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block/cfq-iosched.c
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/* |
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* CFQ, or complete fairness queueing, disk scheduler. * * Based on ideas from a previously unfinished io * scheduler (round robin per-process disk scheduling) and Andrea Arcangeli. * |
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* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/blkdev.h> #include <linux/elevator.h> |
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#include <linux/jiffies.h> |
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#include <linux/rbtree.h> |
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#include <linux/ioprio.h> |
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#include <linux/blktrace_api.h> |
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#include "blk.h" |
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#include "cfq.h" |
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/* * tunables */ |
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/* max queue in one round of service */ |
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static const int cfq_quantum = 8; |
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static const int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 }; |
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/* maximum backwards seek, in KiB */ static const int cfq_back_max = 16 * 1024; /* penalty of a backwards seek */ static const int cfq_back_penalty = 2; |
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static const int cfq_slice_sync = HZ / 10; |
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static int cfq_slice_async = HZ / 25; |
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static const int cfq_slice_async_rq = 2; |
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static int cfq_slice_idle = HZ / 125; |
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static int cfq_group_idle = HZ / 125; |
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static const int cfq_target_latency = HZ * 3/10; /* 300 ms */ static const int cfq_hist_divisor = 4; |
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|
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/* |
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* offset from end of service tree |
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*/ |
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#define CFQ_IDLE_DELAY (HZ / 5) |
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/* * below this threshold, we consider thinktime immediate */ #define CFQ_MIN_TT (2) |
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#define CFQ_SLICE_SCALE (5) |
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#define CFQ_HW_QUEUE_MIN (5) |
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#define CFQ_SERVICE_SHIFT 12 |
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|
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#define CFQQ_SEEK_THR (sector_t)(8 * 100) |
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#define CFQQ_CLOSE_THR (sector_t)(8 * 1024) |
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#define CFQQ_SECT_THR_NONROT (sector_t)(2 * 32) |
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#define CFQQ_SEEKY(cfqq) (hweight32(cfqq->seek_history) > 32/8) |
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|
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#define RQ_CIC(rq) icq_to_cic((rq)->elv.icq) #define RQ_CFQQ(rq) (struct cfq_queue *) ((rq)->elv.priv[0]) #define RQ_CFQG(rq) (struct cfq_group *) ((rq)->elv.priv[1]) |
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static struct kmem_cache *cfq_pool; |
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|
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#define CFQ_PRIO_LISTS IOPRIO_BE_NR #define cfq_class_idle(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE) |
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#define cfq_class_rt(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_RT) |
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#define sample_valid(samples) ((samples) > 80) |
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#define rb_entry_cfqg(node) rb_entry((node), struct cfq_group, rb_node) |
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struct cfq_ttime { unsigned long last_end_request; unsigned long ttime_total; unsigned long ttime_samples; unsigned long ttime_mean; }; |
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/* |
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* Most of our rbtree usage is for sorting with min extraction, so * if we cache the leftmost node we don't have to walk down the tree * to find it. Idea borrowed from Ingo Molnars CFS scheduler. We should * move this into the elevator for the rq sorting as well. */ struct cfq_rb_root { struct rb_root rb; struct rb_node *left; |
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unsigned count; |
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unsigned total_weight; |
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u64 min_vdisktime; |
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struct cfq_ttime ttime; |
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}; |
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#define CFQ_RB_ROOT (struct cfq_rb_root) { .rb = RB_ROOT, \ .ttime = {.last_end_request = jiffies,},} |
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/* |
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* Per process-grouping structure */ struct cfq_queue { /* reference count */ |
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int ref; |
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/* various state flags, see below */ unsigned int flags; /* parent cfq_data */ struct cfq_data *cfqd; /* service_tree member */ struct rb_node rb_node; /* service_tree key */ unsigned long rb_key; /* prio tree member */ struct rb_node p_node; /* prio tree root we belong to, if any */ struct rb_root *p_root; /* sorted list of pending requests */ struct rb_root sort_list; /* if fifo isn't expired, next request to serve */ struct request *next_rq; /* requests queued in sort_list */ int queued[2]; /* currently allocated requests */ int allocated[2]; /* fifo list of requests in sort_list */ struct list_head fifo; |
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/* time when queue got scheduled in to dispatch first request. */ unsigned long dispatch_start; |
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unsigned int allocated_slice; |
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unsigned int slice_dispatch; |
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/* time when first request from queue completed and slice started. */ unsigned long slice_start; |
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unsigned long slice_end; long slice_resid; |
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/* pending priority requests */ int prio_pending; |
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/* number of requests that are on the dispatch list or inside driver */ int dispatched; /* io prio of this group */ unsigned short ioprio, org_ioprio; |
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unsigned short ioprio_class; |
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|
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pid_t pid; |
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u32 seek_history; |
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sector_t last_request_pos; |
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struct cfq_rb_root *service_tree; |
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struct cfq_queue *new_cfqq; |
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struct cfq_group *cfqg; |
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/* Number of sectors dispatched from queue in single dispatch round */ unsigned long nr_sectors; |
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}; /* |
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* First index in the service_trees. |
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* IDLE is handled separately, so it has negative index */ enum wl_prio_t { |
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BE_WORKLOAD = 0, |
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RT_WORKLOAD = 1, IDLE_WORKLOAD = 2, |
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CFQ_PRIO_NR, |
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}; /* |
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* Second index in the service_trees. */ enum wl_type_t { ASYNC_WORKLOAD = 0, SYNC_NOIDLE_WORKLOAD = 1, SYNC_WORKLOAD = 2 }; |
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/* This is per cgroup per device grouping structure */ struct cfq_group { |
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/* group service_tree member */ struct rb_node rb_node; /* group service_tree key */ u64 vdisktime; |
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unsigned int weight; |
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unsigned int new_weight; bool needs_update; |
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/* number of cfqq currently on this group */ int nr_cfqq; |
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/* |
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* Per group busy queues average. Useful for workload slice calc. We |
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* create the array for each prio class but at run time it is used * only for RT and BE class and slot for IDLE class remains unused. * This is primarily done to avoid confusion and a gcc warning. */ unsigned int busy_queues_avg[CFQ_PRIO_NR]; /* * rr lists of queues with requests. We maintain service trees for * RT and BE classes. These trees are subdivided in subclasses * of SYNC, SYNC_NOIDLE and ASYNC based on workload type. For IDLE * class there is no subclassification and all the cfq queues go on * a single tree service_tree_idle. |
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* Counts are embedded in the cfq_rb_root */ struct cfq_rb_root service_trees[2][3]; struct cfq_rb_root service_tree_idle; |
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unsigned long saved_workload_slice; enum wl_type_t saved_workload; enum wl_prio_t saved_serving_prio; |
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struct blkio_group blkg; #ifdef CONFIG_CFQ_GROUP_IOSCHED struct hlist_node cfqd_node; |
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int ref; |
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#endif |
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/* number of requests that are on the dispatch list or inside driver */ int dispatched; |
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struct cfq_ttime ttime; |
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}; |
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struct cfq_io_cq { struct io_cq icq; /* must be the first member */ struct cfq_queue *cfqq[2]; struct cfq_ttime ttime; }; |
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/* |
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* Per block device queue structure */ |
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struct cfq_data { |
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struct request_queue *queue; |
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/* Root service tree for cfq_groups */ struct cfq_rb_root grp_service_tree; |
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struct cfq_group root_group; |
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/* |
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* The priority currently being served |
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*/ |
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enum wl_prio_t serving_prio; |
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enum wl_type_t serving_type; unsigned long workload_expires; |
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struct cfq_group *serving_group; |
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/* * Each priority tree is sorted by next_request position. These * trees are used when determining if two or more queues are * interleaving requests (see cfq_close_cooperator). */ struct rb_root prio_trees[CFQ_PRIO_LISTS]; |
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unsigned int busy_queues; |
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unsigned int busy_sync_queues; |
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int rq_in_driver; int rq_in_flight[2]; |
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/* * queue-depth detection */ int rq_queued; |
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int hw_tag; |
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/* * hw_tag can be * -1 => indeterminate, (cfq will behave as if NCQ is present, to allow better detection) * 1 => NCQ is present (hw_tag_est_depth is the estimated max depth) * 0 => no NCQ */ int hw_tag_est_depth; unsigned int hw_tag_samples; |
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|
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/* |
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* idle window management */ struct timer_list idle_slice_timer; |
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struct work_struct unplug_work; |
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|
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struct cfq_queue *active_queue; |
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struct cfq_io_cq *active_cic; |
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/* * async queue for each priority case */ struct cfq_queue *async_cfqq[2][IOPRIO_BE_NR]; struct cfq_queue *async_idle_cfqq; |
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sector_t last_position; |
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/* * tunables, see top of file */ unsigned int cfq_quantum; |
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unsigned int cfq_fifo_expire[2]; |
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unsigned int cfq_back_penalty; unsigned int cfq_back_max; |
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unsigned int cfq_slice[2]; unsigned int cfq_slice_async_rq; unsigned int cfq_slice_idle; |
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unsigned int cfq_group_idle; |
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unsigned int cfq_latency; |
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|
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/* * Fallback dummy cfqq for extreme OOM conditions */ struct cfq_queue oom_cfqq; |
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|
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unsigned long last_delayed_sync; |
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/* List of cfq groups being managed on this device*/ struct hlist_head cfqg_list; |
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/* Number of groups which are on blkcg->blkg_list */ unsigned int nr_blkcg_linked_grps; |
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}; |
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static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd); |
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static struct cfq_rb_root *service_tree_for(struct cfq_group *cfqg, enum wl_prio_t prio, |
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enum wl_type_t type) |
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{ |
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if (!cfqg) return NULL; |
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if (prio == IDLE_WORKLOAD) |
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return &cfqg->service_tree_idle; |
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|
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return &cfqg->service_trees[prio][type]; |
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} |
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enum cfqq_state_flags { |
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CFQ_CFQQ_FLAG_on_rr = 0, /* on round-robin busy list */ CFQ_CFQQ_FLAG_wait_request, /* waiting for a request */ |
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CFQ_CFQQ_FLAG_must_dispatch, /* must be allowed a dispatch */ |
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CFQ_CFQQ_FLAG_must_alloc_slice, /* per-slice must_alloc flag */ |
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CFQ_CFQQ_FLAG_fifo_expire, /* FIFO checked in this slice */ CFQ_CFQQ_FLAG_idle_window, /* slice idling enabled */ CFQ_CFQQ_FLAG_prio_changed, /* task priority has changed */ |
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CFQ_CFQQ_FLAG_slice_new, /* no requests dispatched in slice */ |
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CFQ_CFQQ_FLAG_sync, /* synchronous queue */ |
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CFQ_CFQQ_FLAG_coop, /* cfqq is shared */ |
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CFQ_CFQQ_FLAG_split_coop, /* shared cfqq will be splitted */ |
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CFQ_CFQQ_FLAG_deep, /* sync cfqq experienced large depth */ |
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CFQ_CFQQ_FLAG_wait_busy, /* Waiting for next request */ |
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}; #define CFQ_CFQQ_FNS(name) \ static inline void cfq_mark_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
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(cfqq)->flags |= (1 << CFQ_CFQQ_FLAG_##name); \ |
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} \ static inline void cfq_clear_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
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(cfqq)->flags &= ~(1 << CFQ_CFQQ_FLAG_##name); \ |
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} \ static inline int cfq_cfqq_##name(const struct cfq_queue *cfqq) \ { \ |
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return ((cfqq)->flags & (1 << CFQ_CFQQ_FLAG_##name)) != 0; \ |
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} CFQ_CFQQ_FNS(on_rr); CFQ_CFQQ_FNS(wait_request); |
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CFQ_CFQQ_FNS(must_dispatch); |
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CFQ_CFQQ_FNS(must_alloc_slice); |
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CFQ_CFQQ_FNS(fifo_expire); CFQ_CFQQ_FNS(idle_window); CFQ_CFQQ_FNS(prio_changed); |
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CFQ_CFQQ_FNS(slice_new); |
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CFQ_CFQQ_FNS(sync); |
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CFQ_CFQQ_FNS(coop); |
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CFQ_CFQQ_FNS(split_coop); |
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CFQ_CFQQ_FNS(deep); |
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CFQ_CFQQ_FNS(wait_busy); |
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#undef CFQ_CFQQ_FNS |
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#ifdef CONFIG_CFQ_GROUP_IOSCHED |
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#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \ cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \ |
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blkg_path(&(cfqq)->cfqg->blkg), ##args) |
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#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "%s " fmt, \ |
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blkg_path(&(cfqg)->blkg), ##args) \ |
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#else |
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#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args) |
4495a7d41 CFQ: Fix typo and... |
371 |
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0) |
2868ef7b3 blkio: Some debug... |
372 |
#endif |
7b679138b cfq-iosched: add ... |
373 374 |
#define cfq_log(cfqd, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args) |
615f0259e blkio: Implement ... |
375 376 377 378 379 380 381 382 383 |
/* Traverses through cfq group service trees */ #define for_each_cfqg_st(cfqg, i, j, st) \ for (i = 0; i <= IDLE_WORKLOAD; i++) \ for (j = 0, st = i < IDLE_WORKLOAD ? &cfqg->service_trees[i][j]\ : &cfqg->service_tree_idle; \ (i < IDLE_WORKLOAD && j <= SYNC_WORKLOAD) || \ (i == IDLE_WORKLOAD && j == 0); \ j++, st = i < IDLE_WORKLOAD ? \ &cfqg->service_trees[i][j]: NULL) \ |
f5f2b6ceb CFQ: add think ti... |
384 385 386 387 388 389 390 391 392 393 394 395 |
static inline bool cfq_io_thinktime_big(struct cfq_data *cfqd, struct cfq_ttime *ttime, bool group_idle) { unsigned long slice; if (!sample_valid(ttime->ttime_samples)) return false; if (group_idle) slice = cfqd->cfq_group_idle; else slice = cfqd->cfq_slice_idle; return ttime->ttime_mean > slice; } |
615f0259e blkio: Implement ... |
396 |
|
02b35081f cfq-iosched: Do g... |
397 398 399 400 401 402 403 404 405 406 407 408 409 410 |
static inline bool iops_mode(struct cfq_data *cfqd) { /* * If we are not idling on queues and it is a NCQ drive, parallel * execution of requests is on and measuring time is not possible * in most of the cases until and unless we drive shallower queue * depths and that becomes a performance bottleneck. In such cases * switch to start providing fairness in terms of number of IOs. */ if (!cfqd->cfq_slice_idle && cfqd->hw_tag) return true; else return false; } |
