |
|
8cdea7c05 Memory controller... |
4476 4477 4478 4479 |
struct cgroup_subsys mem_cgroup_subsys = { .name = "memory", .subsys_id = mem_cgroup_subsys_id, .create = mem_cgroup_create, |
df878fb04 memory cgroup enh... |
4480 |
.pre_destroy = mem_cgroup_pre_destroy, |
8cdea7c05 Memory controller... |
4481 4482 |
.destroy = mem_cgroup_destroy, .populate = mem_cgroup_populate, |
7dc74be03 memcg: add interf... |
4483 4484 |
.can_attach = mem_cgroup_can_attach, .cancel_attach = mem_cgroup_cancel_attach, |
67e465a77 Memory controller... |
4485 |
.attach = mem_cgroup_move_task, |
6d12e2d8d per-zone and recl... |
4486 |
.early_init = 0, |
04046e1a0 memcg: use CSS ID |
4487 |
.use_id = 1, |
8cdea7c05 Memory controller... |
4488 |
}; |
c077719be memcg: mem+swap c... |
4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 |
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP static int __init disable_swap_account(char *s) { really_do_swap_account = 0; return 1; } __setup("noswapaccount", disable_swap_account); #endif |