c0324a020 cfq-iosched: reim... |
411 412 413 414 415 416 417 418 |
static inline enum wl_prio_t cfqq_prio(struct cfq_queue *cfqq) { if (cfq_class_idle(cfqq)) return IDLE_WORKLOAD; if (cfq_class_rt(cfqq)) return RT_WORKLOAD; return BE_WORKLOAD; } |
718eee057 cfq-iosched: fair... |
419 420 421 422 423 424 425 426 427 |
static enum wl_type_t cfqq_type(struct cfq_queue *cfqq) { if (!cfq_cfqq_sync(cfqq)) return ASYNC_WORKLOAD; if (!cfq_cfqq_idle_window(cfqq)) return SYNC_NOIDLE_WORKLOAD; return SYNC_WORKLOAD; } |
58ff82f34 blkio: Implement ... |
428 429 430 |
static inline int cfq_group_busy_queues_wl(enum wl_prio_t wl, struct cfq_data *cfqd, struct cfq_group *cfqg) |
c0324a020 cfq-iosched: reim... |
431 432 |
{ if (wl == IDLE_WORKLOAD) |
cdb16e8f7 blkio: Introduce ... |
433 |
return cfqg->service_tree_idle.count; |
c0324a020 cfq-iosched: reim... |
434 |
|
cdb16e8f7 blkio: Introduce ... |
435 436 437 |
return cfqg->service_trees[wl][ASYNC_WORKLOAD].count + cfqg->service_trees[wl][SYNC_NOIDLE_WORKLOAD].count + cfqg->service_trees[wl][SYNC_WORKLOAD].count; |
c0324a020 cfq-iosched: reim... |
438 |
} |
f26bd1f0a blkio: Determine ... |
439 440 441 442 443 444 |
static inline int cfqg_busy_async_queues(struct cfq_data *cfqd, struct cfq_group *cfqg) { return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count + cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count; } |
165125e1e [BLOCK] Get rid o... |
445 |
static void cfq_dispatch_insert(struct request_queue *, struct request *); |
a6151c3a5 cfq-iosched: appl... |
446 |
static struct cfq_queue *cfq_get_queue(struct cfq_data *, bool, |
fd0928df9 ioprio: move io p... |
447 |
struct io_context *, gfp_t); |
91fac317a cfq-iosched: get ... |
448 |
|
c58698073 block, cfq: reorg... |
449 450 451 452 453 |
static inline struct cfq_io_cq *icq_to_cic(struct io_cq *icq) { /* cic->icq is the first member, %NULL will convert to %NULL */ return container_of(icq, struct cfq_io_cq, icq); } |
47fdd4ca9 block, cfq: move ... |
454 455 456 457 458 459 460 |
static inline struct cfq_io_cq *cfq_cic_lookup(struct cfq_data *cfqd, struct io_context *ioc) { if (ioc) return icq_to_cic(ioc_lookup_icq(ioc, cfqd->queue)); return NULL; } |
c58698073 block, cfq: reorg... |
461 |
static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_cq *cic, bool is_sync) |
91fac317a cfq-iosched: get ... |
462 |
{ |
a6151c3a5 cfq-iosched: appl... |
463 |
return cic->cfqq[is_sync]; |
91fac317a cfq-iosched: get ... |
464 |
} |
c58698073 block, cfq: reorg... |
465 466 |
static inline void cic_set_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq, bool is_sync) |
91fac317a cfq-iosched: get ... |
467 |
{ |
a6151c3a5 cfq-iosched: appl... |
468 |
cic->cfqq[is_sync] = cfqq; |
91fac317a cfq-iosched: get ... |
469 |
} |
c58698073 block, cfq: reorg... |
470 |
static inline struct cfq_data *cic_to_cfqd(struct cfq_io_cq *cic) |
bca4b914b cfq-iosched: remo... |
471 |
{ |
c58698073 block, cfq: reorg... |
472 |
return cic->icq.q->elevator->elevator_data; |
bca4b914b cfq-iosched: remo... |
473 |
} |
91fac317a cfq-iosched: get ... |
474 475 476 477 |
/* * We regard a request as SYNC, if it's either a read or has the SYNC bit * set (in which case it could also be direct WRITE). */ |
a6151c3a5 cfq-iosched: appl... |
478 |
static inline bool cfq_bio_sync(struct bio *bio) |
91fac317a cfq-iosched: get ... |
479 |
{ |
7b6d91dae block: unify flag... |
480 |
return bio_data_dir(bio) == READ || (bio->bi_rw & REQ_SYNC); |
91fac317a cfq-iosched: get ... |
481 |
} |
1da177e4c Linux-2.6.12-rc2 |
482 |
|
1da177e4c Linux-2.6.12-rc2 |
483 |
/* |
99f95e528 [PATCH] cfq build... |
484 485 486 |
* scheduler run of queue, if there are requests pending and no one in the * driver that will restart queueing */ |
23e018a1b block: get rid of... |
487 |
static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) |
99f95e528 [PATCH] cfq build... |
488 |
{ |
7b679138b cfq-iosched: add ... |
489 490 |
if (cfqd->busy_queues) { cfq_log(cfqd, "schedule dispatch"); |
23e018a1b block: get rid of... |
491 |
kblockd_schedule_work(cfqd->queue, &cfqd->unplug_work); |
7b679138b cfq-iosched: add ... |
492 |
} |
99f95e528 [PATCH] cfq build... |
493 |
} |
1da177e4c Linux-2.6.12-rc2 |
494 |
/* |
44f7c1606 cfq-iosched: defe... |
495 496 497 498 |
* Scale schedule slice based on io priority. Use the sync time slice only * if a queue is marked sync and has sync io queued. A sync queue with async * io only, should not get full sync slice length. */ |
a6151c3a5 cfq-iosched: appl... |
499 |
static inline int cfq_prio_slice(struct cfq_data *cfqd, bool sync, |
d9e7620e6 cfq-iosched: rewo... |
500 |
unsigned short prio) |
44f7c1606 cfq-iosched: defe... |
501 |
{ |
d9e7620e6 cfq-iosched: rewo... |
502 |
const int base_slice = cfqd->cfq_slice[sync]; |
44f7c1606 cfq-iosched: defe... |
503 |
|
d9e7620e6 cfq-iosched: rewo... |
504 505 506 507 |
WARN_ON(prio >= IOPRIO_BE_NR); return base_slice + (base_slice/CFQ_SLICE_SCALE * (4 - prio)); } |
44f7c1606 cfq-iosched: defe... |
508 |
|
d9e7620e6 cfq-iosched: rewo... |
509 510 511 512 |
static inline int cfq_prio_to_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { return cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio); |
44f7c1606 cfq-iosched: defe... |
513 |
} |
25bc6b077 blkio: Introduce ... |
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 |
static inline u64 cfq_scale_slice(unsigned long delta, struct cfq_group *cfqg) { u64 d = delta << CFQ_SERVICE_SHIFT; d = d * BLKIO_WEIGHT_DEFAULT; do_div(d, cfqg->weight); return d; } static inline u64 max_vdisktime(u64 min_vdisktime, u64 vdisktime) { s64 delta = (s64)(vdisktime - min_vdisktime); if (delta > 0) min_vdisktime = vdisktime; return min_vdisktime; } static inline u64 min_vdisktime(u64 min_vdisktime, u64 vdisktime) { s64 delta = (s64)(vdisktime - min_vdisktime); if (delta < 0) min_vdisktime = vdisktime; return min_vdisktime; } static void update_min_vdisktime(struct cfq_rb_root *st) { |
25bc6b077 blkio: Introduce ... |
543 |
struct cfq_group *cfqg; |
25bc6b077 blkio: Introduce ... |
544 545 |
if (st->left) { cfqg = rb_entry_cfqg(st->left); |
a60327107 cfq-iosched: Fix ... |
546 547 |
st->min_vdisktime = max_vdisktime(st->min_vdisktime, cfqg->vdisktime); |
25bc6b077 blkio: Introduce ... |
548 |
} |
25bc6b077 blkio: Introduce ... |
549 |
} |
5db5d6427 cfq-iosched: adap... |
550 551 552 553 554 |
/* * get averaged number of queues of RT/BE priority. * average is updated, with a formula that gives more weight to higher numbers, * to quickly follows sudden increases and decrease slowly */ |
58ff82f34 blkio: Implement ... |
555 556 |
static inline unsigned cfq_group_get_avg_queues(struct cfq_data *cfqd, struct cfq_group *cfqg, bool rt) |
5869619cb cfq-iosched: fix ... |
557 |
{ |
5db5d6427 cfq-iosched: adap... |
558 559 560 |
unsigned min_q, max_q; unsigned mult = cfq_hist_divisor - 1; unsigned round = cfq_hist_divisor / 2; |
58ff82f34 blkio: Implement ... |
561 |
unsigned busy = cfq_group_busy_queues_wl(rt, cfqd, cfqg); |
5db5d6427 cfq-iosched: adap... |
562 |
|
58ff82f34 blkio: Implement ... |
563 564 565 |
min_q = min(cfqg->busy_queues_avg[rt], busy); max_q = max(cfqg->busy_queues_avg[rt], busy); cfqg->busy_queues_avg[rt] = (mult * max_q + min_q + round) / |
5db5d6427 cfq-iosched: adap... |
566 |
cfq_hist_divisor; |
58ff82f34 blkio: Implement ... |
567 568 569 570 571 572 573 574 575 |
return cfqg->busy_queues_avg[rt]; } static inline unsigned cfq_group_slice(struct cfq_data *cfqd, struct cfq_group *cfqg) { struct cfq_rb_root *st = &cfqd->grp_service_tree; return cfq_target_latency * cfqg->weight / st->total_weight; |
5db5d6427 cfq-iosched: adap... |
576 |
} |
c553f8e33 block cfq: compen... |
577 |
static inline unsigned |
ba5bd520f cfq: rename a fun... |
578 |
cfq_scaled_cfqq_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
579 |
{ |
5db5d6427 cfq-iosched: adap... |
580 581 |
unsigned slice = cfq_prio_to_slice(cfqd, cfqq); if (cfqd->cfq_latency) { |
58ff82f34 blkio: Implement ... |
582 583 584 585 586 587 |
/* * interested queues (we consider only the ones with the same * priority class in the cfq group) */ unsigned iq = cfq_group_get_avg_queues(cfqd, cfqq->cfqg, cfq_class_rt(cfqq)); |
5db5d6427 cfq-iosched: adap... |
588 589 |
unsigned sync_slice = cfqd->cfq_slice[1]; unsigned expect_latency = sync_slice * iq; |
58ff82f34 blkio: Implement ... |
590 591 592 |
unsigned group_slice = cfq_group_slice(cfqd, cfqq->cfqg); if (expect_latency > group_slice) { |
5db5d6427 cfq-iosched: adap... |
593 594 595 596 597 598 599 |
unsigned base_low_slice = 2 * cfqd->cfq_slice_idle; /* scale low_slice according to IO priority * and sync vs async */ unsigned low_slice = min(slice, base_low_slice * slice / sync_slice); /* the adapted slice value is scaled to fit all iqs * into the target latency */ |
58ff82f34 blkio: Implement ... |
600 |
slice = max(slice * group_slice / expect_latency, |
5db5d6427 cfq-iosched: adap... |
601 602 603 |
low_slice); } } |
c553f8e33 block cfq: compen... |
604 605 606 607 608 609 |
return slice; } static inline void cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
ba5bd520f cfq: rename a fun... |
610 |
unsigned slice = cfq_scaled_cfqq_slice(cfqd, cfqq); |
c553f8e33 block cfq: compen... |
611 |
|
dae739ebc blkio: Group time... |
612 |
cfqq->slice_start = jiffies; |
5db5d6427 cfq-iosched: adap... |
613 |
cfqq->slice_end = jiffies + slice; |
f75edf2dc blkio: Wait for c... |
614 |
cfqq->allocated_slice = slice; |
7b679138b cfq-iosched: add ... |
615 |
cfq_log_cfqq(cfqd, cfqq, "set_slice=%lu", cfqq->slice_end - jiffies); |
44f7c1606 cfq-iosched: defe... |
616 617 618 619 620 621 622 |
} /* * We need to wrap this check in cfq_cfqq_slice_new(), since ->slice_end * isn't valid until the first request from the dispatch is activated * and the slice time set. */ |
a6151c3a5 cfq-iosched: appl... |
623 |
static inline bool cfq_slice_used(struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
624 625 |
{ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
626 |
return false; |
44f7c1606 cfq-iosched: defe... |
627 |
if (time_before(jiffies, cfqq->slice_end)) |
c1e44756f cfq-iosched: do c... |
628 |
return false; |
44f7c1606 cfq-iosched: defe... |
629 |
|
c1e44756f cfq-iosched: do c... |
630 |
return true; |
44f7c1606 cfq-iosched: defe... |
631 632 633 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
634 |
* Lifted from AS - choose which of rq1 and rq2 that is best served now. |
1da177e4c Linux-2.6.12-rc2 |
635 |
* We choose the request that is closest to the head right now. Distance |
e8a99053e [PATCH] cfq-iosch... |
636 |
* behind the head is penalized and only allowed to a certain extent. |
1da177e4c Linux-2.6.12-rc2 |
637 |
*/ |
5e7053747 [PATCH] cfq-iosch... |
638 |
static struct request * |
cf7c25cf9 cfq-iosched: fix ... |
639 |
cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2, sector_t last) |
1da177e4c Linux-2.6.12-rc2 |
640 |
{ |
cf7c25cf9 cfq-iosched: fix ... |
641 |
sector_t s1, s2, d1 = 0, d2 = 0; |
1da177e4c Linux-2.6.12-rc2 |
642 |
unsigned long back_max; |
e8a99053e [PATCH] cfq-iosch... |
643 644 645 |
#define CFQ_RQ1_WRAP 0x01 /* request 1 wraps */ #define CFQ_RQ2_WRAP 0x02 /* request 2 wraps */ unsigned wrap = 0; /* bit mask: requests behind the disk head? */ |
1da177e4c Linux-2.6.12-rc2 |
646 |
|
5e7053747 [PATCH] cfq-iosch... |
647 648 649 650 |
if (rq1 == NULL || rq1 == rq2) return rq2; if (rq2 == NULL) return rq1; |
9c2c38a12 [PATCH] cfq-iosch... |
651 |
|
229836bd6 cfq-iosched: redu... |
652 653 |
if (rq_is_sync(rq1) != rq_is_sync(rq2)) return rq_is_sync(rq1) ? rq1 : rq2; |
65299a3b7 block: separate p... |
654 655 |
if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_PRIO) return rq1->cmd_flags & REQ_PRIO ? rq1 : rq2; |
b53d1ed73 Revert "cfq: Remo... |
656 |
|
83096ebf1 block: convert to... |
657 658 |
s1 = blk_rq_pos(rq1); s2 = blk_rq_pos(rq2); |
1da177e4c Linux-2.6.12-rc2 |
659 |
|
1da177e4c Linux-2.6.12-rc2 |
660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 |
/* * by definition, 1KiB is 2 sectors */ back_max = cfqd->cfq_back_max * 2; /* * Strict one way elevator _except_ in the case where we allow * short backward seeks which are biased as twice the cost of a * similar forward seek. */ if (s1 >= last) d1 = s1 - last; else if (s1 + back_max >= last) d1 = (last - s1) * cfqd->cfq_back_penalty; else |
e8a99053e [PATCH] cfq-iosch... |
675 |
wrap |= CFQ_RQ1_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
676 677 678 679 680 681 |
if (s2 >= last) d2 = s2 - last; else if (s2 + back_max >= last) d2 = (last - s2) * cfqd->cfq_back_penalty; else |
e8a99053e [PATCH] cfq-iosch... |
682 |
wrap |= CFQ_RQ2_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
683 684 |
/* Found required data */ |
e8a99053e [PATCH] cfq-iosch... |
685 686 687 688 689 690 |
/* * By doing switch() on the bit mask "wrap" we avoid having to * check two variables for all permutations: --> faster! */ switch (wrap) { |
5e7053747 [PATCH] cfq-iosch... |
691 |
case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
692 |
if (d1 < d2) |
5e7053747 [PATCH] cfq-iosch... |
693 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
694 |
else if (d2 < d1) |
5e7053747 [PATCH] cfq-iosch... |
695 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
696 697 |
else { if (s1 >= s2) |
5e7053747 [PATCH] cfq-iosch... |
698 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
699 |
else |
5e7053747 [PATCH] cfq-iosch... |
700 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
701 |
} |
1da177e4c Linux-2.6.12-rc2 |
702 |
|
e8a99053e [PATCH] cfq-iosch... |
703 |
case CFQ_RQ2_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
704 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
705 |
case CFQ_RQ1_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
706 707 |
return rq2; case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both rqs wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
708 709 710 711 712 713 714 715 |
default: /* * Since both rqs are wrapped, * start with the one that's further behind head * (--> only *one* back seek required), * since back seek takes more time than forward. */ if (s1 <= s2) |
5e7053747 [PATCH] cfq-iosch... |
716 |
return rq1; |
1da177e4c Linux-2.6.12-rc2 |
717 |
else |
5e7053747 [PATCH] cfq-iosch... |
718 |
return rq2; |
1da177e4c Linux-2.6.12-rc2 |
719 720 |
} } |
498d3aa2b [PATCH] cfq-iosch... |
721 722 723 |
/* * The below is leftmost cache rbtree addon */ |
0871714e0 cfq-iosched: rela... |
724 |
static struct cfq_queue *cfq_rb_first(struct cfq_rb_root *root) |
cc09e2990 [PATCH] cfq-iosch... |
725 |
{ |
615f0259e blkio: Implement ... |
726 727 728 |
/* Service tree is empty */ if (!root->count) return NULL; |
cc09e2990 [PATCH] cfq-iosch... |
729 730 |
if (!root->left) root->left = rb_first(&root->rb); |
0871714e0 cfq-iosched: rela... |
731 732 733 734 |
if (root->left) return rb_entry(root->left, struct cfq_queue, rb_node); return NULL; |
cc09e2990 [PATCH] cfq-iosch... |
735 |
} |
1fa8f6d68 blkio: Introduce ... |
736 737 738 739 740 741 742 743 744 745 |
static struct cfq_group *cfq_rb_first_group(struct cfq_rb_root *root) { if (!root->left) root->left = rb_first(&root->rb); if (root->left) return rb_entry_cfqg(root->left); return NULL; } |
a36e71f99 cfq-iosched: add ... |
746 747 748 749 750 |
static void rb_erase_init(struct rb_node *n, struct rb_root *root) { rb_erase(n, root); RB_CLEAR_NODE(n); } |
cc09e2990 [PATCH] cfq-iosch... |
751 752 753 754 |
static void cfq_rb_erase(struct rb_node *n, struct cfq_rb_root *root) { if (root->left == n) root->left = NULL; |
a36e71f99 cfq-iosched: add ... |
755 |
rb_erase_init(n, &root->rb); |
aa6f6a3de cfq-iosched: prep... |
756 |
--root->count; |
cc09e2990 [PATCH] cfq-iosch... |
757 |
} |
1da177e4c Linux-2.6.12-rc2 |
758 759 760 |
/* * would be nice to take fifo expire time into account as well */ |
5e7053747 [PATCH] cfq-iosch... |
761 762 763 |
static struct request * cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *last) |
1da177e4c Linux-2.6.12-rc2 |
764 |
{ |
21183b07e [PATCH] cfq-iosch... |
765 766 |
struct rb_node *rbnext = rb_next(&last->rb_node); struct rb_node *rbprev = rb_prev(&last->rb_node); |
5e7053747 [PATCH] cfq-iosch... |
767 |
struct request *next = NULL, *prev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
768 |
|
21183b07e [PATCH] cfq-iosch... |
769 |
BUG_ON(RB_EMPTY_NODE(&last->rb_node)); |
1da177e4c Linux-2.6.12-rc2 |
770 771 |
if (rbprev) |
5e7053747 [PATCH] cfq-iosch... |
772 |
prev = rb_entry_rq(rbprev); |
1da177e4c Linux-2.6.12-rc2 |
773 |
|
21183b07e [PATCH] cfq-iosch... |
774 |
if (rbnext) |
5e7053747 [PATCH] cfq-iosch... |
775 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
776 777 778 |
else { rbnext = rb_first(&cfqq->sort_list); if (rbnext && rbnext != &last->rb_node) |
5e7053747 [PATCH] cfq-iosch... |
779 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
780 |
} |
1da177e4c Linux-2.6.12-rc2 |
781 |
|
cf7c25cf9 cfq-iosched: fix ... |
782 |
return cfq_choose_req(cfqd, next, prev, blk_rq_pos(last)); |
1da177e4c Linux-2.6.12-rc2 |
783 |
} |
d9e7620e6 cfq-iosched: rewo... |
784 785 |
static unsigned long cfq_slice_offset(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
786 |
{ |
d9e7620e6 cfq-iosched: rewo... |
787 788 789 |
/* * just an approximation, should be ok. */ |
cdb16e8f7 blkio: Introduce ... |
790 |
return (cfqq->cfqg->nr_cfqq - 1) * (cfq_prio_slice(cfqd, 1, 0) - |
464191c65 Revert "cfq: Make... |
791 |
cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); |
d9e7620e6 cfq-iosched: rewo... |
792 |
} |
1fa8f6d68 blkio: Introduce ... |
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 |
static inline s64 cfqg_key(struct cfq_rb_root *st, struct cfq_group *cfqg) { return cfqg->vdisktime - st->min_vdisktime; } static void __cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) { struct rb_node **node = &st->rb.rb_node; struct rb_node *parent = NULL; struct cfq_group *__cfqg; s64 key = cfqg_key(st, cfqg); int left = 1; while (*node != NULL) { parent = *node; __cfqg = rb_entry_cfqg(parent); if (key < cfqg_key(st, __cfqg)) node = &parent->rb_left; else { node = &parent->rb_right; left = 0; } } if (left) st->left = &cfqg->rb_node; rb_link_node(&cfqg->rb_node, parent, node); rb_insert_color(&cfqg->rb_node, &st->rb); } static void |
8184f93ec cfq-iosched: Don'... |
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 |
cfq_update_group_weight(struct cfq_group *cfqg) { BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); if (cfqg->needs_update) { cfqg->weight = cfqg->new_weight; cfqg->needs_update = false; } } static void cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) { BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); cfq_update_group_weight(cfqg); __cfq_group_service_tree_add(st, cfqg); st->total_weight += cfqg->weight; } static void cfq_group_notify_queue_add(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
849 850 851 852 853 854 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; struct cfq_group *__cfqg; struct rb_node *n; cfqg->nr_cfqq++; |
760701bfe cfq-iosched: Get ... |
855 |
if (!RB_EMPTY_NODE(&cfqg->rb_node)) |
1fa8f6d68 blkio: Introduce ... |
856 857 858 859 860 |
return; /* * Currently put the group at the end. Later implement something * so that groups get lesser vtime based on their weights, so that |
25985edce Fix common misspe... |
861 |
* if group does not loose all if it was not continuously backlogged. |
1fa8f6d68 blkio: Introduce ... |
862 863 864 865 866 867 868 |
*/ n = rb_last(&st->rb); if (n) { __cfqg = rb_entry_cfqg(n); cfqg->vdisktime = __cfqg->vdisktime + CFQ_IDLE_DELAY; } else cfqg->vdisktime = st->min_vdisktime; |
8184f93ec cfq-iosched: Don'... |
869 870 |
cfq_group_service_tree_add(st, cfqg); } |
1fa8f6d68 blkio: Introduce ... |
871 |
|
8184f93ec cfq-iosched: Don'... |
872 873 874 875 876 877 |
static void cfq_group_service_tree_del(struct cfq_rb_root *st, struct cfq_group *cfqg) { st->total_weight -= cfqg->weight; if (!RB_EMPTY_NODE(&cfqg->rb_node)) cfq_rb_erase(&cfqg->rb_node, st); |
1fa8f6d68 blkio: Introduce ... |
878 879 880 |
} static void |
8184f93ec cfq-iosched: Don'... |
881 |
cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
882 883 884 885 886 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; BUG_ON(cfqg->nr_cfqq < 1); cfqg->nr_cfqq--; |
25bc6b077 blkio: Introduce ... |
887 |
|
1fa8f6d68 blkio: Introduce ... |
888 889 890 |
/* If there are other cfq queues under this group, don't delete it */ if (cfqg->nr_cfqq) return; |
2868ef7b3 blkio: Some debug... |
891 |
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group"); |
8184f93ec cfq-iosched: Don'... |
892 |
cfq_group_service_tree_del(st, cfqg); |
dae739ebc blkio: Group time... |
893 |
cfqg->saved_workload_slice = 0; |
e98ef89b3 cfq-iosched: Fixe... |
894 |
cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1); |
dae739ebc blkio: Group time... |
895 |
} |
167400d34 blk-cgroup: Add u... |
896 897 |
static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq, unsigned int *unaccounted_time) |
dae739ebc blkio: Group time... |
898 |
{ |
f75edf2dc blkio: Wait for c... |
899 |
unsigned int slice_used; |
dae739ebc blkio: Group time... |
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 |
/* * Queue got expired before even a single request completed or * got expired immediately after first request completion. */ if (!cfqq->slice_start || cfqq->slice_start == jiffies) { /* * Also charge the seek time incurred to the group, otherwise * if there are mutiple queues in the group, each can dispatch * a single request on seeky media and cause lots of seek time * and group will never know it. */ slice_used = max_t(unsigned, (jiffies - cfqq->dispatch_start), 1); } else { slice_used = jiffies - cfqq->slice_start; |
167400d34 blk-cgroup: Add u... |
916 917 |
if (slice_used > cfqq->allocated_slice) { *unaccounted_time = slice_used - cfqq->allocated_slice; |
f75edf2dc blkio: Wait for c... |
918 |
slice_used = cfqq->allocated_slice; |
167400d34 blk-cgroup: Add u... |
919 920 921 922 |
} if (time_after(cfqq->slice_start, cfqq->dispatch_start)) *unaccounted_time += cfqq->slice_start - cfqq->dispatch_start; |
dae739ebc blkio: Group time... |
923 |
} |
dae739ebc blkio: Group time... |
924 925 926 927 |
return slice_used; } static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, |
e5ff082e8 blkio: Fix anothe... |
928 |
struct cfq_queue *cfqq) |
dae739ebc blkio: Group time... |
929 930 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; |
167400d34 blk-cgroup: Add u... |
931 |
unsigned int used_sl, charge, unaccounted_sl = 0; |
f26bd1f0a blkio: Determine ... |
932 933 934 935 |
int nr_sync = cfqg->nr_cfqq - cfqg_busy_async_queues(cfqd, cfqg) - cfqg->service_tree_idle.count; BUG_ON(nr_sync < 0); |
167400d34 blk-cgroup: Add u... |
936 |
used_sl = charge = cfq_cfqq_slice_usage(cfqq, &unaccounted_sl); |
dae739ebc blkio: Group time... |
937 |
|
02b35081f cfq-iosched: Do g... |
938 939 940 941 |
if (iops_mode(cfqd)) charge = cfqq->slice_dispatch; else if (!cfq_cfqq_sync(cfqq) && !nr_sync) charge = cfqq->allocated_slice; |
dae739ebc blkio: Group time... |
942 943 |
/* Can't update vdisktime while group is on service tree */ |
8184f93ec cfq-iosched: Don'... |
944 |
cfq_group_service_tree_del(st, cfqg); |
02b35081f cfq-iosched: Do g... |
945 |
cfqg->vdisktime += cfq_scale_slice(charge, cfqg); |
8184f93ec cfq-iosched: Don'... |
946 947 |
/* If a new weight was requested, update now, off tree */ cfq_group_service_tree_add(st, cfqg); |
dae739ebc blkio: Group time... |
948 949 950 951 952 953 954 955 956 |
/* This group is being expired. Save the context */ if (time_after(cfqd->workload_expires, jiffies)) { cfqg->saved_workload_slice = cfqd->workload_expires - jiffies; cfqg->saved_workload = cfqd->serving_type; cfqg->saved_serving_prio = cfqd->serving_prio; } else cfqg->saved_workload_slice = 0; |
2868ef7b3 blkio: Some debug... |
957 958 959 |
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime, st->min_vdisktime); |
fd16d2631 block: Add __attr... |
960 961 962 963 |
cfq_log_cfqq(cfqq->cfqd, cfqq, "sl_used=%u disp=%u charge=%u iops=%u sect=%lu", used_sl, cfqq->slice_dispatch, charge, iops_mode(cfqd), cfqq->nr_sectors); |
167400d34 blk-cgroup: Add u... |
964 965 |
cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl, unaccounted_sl); |
e98ef89b3 cfq-iosched: Fixe... |
966 |
cfq_blkiocg_set_start_empty_time(&cfqg->blkg); |
1fa8f6d68 blkio: Introduce ... |
967 |
} |
25fb5169d blkio: Dynamic cf... |
968 969 970 971 972 973 974 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED static inline struct cfq_group *cfqg_of_blkg(struct blkio_group *blkg) { if (blkg) return container_of(blkg, struct cfq_group, blkg); return NULL; } |
8aea45451 CFQ: make two fun... |
975 976 |
static void cfq_update_blkio_group_weight(void *key, struct blkio_group *blkg, unsigned int weight) |
f8d461d69 blkio: Propagate ... |
977 |
{ |
8184f93ec cfq-iosched: Don'... |
978 979 980 |
struct cfq_group *cfqg = cfqg_of_blkg(blkg); cfqg->new_weight = weight; cfqg->needs_update = true; |
f8d461d69 blkio: Propagate ... |
981 |
} |
f469a7b4d blk-cgroup: Allow... |
982 983 |
static void cfq_init_add_cfqg_lists(struct cfq_data *cfqd, struct cfq_group *cfqg, struct blkio_cgroup *blkcg) |
25fb5169d blkio: Dynamic cf... |
984 |
{ |
220841906 blkio: Export dis... |
985 986 |
struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info; unsigned int major, minor; |
25fb5169d blkio: Dynamic cf... |
987 |
|
f469a7b4d blk-cgroup: Allow... |
988 989 990 991 992 993 994 |
/* * Add group onto cgroup list. It might happen that bdi->dev is * not initialized yet. Initialize this new group without major * and minor info and this info will be filled in once a new thread * comes for IO. */ if (bdi->dev) { |
a74b2adae block: expose the... |
995 |
sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor); |
f469a7b4d blk-cgroup: Allow... |
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 |
cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd, MKDEV(major, minor)); } else cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd, 0); cfqd->nr_blkcg_linked_grps++; cfqg->weight = blkcg_get_weight(blkcg, cfqg->blkg.dev); /* Add group on cfqd list */ hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); } /* * Should be called from sleepable context. No request queue lock as per * cpu stats are allocated dynamically and alloc_percpu needs to be called * from sleepable context. */ static struct cfq_group * cfq_alloc_cfqg(struct cfq_data *cfqd) { struct cfq_group *cfqg = NULL; |
5624a4e44 blk-throttle: Mak... |
1017 |
int i, j, ret; |
f469a7b4d blk-cgroup: Allow... |
1018 |
struct cfq_rb_root *st; |
25fb5169d blkio: Dynamic cf... |
1019 1020 1021 |
cfqg = kzalloc_node(sizeof(*cfqg), GFP_ATOMIC, cfqd->queue->node); if (!cfqg) |
f469a7b4d blk-cgroup: Allow... |
1022 |
return NULL; |
25fb5169d blkio: Dynamic cf... |
1023 |
|
25fb5169d blkio: Dynamic cf... |
1024 1025 1026 |
for_each_cfqg_st(cfqg, i, j, st) *st = CFQ_RB_ROOT; RB_CLEAR_NODE(&cfqg->rb_node); |
7700fc4f6 CFQ: add think ti... |
1027 |
cfqg->ttime.last_end_request = jiffies; |
b1c357696 blkio: Take care ... |
1028 1029 1030 1031 1032 1033 |
/* * Take the initial reference that will be released on destroy * This can be thought of a joint reference by cgroup and * elevator which will be dropped by either elevator exit * or cgroup deletion path depending on who is exiting first. */ |
329a67815 block cfq: don't ... |
1034 |
cfqg->ref = 1; |
5624a4e44 blk-throttle: Mak... |
1035 1036 1037 1038 1039 1040 |
ret = blkio_alloc_blkg_stats(&cfqg->blkg); if (ret) { kfree(cfqg); return NULL; } |
f469a7b4d blk-cgroup: Allow... |
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 |
return cfqg; } static struct cfq_group * cfq_find_cfqg(struct cfq_data *cfqd, struct blkio_cgroup *blkcg) { struct cfq_group *cfqg = NULL; void *key = cfqd; struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info; unsigned int major, minor; |
b1c357696 blkio: Take care ... |
1051 |
|
180be2a04 cfq-iosched: fix ... |
1052 |
/* |
f469a7b4d blk-cgroup: Allow... |
1053 1054 |
* This is the common case when there are no blkio cgroups. * Avoid lookup in this case |
180be2a04 cfq-iosched: fix ... |
1055 |
*/ |
f469a7b4d blk-cgroup: Allow... |
1056 1057 1058 1059 |
if (blkcg == &blkio_root_cgroup) cfqg = &cfqd->root_group; else cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key)); |
25fb5169d blkio: Dynamic cf... |
1060 |
|
f469a7b4d blk-cgroup: Allow... |
1061 1062 1063 1064 |
if (cfqg && !cfqg->blkg.dev && bdi->dev && dev_name(bdi->dev)) { sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor); cfqg->blkg.dev = MKDEV(major, minor); } |
25fb5169d blkio: Dynamic cf... |
1065 |
|
25fb5169d blkio: Dynamic cf... |
1066 1067 1068 1069 |
return cfqg; } /* |
3e59cf9d6 cfq-iosched: Get ... |
1070 1071 |
* Search for the cfq group current task belongs to. request_queue lock must * be held. |
25fb5169d blkio: Dynamic cf... |
1072 |
*/ |
3e59cf9d6 cfq-iosched: Get ... |
1073 |
static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd) |
25fb5169d blkio: Dynamic cf... |
1074 |
{ |
70087dc38 blk-throttle: Use... |
1075 |
struct blkio_cgroup *blkcg; |
f469a7b4d blk-cgroup: Allow... |
1076 1077 |
struct cfq_group *cfqg = NULL, *__cfqg = NULL; struct request_queue *q = cfqd->queue; |
25fb5169d blkio: Dynamic cf... |
1078 1079 |
rcu_read_lock(); |
70087dc38 blk-throttle: Use... |
1080 |
blkcg = task_blkio_cgroup(current); |
f469a7b4d blk-cgroup: Allow... |
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 |
cfqg = cfq_find_cfqg(cfqd, blkcg); if (cfqg) { rcu_read_unlock(); return cfqg; } /* * Need to allocate a group. Allocation of group also needs allocation * of per cpu stats which in-turn takes a mutex() and can block. Hence * we need to drop rcu lock and queue_lock before we call alloc. * * Not taking any queue reference here and assuming that queue is * around by the time we return. CFQ queue allocation code does * the same. It might be racy though. */ rcu_read_unlock(); spin_unlock_irq(q->queue_lock); cfqg = cfq_alloc_cfqg(cfqd); spin_lock_irq(q->queue_lock); rcu_read_lock(); blkcg = task_blkio_cgroup(current); /* * If some other thread already allocated the group while we were * not holding queue lock, free up the group */ __cfqg = cfq_find_cfqg(cfqd, blkcg); if (__cfqg) { kfree(cfqg); rcu_read_unlock(); return __cfqg; } |
3e59cf9d6 cfq-iosched: Get ... |
1118 |
if (!cfqg) |
25fb5169d blkio: Dynamic cf... |
1119 |
cfqg = &cfqd->root_group; |
f469a7b4d blk-cgroup: Allow... |
1120 1121 |
cfq_init_add_cfqg_lists(cfqd, cfqg, blkcg); |
25fb5169d blkio: Dynamic cf... |
1122 1123 1124 |
rcu_read_unlock(); return cfqg; } |
7f1dc8a2d blkio: Fix blkio ... |
1125 1126 |
static inline struct cfq_group *cfq_ref_get_cfqg(struct cfq_group *cfqg) { |
329a67815 block cfq: don't ... |
1127 |
cfqg->ref++; |
7f1dc8a2d blkio: Fix blkio ... |
1128 1129 |
return cfqg; } |
25fb5169d blkio: Dynamic cf... |
1130 1131 1132 1133 1134 1135 1136 |
static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { /* Currently, all async queues are mapped to root group */ if (!cfq_cfqq_sync(cfqq)) cfqg = &cfqq->cfqd->root_group; cfqq->cfqg = cfqg; |
b1c357696 blkio: Take care ... |
1137 |
/* cfqq reference on cfqg */ |
329a67815 block cfq: don't ... |
1138 |
cfqq->cfqg->ref++; |
b1c357696 blkio: Take care ... |
1139 1140 1141 1142 1143 1144 |
} static void cfq_put_cfqg(struct cfq_group *cfqg) { struct cfq_rb_root *st; int i, j; |
329a67815 block cfq: don't ... |
1145 1146 1147 |
BUG_ON(cfqg->ref <= 0); cfqg->ref--; if (cfqg->ref) |
b1c357696 blkio: Take care ... |
1148 1149 |
return; for_each_cfqg_st(cfqg, i, j, st) |
b54ce60eb cfq-iosched: Get ... |
1150 |
BUG_ON(!RB_EMPTY_ROOT(&st->rb)); |
5624a4e44 blk-throttle: Mak... |
1151 |
free_percpu(cfqg->blkg.stats_cpu); |
b1c357696 blkio: Take care ... |
1152 1153 1154 1155 1156 1157 1158 1159 1160 |
kfree(cfqg); } static void cfq_destroy_cfqg(struct cfq_data *cfqd, struct cfq_group *cfqg) { /* Something wrong if we are trying to remove same group twice */ BUG_ON(hlist_unhashed(&cfqg->cfqd_node)); hlist_del_init(&cfqg->cfqd_node); |
a5395b83b cfq-iosched: Redu... |
1161 1162 |
BUG_ON(cfqd->nr_blkcg_linked_grps <= 0); cfqd->nr_blkcg_linked_grps--; |
b1c357696 blkio: Take care ... |
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 |
/* * Put the reference taken at the time of creation so that when all * queues are gone, group can be destroyed. */ cfq_put_cfqg(cfqg); } static void cfq_release_cfq_groups(struct cfq_data *cfqd) { struct hlist_node *pos, *n; struct cfq_group *cfqg; hlist_for_each_entry_safe(cfqg, pos, n, &cfqd->cfqg_list, cfqd_node) { /* * If cgroup removal path got to blk_group first and removed * it from cgroup list, then it will take care of destroying * cfqg also. */ |
e98ef89b3 cfq-iosched: Fixe... |
1181 |
if (!cfq_blkiocg_del_blkio_group(&cfqg->blkg)) |
b1c357696 blkio: Take care ... |
1182 1183 |
cfq_destroy_cfqg(cfqd, cfqg); } |
25fb5169d blkio: Dynamic cf... |
1184 |
} |
b1c357696 blkio: Take care ... |
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 |
/* * Blk cgroup controller notification saying that blkio_group object is being * delinked as associated cgroup object is going away. That also means that * no new IO will come in this group. So get rid of this group as soon as * any pending IO in the group is finished. * * This function is called under rcu_read_lock(). key is the rcu protected * pointer. That means "key" is a valid cfq_data pointer as long as we are rcu * read lock. * * "key" was fetched from blkio_group under blkio_cgroup->lock. That means * it should not be NULL as even if elevator was exiting, cgroup deltion * path got to it first. */ |
8aea45451 CFQ: make two fun... |
1200 |
static void cfq_unlink_blkio_group(void *key, struct blkio_group *blkg) |
b1c357696 blkio: Take care ... |
1201 1202 1203 1204 1205 1206 1207 1208 |
{ unsigned long flags; struct cfq_data *cfqd = key; spin_lock_irqsave(cfqd->queue->queue_lock, flags); cfq_destroy_cfqg(cfqd, cfqg_of_blkg(blkg)); spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
25fb5169d blkio: Dynamic cf... |
1209 |
#else /* GROUP_IOSCHED */ |
3e59cf9d6 cfq-iosched: Get ... |
1210 |
static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd) |
25fb5169d blkio: Dynamic cf... |
1211 1212 1213 |
{ return &cfqd->root_group; } |
7f1dc8a2d blkio: Fix blkio ... |
1214 1215 1216 |
static inline struct cfq_group *cfq_ref_get_cfqg(struct cfq_group *cfqg) { |
50eaeb323 cfq-iosched: fix ... |
1217 |
return cfqg; |
7f1dc8a2d blkio: Fix blkio ... |
1218 |
} |
25fb5169d blkio: Dynamic cf... |
1219 1220 1221 1222 |
static inline void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { cfqq->cfqg = cfqg; } |
b1c357696 blkio: Take care ... |
1223 1224 |
static void cfq_release_cfq_groups(struct cfq_data *cfqd) {} static inline void cfq_put_cfqg(struct cfq_group *cfqg) {} |
25fb5169d blkio: Dynamic cf... |
1225 |
#endif /* GROUP_IOSCHED */ |
498d3aa2b [PATCH] cfq-iosch... |
1226 |
/* |
c0324a020 cfq-iosched: reim... |
1227 |
* The cfqd->service_trees holds all pending cfq_queue's that have |
498d3aa2b [PATCH] cfq-iosch... |
1228 1229 1230 |
* requests waiting to be processed. It is sorted in the order that * we will service the queues. */ |
a36e71f99 cfq-iosched: add ... |
1231 |
static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
1232 |
bool add_front) |
d9e7620e6 cfq-iosched: rewo... |
1233 |
{ |
0871714e0 cfq-iosched: rela... |
1234 1235 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
d9e7620e6 cfq-iosched: rewo... |
1236 |
unsigned long rb_key; |
c0324a020 cfq-iosched: reim... |
1237 |
struct cfq_rb_root *service_tree; |
498d3aa2b [PATCH] cfq-iosch... |
1238 |
int left; |
dae739ebc blkio: Group time... |
1239 |
int new_cfqq = 1; |
ae30c2865 blkio: Implement ... |
1240 |
|
cdb16e8f7 blkio: Introduce ... |
1241 |
service_tree = service_tree_for(cfqq->cfqg, cfqq_prio(cfqq), |
65b32a573 cfq-iosched: Remo... |
1242 |
cfqq_type(cfqq)); |
0871714e0 cfq-iosched: rela... |
1243 1244 |
if (cfq_class_idle(cfqq)) { rb_key = CFQ_IDLE_DELAY; |
aa6f6a3de cfq-iosched: prep... |
1245 |
parent = rb_last(&service_tree->rb); |
0871714e0 cfq-iosched: rela... |
1246 1247 1248 1249 1250 1251 |
if (parent && parent != &cfqq->rb_node) { __cfqq = rb_entry(parent, struct cfq_queue, rb_node); rb_key += __cfqq->rb_key; } else rb_key += jiffies; } else if (!add_front) { |
b9c8946b1 cfq-iosched: fix ... |
1252 1253 1254 1255 1256 1257 |
/* * Get our rb key offset. Subtract any residual slice * value carried from last service. A negative resid * count indicates slice overrun, and this should position * the next service time further away in the tree. */ |
edd75ffd9 cfq-iosched: get ... |
1258 |
rb_key = cfq_slice_offset(cfqd, cfqq) + jiffies; |
b9c8946b1 cfq-iosched: fix ... |
1259 |
rb_key -= cfqq->slice_resid; |
edd75ffd9 cfq-iosched: get ... |
1260 |
cfqq->slice_resid = 0; |
48e025e63 cfq-iosched: fix ... |
1261 1262 |
} else { rb_key = -HZ; |
aa6f6a3de cfq-iosched: prep... |
1263 |
__cfqq = cfq_rb_first(service_tree); |
48e025e63 cfq-iosched: fix ... |
1264 1265 |
rb_key += __cfqq ? __cfqq->rb_key : jiffies; } |
1da177e4c Linux-2.6.12-rc2 |
1266 |
|
d9e7620e6 cfq-iosched: rewo... |
1267 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { |
dae739ebc blkio: Group time... |
1268 |
new_cfqq = 0; |
99f9628ab [PATCH] cfq-iosch... |
1269 |
/* |
d9e7620e6 cfq-iosched: rewo... |
1270 |
* same position, nothing more to do |
99f9628ab [PATCH] cfq-iosch... |
1271 |
*/ |
c0324a020 cfq-iosched: reim... |
1272 1273 |
if (rb_key == cfqq->rb_key && cfqq->service_tree == service_tree) |
d9e7620e6 cfq-iosched: rewo... |
1274 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1275 |
|
aa6f6a3de cfq-iosched: prep... |
1276 1277 |
cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1278 |
} |
d9e7620e6 cfq-iosched: rewo... |
1279 |
|
498d3aa2b [PATCH] cfq-iosch... |
1280 |
left = 1; |
0871714e0 cfq-iosched: rela... |
1281 |
parent = NULL; |
aa6f6a3de cfq-iosched: prep... |
1282 1283 |
cfqq->service_tree = service_tree; p = &service_tree->rb.rb_node; |
d9e7620e6 cfq-iosched: rewo... |
1284 |
while (*p) { |
67060e379 cfq-iosched: sort... |
1285 |
struct rb_node **n; |
cc09e2990 [PATCH] cfq-iosch... |
1286 |
|
d9e7620e6 cfq-iosched: rewo... |
1287 1288 |
parent = *p; __cfqq = rb_entry(parent, struct cfq_queue, rb_node); |
0c534e0a4 cfq-iosched: sort... |
1289 |
/* |
c0324a020 cfq-iosched: reim... |
1290 |
* sort by key, that represents service time. |
0c534e0a4 cfq-iosched: sort... |
1291 |
*/ |
c0324a020 cfq-iosched: reim... |
1292 |
if (time_before(rb_key, __cfqq->rb_key)) |
67060e379 cfq-iosched: sort... |
1293 |
n = &(*p)->rb_left; |
c0324a020 cfq-iosched: reim... |
1294 |
else { |
67060e379 cfq-iosched: sort... |
1295 |
n = &(*p)->rb_right; |
cc09e2990 [PATCH] cfq-iosch... |
1296 |
left = 0; |
c0324a020 cfq-iosched: reim... |
1297 |
} |
67060e379 cfq-iosched: sort... |
1298 1299 |
p = n; |
d9e7620e6 cfq-iosched: rewo... |
1300 |
} |
cc09e2990 [PATCH] cfq-iosch... |
1301 |
if (left) |
aa6f6a3de cfq-iosched: prep... |
1302 |
service_tree->left = &cfqq->rb_node; |
cc09e2990 [PATCH] cfq-iosch... |
1303 |
|
d9e7620e6 cfq-iosched: rewo... |
1304 1305 |
cfqq->rb_key = rb_key; rb_link_node(&cfqq->rb_node, parent, p); |
aa6f6a3de cfq-iosched: prep... |
1306 1307 |
rb_insert_color(&cfqq->rb_node, &service_tree->rb); service_tree->count++; |
20359f27e cfq-iosched: remo... |
1308 |
if (add_front || !new_cfqq) |
dae739ebc blkio: Group time... |
1309 |
return; |
8184f93ec cfq-iosched: Don'... |
1310 |
cfq_group_notify_queue_add(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
1311 |
} |
a36e71f99 cfq-iosched: add ... |
1312 |
static struct cfq_queue * |
f2d1f0ae7 cfq-iosched: cach... |
1313 1314 1315 |
cfq_prio_tree_lookup(struct cfq_data *cfqd, struct rb_root *root, sector_t sector, struct rb_node **ret_parent, struct rb_node ***rb_link) |
a36e71f99 cfq-iosched: add ... |
1316 |
{ |
a36e71f99 cfq-iosched: add ... |
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 |
struct rb_node **p, *parent; struct cfq_queue *cfqq = NULL; parent = NULL; p = &root->rb_node; while (*p) { struct rb_node **n; parent = *p; cfqq = rb_entry(parent, struct cfq_queue, p_node); /* * Sort strictly based on sector. Smallest to the left, * largest to the right. */ |
2e46e8b27 block: drop reque... |
1332 |
if (sector > blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1333 |
n = &(*p)->rb_right; |
2e46e8b27 block: drop reque... |
1334 |
else if (sector < blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1335 1336 1337 1338 |
n = &(*p)->rb_left; else break; p = n; |
3ac6c9f8a cfq-iosched: fix ... |
1339 |
cfqq = NULL; |
a36e71f99 cfq-iosched: add ... |
1340 1341 1342 1343 1344 |
} *ret_parent = parent; if (rb_link) *rb_link = p; |
3ac6c9f8a cfq-iosched: fix ... |
1345 |
return cfqq; |
a36e71f99 cfq-iosched: add ... |
1346 1347 1348 1349 |
} static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
a36e71f99 cfq-iosched: add ... |
1350 1351 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
f2d1f0ae7 cfq-iosched: cach... |
1352 1353 1354 1355 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
a36e71f99 cfq-iosched: add ... |
1356 1357 1358 1359 1360 |
if (cfq_class_idle(cfqq)) return; if (!cfqq->next_rq) return; |
f2d1f0ae7 cfq-iosched: cach... |
1361 |
cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio]; |
2e46e8b27 block: drop reque... |
1362 1363 |
__cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, blk_rq_pos(cfqq->next_rq), &parent, &p); |
3ac6c9f8a cfq-iosched: fix ... |
1364 1365 |
if (!__cfqq) { rb_link_node(&cfqq->p_node, parent, p); |
f2d1f0ae7 cfq-iosched: cach... |
1366 1367 1368 |
rb_insert_color(&cfqq->p_node, cfqq->p_root); } else cfqq->p_root = NULL; |
a36e71f99 cfq-iosched: add ... |
1369 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1370 1371 1372 |
/* * Update cfqq's position in the service tree. */ |
edd75ffd9 cfq-iosched: get ... |
1373 |
static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
1374 |
{ |
6d048f531 cfq-iosched: deve... |
1375 1376 1377 |
/* * Resorting requires the cfqq to be on the RR list already. */ |
a36e71f99 cfq-iosched: add ... |
1378 |
if (cfq_cfqq_on_rr(cfqq)) { |
edd75ffd9 cfq-iosched: get ... |
1379 |
cfq_service_tree_add(cfqd, cfqq, 0); |
a36e71f99 cfq-iosched: add ... |
1380 1381 |
cfq_prio_tree_add(cfqd, cfqq); } |
6d048f531 cfq-iosched: deve... |
1382 |
} |
1da177e4c Linux-2.6.12-rc2 |
1383 1384 |
/* * add to busy list of queues for service, trying to be fair in ordering |
22e2c507c [PATCH] Update cf... |
1385 |
* the pending list according to last request service |
1da177e4c Linux-2.6.12-rc2 |
1386 |
*/ |
febffd618 cfq-iosched: kill... |
1387 |
static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1388 |
{ |
7b679138b cfq-iosched: add ... |
1389 |
cfq_log_cfqq(cfqd, cfqq, "add_to_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
1390 1391 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1392 |
cfqd->busy_queues++; |
ef8a41df8 cfq-iosched: give... |
1393 1394 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues++; |
1da177e4c Linux-2.6.12-rc2 |
1395 |
|
edd75ffd9 cfq-iosched: get ... |
1396 |
cfq_resort_rr_list(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1397 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1398 1399 1400 1401 |
/* * Called when the cfqq no longer has requests pending, remove it from * the service tree. */ |
febffd618 cfq-iosched: kill... |
1402 |
static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1403 |
{ |
7b679138b cfq-iosched: add ... |
1404 |
cfq_log_cfqq(cfqd, cfqq, "del_from_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
1405 1406 |
BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1407 |
|
aa6f6a3de cfq-iosched: prep... |
1408 1409 1410 1411 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; } |
f2d1f0ae7 cfq-iosched: cach... |
1412 1413 1414 1415 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
d9e7620e6 cfq-iosched: rewo... |
1416 |
|
8184f93ec cfq-iosched: Don'... |
1417 |
cfq_group_notify_queue_del(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
1418 1419 |
BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; |
ef8a41df8 cfq-iosched: give... |
1420 1421 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues--; |
1da177e4c Linux-2.6.12-rc2 |
1422 1423 1424 1425 1426 |
} /* * rb tree support functions */ |
febffd618 cfq-iosched: kill... |
1427 |
static void cfq_del_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1428 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1429 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
5e7053747 [PATCH] cfq-iosch... |
1430 |
const int sync = rq_is_sync(rq); |
1da177e4c Linux-2.6.12-rc2 |
1431 |
|
b4878f245 [PATCH] 02/05: up... |
1432 1433 |
BUG_ON(!cfqq->queued[sync]); cfqq->queued[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
1434 |
|
5e7053747 [PATCH] cfq-iosch... |
1435 |
elv_rb_del(&cfqq->sort_list, rq); |
1da177e4c Linux-2.6.12-rc2 |
1436 |
|
f04a64246 blkio: Keep queue... |
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) { /* * Queue will be deleted from service tree when we actually * expire it later. Right now just remove it from prio tree * as it is empty. */ if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } } |
1da177e4c Linux-2.6.12-rc2 |
1448 |
} |
5e7053747 [PATCH] cfq-iosch... |
1449 |
static void cfq_add_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1450 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1451 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
1452 |
struct cfq_data *cfqd = cfqq->cfqd; |
796d5116c iosched: prevent ... |
1453 |
struct request *prev; |
1da177e4c Linux-2.6.12-rc2 |
1454 |
|
5380a101d [PATCH] cfq-iosch... |
1455 |
cfqq->queued[rq_is_sync(rq)]++; |
1da177e4c Linux-2.6.12-rc2 |
1456 |
|
796d5116c iosched: prevent ... |
1457 |
elv_rb_add(&cfqq->sort_list, rq); |
5fccbf61b [PATCH] CFQ: requ... |
1458 1459 1460 |
if (!cfq_cfqq_on_rr(cfqq)) cfq_add_cfqq_rr(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
1461 1462 1463 1464 |
/* * check if this request is a better next-serve candidate */ |
a36e71f99 cfq-iosched: add ... |
1465 |
prev = cfqq->next_rq; |
cf7c25cf9 cfq-iosched: fix ... |
1466 |
cfqq->next_rq = cfq_choose_req(cfqd, cfqq->next_rq, rq, cfqd->last_position); |
a36e71f99 cfq-iosched: add ... |
1467 1468 1469 1470 1471 1472 |
/* * adjust priority tree position, if ->next_rq changes */ if (prev != cfqq->next_rq) cfq_prio_tree_add(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
1473 |
BUG_ON(!cfqq->next_rq); |
1da177e4c Linux-2.6.12-rc2 |
1474 |
} |
febffd618 cfq-iosched: kill... |
1475 |
static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1476 |
{ |
5380a101d [PATCH] cfq-iosch... |
1477 1478 |
elv_rb_del(&cfqq->sort_list, rq); cfqq->queued[rq_is_sync(rq)]--; |
e98ef89b3 cfq-iosched: Fixe... |
1479 1480 |
cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
5e7053747 [PATCH] cfq-iosch... |
1481 |
cfq_add_rq_rb(rq); |
e98ef89b3 cfq-iosched: Fixe... |
1482 |
cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg, |
7f1dc8a2d blkio: Fix blkio ... |
1483 1484 |
&cfqq->cfqd->serving_group->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
1da177e4c Linux-2.6.12-rc2 |
1485 |
} |
206dc69b3 [BLOCK] cfq-iosch... |
1486 1487 |
static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1488 |
{ |
206dc69b3 [BLOCK] cfq-iosch... |
1489 |
struct task_struct *tsk = current; |
c58698073 block, cfq: reorg... |
1490 |
struct cfq_io_cq *cic; |
206dc69b3 [BLOCK] cfq-iosch... |
1491 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
1492 |
|
4ac845a2e block: cfq: make ... |
1493 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
1494 1495 1496 1497 |
if (!cic) return NULL; cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
89850f7ee [PATCH] cfq-iosch... |
1498 1499 |
if (cfqq) { sector_t sector = bio->bi_sector + bio_sectors(bio); |
21183b07e [PATCH] cfq-iosch... |
1500 |
return elv_rb_find(&cfqq->sort_list, sector); |
89850f7ee [PATCH] cfq-iosch... |
1501 |
} |
1da177e4c Linux-2.6.12-rc2 |
1502 |
|
1da177e4c Linux-2.6.12-rc2 |
1503 1504 |
return NULL; } |
165125e1e [BLOCK] Get rid o... |
1505 |
static void cfq_activate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1506 |
{ |
22e2c507c [PATCH] Update cf... |
1507 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
1508 |
|
53c583d22 cfq-iosched: requ... |
1509 |
cfqd->rq_in_driver++; |
7b679138b cfq-iosched: add ... |
1510 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
1511 |
cfqd->rq_in_driver); |
25776e359 [PATCH] cfq-iosch... |
1512 |
|
5b93629b4 block: implement ... |
1513 |
cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq); |
1da177e4c Linux-2.6.12-rc2 |
1514 |
} |
165125e1e [BLOCK] Get rid o... |
1515 |
static void cfq_deactivate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1516 |
{ |
b4878f245 [PATCH] 02/05: up... |
1517 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
53c583d22 cfq-iosched: requ... |
1518 1519 |
WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; |
7b679138b cfq-iosched: add ... |
1520 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
1521 |
cfqd->rq_in_driver); |
1da177e4c Linux-2.6.12-rc2 |
1522 |
} |
b4878f245 [PATCH] 02/05: up... |
1523 |
static void cfq_remove_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1524 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1525 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
21183b07e [PATCH] cfq-iosch... |
1526 |
|
5e7053747 [PATCH] cfq-iosch... |
1527 1528 |
if (cfqq->next_rq == rq) cfqq->next_rq = cfq_find_next_rq(cfqq->cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
1529 |
|
b4878f245 [PATCH] 02/05: up... |
1530 |
list_del_init(&rq->queuelist); |
5e7053747 [PATCH] cfq-iosch... |
1531 |
cfq_del_rq_rb(rq); |
374f84ac3 [PATCH] cfq-iosch... |
1532 |
|
45333d5a3 cfq-iosched: fix ... |
1533 |
cfqq->cfqd->rq_queued--; |
e98ef89b3 cfq-iosched: Fixe... |
1534 1535 |
cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
65299a3b7 block: separate p... |
1536 1537 1538 |
if (rq->cmd_flags & REQ_PRIO) { WARN_ON(!cfqq->prio_pending); cfqq->prio_pending--; |
b53d1ed73 Revert "cfq: Remo... |
1539 |
} |
1da177e4c Linux-2.6.12-rc2 |
1540 |
} |
165125e1e [BLOCK] Get rid o... |
1541 1542 |
static int cfq_merge(struct request_queue *q, struct request **req, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1543 1544 1545 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct request *__rq; |
1da177e4c Linux-2.6.12-rc2 |
1546 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1547 |
__rq = cfq_find_rq_fmerge(cfqd, bio); |
22e2c507c [PATCH] Update cf... |
1548 |
if (__rq && elv_rq_merge_ok(__rq, bio)) { |
9817064b6 [PATCH] elevator:... |
1549 1550 |
*req = __rq; return ELEVATOR_FRONT_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
1551 1552 1553 |
} return ELEVATOR_NO_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
1554 |
} |
165125e1e [BLOCK] Get rid o... |
1555 |
static void cfq_merged_request(struct request_queue *q, struct request *req, |
21183b07e [PATCH] cfq-iosch... |
1556 |
int type) |
1da177e4c Linux-2.6.12-rc2 |
1557 |
{ |
21183b07e [PATCH] cfq-iosch... |
1558 |
if (type == ELEVATOR_FRONT_MERGE) { |
5e7053747 [PATCH] cfq-iosch... |
1559 |
struct cfq_queue *cfqq = RQ_CFQQ(req); |
1da177e4c Linux-2.6.12-rc2 |
1560 |
|
5e7053747 [PATCH] cfq-iosch... |
1561 |
cfq_reposition_rq_rb(cfqq, req); |
1da177e4c Linux-2.6.12-rc2 |
1562 |
} |
1da177e4c Linux-2.6.12-rc2 |
1563 |
} |
812d40264 blkio: Add io_mer... |
1564 1565 1566 |
static void cfq_bio_merged(struct request_queue *q, struct request *req, struct bio *bio) { |
e98ef89b3 cfq-iosched: Fixe... |
1567 1568 |
cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg, bio_data_dir(bio), cfq_bio_sync(bio)); |
812d40264 blkio: Add io_mer... |
1569 |
} |
1da177e4c Linux-2.6.12-rc2 |
1570 |
static void |
165125e1e [BLOCK] Get rid o... |
1571 |
cfq_merged_requests(struct request_queue *q, struct request *rq, |
1da177e4c Linux-2.6.12-rc2 |
1572 1573 |
struct request *next) { |
cf7c25cf9 cfq-iosched: fix ... |
1574 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
4a0b75c7d block, cfq: fix e... |
1575 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
22e2c507c [PATCH] Update cf... |
1576 1577 1578 1579 |
/* * reposition in fifo if next is older than rq */ if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && |
30996f40b cfq-iosched: fix ... |
1580 |
time_before(rq_fifo_time(next), rq_fifo_time(rq))) { |
22e2c507c [PATCH] Update cf... |
1581 |
list_move(&rq->queuelist, &next->queuelist); |
30996f40b cfq-iosched: fix ... |
1582 1583 |
rq_set_fifo_time(rq, rq_fifo_time(next)); } |
22e2c507c [PATCH] Update cf... |
1584 |
|
cf7c25cf9 cfq-iosched: fix ... |
1585 1586 |
if (cfqq->next_rq == next) cfqq->next_rq = rq; |
b4878f245 [PATCH] 02/05: up... |
1587 |
cfq_remove_request(next); |
e98ef89b3 cfq-iosched: Fixe... |
1588 1589 |
cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(next), rq_is_sync(next)); |
4a0b75c7d block, cfq: fix e... |
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 |
cfqq = RQ_CFQQ(next); /* * all requests of this queue are merged to other queues, delete it * from the service tree. If it's the active_queue, * cfq_dispatch_requests() will choose to expire it or do idle */ if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list) && cfqq != cfqd->active_queue) cfq_del_cfqq_rr(cfqd, cfqq); |
22e2c507c [PATCH] Update cf... |
1600 |
} |
165125e1e [BLOCK] Get rid o... |
1601 |
static int cfq_allow_merge(struct request_queue *q, struct request *rq, |
da7752650 [PATCH] cfq-iosch... |
1602 1603 1604 |
struct bio *bio) { struct cfq_data *cfqd = q->elevator->elevator_data; |
c58698073 block, cfq: reorg... |
1605 |
struct cfq_io_cq *cic; |
da7752650 [PATCH] cfq-iosch... |
1606 |
struct cfq_queue *cfqq; |
da7752650 [PATCH] cfq-iosch... |
1607 1608 |
/* |
ec8acb690 [PATCH] cfq-iosch... |
1609 |
* Disallow merge of a sync bio into an async request. |
da7752650 [PATCH] cfq-iosch... |
1610 |
*/ |
91fac317a cfq-iosched: get ... |
1611 |
if (cfq_bio_sync(bio) && !rq_is_sync(rq)) |
a6151c3a5 cfq-iosched: appl... |
1612 |
return false; |
da7752650 [PATCH] cfq-iosch... |
1613 1614 |
/* |
f1a4f4d35 block, cfq: fix c... |
1615 1616 1617 1618 1619 1620 |
* Lookup the cfqq that this bio will be queued with and allow * merge only if rq is queued there. This function can be called * from plug merge without queue_lock. In such cases, ioc of @rq * and %current are guaranteed to be equal. Avoid lookup which * requires queue_lock by using @rq's cic. */ |
c58698073 block, cfq: reorg... |
1621 |
if (current->io_context == RQ_CIC(rq)->icq.ioc) { |
f1a4f4d35 block, cfq: fix c... |
1622 1623 1624 1625 1626 1627 |
cic = RQ_CIC(rq); } else { cic = cfq_cic_lookup(cfqd, current->io_context); if (!cic) return false; } |
719d34027 [PATCH] cfq-iosch... |
1628 |
|
91fac317a cfq-iosched: get ... |
1629 |
cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
a6151c3a5 cfq-iosched: appl... |
1630 |
return cfqq == RQ_CFQQ(rq); |
da7752650 [PATCH] cfq-iosch... |
1631 |
} |
812df48d1 blkio: Add more d... |
1632 1633 1634 |
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq) { del_timer(&cfqd->idle_slice_timer); |
e98ef89b3 cfq-iosched: Fixe... |
1635 |
cfq_blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg); |
812df48d1 blkio: Add more d... |
1636 |
} |
febffd618 cfq-iosched: kill... |
1637 1638 |
static void __cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
1639 1640 |
{ if (cfqq) { |
b1ffe737f cfq-iosched: Add ... |
1641 1642 |
cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d", cfqd->serving_prio, cfqd->serving_type); |
62a37f6ba cfq-iosched: Don'... |
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 |
cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg); cfqq->slice_start = 0; cfqq->dispatch_start = jiffies; cfqq->allocated_slice = 0; cfqq->slice_end = 0; cfqq->slice_dispatch = 0; cfqq->nr_sectors = 0; cfq_clear_cfqq_wait_request(cfqq); cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_must_alloc_slice(cfqq); cfq_clear_cfqq_fifo_expire(cfqq); cfq_mark_cfqq_slice_new(cfqq); cfq_del_timer(cfqd, cfqq); |
22e2c507c [PATCH] Update cf... |
1658 1659 1660 1661 1662 1663 |
} cfqd->active_queue = cfqq; } /* |
7b14e3b52 [PATCH] cfq-iosch... |
1664 1665 1666 1667 |
* current cfqq expired its slice (or was too idle), select new one */ static void __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
e5ff082e8 blkio: Fix anothe... |
1668 |
bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
1669 |
{ |
7b679138b cfq-iosched: add ... |
1670 |
cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
1671 |
if (cfq_cfqq_wait_request(cfqq)) |
812df48d1 blkio: Add more d... |
1672 |
cfq_del_timer(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
1673 |
|
7b14e3b52 [PATCH] cfq-iosch... |
1674 |
cfq_clear_cfqq_wait_request(cfqq); |
f75edf2dc blkio: Wait for c... |
1675 |
cfq_clear_cfqq_wait_busy(cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
1676 1677 |
/* |
ae54abed6 cfq-iosched: spli... |
1678 1679 1680 1681 1682 1683 1684 1685 1686 |
* If this cfqq is shared between multiple processes, check to * make sure that those processes are still issuing I/Os within * the mean seek distance. If not, it may be time to break the * queues apart again. */ if (cfq_cfqq_coop(cfqq) && CFQQ_SEEKY(cfqq)) cfq_mark_cfqq_split_coop(cfqq); /* |
6084cdda0 cfq-iosched: don'... |
1687 |
* store what was left of this slice, if the queue idled/timed out |
7b14e3b52 [PATCH] cfq-iosch... |
1688 |
*/ |
c553f8e33 block cfq: compen... |
1689 1690 |
if (timed_out) { if (cfq_cfqq_slice_new(cfqq)) |
ba5bd520f cfq: rename a fun... |
1691 |
cfqq->slice_resid = cfq_scaled_cfqq_slice(cfqd, cfqq); |
c553f8e33 block cfq: compen... |
1692 1693 |
else cfqq->slice_resid = cfqq->slice_end - jiffies; |
7b679138b cfq-iosched: add ... |
1694 1695 |
cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid); } |
7b14e3b52 [PATCH] cfq-iosch... |
1696 |
|
e5ff082e8 blkio: Fix anothe... |
1697 |
cfq_group_served(cfqd, cfqq->cfqg, cfqq); |
dae739ebc blkio: Group time... |
1698 |
|
f04a64246 blkio: Keep queue... |
1699 1700 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) cfq_del_cfqq_rr(cfqd, cfqq); |
edd75ffd9 cfq-iosched: get ... |
1701 |
cfq_resort_rr_list(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
1702 1703 1704 1705 1706 |
if (cfqq == cfqd->active_queue) cfqd->active_queue = NULL; if (cfqd->active_cic) { |
c58698073 block, cfq: reorg... |
1707 |
put_io_context(cfqd->active_cic->icq.ioc, cfqd->queue); |
7b14e3b52 [PATCH] cfq-iosch... |
1708 1709 |
cfqd->active_cic = NULL; } |
7b14e3b52 [PATCH] cfq-iosch... |
1710 |
} |
e5ff082e8 blkio: Fix anothe... |
1711 |
static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
1712 1713 1714 1715 |
{ struct cfq_queue *cfqq = cfqd->active_queue; if (cfqq) |
e5ff082e8 blkio: Fix anothe... |
1716 |
__cfq_slice_expired(cfqd, cfqq, timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
1717 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1718 1719 1720 1721 |
/* * Get next queue for service. Unless we have a queue preemption, * we'll simply select the first cfqq in the service tree. */ |
6d048f531 cfq-iosched: deve... |
1722 |
static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
1723 |
{ |
c0324a020 cfq-iosched: reim... |
1724 |
struct cfq_rb_root *service_tree = |
cdb16e8f7 blkio: Introduce ... |
1725 |
service_tree_for(cfqd->serving_group, cfqd->serving_prio, |
65b32a573 cfq-iosched: Remo... |
1726 |
cfqd->serving_type); |
d9e7620e6 cfq-iosched: rewo... |
1727 |
|
f04a64246 blkio: Keep queue... |
1728 1729 |
if (!cfqd->rq_queued) return NULL; |
1fa8f6d68 blkio: Introduce ... |
1730 1731 1732 |
/* There is nothing to dispatch */ if (!service_tree) return NULL; |
c0324a020 cfq-iosched: reim... |
1733 1734 1735 |
if (RB_EMPTY_ROOT(&service_tree->rb)) return NULL; return cfq_rb_first(service_tree); |
6d048f531 cfq-iosched: deve... |
1736 |
} |
f04a64246 blkio: Keep queue... |
1737 1738 |
static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd) { |
25fb5169d blkio: Dynamic cf... |
1739 |
struct cfq_group *cfqg; |
f04a64246 blkio: Keep queue... |
1740 1741 1742 1743 1744 1745 |
struct cfq_queue *cfqq; int i, j; struct cfq_rb_root *st; if (!cfqd->rq_queued) return NULL; |
25fb5169d blkio: Dynamic cf... |
1746 1747 1748 |
cfqg = cfq_get_next_cfqg(cfqd); if (!cfqg) return NULL; |
f04a64246 blkio: Keep queue... |
1749 1750 1751 1752 1753 |
for_each_cfqg_st(cfqg, i, j, st) if ((cfqq = cfq_rb_first(st)) != NULL) return cfqq; return NULL; } |
498d3aa2b [PATCH] cfq-iosch... |
1754 1755 1756 |
/* * Get and set a new active queue for service. */ |
a36e71f99 cfq-iosched: add ... |
1757 1758 |
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
1759 |
{ |
e00ef7997 cfq-iosched: get ... |
1760 |
if (!cfqq) |
a36e71f99 cfq-iosched: add ... |
1761 |
cfqq = cfq_get_next_queue(cfqd); |
6d048f531 cfq-iosched: deve... |
1762 |
|
22e2c507c [PATCH] Update cf... |
1763 |
__cfq_set_active_queue(cfqd, cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
1764 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
1765 |
} |
d9e7620e6 cfq-iosched: rewo... |
1766 1767 1768 |
static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd, struct request *rq) { |
83096ebf1 block: convert to... |
1769 1770 |
if (blk_rq_pos(rq) >= cfqd->last_position) return blk_rq_pos(rq) - cfqd->last_position; |
d9e7620e6 cfq-iosched: rewo... |
1771 |
else |
83096ebf1 block: convert to... |
1772 |
return cfqd->last_position - blk_rq_pos(rq); |
d9e7620e6 cfq-iosched: rewo... |
1773 |
} |
b2c18e1e0 cfq: calculate th... |
1774 |
static inline int cfq_rq_close(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
e9ce335df cfq-iosched: fix ... |
1775 |
struct request *rq) |
6d048f531 cfq-iosched: deve... |
1776 |
{ |
e9ce335df cfq-iosched: fix ... |
1777 |
return cfq_dist_from_last(cfqd, rq) <= CFQQ_CLOSE_THR; |
6d048f531 cfq-iosched: deve... |
1778 |
} |
a36e71f99 cfq-iosched: add ... |
1779 1780 1781 |
static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, struct cfq_queue *cur_cfqq) { |
f2d1f0ae7 cfq-iosched: cach... |
1782 |
struct rb_root *root = &cfqd->prio_trees[cur_cfqq->org_ioprio]; |
a36e71f99 cfq-iosched: add ... |
1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 |
struct rb_node *parent, *node; struct cfq_queue *__cfqq; sector_t sector = cfqd->last_position; if (RB_EMPTY_ROOT(root)) return NULL; /* * First, if we find a request starting at the end of the last * request, choose it. */ |
f2d1f0ae7 cfq-iosched: cach... |
1794 |
__cfqq = cfq_prio_tree_lookup(cfqd, root, sector, &parent, NULL); |
a36e71f99 cfq-iosched: add ... |
1795 1796 1797 1798 1799 1800 1801 1802 |
if (__cfqq) return __cfqq; /* * If the exact sector wasn't found, the parent of the NULL leaf * will contain the closest sector. */ __cfqq = rb_entry(parent, struct cfq_queue, p_node); |
e9ce335df cfq-iosched: fix ... |
1803 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1804 |
return __cfqq; |
2e46e8b27 block: drop reque... |
1805 |
if (blk_rq_pos(__cfqq->next_rq) < sector) |
a36e71f99 cfq-iosched: add ... |
1806 1807 1808 1809 1810 1811 1812 |
node = rb_next(&__cfqq->p_node); else node = rb_prev(&__cfqq->p_node); if (!node) return NULL; __cfqq = rb_entry(node, struct cfq_queue, p_node); |
e9ce335df cfq-iosched: fix ... |
1813 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 |
return __cfqq; return NULL; } /* * cfqd - obvious * cur_cfqq - passed in so that we don't decide that the current queue is * closely cooperating with itself. * * So, basically we're assuming that that cur_cfqq has dispatched at least * one request, and that cfqd->last_position reflects a position on the disk * associated with the I/O issued by cur_cfqq. I'm not sure this is a valid * assumption. */ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd, |
b3b6d0408 cfq: change the m... |
1830 |
struct cfq_queue *cur_cfqq) |
6d048f531 cfq-iosched: deve... |
1831 |
{ |
a36e71f99 cfq-iosched: add ... |
1832 |
struct cfq_queue *cfqq; |
39c01b219 cfq-iosched: Do n... |
1833 1834 |
if (cfq_class_idle(cur_cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
1835 1836 1837 1838 |
if (!cfq_cfqq_sync(cur_cfqq)) return NULL; if (CFQQ_SEEKY(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
1839 |
/* |
b9d8f4c73 cfq: Optimization... |
1840 1841 1842 1843 1844 1845 |
* Don't search priority tree if it's the only queue in the group. */ if (cur_cfqq->cfqg->nr_cfqq == 1) return NULL; /* |
d9e7620e6 cfq-iosched: rewo... |
1846 1847 1848 |
* We should notice if some of the queues are cooperating, eg * working closely on the same area of the disk. In that case, * we can group them together and don't waste time idling. |
6d048f531 cfq-iosched: deve... |
1849 |
*/ |
a36e71f99 cfq-iosched: add ... |
1850 1851 1852 |
cfqq = cfqq_close(cfqd, cur_cfqq); if (!cfqq) return NULL; |
8682e1f15 blkio: Provide so... |
1853 1854 1855 |
/* If new queue belongs to different cfq_group, don't choose it */ if (cur_cfqq->cfqg != cfqq->cfqg) return NULL; |
df5fe3e8e cfq: merge cooper... |
1856 1857 1858 1859 1860 |
/* * It only makes sense to merge sync queues. */ if (!cfq_cfqq_sync(cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
1861 1862 |
if (CFQQ_SEEKY(cfqq)) return NULL; |
df5fe3e8e cfq: merge cooper... |
1863 |
|
c0324a020 cfq-iosched: reim... |
1864 1865 1866 1867 1868 |
/* * Do not merge queues of different priority classes */ if (cfq_class_rt(cfqq) != cfq_class_rt(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
1869 |
return cfqq; |
6d048f531 cfq-iosched: deve... |
1870 |
} |
a6d44e982 cfq-iosched: enab... |
1871 1872 1873 1874 1875 1876 1877 |
/* * Determine whether we should enforce idle window for this queue. */ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq) { enum wl_prio_t prio = cfqq_prio(cfqq); |
718eee057 cfq-iosched: fair... |
1878 |
struct cfq_rb_root *service_tree = cfqq->service_tree; |
a6d44e982 cfq-iosched: enab... |
1879 |
|
f04a64246 blkio: Keep queue... |
1880 1881 |
BUG_ON(!service_tree); BUG_ON(!service_tree->count); |
b6508c161 cfq-iosched: Do n... |
1882 1883 |
if (!cfqd->cfq_slice_idle) return false; |
a6d44e982 cfq-iosched: enab... |
1884 1885 1886 1887 1888 |
/* We never do for idle class queues. */ if (prio == IDLE_WORKLOAD) return false; /* We do for queues that were marked with idle window flag. */ |
3c764b7a6 cfq-iosched: make... |
1889 1890 |
if (cfq_cfqq_idle_window(cfqq) && !(blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)) |
a6d44e982 cfq-iosched: enab... |
1891 1892 1893 1894 1895 1896 |
return true; /* * Otherwise, we do only if they are the last ones * in their service tree. */ |
f5f2b6ceb CFQ: add think ti... |
1897 1898 |
if (service_tree->count == 1 && cfq_cfqq_sync(cfqq) && !cfq_io_thinktime_big(cfqd, &service_tree->ttime, false)) |
c1e44756f cfq-iosched: do c... |
1899 |
return true; |
b1ffe737f cfq-iosched: Add ... |
1900 1901 |
cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d", service_tree->count); |
c1e44756f cfq-iosched: do c... |
1902 |
return false; |
a6d44e982 cfq-iosched: enab... |
1903 |
} |
6d048f531 cfq-iosched: deve... |
1904 |
static void cfq_arm_slice_timer(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
1905 |
{ |
1792669cc cfq-iosched: don'... |
1906 |
struct cfq_queue *cfqq = cfqd->active_queue; |
c58698073 block, cfq: reorg... |
1907 |
struct cfq_io_cq *cic; |
80bdf0c78 cfq-iosched: Impl... |
1908 |
unsigned long sl, group_idle = 0; |
7b14e3b52 [PATCH] cfq-iosch... |
1909 |
|
a68bbddba block: add queue ... |
1910 |
/* |
f7d7b7a7a block: as/cfq ssd... |
1911 1912 1913 |
* SSD device without seek penalty, disable idling. But only do so * for devices that support queuing, otherwise we still have a problem * with sync vs async workloads. |
a68bbddba block: add queue ... |
1914 |
*/ |
f7d7b7a7a block: as/cfq ssd... |
1915 |
if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag) |
a68bbddba block: add queue ... |
1916 |
return; |
dd67d0515 [PATCH] rbtree: s... |
1917 |
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); |
6d048f531 cfq-iosched: deve... |
1918 |
WARN_ON(cfq_cfqq_slice_new(cfqq)); |
22e2c507c [PATCH] Update cf... |
1919 1920 1921 1922 |
/* * idle is disabled, either manually or by past process history */ |
80bdf0c78 cfq-iosched: Impl... |
1923 1924 1925 1926 1927 1928 1929 |
if (!cfq_should_idle(cfqd, cfqq)) { /* no queue idling. Check for group idling */ if (cfqd->cfq_group_idle) group_idle = cfqd->cfq_group_idle; else return; } |
6d048f531 cfq-iosched: deve... |
1930 |
|
22e2c507c [PATCH] Update cf... |
1931 |
/* |
8e550632c cfq-iosched: fix ... |
1932 |
* still active requests from this queue, don't idle |
7b679138b cfq-iosched: add ... |
1933 |
*/ |
8e550632c cfq-iosched: fix ... |
1934 |
if (cfqq->dispatched) |
7b679138b cfq-iosched: add ... |
1935 1936 1937 |
return; /* |
22e2c507c [PATCH] Update cf... |
1938 1939 |
* task has exited, don't wait */ |
206dc69b3 [BLOCK] cfq-iosch... |
1940 |
cic = cfqd->active_cic; |
c58698073 block, cfq: reorg... |
1941 |
if (!cic || !atomic_read(&cic->icq.ioc->nr_tasks)) |
6d048f531 cfq-iosched: deve... |
1942 |
return; |
355b659c8 cfq-iosched: avoi... |
1943 1944 1945 1946 1947 |
/* * If our average think time is larger than the remaining time * slice, then don't idle. This avoids overrunning the allotted * time slice. */ |
383cd7213 CFQ: move think t... |
1948 1949 |
if (sample_valid(cic->ttime.ttime_samples) && (cfqq->slice_end - jiffies < cic->ttime.ttime_mean)) { |
fd16d2631 block: Add __attr... |
1950 |
cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%lu", |
383cd7213 CFQ: move think t... |
1951 |
cic->ttime.ttime_mean); |
355b659c8 cfq-iosched: avoi... |
1952 |
return; |
b1ffe737f cfq-iosched: Add ... |
1953 |
} |
355b659c8 cfq-iosched: avoi... |
1954 |
|
80bdf0c78 cfq-iosched: Impl... |
1955 1956 1957 |
/* There are other queues in the group, don't do group idle */ if (group_idle && cfqq->cfqg->nr_cfqq > 1) return; |
3b18152c3 [PATCH] CFQ io sc... |
1958 |
cfq_mark_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
1959 |
|
80bdf0c78 cfq-iosched: Impl... |
1960 1961 1962 1963 |
if (group_idle) sl = cfqd->cfq_group_idle; else sl = cfqd->cfq_slice_idle; |
206dc69b3 [BLOCK] cfq-iosch... |
1964 |
|
7b14e3b52 [PATCH] cfq-iosch... |
1965 |
mod_timer(&cfqd->idle_slice_timer, jiffies + sl); |
e98ef89b3 cfq-iosched: Fixe... |
1966 |
cfq_blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg); |
80bdf0c78 cfq-iosched: Impl... |
1967 1968 |
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu group_idle: %d", sl, group_idle ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1969 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1970 1971 1972 |
/* * Move request from internal lists to the request queue dispatch list. */ |
165125e1e [BLOCK] Get rid o... |
1973 |
static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1974 |
{ |
3ed9a2965 cfq-iosched: impr... |
1975 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
1976 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
1977 |
|
7b679138b cfq-iosched: add ... |
1978 |
cfq_log_cfqq(cfqd, cfqq, "dispatch_insert"); |
06d218864 cfq: choose a new... |
1979 |
cfqq->next_rq = cfq_find_next_rq(cfqd, cfqq, rq); |
5380a101d [PATCH] cfq-iosch... |
1980 |
cfq_remove_request(rq); |
6d048f531 cfq-iosched: deve... |
1981 |
cfqq->dispatched++; |
80bdf0c78 cfq-iosched: Impl... |
1982 |
(RQ_CFQG(rq))->dispatched++; |
5380a101d [PATCH] cfq-iosch... |
1983 |
elv_dispatch_sort(q, rq); |
3ed9a2965 cfq-iosched: impr... |
1984 |
|
53c583d22 cfq-iosched: requ... |
1985 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++; |
c4e7893eb cfq-iosched: blkt... |
1986 |
cfqq->nr_sectors += blk_rq_sectors(rq); |
e98ef89b3 cfq-iosched: Fixe... |
1987 |
cfq_blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq), |
84c124da9 blkio: Changes to... |
1988 |
rq_data_dir(rq), rq_is_sync(rq)); |
1da177e4c Linux-2.6.12-rc2 |
1989 1990 1991 1992 1993 |
} /* * return expired entry, or NULL to just start from scratch in rbtree */ |
febffd618 cfq-iosched: kill... |
1994 |
static struct request *cfq_check_fifo(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1995 |
{ |
30996f40b cfq-iosched: fix ... |
1996 |
struct request *rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1997 |
|
3b18152c3 [PATCH] CFQ io sc... |
1998 |
if (cfq_cfqq_fifo_expire(cfqq)) |
1da177e4c Linux-2.6.12-rc2 |
1999 |
return NULL; |
cb8874119 cfq-iosched: twea... |
2000 2001 |
cfq_mark_cfqq_fifo_expire(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
2002 2003 |
if (list_empty(&cfqq->fifo)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2004 |
|
89850f7ee [PATCH] cfq-iosch... |
2005 |
rq = rq_entry_fifo(cfqq->fifo.next); |
30996f40b cfq-iosched: fix ... |
2006 |
if (time_before(jiffies, rq_fifo_time(rq))) |
7b679138b cfq-iosched: add ... |
2007 |
rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2008 |
|
30996f40b cfq-iosched: fix ... |
2009 |
cfq_log_cfqq(cfqq->cfqd, cfqq, "fifo=%p", rq); |
6d048f531 cfq-iosched: deve... |
2010 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
2011 |
} |
22e2c507c [PATCH] Update cf... |
2012 2013 2014 2015 |
static inline int cfq_prio_to_maxrq(struct cfq_data *cfqd, struct cfq_queue *cfqq) { const int base_rq = cfqd->cfq_slice_async_rq; |
1da177e4c Linux-2.6.12-rc2 |
2016 |
|
22e2c507c [PATCH] Update cf... |
2017 |
WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
1da177e4c Linux-2.6.12-rc2 |
2018 |
|
b9f8ce059 cfq-iosched: alge... |
2019 |
return 2 * base_rq * (IOPRIO_BE_NR - cfqq->ioprio); |
1da177e4c Linux-2.6.12-rc2 |
2020 |
} |
22e2c507c [PATCH] Update cf... |
2021 |
/* |
df5fe3e8e cfq: merge cooper... |
2022 2023 2024 2025 2026 2027 2028 |
* Must be called with the queue_lock held. */ static int cfqq_process_refs(struct cfq_queue *cfqq) { int process_refs, io_refs; io_refs = cfqq->allocated[READ] + cfqq->allocated[WRITE]; |
30d7b9448 block cfq: don't ... |
2029 |
process_refs = cfqq->ref - io_refs; |
df5fe3e8e cfq: merge cooper... |
2030 2031 2032 2033 2034 2035 |
BUG_ON(process_refs < 0); return process_refs; } static void cfq_setup_merge(struct cfq_queue *cfqq, struct cfq_queue *new_cfqq) { |
e6c5bc737 cfq: break apart ... |
2036 |
int process_refs, new_process_refs; |
df5fe3e8e cfq: merge cooper... |
2037 |
struct cfq_queue *__cfqq; |
c10b61f09 cfq: Don't allow ... |
2038 2039 2040 2041 2042 2043 2044 2045 |
/* * If there are no process references on the new_cfqq, then it is * unsafe to follow the ->new_cfqq chain as other cfqq's in the * chain may have dropped their last reference (not just their * last process reference). */ if (!cfqq_process_refs(new_cfqq)) return; |
df5fe3e8e cfq: merge cooper... |
2046 2047 2048 2049 2050 2051 2052 2053 |
/* Avoid a circular list and skip interim queue merges */ while ((__cfqq = new_cfqq->new_cfqq)) { if (__cfqq == cfqq) return; new_cfqq = __cfqq; } process_refs = cfqq_process_refs(cfqq); |
c10b61f09 cfq: Don't allow ... |
2054 |
new_process_refs = cfqq_process_refs(new_cfqq); |
df5fe3e8e cfq: merge cooper... |
2055 2056 2057 2058 |
/* * If the process for the cfqq has gone away, there is no * sense in merging the queues. */ |
c10b61f09 cfq: Don't allow ... |
2059 |
if (process_refs == 0 || new_process_refs == 0) |
df5fe3e8e cfq: merge cooper... |
2060 |
return; |
e6c5bc737 cfq: break apart ... |
2061 2062 2063 |
/* * Merge in the direction of the lesser amount of work. */ |
e6c5bc737 cfq: break apart ... |
2064 2065 |
if (new_process_refs >= process_refs) { cfqq->new_cfqq = new_cfqq; |
30d7b9448 block cfq: don't ... |
2066 |
new_cfqq->ref += process_refs; |
e6c5bc737 cfq: break apart ... |
2067 2068 |
} else { new_cfqq->new_cfqq = cfqq; |
30d7b9448 block cfq: don't ... |
2069 |
cfqq->ref += new_process_refs; |
e6c5bc737 cfq: break apart ... |
2070 |
} |
df5fe3e8e cfq: merge cooper... |
2071 |
} |
cdb16e8f7 blkio: Introduce ... |
2072 |
static enum wl_type_t cfq_choose_wl(struct cfq_data *cfqd, |
65b32a573 cfq-iosched: Remo... |
2073 |
struct cfq_group *cfqg, enum wl_prio_t prio) |
718eee057 cfq-iosched: fair... |
2074 2075 2076 2077 2078 2079 |
{ struct cfq_queue *queue; int i; bool key_valid = false; unsigned long lowest_key = 0; enum wl_type_t cur_best = SYNC_NOIDLE_WORKLOAD; |
65b32a573 cfq-iosched: Remo... |
2080 2081 2082 |
for (i = 0; i <= SYNC_WORKLOAD; ++i) { /* select the one with lowest rb_key */ queue = cfq_rb_first(service_tree_for(cfqg, prio, i)); |
718eee057 cfq-iosched: fair... |
2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 |
if (queue && (!key_valid || time_before(queue->rb_key, lowest_key))) { lowest_key = queue->rb_key; cur_best = i; key_valid = true; } } return cur_best; } |
cdb16e8f7 blkio: Introduce ... |
2093 |
static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg) |
718eee057 cfq-iosched: fair... |
2094 |
{ |
718eee057 cfq-iosched: fair... |
2095 2096 |
unsigned slice; unsigned count; |
cdb16e8f7 blkio: Introduce ... |
2097 |
struct cfq_rb_root *st; |
58ff82f34 blkio: Implement ... |
2098 |
unsigned group_slice; |
e4ea0c16a block cfq: select... |
2099 |
enum wl_prio_t original_prio = cfqd->serving_prio; |
1fa8f6d68 blkio: Introduce ... |
2100 |
|
718eee057 cfq-iosched: fair... |
2101 |
/* Choose next priority. RT > BE > IDLE */ |
58ff82f34 blkio: Implement ... |
2102 |
if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg)) |
718eee057 cfq-iosched: fair... |
2103 |
cfqd->serving_prio = RT_WORKLOAD; |
58ff82f34 blkio: Implement ... |
2104 |
else if (cfq_group_busy_queues_wl(BE_WORKLOAD, cfqd, cfqg)) |
718eee057 cfq-iosched: fair... |
2105 2106 2107 2108 2109 2110 |
cfqd->serving_prio = BE_WORKLOAD; else { cfqd->serving_prio = IDLE_WORKLOAD; cfqd->workload_expires = jiffies + 1; return; } |
e4ea0c16a block cfq: select... |
2111 2112 |
if (original_prio != cfqd->serving_prio) goto new_workload; |
718eee057 cfq-iosched: fair... |
2113 2114 2115 2116 2117 |
/* * For RT and BE, we have to choose also the type * (SYNC, SYNC_NOIDLE, ASYNC), and to compute a workload * expiration time */ |
65b32a573 cfq-iosched: Remo... |
2118 |
st = service_tree_for(cfqg, cfqd->serving_prio, cfqd->serving_type); |
cdb16e8f7 blkio: Introduce ... |
2119 |
count = st->count; |
718eee057 cfq-iosched: fair... |
2120 2121 |
/* |
65b32a573 cfq-iosched: Remo... |
2122 |
* check workload expiration, and that we still have other queues ready |
718eee057 cfq-iosched: fair... |
2123 |
*/ |
65b32a573 cfq-iosched: Remo... |
2124 |
if (count && !time_after(jiffies, cfqd->workload_expires)) |
718eee057 cfq-iosched: fair... |
2125 |
return; |
e4ea0c16a block cfq: select... |
2126 |
new_workload: |
718eee057 cfq-iosched: fair... |
2127 2128 |
/* otherwise select new workload type */ cfqd->serving_type = |
65b32a573 cfq-iosched: Remo... |
2129 2130 |
cfq_choose_wl(cfqd, cfqg, cfqd->serving_prio); st = service_tree_for(cfqg, cfqd->serving_prio, cfqd->serving_type); |
cdb16e8f7 blkio: Introduce ... |
2131 |
count = st->count; |
718eee057 cfq-iosched: fair... |
2132 2133 2134 2135 2136 2137 |
/* * the workload slice is computed as a fraction of target latency * proportional to the number of queues in that workload, over * all the queues in the same priority class */ |
58ff82f34 blkio: Implement ... |
2138 2139 2140 2141 2142 |
group_slice = cfq_group_slice(cfqd, cfqg); slice = group_slice * count / max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_prio], cfq_group_busy_queues_wl(cfqd->serving_prio, cfqd, cfqg)); |
718eee057 cfq-iosched: fair... |
2143 |
|
f26bd1f0a blkio: Determine ... |
2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 |
if (cfqd->serving_type == ASYNC_WORKLOAD) { unsigned int tmp; /* * Async queues are currently system wide. Just taking * proportion of queues with-in same group will lead to higher * async ratio system wide as generally root group is going * to have higher weight. A more accurate thing would be to * calculate system wide asnc/sync ratio. */ tmp = cfq_target_latency * cfqg_busy_async_queues(cfqd, cfqg); tmp = tmp/cfqd->busy_queues; slice = min_t(unsigned, slice, tmp); |
718eee057 cfq-iosched: fair... |
2157 2158 2159 |
/* async workload slice is scaled down according to * the sync/async slice ratio. */ slice = slice * cfqd->cfq_slice[0] / cfqd->cfq_slice[1]; |
f26bd1f0a blkio: Determine ... |
2160 |
} else |
718eee057 cfq-iosched: fair... |
2161 2162 2163 2164 |
/* sync workload slice is at least 2 * cfq_slice_idle */ slice = max(slice, 2 * cfqd->cfq_slice_idle); slice = max_t(unsigned, slice, CFQ_MIN_TT); |
b1ffe737f cfq-iosched: Add ... |
2165 |
cfq_log(cfqd, "workload slice:%d", slice); |
718eee057 cfq-iosched: fair... |
2166 2167 |
cfqd->workload_expires = jiffies + slice; } |
1fa8f6d68 blkio: Introduce ... |
2168 2169 2170 |
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd) { struct cfq_rb_root *st = &cfqd->grp_service_tree; |
25bc6b077 blkio: Introduce ... |
2171 |
struct cfq_group *cfqg; |
1fa8f6d68 blkio: Introduce ... |
2172 2173 2174 |
if (RB_EMPTY_ROOT(&st->rb)) return NULL; |
25bc6b077 blkio: Introduce ... |
2175 |
cfqg = cfq_rb_first_group(st); |
25bc6b077 blkio: Introduce ... |
2176 2177 |
update_min_vdisktime(st); return cfqg; |
1fa8f6d68 blkio: Introduce ... |
2178 |
} |
cdb16e8f7 blkio: Introduce ... |
2179 2180 |
static void cfq_choose_cfqg(struct cfq_data *cfqd) { |
1fa8f6d68 blkio: Introduce ... |
2181 2182 2183 |
struct cfq_group *cfqg = cfq_get_next_cfqg(cfqd); cfqd->serving_group = cfqg; |
dae739ebc blkio: Group time... |
2184 2185 2186 2187 2188 2189 |
/* Restore the workload type data */ if (cfqg->saved_workload_slice) { cfqd->workload_expires = jiffies + cfqg->saved_workload_slice; cfqd->serving_type = cfqg->saved_workload; cfqd->serving_prio = cfqg->saved_serving_prio; |
66ae29197 cfq: set workload... |
2190 2191 |
} else cfqd->workload_expires = jiffies - 1; |
1fa8f6d68 blkio: Introduce ... |
2192 |
choose_service_tree(cfqd, cfqg); |
cdb16e8f7 blkio: Introduce ... |
2193 |
} |
df5fe3e8e cfq: merge cooper... |
2194 |
/* |
498d3aa2b [PATCH] cfq-iosch... |
2195 2196 |
* Select a queue for service. If we have a current active queue, * check whether to continue servicing it, or retrieve and set a new one. |
22e2c507c [PATCH] Update cf... |
2197 |
*/ |
1b5ed5e1f [BLOCK] cfq-iosch... |
2198 |
static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
1da177e4c Linux-2.6.12-rc2 |
2199 |
{ |
a36e71f99 cfq-iosched: add ... |
2200 |
struct cfq_queue *cfqq, *new_cfqq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2201 |
|
22e2c507c [PATCH] Update cf... |
2202 2203 2204 |
cfqq = cfqd->active_queue; if (!cfqq) goto new_queue; |
1da177e4c Linux-2.6.12-rc2 |
2205 |
|
f04a64246 blkio: Keep queue... |
2206 2207 |
if (!cfqd->rq_queued) return NULL; |
c244bb50a cfq-iosched: Get ... |
2208 2209 2210 2211 2212 2213 |
/* * We were waiting for group to get backlogged. Expire the queue */ if (cfq_cfqq_wait_busy(cfqq) && !RB_EMPTY_ROOT(&cfqq->sort_list)) goto expire; |
22e2c507c [PATCH] Update cf... |
2214 |
/* |
6d048f531 cfq-iosched: deve... |
2215 |
* The active queue has run out of time, expire it and select new. |
22e2c507c [PATCH] Update cf... |
2216 |
*/ |
7667aa063 cfq-iosched: Take... |
2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 |
if (cfq_slice_used(cfqq) && !cfq_cfqq_must_dispatch(cfqq)) { /* * If slice had not expired at the completion of last request * we might not have turned on wait_busy flag. Don't expire * the queue yet. Allow the group to get backlogged. * * The very fact that we have used the slice, that means we * have been idling all along on this queue and it should be * ok to wait for this request to complete. */ |
82bbbf28d Fix a CFQ crash i... |
2227 2228 2229 |
if (cfqq->cfqg->nr_cfqq == 1 && RB_EMPTY_ROOT(&cfqq->sort_list) && cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) { cfqq = NULL; |
7667aa063 cfq-iosched: Take... |
2230 |
goto keep_queue; |
82bbbf28d Fix a CFQ crash i... |
2231 |
} else |
80bdf0c78 cfq-iosched: Impl... |
2232 |
goto check_group_idle; |
7667aa063 cfq-iosched: Take... |
2233 |
} |
1da177e4c Linux-2.6.12-rc2 |
2234 |
|
22e2c507c [PATCH] Update cf... |
2235 |
/* |
6d048f531 cfq-iosched: deve... |
2236 2237 |
* The active queue has requests and isn't expired, allow it to * dispatch. |
22e2c507c [PATCH] Update cf... |
2238 |
*/ |
dd67d0515 [PATCH] rbtree: s... |
2239 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
2240 |
goto keep_queue; |
6d048f531 cfq-iosched: deve... |
2241 2242 |
/* |
a36e71f99 cfq-iosched: add ... |
2243 2244 2245 |
* If another queue has a request waiting within our mean seek * distance, let it run. The expire code will check for close * cooperators and put the close queue at the front of the service |
df5fe3e8e cfq: merge cooper... |
2246 |
* tree. If possible, merge the expiring queue with the new cfqq. |
a36e71f99 cfq-iosched: add ... |
2247 |
*/ |
b3b6d0408 cfq: change the m... |
2248 |
new_cfqq = cfq_close_cooperator(cfqd, cfqq); |
df5fe3e8e cfq: merge cooper... |
2249 2250 2251 |
if (new_cfqq) { if (!cfqq->new_cfqq) cfq_setup_merge(cfqq, new_cfqq); |
a36e71f99 cfq-iosched: add ... |
2252 |
goto expire; |
df5fe3e8e cfq: merge cooper... |
2253 |
} |
a36e71f99 cfq-iosched: add ... |
2254 2255 |
/* |
6d048f531 cfq-iosched: deve... |
2256 2257 2258 2259 |
* No requests pending. If the active queue still has requests in * flight or is idling for a new request, allow either of these * conditions to happen (or time out) before selecting a new queue. */ |
80bdf0c78 cfq-iosched: Impl... |
2260 2261 2262 2263 |
if (timer_pending(&cfqd->idle_slice_timer)) { cfqq = NULL; goto keep_queue; } |
8e1ac6655 cfq-iosched: don'... |
2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 |
/* * This is a deep seek queue, but the device is much faster than * the queue can deliver, don't idle **/ if (CFQQ_SEEKY(cfqq) && cfq_cfqq_idle_window(cfqq) && (cfq_cfqq_slice_new(cfqq) || (cfqq->slice_end - jiffies > jiffies - cfqq->slice_start))) { cfq_clear_cfqq_deep(cfqq); cfq_clear_cfqq_idle_window(cfqq); } |
80bdf0c78 cfq-iosched: Impl... |
2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 |
if (cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) { cfqq = NULL; goto keep_queue; } /* * If group idle is enabled and there are requests dispatched from * this group, wait for requests to complete. */ check_group_idle: |
7700fc4f6 CFQ: add think ti... |
2284 2285 2286 |
if (cfqd->cfq_group_idle && cfqq->cfqg->nr_cfqq == 1 && cfqq->cfqg->dispatched && !cfq_io_thinktime_big(cfqd, &cfqq->cfqg->ttime, true)) { |
caaa5f9f0 [PATCH] cfq-iosch... |
2287 2288 |
cfqq = NULL; goto keep_queue; |
22e2c507c [PATCH] Update cf... |
2289 |
} |
3b18152c3 [PATCH] CFQ io sc... |
2290 |
expire: |
e5ff082e8 blkio: Fix anothe... |
2291 |
cfq_slice_expired(cfqd, 0); |
3b18152c3 [PATCH] CFQ io sc... |
2292 |
new_queue: |
718eee057 cfq-iosched: fair... |
2293 2294 2295 2296 2297 |
/* * Current queue expired. Check if we have to switch to a new * service tree */ if (!new_cfqq) |
cdb16e8f7 blkio: Introduce ... |
2298 |
cfq_choose_cfqg(cfqd); |
718eee057 cfq-iosched: fair... |
2299 |
|
a36e71f99 cfq-iosched: add ... |
2300 |
cfqq = cfq_set_active_queue(cfqd, new_cfqq); |
22e2c507c [PATCH] Update cf... |
2301 |
keep_queue: |
3b18152c3 [PATCH] CFQ io sc... |
2302 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
2303 |
} |
febffd618 cfq-iosched: kill... |
2304 |
static int __cfq_forced_dispatch_cfqq(struct cfq_queue *cfqq) |
d9e7620e6 cfq-iosched: rewo... |
2305 2306 2307 2308 2309 2310 2311 2312 2313 |
{ int dispatched = 0; while (cfqq->next_rq) { cfq_dispatch_insert(cfqq->cfqd->queue, cfqq->next_rq); dispatched++; } BUG_ON(!list_empty(&cfqq->fifo)); |
f04a64246 blkio: Keep queue... |
2314 2315 |
/* By default cfqq is not expired if it is empty. Do it explicitly */ |
e5ff082e8 blkio: Fix anothe... |
2316 |
__cfq_slice_expired(cfqq->cfqd, cfqq, 0); |
d9e7620e6 cfq-iosched: rewo... |
2317 2318 |
return dispatched; } |
498d3aa2b [PATCH] cfq-iosch... |
2319 2320 2321 2322 |
/* * Drain our current requests. Used for barriers and when switching * io schedulers on-the-fly. */ |
d9e7620e6 cfq-iosched: rewo... |
2323 |
static int cfq_forced_dispatch(struct cfq_data *cfqd) |
1b5ed5e1f [BLOCK] cfq-iosch... |
2324 |
{ |
0871714e0 cfq-iosched: rela... |
2325 |
struct cfq_queue *cfqq; |
d9e7620e6 cfq-iosched: rewo... |
2326 |
int dispatched = 0; |
cdb16e8f7 blkio: Introduce ... |
2327 |
|
3440c49f5 cfq-iosched: Fix ... |
2328 |
/* Expire the timeslice of the current active queue first */ |
e5ff082e8 blkio: Fix anothe... |
2329 |
cfq_slice_expired(cfqd, 0); |
3440c49f5 cfq-iosched: Fix ... |
2330 2331 |
while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL) { __cfq_set_active_queue(cfqd, cfqq); |
f04a64246 blkio: Keep queue... |
2332 |
dispatched += __cfq_forced_dispatch_cfqq(cfqq); |
3440c49f5 cfq-iosched: Fix ... |
2333 |
} |
1b5ed5e1f [BLOCK] cfq-iosch... |
2334 |
|
1b5ed5e1f [BLOCK] cfq-iosch... |
2335 |
BUG_ON(cfqd->busy_queues); |
6923715ae cfq: remove extra... |
2336 |
cfq_log(cfqd, "forced_dispatch=%d", dispatched); |
1b5ed5e1f [BLOCK] cfq-iosch... |
2337 2338 |
return dispatched; } |
abc3c744d cfq-iosched: quan... |
2339 2340 2341 2342 2343 |
static inline bool cfq_slice_used_soon(struct cfq_data *cfqd, struct cfq_queue *cfqq) { /* the queue hasn't finished any request, can't estimate */ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
2344 |
return true; |
abc3c744d cfq-iosched: quan... |
2345 2346 |
if (time_after(jiffies + cfqd->cfq_slice_idle * cfqq->dispatched, cfqq->slice_end)) |
c1e44756f cfq-iosched: do c... |
2347 |
return true; |
abc3c744d cfq-iosched: quan... |
2348 |
|
c1e44756f cfq-iosched: do c... |
2349 |
return false; |
abc3c744d cfq-iosched: quan... |
2350 |
} |
0b182d617 cfq-iosched: abst... |
2351 |
static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
2f5cb7381 cfq-iosched: chan... |
2352 |
{ |
2f5cb7381 cfq-iosched: chan... |
2353 |
unsigned int max_dispatch; |
22e2c507c [PATCH] Update cf... |
2354 |
|
2f5cb7381 cfq-iosched: chan... |
2355 |
/* |
5ad531db6 cfq-iosched: drai... |
2356 2357 |
* Drain async requests before we start sync IO */ |
53c583d22 cfq-iosched: requ... |
2358 |
if (cfq_should_idle(cfqd, cfqq) && cfqd->rq_in_flight[BLK_RW_ASYNC]) |
0b182d617 cfq-iosched: abst... |
2359 |
return false; |
5ad531db6 cfq-iosched: drai... |
2360 2361 |
/* |
2f5cb7381 cfq-iosched: chan... |
2362 2363 |
* If this is an async queue and we have sync IO in flight, let it wait */ |
53c583d22 cfq-iosched: requ... |
2364 |
if (cfqd->rq_in_flight[BLK_RW_SYNC] && !cfq_cfqq_sync(cfqq)) |
0b182d617 cfq-iosched: abst... |
2365 |
return false; |
2f5cb7381 cfq-iosched: chan... |
2366 |
|
abc3c744d cfq-iosched: quan... |
2367 |
max_dispatch = max_t(unsigned int, cfqd->cfq_quantum / 2, 1); |
2f5cb7381 cfq-iosched: chan... |
2368 2369 |
if (cfq_class_idle(cfqq)) max_dispatch = 1; |
b4878f245 [PATCH] 02/05: up... |
2370 |
|
2f5cb7381 cfq-iosched: chan... |
2371 2372 2373 2374 |
/* * Does this cfqq already have too much IO in flight? */ if (cfqq->dispatched >= max_dispatch) { |
ef8a41df8 cfq-iosched: give... |
2375 |
bool promote_sync = false; |
2f5cb7381 cfq-iosched: chan... |
2376 2377 2378 |
/* * idle queue must always only have a single IO in flight */ |
3ed9a2965 cfq-iosched: impr... |
2379 |
if (cfq_class_idle(cfqq)) |
0b182d617 cfq-iosched: abst... |
2380 |
return false; |
3ed9a2965 cfq-iosched: impr... |
2381 |
|
2f5cb7381 cfq-iosched: chan... |
2382 |
/* |
c4ade94fc cfq-iosched: remo... |
2383 2384 |
* If there is only one sync queue * we can ignore async queue here and give the sync |
ef8a41df8 cfq-iosched: give... |
2385 2386 2387 2388 |
* queue no dispatch limit. The reason is a sync queue can * preempt async queue, limiting the sync queue doesn't make * sense. This is useful for aiostress test. */ |
c4ade94fc cfq-iosched: remo... |
2389 2390 |
if (cfq_cfqq_sync(cfqq) && cfqd->busy_sync_queues == 1) promote_sync = true; |
ef8a41df8 cfq-iosched: give... |
2391 2392 |
/* |
2f5cb7381 cfq-iosched: chan... |
2393 2394 |
* We have other queues, don't allow more IO from this one */ |
ef8a41df8 cfq-iosched: give... |
2395 2396 |
if (cfqd->busy_queues > 1 && cfq_slice_used_soon(cfqd, cfqq) && !promote_sync) |
0b182d617 cfq-iosched: abst... |
2397 |
return false; |
9ede209e8 cfq-iosched: impr... |
2398 |
|
2f5cb7381 cfq-iosched: chan... |
2399 |
/* |
474b18ccc cfq-iosched: no d... |
2400 |
* Sole queue user, no limit |
365722bb9 cfq-iosched: dela... |
2401 |
*/ |
ef8a41df8 cfq-iosched: give... |
2402 |
if (cfqd->busy_queues == 1 || promote_sync) |
abc3c744d cfq-iosched: quan... |
2403 2404 2405 2406 2407 2408 2409 2410 2411 |
max_dispatch = -1; else /* * Normally we start throttling cfqq when cfq_quantum/2 * requests have been dispatched. But we can drive * deeper queue depths at the beginning of slice * subjected to upper limit of cfq_quantum. * */ max_dispatch = cfqd->cfq_quantum; |
8e2967555 cfq-iosched: impl... |
2412 2413 2414 2415 2416 2417 2418 |
} /* * Async queues must wait a bit before being allowed dispatch. * We also ramp up the dispatch depth gradually for async IO, * based on the last sync IO we serviced */ |
963b72fc6 cfq-iosched: rena... |
2419 |
if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) { |
573412b29 cfq-iosched: redu... |
2420 |
unsigned long last_sync = jiffies - cfqd->last_delayed_sync; |
8e2967555 cfq-iosched: impl... |
2421 |
unsigned int depth; |
365722bb9 cfq-iosched: dela... |
2422 |
|
61f0c1dca cfq-iosched: use ... |
2423 |
depth = last_sync / cfqd->cfq_slice[1]; |
e00c54c36 cfq-iosched: don'... |
2424 2425 |
if (!depth && !cfqq->dispatched) depth = 1; |
8e2967555 cfq-iosched: impl... |
2426 2427 |
if (depth < max_dispatch) max_dispatch = depth; |
2f5cb7381 cfq-iosched: chan... |
2428 |
} |
3ed9a2965 cfq-iosched: impr... |
2429 |
|
0b182d617 cfq-iosched: abst... |
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 2456 2457 2458 2459 2460 2461 |
/* * If we're below the current max, allow a dispatch */ return cfqq->dispatched < max_dispatch; } /* * Dispatch a request from cfqq, moving them to the request queue * dispatch list. */ static bool cfq_dispatch_request(struct cfq_data *cfqd, struct cfq_queue *cfqq) { struct request *rq; BUG_ON(RB_EMPTY_ROOT(&cfqq->sort_list)); if (!cfq_may_dispatch(cfqd, cfqq)) return false; /* * follow expired path, else get first next available */ rq = cfq_check_fifo(cfqq); if (!rq) rq = cfqq->next_rq; /* * insert request into driver dispatch list */ cfq_dispatch_insert(cfqd->queue, rq); if (!cfqd->active_cic) { |
c58698073 block, cfq: reorg... |
2462 |
struct cfq_io_cq *cic = RQ_CIC(rq); |
0b182d617 cfq-iosched: abst... |
2463 |
|
c58698073 block, cfq: reorg... |
2464 |
atomic_long_inc(&cic->icq.ioc->refcount); |
0b182d617 cfq-iosched: abst... |
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 |
cfqd->active_cic = cic; } return true; } /* * Find the cfqq that we need to service and move a request from that to the * dispatch list */ static int cfq_dispatch_requests(struct request_queue *q, int force) { struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_queue *cfqq; if (!cfqd->busy_queues) return 0; if (unlikely(force)) return cfq_forced_dispatch(cfqd); cfqq = cfq_select_queue(cfqd); if (!cfqq) |
8e2967555 cfq-iosched: impl... |
2488 |
return 0; |
2f5cb7381 cfq-iosched: chan... |
2489 |
/* |
0b182d617 cfq-iosched: abst... |
2490 |
* Dispatch a request from this cfqq, if it is allowed |
2f5cb7381 cfq-iosched: chan... |
2491 |
*/ |
0b182d617 cfq-iosched: abst... |
2492 2493 |
if (!cfq_dispatch_request(cfqd, cfqq)) return 0; |
2f5cb7381 cfq-iosched: chan... |
2494 |
cfqq->slice_dispatch++; |
b029195dd cfq-iosched: don'... |
2495 |
cfq_clear_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
2496 |
|
2f5cb7381 cfq-iosched: chan... |
2497 2498 2499 2500 2501 2502 2503 2504 |
/* * expire an async queue immediately if it has used up its slice. idle * queue always expire after 1 dispatch round. */ if (cfqd->busy_queues > 1 && ((!cfq_cfqq_sync(cfqq) && cfqq->slice_dispatch >= cfq_prio_to_maxrq(cfqd, cfqq)) || cfq_class_idle(cfqq))) { cfqq->slice_end = jiffies + 1; |
e5ff082e8 blkio: Fix anothe... |
2505 |
cfq_slice_expired(cfqd, 0); |
1da177e4c Linux-2.6.12-rc2 |
2506 |
} |
b217a903a cfq: fix the log ... |
2507 |
cfq_log_cfqq(cfqd, cfqq, "dispatched a request"); |
2f5cb7381 cfq-iosched: chan... |
2508 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
2509 |
} |
1da177e4c Linux-2.6.12-rc2 |
2510 |
/* |
5e7053747 [PATCH] cfq-iosch... |
2511 2512 |
* task holds one reference to the queue, dropped when task exits. each rq * in-flight on this queue also holds a reference, dropped when rq is freed. |
1da177e4c Linux-2.6.12-rc2 |
2513 |
* |
b1c357696 blkio: Take care ... |
2514 |
* Each cfq queue took a reference on the parent group. Drop it now. |
1da177e4c Linux-2.6.12-rc2 |
2515 2516 2517 2518 |
* queue lock must be held here. */ static void cfq_put_queue(struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
2519 |
struct cfq_data *cfqd = cfqq->cfqd; |
0bbfeb832 cfq-iosched: Alwa... |
2520 |
struct cfq_group *cfqg; |
22e2c507c [PATCH] Update cf... |
2521 |
|
30d7b9448 block cfq: don't ... |
2522 |
BUG_ON(cfqq->ref <= 0); |
1da177e4c Linux-2.6.12-rc2 |
2523 |
|
30d7b9448 block cfq: don't ... |
2524 2525 |
cfqq->ref--; if (cfqq->ref) |
1da177e4c Linux-2.6.12-rc2 |
2526 |
return; |
7b679138b cfq-iosched: add ... |
2527 |
cfq_log_cfqq(cfqd, cfqq, "put_queue"); |
1da177e4c Linux-2.6.12-rc2 |
2528 |
BUG_ON(rb_first(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
2529 |
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
b1c357696 blkio: Take care ... |
2530 |
cfqg = cfqq->cfqg; |
1da177e4c Linux-2.6.12-rc2 |
2531 |
|
28f95cbc3 cfq-iosched: remo... |
2532 |
if (unlikely(cfqd->active_queue == cfqq)) { |
e5ff082e8 blkio: Fix anothe... |
2533 |
__cfq_slice_expired(cfqd, cfqq, 0); |
23e018a1b block: get rid of... |
2534 |
cfq_schedule_dispatch(cfqd); |
28f95cbc3 cfq-iosched: remo... |
2535 |
} |
22e2c507c [PATCH] Update cf... |
2536 |
|
f04a64246 blkio: Keep queue... |
2537 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); |
1da177e4c Linux-2.6.12-rc2 |
2538 |
kmem_cache_free(cfq_pool, cfqq); |
b1c357696 blkio: Take care ... |
2539 |
cfq_put_cfqg(cfqg); |
1da177e4c Linux-2.6.12-rc2 |
2540 |
} |
d02a2c077 cfq-iosched: fix ... |
2541 |
static void cfq_put_cooperator(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2542 |
{ |
df5fe3e8e cfq: merge cooper... |
2543 |
struct cfq_queue *__cfqq, *next; |
df5fe3e8e cfq: merge cooper... |
2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 |
/* * If this queue was scheduled to merge with another queue, be * sure to drop the reference taken on that queue (and others in * the merge chain). See cfq_setup_merge and cfq_merge_cfqqs. */ __cfqq = cfqq->new_cfqq; while (__cfqq) { if (__cfqq == cfqq) { WARN(1, "cfqq->new_cfqq loop detected "); break; } next = __cfqq->new_cfqq; cfq_put_queue(__cfqq); __cfqq = next; } |
d02a2c077 cfq-iosched: fix ... |
2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 |
} static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) { if (unlikely(cfqq == cfqd->active_queue)) { __cfq_slice_expired(cfqd, cfqq, 0); cfq_schedule_dispatch(cfqd); } cfq_put_cooperator(cfqq); |
df5fe3e8e cfq: merge cooper... |
2570 |
|
89850f7ee [PATCH] cfq-iosch... |
2571 2572 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
2573 |
|
9b84cacd0 block, cfq: restr... |
2574 2575 2576 2577 2578 2579 |
static void cfq_init_icq(struct io_cq *icq) { struct cfq_io_cq *cic = icq_to_cic(icq); cic->ttime.last_end_request = jiffies; } |
c58698073 block, cfq: reorg... |
2580 |
static void cfq_exit_icq(struct io_cq *icq) |
89850f7ee [PATCH] cfq-iosch... |
2581 |
{ |
c58698073 block, cfq: reorg... |
2582 |
struct cfq_io_cq *cic = icq_to_cic(icq); |
283287a52 block, cfq: misc ... |
2583 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
4faa3c815 cfq-iosched: do n... |
2584 |
|
ff6657c6c cfq-iosched: get ... |
2585 2586 2587 |
if (cic->cfqq[BLK_RW_ASYNC]) { cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_ASYNC]); cic->cfqq[BLK_RW_ASYNC] = NULL; |
12a057321 [PATCH] keep sync... |
2588 |
} |
ff6657c6c cfq-iosched: get ... |
2589 2590 2591 |
if (cic->cfqq[BLK_RW_SYNC]) { cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_SYNC]); cic->cfqq[BLK_RW_SYNC] = NULL; |
12a057321 [PATCH] keep sync... |
2592 |
} |
89850f7ee [PATCH] cfq-iosch... |
2593 |
} |
fd0928df9 ioprio: move io p... |
2594 |
static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc) |
22e2c507c [PATCH] Update cf... |
2595 2596 2597 |
{ struct task_struct *tsk = current; int ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
2598 |
if (!cfq_cfqq_prio_changed(cfqq)) |
22e2c507c [PATCH] Update cf... |
2599 |
return; |
fd0928df9 ioprio: move io p... |
2600 |
ioprio_class = IOPRIO_PRIO_CLASS(ioc->ioprio); |
22e2c507c [PATCH] Update cf... |
2601 |
switch (ioprio_class) { |
fe094d98e cfq-iosched: make... |
2602 2603 2604 2605 2606 |
default: printk(KERN_ERR "cfq: bad prio %x ", ioprio_class); case IOPRIO_CLASS_NONE: /* |
6d63c2755 cfq-iosched: make... |
2607 |
* no prio set, inherit CPU scheduling settings |
fe094d98e cfq-iosched: make... |
2608 2609 |
*/ cfqq->ioprio = task_nice_ioprio(tsk); |
6d63c2755 cfq-iosched: make... |
2610 |
cfqq->ioprio_class = task_nice_ioclass(tsk); |
fe094d98e cfq-iosched: make... |
2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 |
break; case IOPRIO_CLASS_RT: cfqq->ioprio = task_ioprio(ioc); cfqq->ioprio_class = IOPRIO_CLASS_RT; break; case IOPRIO_CLASS_BE: cfqq->ioprio = task_ioprio(ioc); cfqq->ioprio_class = IOPRIO_CLASS_BE; break; case IOPRIO_CLASS_IDLE: cfqq->ioprio_class = IOPRIO_CLASS_IDLE; cfqq->ioprio = 7; cfq_clear_cfqq_idle_window(cfqq); break; |
22e2c507c [PATCH] Update cf... |
2625 2626 2627 2628 2629 2630 2631 |
} /* * keep track of original prio settings in case we have to temporarily * elevate the priority of this queue */ cfqq->org_ioprio = cfqq->ioprio; |
3b18152c3 [PATCH] CFQ io sc... |
2632 |
cfq_clear_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
2633 |
} |
c58698073 block, cfq: reorg... |
2634 |
static void changed_ioprio(struct cfq_io_cq *cic) |
22e2c507c [PATCH] Update cf... |
2635 |
{ |
bca4b914b cfq-iosched: remo... |
2636 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
478a82b0e [PATCH] switch to... |
2637 |
struct cfq_queue *cfqq; |
35e6077cb [PATCH] cfq-iosch... |
2638 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
2639 2640 |
if (unlikely(!cfqd)) return; |
ff6657c6c cfq-iosched: get ... |
2641 |
cfqq = cic->cfqq[BLK_RW_ASYNC]; |
caaa5f9f0 [PATCH] cfq-iosch... |
2642 2643 |
if (cfqq) { struct cfq_queue *new_cfqq; |
c58698073 block, cfq: reorg... |
2644 |
new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic->icq.ioc, |
ff6657c6c cfq-iosched: get ... |
2645 |
GFP_ATOMIC); |
caaa5f9f0 [PATCH] cfq-iosch... |
2646 |
if (new_cfqq) { |
ff6657c6c cfq-iosched: get ... |
2647 |
cic->cfqq[BLK_RW_ASYNC] = new_cfqq; |
caaa5f9f0 [PATCH] cfq-iosch... |
2648 2649 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
2650 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
2651 |
|
ff6657c6c cfq-iosched: get ... |
2652 |
cfqq = cic->cfqq[BLK_RW_SYNC]; |
caaa5f9f0 [PATCH] cfq-iosch... |
2653 2654 |
if (cfqq) cfq_mark_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
2655 |
} |
d5036d770 cfq-iosched: move... |
2656 |
static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
2657 |
pid_t pid, bool is_sync) |
d5036d770 cfq-iosched: move... |
2658 2659 2660 2661 |
{ RB_CLEAR_NODE(&cfqq->rb_node); RB_CLEAR_NODE(&cfqq->p_node); INIT_LIST_HEAD(&cfqq->fifo); |
30d7b9448 block cfq: don't ... |
2662 |
cfqq->ref = 0; |
d5036d770 cfq-iosched: move... |
2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 |
cfqq->cfqd = cfqd; cfq_mark_cfqq_prio_changed(cfqq); if (is_sync) { if (!cfq_class_idle(cfqq)) cfq_mark_cfqq_idle_window(cfqq); cfq_mark_cfqq_sync(cfqq); } cfqq->pid = pid; } |
24610333d blkio: Drop the r... |
2674 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
c58698073 block, cfq: reorg... |
2675 |
static void changed_cgroup(struct cfq_io_cq *cic) |
24610333d blkio: Drop the r... |
2676 2677 |
{ struct cfq_queue *sync_cfqq = cic_to_cfqq(cic, 1); |
bca4b914b cfq-iosched: remo... |
2678 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
24610333d blkio: Drop the r... |
2679 2680 2681 2682 2683 2684 |
struct request_queue *q; if (unlikely(!cfqd)) return; q = cfqd->queue; |
24610333d blkio: Drop the r... |
2685 2686 2687 2688 2689 2690 2691 2692 2693 |
if (sync_cfqq) { /* * Drop reference to sync queue. A new sync queue will be * assigned in new group upon arrival of a fresh request. */ cfq_log_cfqq(cfqd, sync_cfqq, "changed cgroup"); cic_set_cfqq(cic, NULL, 1); cfq_put_queue(sync_cfqq); } |
24610333d blkio: Drop the r... |
2694 |
} |
24610333d blkio: Drop the r... |
2695 |
#endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
22e2c507c [PATCH] Update cf... |
2696 |
static struct cfq_queue * |
a6151c3a5 cfq-iosched: appl... |
2697 |
cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync, |
fd0928df9 ioprio: move io p... |
2698 |
struct io_context *ioc, gfp_t gfp_mask) |
22e2c507c [PATCH] Update cf... |
2699 |
{ |
22e2c507c [PATCH] Update cf... |
2700 |
struct cfq_queue *cfqq, *new_cfqq = NULL; |
c58698073 block, cfq: reorg... |
2701 |
struct cfq_io_cq *cic; |
cdb16e8f7 blkio: Introduce ... |
2702 |
struct cfq_group *cfqg; |
22e2c507c [PATCH] Update cf... |
2703 2704 |
retry: |
3e59cf9d6 cfq-iosched: Get ... |
2705 |
cfqg = cfq_get_cfqg(cfqd); |
4ac845a2e block: cfq: make ... |
2706 |
cic = cfq_cic_lookup(cfqd, ioc); |
91fac317a cfq-iosched: get ... |
2707 2708 |
/* cic always exists here */ cfqq = cic_to_cfqq(cic, is_sync); |
22e2c507c [PATCH] Update cf... |
2709 |
|
6118b70b3 cfq-iosched: get ... |
2710 2711 2712 2713 2714 2715 |
/* * Always try a new alloc if we fell back to the OOM cfqq * originally, since it should just be a temporary situation. */ if (!cfqq || cfqq == &cfqd->oom_cfqq) { cfqq = NULL; |
22e2c507c [PATCH] Update cf... |
2716 2717 2718 2719 2720 |
if (new_cfqq) { cfqq = new_cfqq; new_cfqq = NULL; } else if (gfp_mask & __GFP_WAIT) { spin_unlock_irq(cfqd->queue->queue_lock); |
94f6030ca Slab allocators: ... |
2721 |
new_cfqq = kmem_cache_alloc_node(cfq_pool, |
6118b70b3 cfq-iosched: get ... |
2722 |
gfp_mask | __GFP_ZERO, |
94f6030ca Slab allocators: ... |
2723 |
cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
2724 |
spin_lock_irq(cfqd->queue->queue_lock); |
6118b70b3 cfq-iosched: get ... |
2725 2726 |
if (new_cfqq) goto retry; |
22e2c507c [PATCH] Update cf... |
2727 |
} else { |
94f6030ca Slab allocators: ... |
2728 2729 2730 |
cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask | __GFP_ZERO, cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
2731 |
} |
6118b70b3 cfq-iosched: get ... |
2732 2733 2734 |
if (cfqq) { cfq_init_cfqq(cfqd, cfqq, current->pid, is_sync); cfq_init_prio_data(cfqq, ioc); |
cdb16e8f7 blkio: Introduce ... |
2735 |
cfq_link_cfqq_cfqg(cfqq, cfqg); |
6118b70b3 cfq-iosched: get ... |
2736 2737 2738 |
cfq_log_cfqq(cfqd, cfqq, "alloced"); } else cfqq = &cfqd->oom_cfqq; |
22e2c507c [PATCH] Update cf... |
2739 2740 2741 2742 |
} if (new_cfqq) kmem_cache_free(cfq_pool, new_cfqq); |
22e2c507c [PATCH] Update cf... |
2743 2744 |
return cfqq; } |
c2dea2d1f cfq: async queue ... |
2745 2746 2747 |
static struct cfq_queue ** cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio) { |
fe094d98e cfq-iosched: make... |
2748 |
switch (ioprio_class) { |
c2dea2d1f cfq: async queue ... |
2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 |
case IOPRIO_CLASS_RT: return &cfqd->async_cfqq[0][ioprio]; case IOPRIO_CLASS_BE: return &cfqd->async_cfqq[1][ioprio]; case IOPRIO_CLASS_IDLE: return &cfqd->async_idle_cfqq; default: BUG(); } } |
15c31be4d cfq-iosched: fix ... |
2759 |
static struct cfq_queue * |
a6151c3a5 cfq-iosched: appl... |
2760 |
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc, |
15c31be4d cfq-iosched: fix ... |
2761 2762 |
gfp_t gfp_mask) { |
fd0928df9 ioprio: move io p... |
2763 2764 |
const int ioprio = task_ioprio(ioc); const int ioprio_class = task_ioprio_class(ioc); |
c2dea2d1f cfq: async queue ... |
2765 |
struct cfq_queue **async_cfqq = NULL; |
15c31be4d cfq-iosched: fix ... |
2766 |
struct cfq_queue *cfqq = NULL; |
c2dea2d1f cfq: async queue ... |
2767 2768 2769 2770 |
if (!is_sync) { async_cfqq = cfq_async_queue_prio(cfqd, ioprio_class, ioprio); cfqq = *async_cfqq; } |
6118b70b3 cfq-iosched: get ... |
2771 |
if (!cfqq) |
fd0928df9 ioprio: move io p... |
2772 |
cfqq = cfq_find_alloc_queue(cfqd, is_sync, ioc, gfp_mask); |
15c31be4d cfq-iosched: fix ... |
2773 2774 2775 2776 |
/* * pin the queue now that it's allocated, scheduler exit will prune it */ |
c2dea2d1f cfq: async queue ... |
2777 |
if (!is_sync && !(*async_cfqq)) { |
30d7b9448 block cfq: don't ... |
2778 |
cfqq->ref++; |
c2dea2d1f cfq: async queue ... |
2779 |
*async_cfqq = cfqq; |
15c31be4d cfq-iosched: fix ... |
2780 |
} |
30d7b9448 block cfq: don't ... |
2781 |
cfqq->ref++; |
15c31be4d cfq-iosched: fix ... |
2782 2783 |
return cfqq; } |
22e2c507c [PATCH] Update cf... |
2784 |
static void |
383cd7213 CFQ: move think t... |
2785 |
__cfq_update_io_thinktime(struct cfq_ttime *ttime, unsigned long slice_idle) |
1da177e4c Linux-2.6.12-rc2 |
2786 |
{ |
383cd7213 CFQ: move think t... |
2787 2788 |
unsigned long elapsed = jiffies - ttime->last_end_request; elapsed = min(elapsed, 2UL * slice_idle); |
db3b5848e When cfq I/O sche... |
2789 |
|
383cd7213 CFQ: move think t... |
2790 2791 2792 2793 2794 2795 2796 |
ttime->ttime_samples = (7*ttime->ttime_samples + 256) / 8; ttime->ttime_total = (7*ttime->ttime_total + 256*elapsed) / 8; ttime->ttime_mean = (ttime->ttime_total + 128) / ttime->ttime_samples; } static void cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
c58698073 block, cfq: reorg... |
2797 |
struct cfq_io_cq *cic) |
383cd7213 CFQ: move think t... |
2798 |
{ |
f5f2b6ceb CFQ: add think ti... |
2799 |
if (cfq_cfqq_sync(cfqq)) { |
383cd7213 CFQ: move think t... |
2800 |
__cfq_update_io_thinktime(&cic->ttime, cfqd->cfq_slice_idle); |
f5f2b6ceb CFQ: add think ti... |
2801 2802 2803 |
__cfq_update_io_thinktime(&cfqq->service_tree->ttime, cfqd->cfq_slice_idle); } |
7700fc4f6 CFQ: add think ti... |
2804 2805 2806 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED __cfq_update_io_thinktime(&cfqq->cfqg->ttime, cfqd->cfq_group_idle); #endif |
22e2c507c [PATCH] Update cf... |
2807 |
} |
1da177e4c Linux-2.6.12-rc2 |
2808 |
|
206dc69b3 [BLOCK] cfq-iosch... |
2809 |
static void |
b2c18e1e0 cfq: calculate th... |
2810 |
cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
6d048f531 cfq-iosched: deve... |
2811 |
struct request *rq) |
206dc69b3 [BLOCK] cfq-iosch... |
2812 |
{ |
3dde36dde cfq-iosched: rewo... |
2813 |
sector_t sdist = 0; |
41647e7a9 cfq-iosched: reth... |
2814 |
sector_t n_sec = blk_rq_sectors(rq); |
3dde36dde cfq-iosched: rewo... |
2815 2816 2817 2818 2819 2820 |
if (cfqq->last_request_pos) { if (cfqq->last_request_pos < blk_rq_pos(rq)) sdist = blk_rq_pos(rq) - cfqq->last_request_pos; else sdist = cfqq->last_request_pos - blk_rq_pos(rq); } |
206dc69b3 [BLOCK] cfq-iosch... |
2821 |
|
3dde36dde cfq-iosched: rewo... |
2822 |
cfqq->seek_history <<= 1; |
41647e7a9 cfq-iosched: reth... |
2823 2824 2825 2826 |
if (blk_queue_nonrot(cfqd->queue)) cfqq->seek_history |= (n_sec < CFQQ_SECT_THR_NONROT); else cfqq->seek_history |= (sdist > CFQQ_SEEK_THR); |
206dc69b3 [BLOCK] cfq-iosch... |
2827 |
} |
1da177e4c Linux-2.6.12-rc2 |
2828 |
|
22e2c507c [PATCH] Update cf... |
2829 2830 2831 2832 2833 2834 |
/* * Disable idle window if the process thinks too long or seeks so much that * it doesn't matter */ static void cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
c58698073 block, cfq: reorg... |
2835 |
struct cfq_io_cq *cic) |
22e2c507c [PATCH] Update cf... |
2836 |
{ |
7b679138b cfq-iosched: add ... |
2837 |
int old_idle, enable_idle; |
1be92f2fc cfq-iosched: neve... |
2838 |
|
0871714e0 cfq-iosched: rela... |
2839 2840 2841 2842 |
/* * Don't idle for async or idle io prio class */ if (!cfq_cfqq_sync(cfqq) || cfq_class_idle(cfqq)) |
1be92f2fc cfq-iosched: neve... |
2843 |
return; |
c265a7f41 cfq-iosched: get ... |
2844 |
enable_idle = old_idle = cfq_cfqq_idle_window(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
2845 |
|
76280aff1 cfq-iosched: idli... |
2846 2847 |
if (cfqq->queued[0] + cfqq->queued[1] >= 4) cfq_mark_cfqq_deep(cfqq); |
749ef9f84 cfq: improve fsyn... |
2848 2849 |
if (cfqq->next_rq && (cfqq->next_rq->cmd_flags & REQ_NOIDLE)) enable_idle = 0; |
c58698073 block, cfq: reorg... |
2850 2851 2852 |
else if (!atomic_read(&cic->icq.ioc->nr_tasks) || !cfqd->cfq_slice_idle || (!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq))) |
22e2c507c [PATCH] Update cf... |
2853 |
enable_idle = 0; |
383cd7213 CFQ: move think t... |
2854 2855 |
else if (sample_valid(cic->ttime.ttime_samples)) { if (cic->ttime.ttime_mean > cfqd->cfq_slice_idle) |
22e2c507c [PATCH] Update cf... |
2856 2857 2858 |
enable_idle = 0; else enable_idle = 1; |
1da177e4c Linux-2.6.12-rc2 |
2859 |
} |
7b679138b cfq-iosched: add ... |
2860 2861 2862 2863 2864 2865 2866 |
if (old_idle != enable_idle) { cfq_log_cfqq(cfqd, cfqq, "idle=%d", enable_idle); if (enable_idle) cfq_mark_cfqq_idle_window(cfqq); else cfq_clear_cfqq_idle_window(cfqq); } |
22e2c507c [PATCH] Update cf... |
2867 |
} |
1da177e4c Linux-2.6.12-rc2 |
2868 |
|
22e2c507c [PATCH] Update cf... |
2869 2870 2871 2872 |
/* * Check if new_cfqq should preempt the currently active queue. Return 0 for * no or if we aren't sure, a 1 will cause a preempt. */ |
a6151c3a5 cfq-iosched: appl... |
2873 |
static bool |
22e2c507c [PATCH] Update cf... |
2874 |
cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, |
5e7053747 [PATCH] cfq-iosch... |
2875 |
struct request *rq) |
22e2c507c [PATCH] Update cf... |
2876 |
{ |
6d048f531 cfq-iosched: deve... |
2877 |
struct cfq_queue *cfqq; |
22e2c507c [PATCH] Update cf... |
2878 |
|
6d048f531 cfq-iosched: deve... |
2879 2880 |
cfqq = cfqd->active_queue; if (!cfqq) |
a6151c3a5 cfq-iosched: appl... |
2881 |
return false; |
22e2c507c [PATCH] Update cf... |
2882 |
|
6d048f531 cfq-iosched: deve... |
2883 |
if (cfq_class_idle(new_cfqq)) |
a6151c3a5 cfq-iosched: appl... |
2884 |
return false; |
22e2c507c [PATCH] Update cf... |
2885 2886 |
if (cfq_class_idle(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
2887 |
return true; |
1e3335de0 cfq-iosched: impr... |
2888 |
|
22e2c507c [PATCH] Update cf... |
2889 |
/* |
875feb63b cfq-iosched: Resp... |
2890 2891 2892 2893 2894 2895 |
* Don't allow a non-RT request to preempt an ongoing RT cfqq timeslice. */ if (cfq_class_rt(cfqq) && !cfq_class_rt(new_cfqq)) return false; /* |
374f84ac3 [PATCH] cfq-iosch... |
2896 2897 2898 |
* if the new request is sync, but the currently running queue is * not, let the sync request have priority. */ |
5e7053747 [PATCH] cfq-iosch... |
2899 |
if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
2900 |
return true; |
1e3335de0 cfq-iosched: impr... |
2901 |
|
8682e1f15 blkio: Provide so... |
2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 |
if (new_cfqq->cfqg != cfqq->cfqg) return false; if (cfq_slice_used(cfqq)) return true; /* Allow preemption only if we are idling on sync-noidle tree */ if (cfqd->serving_type == SYNC_NOIDLE_WORKLOAD && cfqq_type(new_cfqq) == SYNC_NOIDLE_WORKLOAD && new_cfqq->service_tree->count == 2 && RB_EMPTY_ROOT(&cfqq->sort_list)) return true; |
374f84ac3 [PATCH] cfq-iosch... |
2914 |
/* |
b53d1ed73 Revert "cfq: Remo... |
2915 2916 2917 |
* So both queues are sync. Let the new request get disk time if * it's a metadata request and the current queue is doing regular IO. */ |
65299a3b7 block: separate p... |
2918 |
if ((rq->cmd_flags & REQ_PRIO) && !cfqq->prio_pending) |
b53d1ed73 Revert "cfq: Remo... |
2919 2920 2921 |
return true; /* |
3a9a3f6cc cfq-iosched: Allo... |
2922 2923 2924 |
* Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice. */ if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
2925 |
return true; |
3a9a3f6cc cfq-iosched: Allo... |
2926 |
|
d2d59e18a cfq-iosched: sche... |
2927 2928 2929 |
/* An idle queue should not be idle now for some reason */ if (RB_EMPTY_ROOT(&cfqq->sort_list) && !cfq_should_idle(cfqd, cfqq)) return true; |
1e3335de0 cfq-iosched: impr... |
2930 |
if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
2931 |
return false; |
1e3335de0 cfq-iosched: impr... |
2932 2933 2934 2935 2936 |
/* * if this request is as-good as one we would expect from the * current cfqq, let it preempt */ |
e9ce335df cfq-iosched: fix ... |
2937 |
if (cfq_rq_close(cfqd, cfqq, rq)) |
a6151c3a5 cfq-iosched: appl... |
2938 |
return true; |
1e3335de0 cfq-iosched: impr... |
2939 |
|
a6151c3a5 cfq-iosched: appl... |
2940 |
return false; |
22e2c507c [PATCH] Update cf... |
2941 2942 2943 2944 2945 2946 2947 2948 |
} /* * cfqq preempts the active queue. if we allowed preempt with no slice left, * let it have half of its nominal slice. */ static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
f8ae6e3eb block cfq: make q... |
2949 |
struct cfq_queue *old_cfqq = cfqd->active_queue; |
7b679138b cfq-iosched: add ... |
2950 |
cfq_log_cfqq(cfqd, cfqq, "preempt"); |
e5ff082e8 blkio: Fix anothe... |
2951 |
cfq_slice_expired(cfqd, 1); |
22e2c507c [PATCH] Update cf... |
2952 |
|
bf5722567 [PATCH] cfq-iosch... |
2953 |
/* |
f8ae6e3eb block cfq: make q... |
2954 2955 2956 2957 2958 2959 2960 |
* workload type is changed, don't save slice, otherwise preempt * doesn't happen */ if (cfqq_type(old_cfqq) != cfqq_type(cfqq)) cfqq->cfqg->saved_workload_slice = 0; /* |
bf5722567 [PATCH] cfq-iosch... |
2961 2962 2963 2964 |
* Put the new queue at the front of the of the current list, * so we know that it will be selected next. */ BUG_ON(!cfq_cfqq_on_rr(cfqq)); |
edd75ffd9 cfq-iosched: get ... |
2965 2966 |
cfq_service_tree_add(cfqd, cfqq, 1); |
eda5e0c91 cfq-iosched: Don'... |
2967 |
|
62a37f6ba cfq-iosched: Don'... |
2968 2969 |
cfqq->slice_end = 0; cfq_mark_cfqq_slice_new(cfqq); |
22e2c507c [PATCH] Update cf... |
2970 2971 2972 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
2973 |
* Called when a new fs request (rq) is added (to cfqq). Check if there's |
22e2c507c [PATCH] Update cf... |
2974 2975 2976 |
* something we should do about it */ static void |
5e7053747 [PATCH] cfq-iosch... |
2977 2978 |
cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *rq) |
22e2c507c [PATCH] Update cf... |
2979 |
{ |
c58698073 block, cfq: reorg... |
2980 |
struct cfq_io_cq *cic = RQ_CIC(rq); |
12e9fddd6 [PATCH] cfq-iosch... |
2981 |
|
45333d5a3 cfq-iosched: fix ... |
2982 |
cfqd->rq_queued++; |
65299a3b7 block: separate p... |
2983 2984 |
if (rq->cmd_flags & REQ_PRIO) cfqq->prio_pending++; |
374f84ac3 [PATCH] cfq-iosch... |
2985 |
|
383cd7213 CFQ: move think t... |
2986 |
cfq_update_io_thinktime(cfqd, cfqq, cic); |
b2c18e1e0 cfq: calculate th... |
2987 |
cfq_update_io_seektime(cfqd, cfqq, rq); |
9c2c38a12 [PATCH] cfq-iosch... |
2988 |
cfq_update_idle_window(cfqd, cfqq, cic); |
b2c18e1e0 cfq: calculate th... |
2989 |
cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq); |
22e2c507c [PATCH] Update cf... |
2990 2991 2992 |
if (cfqq == cfqd->active_queue) { /* |
b029195dd cfq-iosched: don'... |
2993 2994 2995 |
* Remember that we saw a request from this process, but * don't start queuing just yet. Otherwise we risk seeing lots * of tiny requests, because we disrupt the normal plugging |
d6ceb25e8 cfq-iosched: don'... |
2996 2997 |
* and merging. If the request is already larger than a single * page, let it rip immediately. For that case we assume that |
2d8707229 cfq-iosched: twea... |
2998 2999 3000 |
* merging is already done. Ditto for a busy system that * has other work pending, don't risk delaying until the * idle timer unplug to continue working. |
22e2c507c [PATCH] Update cf... |
3001 |
*/ |
d6ceb25e8 cfq-iosched: don'... |
3002 |
if (cfq_cfqq_wait_request(cfqq)) { |
2d8707229 cfq-iosched: twea... |
3003 3004 |
if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE || cfqd->busy_queues > 1) { |
812df48d1 blkio: Add more d... |
3005 |
cfq_del_timer(cfqd, cfqq); |
554554f60 cfq: Remove wait_... |
3006 |
cfq_clear_cfqq_wait_request(cfqq); |
24ecfbe27 block: add blk_ru... |
3007 |
__blk_run_queue(cfqd->queue); |
a11cdaa7a block: Update to ... |
3008 |
} else { |
e98ef89b3 cfq-iosched: Fixe... |
3009 |
cfq_blkiocg_update_idle_time_stats( |
a11cdaa7a block: Update to ... |
3010 |
&cfqq->cfqg->blkg); |
bf7919371 blkio: Set must_d... |
3011 |
cfq_mark_cfqq_must_dispatch(cfqq); |
a11cdaa7a block: Update to ... |
3012 |
} |
d6ceb25e8 cfq-iosched: don'... |
3013 |
} |
5e7053747 [PATCH] cfq-iosch... |
3014 |
} else if (cfq_should_preempt(cfqd, cfqq, rq)) { |
22e2c507c [PATCH] Update cf... |
3015 3016 3017 |
/* * not the active queue - expire current slice if it is * idle and has expired it's mean thinktime or this new queue |
3a9a3f6cc cfq-iosched: Allo... |
3018 3019 |
* has some old slice time left and is of higher priority or * this new queue is RT and the current one is BE |
22e2c507c [PATCH] Update cf... |
3020 3021 |
*/ cfq_preempt_queue(cfqd, cfqq); |
24ecfbe27 block: add blk_ru... |
3022 |
__blk_run_queue(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
3023 |
} |
1da177e4c Linux-2.6.12-rc2 |
3024 |
} |
165125e1e [BLOCK] Get rid o... |
3025 |
static void cfq_insert_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3026 |
{ |
b4878f245 [PATCH] 02/05: up... |
3027 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
3028 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
3029 |
|
7b679138b cfq-iosched: add ... |
3030 |
cfq_log_cfqq(cfqd, cfqq, "insert_request"); |
c58698073 block, cfq: reorg... |
3031 |
cfq_init_prio_data(cfqq, RQ_CIC(rq)->icq.ioc); |
1da177e4c Linux-2.6.12-rc2 |
3032 |
|
30996f40b cfq-iosched: fix ... |
3033 |
rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]); |
22e2c507c [PATCH] Update cf... |
3034 |
list_add_tail(&rq->queuelist, &cfqq->fifo); |
aa6f6a3de cfq-iosched: prep... |
3035 |
cfq_add_rq_rb(rq); |
e98ef89b3 cfq-iosched: Fixe... |
3036 |
cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg, |
cdc1184cf blkio: Add io_que... |
3037 3038 |
&cfqd->serving_group->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
5e7053747 [PATCH] cfq-iosch... |
3039 |
cfq_rq_enqueued(cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
3040 |
} |
45333d5a3 cfq-iosched: fix ... |
3041 3042 3043 3044 3045 3046 |
/* * Update hw_tag based on peak queue depth over 50 samples under * sufficient load. */ static void cfq_update_hw_tag(struct cfq_data *cfqd) { |
1a1238a7d cfq-iosched: impr... |
3047 |
struct cfq_queue *cfqq = cfqd->active_queue; |
53c583d22 cfq-iosched: requ... |
3048 3049 |
if (cfqd->rq_in_driver > cfqd->hw_tag_est_depth) cfqd->hw_tag_est_depth = cfqd->rq_in_driver; |
e459dd08f cfq-iosched: fix ... |
3050 3051 3052 |
if (cfqd->hw_tag == 1) return; |
45333d5a3 cfq-iosched: fix ... |
3053 3054 |
if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN && |
53c583d22 cfq-iosched: requ... |
3055 |
cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3056 |
return; |
1a1238a7d cfq-iosched: impr... |
3057 3058 3059 3060 3061 3062 3063 |
/* * If active queue hasn't enough requests and can idle, cfq might not * dispatch sufficient requests to hardware. Don't zero hw_tag in this * case */ if (cfqq && cfq_cfqq_idle_window(cfqq) && cfqq->dispatched + cfqq->queued[0] + cfqq->queued[1] < |
53c583d22 cfq-iosched: requ... |
3064 |
CFQ_HW_QUEUE_MIN && cfqd->rq_in_driver < CFQ_HW_QUEUE_MIN) |
1a1238a7d cfq-iosched: impr... |
3065 |
return; |
45333d5a3 cfq-iosched: fix ... |
3066 3067 |
if (cfqd->hw_tag_samples++ < 50) return; |
e459dd08f cfq-iosched: fix ... |
3068 |
if (cfqd->hw_tag_est_depth >= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3069 3070 3071 |
cfqd->hw_tag = 1; else cfqd->hw_tag = 0; |
45333d5a3 cfq-iosched: fix ... |
3072 |
} |
7667aa063 cfq-iosched: Take... |
3073 3074 |
static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
c58698073 block, cfq: reorg... |
3075 |
struct cfq_io_cq *cic = cfqd->active_cic; |
7667aa063 cfq-iosched: Take... |
3076 |
|
02a8f01b5 cfq-iosched: Don'... |
3077 3078 3079 |
/* If the queue already has requests, don't wait */ if (!RB_EMPTY_ROOT(&cfqq->sort_list)) return false; |
7667aa063 cfq-iosched: Take... |
3080 3081 3082 |
/* If there are other queues in the group, don't wait */ if (cfqq->cfqg->nr_cfqq > 1) return false; |
7700fc4f6 CFQ: add think ti... |
3083 3084 3085 |
/* the only queue in the group, but think time is big */ if (cfq_io_thinktime_big(cfqd, &cfqq->cfqg->ttime, true)) return false; |
7667aa063 cfq-iosched: Take... |
3086 3087 3088 3089 |
if (cfq_slice_used(cfqq)) return true; /* if slice left is less than think time, wait busy */ |
383cd7213 CFQ: move think t... |
3090 3091 |
if (cic && sample_valid(cic->ttime.ttime_samples) && (cfqq->slice_end - jiffies < cic->ttime.ttime_mean)) |
7667aa063 cfq-iosched: Take... |
3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 |
return true; /* * If think times is less than a jiffy than ttime_mean=0 and above * will not be true. It might happen that slice has not expired yet * but will expire soon (4-5 ns) during select_queue(). To cover the * case where think time is less than a jiffy, mark the queue wait * busy if only 1 jiffy is left in the slice. */ if (cfqq->slice_end - jiffies == 1) return true; return false; } |
165125e1e [BLOCK] Get rid o... |
3106 |
static void cfq_completed_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3107 |
{ |
5e7053747 [PATCH] cfq-iosch... |
3108 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
3109 |
struct cfq_data *cfqd = cfqq->cfqd; |
5380a101d [PATCH] cfq-iosch... |
3110 |
const int sync = rq_is_sync(rq); |
b4878f245 [PATCH] 02/05: up... |
3111 |
unsigned long now; |
1da177e4c Linux-2.6.12-rc2 |
3112 |
|
b4878f245 [PATCH] 02/05: up... |
3113 |
now = jiffies; |
33659ebba block: remove wra... |
3114 3115 |
cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d", !!(rq->cmd_flags & REQ_NOIDLE)); |
1da177e4c Linux-2.6.12-rc2 |
3116 |
|
45333d5a3 cfq-iosched: fix ... |
3117 |
cfq_update_hw_tag(cfqd); |
53c583d22 cfq-iosched: requ... |
3118 |
WARN_ON(!cfqd->rq_in_driver); |
6d048f531 cfq-iosched: deve... |
3119 |
WARN_ON(!cfqq->dispatched); |
53c583d22 cfq-iosched: requ... |
3120 |
cfqd->rq_in_driver--; |
6d048f531 cfq-iosched: deve... |
3121 |
cfqq->dispatched--; |
80bdf0c78 cfq-iosched: Impl... |
3122 |
(RQ_CFQG(rq))->dispatched--; |
e98ef89b3 cfq-iosched: Fixe... |
3123 3124 3125 |
cfq_blkiocg_update_completion_stats(&cfqq->cfqg->blkg, rq_start_time_ns(rq), rq_io_start_time_ns(rq), rq_data_dir(rq), rq_is_sync(rq)); |
1da177e4c Linux-2.6.12-rc2 |
3126 |
|
53c583d22 cfq-iosched: requ... |
3127 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--; |
3ed9a2965 cfq-iosched: impr... |
3128 |
|
365722bb9 cfq-iosched: dela... |
3129 |
if (sync) { |
f5f2b6ceb CFQ: add think ti... |
3130 |
struct cfq_rb_root *service_tree; |
383cd7213 CFQ: move think t... |
3131 |
RQ_CIC(rq)->ttime.last_end_request = now; |
f5f2b6ceb CFQ: add think ti... |
3132 3133 3134 3135 3136 3137 3138 |
if (cfq_cfqq_on_rr(cfqq)) service_tree = cfqq->service_tree; else service_tree = service_tree_for(cfqq->cfqg, cfqq_prio(cfqq), cfqq_type(cfqq)); service_tree->ttime.last_end_request = now; |
573412b29 cfq-iosched: redu... |
3139 3140 |
if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now)) cfqd->last_delayed_sync = now; |
365722bb9 cfq-iosched: dela... |
3141 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
3142 |
|
7700fc4f6 CFQ: add think ti... |
3143 3144 3145 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED cfqq->cfqg->ttime.last_end_request = now; #endif |
caaa5f9f0 [PATCH] cfq-iosch... |
3146 3147 3148 3149 3150 |
/* * If this is the active queue, check if it needs to be expired, * or if we want to idle in case it has no pending requests. */ if (cfqd->active_queue == cfqq) { |
a36e71f99 cfq-iosched: add ... |
3151 |
const bool cfqq_empty = RB_EMPTY_ROOT(&cfqq->sort_list); |
44f7c1606 cfq-iosched: defe... |
3152 3153 3154 3155 |
if (cfq_cfqq_slice_new(cfqq)) { cfq_set_prio_slice(cfqd, cfqq); cfq_clear_cfqq_slice_new(cfqq); } |
f75edf2dc blkio: Wait for c... |
3156 3157 |
/* |
7667aa063 cfq-iosched: Take... |
3158 3159 |
* Should we wait for next request to come in before we expire * the queue. |
f75edf2dc blkio: Wait for c... |
3160 |
*/ |
7667aa063 cfq-iosched: Take... |
3161 |
if (cfq_should_wait_busy(cfqd, cfqq)) { |
80bdf0c78 cfq-iosched: Impl... |
3162 3163 3164 3165 |
unsigned long extend_sl = cfqd->cfq_slice_idle; if (!cfqd->cfq_slice_idle) extend_sl = cfqd->cfq_group_idle; cfqq->slice_end = jiffies + extend_sl; |
f75edf2dc blkio: Wait for c... |
3166 |
cfq_mark_cfqq_wait_busy(cfqq); |
b1ffe737f cfq-iosched: Add ... |
3167 |
cfq_log_cfqq(cfqd, cfqq, "will busy wait"); |
f75edf2dc blkio: Wait for c... |
3168 |
} |
a36e71f99 cfq-iosched: add ... |
3169 |
/* |
8e550632c cfq-iosched: fix ... |
3170 3171 3172 3173 3174 3175 |
* Idling is not enabled on: * - expired queues * - idle-priority queues * - async queues * - queues with still some requests queued * - when there is a close cooperator |
a36e71f99 cfq-iosched: add ... |
3176 |
*/ |
0871714e0 cfq-iosched: rela... |
3177 |
if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq)) |
e5ff082e8 blkio: Fix anothe... |
3178 |
cfq_slice_expired(cfqd, 1); |
8e550632c cfq-iosched: fix ... |
3179 3180 |
else if (sync && cfqq_empty && !cfq_close_cooperator(cfqd, cfqq)) { |
749ef9f84 cfq: improve fsyn... |
3181 |
cfq_arm_slice_timer(cfqd); |
8e550632c cfq-iosched: fix ... |
3182 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
3183 |
} |
6d048f531 cfq-iosched: deve... |
3184 |
|
53c583d22 cfq-iosched: requ... |
3185 |
if (!cfqd->rq_in_driver) |
23e018a1b block: get rid of... |
3186 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
3187 |
} |
89850f7ee [PATCH] cfq-iosch... |
3188 |
static inline int __cfq_may_queue(struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
3189 |
{ |
1b379d8da cfq-iosched: get ... |
3190 |
if (cfq_cfqq_wait_request(cfqq) && !cfq_cfqq_must_alloc_slice(cfqq)) { |
3b18152c3 [PATCH] CFQ io sc... |
3191 |
cfq_mark_cfqq_must_alloc_slice(cfqq); |
22e2c507c [PATCH] Update cf... |
3192 |
return ELV_MQUEUE_MUST; |
3b18152c3 [PATCH] CFQ io sc... |
3193 |
} |
1da177e4c Linux-2.6.12-rc2 |
3194 |
|
22e2c507c [PATCH] Update cf... |
3195 |
return ELV_MQUEUE_MAY; |
22e2c507c [PATCH] Update cf... |
3196 |
} |
165125e1e [BLOCK] Get rid o... |
3197 |
static int cfq_may_queue(struct request_queue *q, int rw) |
22e2c507c [PATCH] Update cf... |
3198 3199 3200 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; |
c58698073 block, cfq: reorg... |
3201 |
struct cfq_io_cq *cic; |
22e2c507c [PATCH] Update cf... |
3202 3203 3204 3205 3206 3207 3208 3209 |
struct cfq_queue *cfqq; /* * don't force setup of a queue from here, as a call to may_queue * does not necessarily imply that a request actually will be queued. * so just lookup a possibly existing queue, or return 'may queue' * if that fails */ |
4ac845a2e block: cfq: make ... |
3210 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
3211 3212 |
if (!cic) return ELV_MQUEUE_MAY; |
b0b78f81a cfq-iosched: use ... |
3213 |
cfqq = cic_to_cfqq(cic, rw_is_sync(rw)); |
22e2c507c [PATCH] Update cf... |
3214 |
if (cfqq) { |
c58698073 block, cfq: reorg... |
3215 |
cfq_init_prio_data(cfqq, cic->icq.ioc); |
22e2c507c [PATCH] Update cf... |
3216 |
|
89850f7ee [PATCH] cfq-iosch... |
3217 |
return __cfq_may_queue(cfqq); |
22e2c507c [PATCH] Update cf... |
3218 3219 3220 |
} return ELV_MQUEUE_MAY; |
1da177e4c Linux-2.6.12-rc2 |
3221 |
} |
1da177e4c Linux-2.6.12-rc2 |
3222 3223 3224 |
/* * queue lock held here */ |
bb37b94c6 [BLOCK] Cleanup u... |
3225 |
static void cfq_put_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3226 |
{ |
5e7053747 [PATCH] cfq-iosch... |
3227 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
3228 |
|
5e7053747 [PATCH] cfq-iosch... |
3229 |
if (cfqq) { |
22e2c507c [PATCH] Update cf... |
3230 |
const int rw = rq_data_dir(rq); |
1da177e4c Linux-2.6.12-rc2 |
3231 |
|
22e2c507c [PATCH] Update cf... |
3232 3233 |
BUG_ON(!cfqq->allocated[rw]); cfqq->allocated[rw]--; |
1da177e4c Linux-2.6.12-rc2 |
3234 |
|
7f1dc8a2d blkio: Fix blkio ... |
3235 3236 |
/* Put down rq reference on cfqg */ cfq_put_cfqg(RQ_CFQG(rq)); |
a612fddf0 block, cfq: move ... |
3237 3238 |
rq->elv.priv[0] = NULL; rq->elv.priv[1] = NULL; |
7f1dc8a2d blkio: Fix blkio ... |
3239 |
|
1da177e4c Linux-2.6.12-rc2 |
3240 3241 3242 |
cfq_put_queue(cfqq); } } |
df5fe3e8e cfq: merge cooper... |
3243 |
static struct cfq_queue * |
c58698073 block, cfq: reorg... |
3244 |
cfq_merge_cfqqs(struct cfq_data *cfqd, struct cfq_io_cq *cic, |
df5fe3e8e cfq: merge cooper... |
3245 3246 3247 3248 |
struct cfq_queue *cfqq) { cfq_log_cfqq(cfqd, cfqq, "merging with queue %p", cfqq->new_cfqq); cic_set_cfqq(cic, cfqq->new_cfqq, 1); |
b3b6d0408 cfq: change the m... |
3249 |
cfq_mark_cfqq_coop(cfqq->new_cfqq); |
df5fe3e8e cfq: merge cooper... |
3250 3251 3252 |
cfq_put_queue(cfqq); return cic_to_cfqq(cic, 1); } |
e6c5bc737 cfq: break apart ... |
3253 3254 3255 3256 3257 |
/* * Returns NULL if a new cfqq should be allocated, or the old cfqq if this * was the last process referring to said cfqq. */ static struct cfq_queue * |
c58698073 block, cfq: reorg... |
3258 |
split_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq) |
e6c5bc737 cfq: break apart ... |
3259 3260 |
{ if (cfqq_process_refs(cfqq) == 1) { |
e6c5bc737 cfq: break apart ... |
3261 3262 |
cfqq->pid = current->pid; cfq_clear_cfqq_coop(cfqq); |
ae54abed6 cfq-iosched: spli... |
3263 |
cfq_clear_cfqq_split_coop(cfqq); |
e6c5bc737 cfq: break apart ... |
3264 3265 3266 3267 |
return cfqq; } cic_set_cfqq(cic, NULL, 1); |
d02a2c077 cfq-iosched: fix ... |
3268 3269 |
cfq_put_cooperator(cfqq); |
e6c5bc737 cfq: break apart ... |
3270 3271 3272 |
cfq_put_queue(cfqq); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
3273 |
/* |
22e2c507c [PATCH] Update cf... |
3274 |
* Allocate cfq data structures associated with this request. |
1da177e4c Linux-2.6.12-rc2 |
3275 |
*/ |
22e2c507c [PATCH] Update cf... |
3276 |
static int |
165125e1e [BLOCK] Get rid o... |
3277 |
cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
3278 3279 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
f1f8cc946 block, cfq: move ... |
3280 |
struct cfq_io_cq *cic = icq_to_cic(rq->elv.icq); |
1da177e4c Linux-2.6.12-rc2 |
3281 |
const int rw = rq_data_dir(rq); |
a6151c3a5 cfq-iosched: appl... |
3282 |
const bool is_sync = rq_is_sync(rq); |
22e2c507c [PATCH] Update cf... |
3283 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
3284 3285 |
might_sleep_if(gfp_mask & __GFP_WAIT); |
216284c35 block, cfq: fix r... |
3286 |
spin_lock_irq(q->queue_lock); |
f1f8cc946 block, cfq: move ... |
3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 |
/* handle changed notifications */ if (unlikely(cic->icq.changed)) { if (test_and_clear_bit(ICQ_IOPRIO_CHANGED, &cic->icq.changed)) changed_ioprio(cic); #ifdef CONFIG_CFQ_GROUP_IOSCHED if (test_and_clear_bit(ICQ_CGROUP_CHANGED, &cic->icq.changed)) changed_cgroup(cic); #endif } |
22e2c507c [PATCH] Update cf... |
3297 |
|
e6c5bc737 cfq: break apart ... |
3298 |
new_queue: |
91fac317a cfq-iosched: get ... |
3299 |
cfqq = cic_to_cfqq(cic, is_sync); |
32f2e807a cfq-iosched: rese... |
3300 |
if (!cfqq || cfqq == &cfqd->oom_cfqq) { |
c58698073 block, cfq: reorg... |
3301 |
cfqq = cfq_get_queue(cfqd, is_sync, cic->icq.ioc, gfp_mask); |
91fac317a cfq-iosched: get ... |
3302 |
cic_set_cfqq(cic, cfqq, is_sync); |
df5fe3e8e cfq: merge cooper... |
3303 3304 |
} else { /* |
e6c5bc737 cfq: break apart ... |
3305 3306 |
* If the queue was seeky for too long, break it apart. */ |
ae54abed6 cfq-iosched: spli... |
3307 |
if (cfq_cfqq_coop(cfqq) && cfq_cfqq_split_coop(cfqq)) { |
e6c5bc737 cfq: break apart ... |
3308 3309 3310 3311 3312 3313 3314 |
cfq_log_cfqq(cfqd, cfqq, "breaking apart cfqq"); cfqq = split_cfqq(cic, cfqq); if (!cfqq) goto new_queue; } /* |
df5fe3e8e cfq: merge cooper... |
3315 3316 3317 3318 3319 3320 3321 |
* Check to see if this queue is scheduled to merge with * another, closely cooperating queue. The merging of * queues happens here as it must be done in process context. * The reference on new_cfqq was taken in merge_cfqqs. */ if (cfqq->new_cfqq) cfqq = cfq_merge_cfqqs(cfqd, cic, cfqq); |
91fac317a cfq-iosched: get ... |
3322 |
} |
1da177e4c Linux-2.6.12-rc2 |
3323 3324 |
cfqq->allocated[rw]++; |
1da177e4c Linux-2.6.12-rc2 |
3325 |
|
6fae9c251 Merge commit 'v2.... |
3326 |
cfqq->ref++; |
a612fddf0 block, cfq: move ... |
3327 3328 |
rq->elv.priv[0] = cfqq; rq->elv.priv[1] = cfq_ref_get_cfqg(cfqq->cfqg); |
216284c35 block, cfq: fix r... |
3329 |
spin_unlock_irq(q->queue_lock); |
5e7053747 [PATCH] cfq-iosch... |
3330 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3331 |
} |
65f27f384 WorkStruct: Pass ... |
3332 |
static void cfq_kick_queue(struct work_struct *work) |
22e2c507c [PATCH] Update cf... |
3333 |
{ |
65f27f384 WorkStruct: Pass ... |
3334 |
struct cfq_data *cfqd = |
23e018a1b block: get rid of... |
3335 |
container_of(work, struct cfq_data, unplug_work); |
165125e1e [BLOCK] Get rid o... |
3336 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
3337 |
|
40bb54d19 cfq-iosched: no n... |
3338 |
spin_lock_irq(q->queue_lock); |
24ecfbe27 block: add blk_ru... |
3339 |
__blk_run_queue(cfqd->queue); |
40bb54d19 cfq-iosched: no n... |
3340 |
spin_unlock_irq(q->queue_lock); |
22e2c507c [PATCH] Update cf... |
3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 |
} /* * Timer running if the active_queue is currently idling inside its time slice */ static void cfq_idle_slice_timer(unsigned long data) { struct cfq_data *cfqd = (struct cfq_data *) data; struct cfq_queue *cfqq; unsigned long flags; |
3c6bd2f87 cfq-iosched: chec... |
3351 |
int timed_out = 1; |
22e2c507c [PATCH] Update cf... |
3352 |
|
7b679138b cfq-iosched: add ... |
3353 |
cfq_log(cfqd, "idle timer fired"); |
22e2c507c [PATCH] Update cf... |
3354 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
fe094d98e cfq-iosched: make... |
3355 3356 |
cfqq = cfqd->active_queue; if (cfqq) { |
3c6bd2f87 cfq-iosched: chec... |
3357 |
timed_out = 0; |
22e2c507c [PATCH] Update cf... |
3358 |
/* |
b029195dd cfq-iosched: don'... |
3359 3360 3361 3362 3363 3364 |
* We saw a request before the queue expired, let it through */ if (cfq_cfqq_must_dispatch(cfqq)) goto out_kick; /* |
22e2c507c [PATCH] Update cf... |
3365 3366 |
* expired */ |
44f7c1606 cfq-iosched: defe... |
3367 |
if (cfq_slice_used(cfqq)) |
22e2c507c [PATCH] Update cf... |
3368 3369 3370 3371 3372 3373 |
goto expire; /* * only expire and reinvoke request handler, if there are * other queues with pending requests */ |
caaa5f9f0 [PATCH] cfq-iosch... |
3374 |
if (!cfqd->busy_queues) |
22e2c507c [PATCH] Update cf... |
3375 |
goto out_cont; |
22e2c507c [PATCH] Update cf... |
3376 3377 3378 3379 |
/* * not expired and it has a request pending, let it dispatch */ |
75e50984f cfq-iosched: kill... |
3380 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
3381 |
goto out_kick; |
76280aff1 cfq-iosched: idli... |
3382 3383 3384 3385 3386 |
/* * Queue depth flag is reset only when the idle didn't succeed */ cfq_clear_cfqq_deep(cfqq); |
22e2c507c [PATCH] Update cf... |
3387 3388 |
} expire: |
e5ff082e8 blkio: Fix anothe... |
3389 |
cfq_slice_expired(cfqd, timed_out); |
22e2c507c [PATCH] Update cf... |
3390 |
out_kick: |
23e018a1b block: get rid of... |
3391 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
3392 3393 3394 |
out_cont: spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
3b18152c3 [PATCH] CFQ io sc... |
3395 3396 3397 |
static void cfq_shutdown_timer_wq(struct cfq_data *cfqd) { del_timer_sync(&cfqd->idle_slice_timer); |
23e018a1b block: get rid of... |
3398 |
cancel_work_sync(&cfqd->unplug_work); |
3b18152c3 [PATCH] CFQ io sc... |
3399 |
} |
22e2c507c [PATCH] Update cf... |
3400 |
|
c2dea2d1f cfq: async queue ... |
3401 3402 3403 3404 3405 3406 3407 3408 3409 |
static void cfq_put_async_queues(struct cfq_data *cfqd) { int i; for (i = 0; i < IOPRIO_BE_NR; i++) { if (cfqd->async_cfqq[0][i]) cfq_put_queue(cfqd->async_cfqq[0][i]); if (cfqd->async_cfqq[1][i]) cfq_put_queue(cfqd->async_cfqq[1][i]); |
c2dea2d1f cfq: async queue ... |
3410 |
} |
2389d1ef1 cfq: fix IOPRIO_C... |
3411 3412 3413 |
if (cfqd->async_idle_cfqq) cfq_put_queue(cfqd->async_idle_cfqq); |
c2dea2d1f cfq: async queue ... |
3414 |
} |
b374d18a4 block: get rid of... |
3415 |
static void cfq_exit_queue(struct elevator_queue *e) |
1da177e4c Linux-2.6.12-rc2 |
3416 |
{ |
22e2c507c [PATCH] Update cf... |
3417 |
struct cfq_data *cfqd = e->elevator_data; |
165125e1e [BLOCK] Get rid o... |
3418 |
struct request_queue *q = cfqd->queue; |
56edf7d75 cfq-iosched: Fix ... |
3419 |
bool wait = false; |
22e2c507c [PATCH] Update cf... |
3420 |
|
3b18152c3 [PATCH] CFQ io sc... |
3421 |
cfq_shutdown_timer_wq(cfqd); |
e2d74ac06 [PATCH] [BLOCK] c... |
3422 |
|
d9ff41879 [PATCH] make cfq_... |
3423 |
spin_lock_irq(q->queue_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
3424 |
|
d9ff41879 [PATCH] make cfq_... |
3425 |
if (cfqd->active_queue) |
e5ff082e8 blkio: Fix anothe... |
3426 |
__cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
e2d74ac06 [PATCH] [BLOCK] c... |
3427 |
|
c2dea2d1f cfq: async queue ... |
3428 |
cfq_put_async_queues(cfqd); |
b1c357696 blkio: Take care ... |
3429 |
cfq_release_cfq_groups(cfqd); |
56edf7d75 cfq-iosched: Fix ... |
3430 3431 3432 3433 3434 3435 3436 |
/* * If there are groups which we could not unlink from blkcg list, * wait for a rcu period for them to be freed. */ if (cfqd->nr_blkcg_linked_grps) wait = true; |
15c31be4d cfq-iosched: fix ... |
3437 |
|
d9ff41879 [PATCH] make cfq_... |
3438 |
spin_unlock_irq(q->queue_lock); |
a90d742e4 [PATCH] don't bot... |
3439 3440 |
cfq_shutdown_timer_wq(cfqd); |
56edf7d75 cfq-iosched: Fix ... |
3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 |
/* * Wait for cfqg->blkg->key accessors to exit their grace periods. * Do this wait only if there are other unlinked groups out * there. This can happen if cgroup deletion path claimed the * responsibility of cleaning up a group before queue cleanup code * get to the group. * * Do not call synchronize_rcu() unconditionally as there are drivers * which create/delete request queue hundreds of times during scan/boot * and synchronize_rcu() can take significant time and slow down boot. */ if (wait) synchronize_rcu(); |
2abae55f5 cfq-iosched: Fix ... |
3454 3455 3456 3457 3458 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED /* Free up per cpu stats for root group */ free_percpu(cfqd->root_group.blkg.stats_cpu); #endif |
56edf7d75 cfq-iosched: Fix ... |
3459 |
kfree(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
3460 |
} |
165125e1e [BLOCK] Get rid o... |
3461 |
static void *cfq_init_queue(struct request_queue *q) |
1da177e4c Linux-2.6.12-rc2 |
3462 3463 |
{ struct cfq_data *cfqd; |
718eee057 cfq-iosched: fair... |
3464 |
int i, j; |
cdb16e8f7 blkio: Introduce ... |
3465 |
struct cfq_group *cfqg; |
615f0259e blkio: Implement ... |
3466 |
struct cfq_rb_root *st; |
1da177e4c Linux-2.6.12-rc2 |
3467 |
|
94f6030ca Slab allocators: ... |
3468 |
cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node); |
a73f730d0 block, cfq: move ... |
3469 |
if (!cfqd) |
bc1c11697 [PATCH] elevator ... |
3470 |
return NULL; |
80b15c738 cfq-iosched: comp... |
3471 |
|
1fa8f6d68 blkio: Introduce ... |
3472 3473 |
/* Init root service tree */ cfqd->grp_service_tree = CFQ_RB_ROOT; |
cdb16e8f7 blkio: Introduce ... |
3474 3475 |
/* Init root group */ cfqg = &cfqd->root_group; |
615f0259e blkio: Implement ... |
3476 3477 |
for_each_cfqg_st(cfqg, i, j, st) *st = CFQ_RB_ROOT; |
1fa8f6d68 blkio: Introduce ... |
3478 |
RB_CLEAR_NODE(&cfqg->rb_node); |
26a2ac009 cfq-iosched: clea... |
3479 |
|
25bc6b077 blkio: Introduce ... |
3480 3481 |
/* Give preference to root group over other groups */ cfqg->weight = 2*BLKIO_WEIGHT_DEFAULT; |
25fb5169d blkio: Dynamic cf... |
3482 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
b1c357696 blkio: Take care ... |
3483 |
/* |
56edf7d75 cfq-iosched: Fix ... |
3484 3485 3486 3487 3488 |
* Set root group reference to 2. One reference will be dropped when * all groups on cfqd->cfqg_list are being deleted during queue exit. * Other reference will remain there as we don't want to delete this * group as it is statically allocated and gets destroyed when * throtl_data goes away. |
b1c357696 blkio: Take care ... |
3489 |
*/ |
56edf7d75 cfq-iosched: Fix ... |
3490 |
cfqg->ref = 2; |
5624a4e44 blk-throttle: Mak... |
3491 3492 3493 3494 3495 3496 |
if (blkio_alloc_blkg_stats(&cfqg->blkg)) { kfree(cfqg); kfree(cfqd); return NULL; } |
dcf097b24 blk-cgroup: Fix R... |
3497 |
rcu_read_lock(); |
5624a4e44 blk-throttle: Mak... |
3498 |
|
e98ef89b3 cfq-iosched: Fixe... |
3499 3500 |
cfq_blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, (void *)cfqd, 0); |
dcf097b24 blk-cgroup: Fix R... |
3501 |
rcu_read_unlock(); |
56edf7d75 cfq-iosched: Fix ... |
3502 3503 3504 3505 |
cfqd->nr_blkcg_linked_grps++; /* Add group on cfqd->cfqg_list */ hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); |
25fb5169d blkio: Dynamic cf... |
3506 |
#endif |
26a2ac009 cfq-iosched: clea... |
3507 3508 3509 3510 3511 3512 3513 |
/* * Not strictly needed (since RB_ROOT just clears the node and we * zeroed cfqd on alloc), but better be safe in case someone decides * to add magic to the rb code */ for (i = 0; i < CFQ_PRIO_LISTS; i++) cfqd->prio_trees[i] = RB_ROOT; |
6118b70b3 cfq-iosched: get ... |
3514 3515 3516 3517 3518 3519 |
/* * Our fallback cfqq if cfq_find_alloc_queue() runs into OOM issues. * Grab a permanent reference to it, so that the normal code flow * will not attempt to free it. */ cfq_init_cfqq(cfqd, &cfqd->oom_cfqq, 1, 0); |
30d7b9448 block cfq: don't ... |
3520 |
cfqd->oom_cfqq.ref++; |
cdb16e8f7 blkio: Introduce ... |
3521 |
cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, &cfqd->root_group); |
6118b70b3 cfq-iosched: get ... |
3522 |
|
1da177e4c Linux-2.6.12-rc2 |
3523 |
cfqd->queue = q; |
1da177e4c Linux-2.6.12-rc2 |
3524 |
|
22e2c507c [PATCH] Update cf... |
3525 3526 3527 |
init_timer(&cfqd->idle_slice_timer); cfqd->idle_slice_timer.function = cfq_idle_slice_timer; cfqd->idle_slice_timer.data = (unsigned long) cfqd; |
23e018a1b block: get rid of... |
3528 |
INIT_WORK(&cfqd->unplug_work, cfq_kick_queue); |
22e2c507c [PATCH] Update cf... |
3529 |
|
1da177e4c Linux-2.6.12-rc2 |
3530 |
cfqd->cfq_quantum = cfq_quantum; |
22e2c507c [PATCH] Update cf... |
3531 3532 |
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
1da177e4c Linux-2.6.12-rc2 |
3533 3534 |
cfqd->cfq_back_max = cfq_back_max; cfqd->cfq_back_penalty = cfq_back_penalty; |
22e2c507c [PATCH] Update cf... |
3535 3536 3537 3538 |
cfqd->cfq_slice[0] = cfq_slice_async; cfqd->cfq_slice[1] = cfq_slice_sync; cfqd->cfq_slice_async_rq = cfq_slice_async_rq; cfqd->cfq_slice_idle = cfq_slice_idle; |
80bdf0c78 cfq-iosched: Impl... |
3539 |
cfqd->cfq_group_idle = cfq_group_idle; |
963b72fc6 cfq-iosched: rena... |
3540 |
cfqd->cfq_latency = 1; |
e459dd08f cfq-iosched: fix ... |
3541 |
cfqd->hw_tag = -1; |
edc71131c cfq-iosched: comm... |
3542 3543 3544 3545 |
/* * we optimistically start assuming sync ops weren't delayed in last * second, in order to have larger depth for async operations. */ |
573412b29 cfq-iosched: redu... |
3546 |
cfqd->last_delayed_sync = jiffies - HZ; |
bc1c11697 [PATCH] elevator ... |
3547 |
return cfqd; |
1da177e4c Linux-2.6.12-rc2 |
3548 |
} |
1da177e4c Linux-2.6.12-rc2 |
3549 3550 3551 |
/* * sysfs parts below --> */ |
1da177e4c Linux-2.6.12-rc2 |
3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 |
static ssize_t cfq_var_show(unsigned int var, char *page) { return sprintf(page, "%d ", var); } static ssize_t cfq_var_store(unsigned int *var, const char *page, size_t count) { char *p = (char *) page; *var = simple_strtoul(p, &p, 10); return count; } |
1da177e4c Linux-2.6.12-rc2 |
3567 |
#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
b374d18a4 block: get rid of... |
3568 |
static ssize_t __FUNC(struct elevator_queue *e, char *page) \ |
1da177e4c Linux-2.6.12-rc2 |
3569 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
3570 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
3571 3572 3573 3574 3575 3576 |
unsigned int __data = __VAR; \ if (__CONV) \ __data = jiffies_to_msecs(__data); \ return cfq_var_show(__data, (page)); \ } SHOW_FUNCTION(cfq_quantum_show, cfqd->cfq_quantum, 0); |
22e2c507c [PATCH] Update cf... |
3577 3578 |
SHOW_FUNCTION(cfq_fifo_expire_sync_show, cfqd->cfq_fifo_expire[1], 1); SHOW_FUNCTION(cfq_fifo_expire_async_show, cfqd->cfq_fifo_expire[0], 1); |
e572ec7e4 [PATCH] fix rmmod... |
3579 3580 |
SHOW_FUNCTION(cfq_back_seek_max_show, cfqd->cfq_back_max, 0); SHOW_FUNCTION(cfq_back_seek_penalty_show, cfqd->cfq_back_penalty, 0); |
22e2c507c [PATCH] Update cf... |
3581 |
SHOW_FUNCTION(cfq_slice_idle_show, cfqd->cfq_slice_idle, 1); |
80bdf0c78 cfq-iosched: Impl... |
3582 |
SHOW_FUNCTION(cfq_group_idle_show, cfqd->cfq_group_idle, 1); |
22e2c507c [PATCH] Update cf... |
3583 3584 3585 |
SHOW_FUNCTION(cfq_slice_sync_show, cfqd->cfq_slice[1], 1); SHOW_FUNCTION(cfq_slice_async_show, cfqd->cfq_slice[0], 1); SHOW_FUNCTION(cfq_slice_async_rq_show, cfqd->cfq_slice_async_rq, 0); |
963b72fc6 cfq-iosched: rena... |
3586 |
SHOW_FUNCTION(cfq_low_latency_show, cfqd->cfq_latency, 0); |
1da177e4c Linux-2.6.12-rc2 |
3587 3588 3589 |
#undef SHOW_FUNCTION #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
b374d18a4 block: get rid of... |
3590 |
static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ |
1da177e4c Linux-2.6.12-rc2 |
3591 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
3592 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 |
unsigned int __data; \ int ret = cfq_var_store(&__data, (page), count); \ if (__data < (MIN)) \ __data = (MIN); \ else if (__data > (MAX)) \ __data = (MAX); \ if (__CONV) \ *(__PTR) = msecs_to_jiffies(__data); \ else \ *(__PTR) = __data; \ return ret; \ } STORE_FUNCTION(cfq_quantum_store, &cfqd->cfq_quantum, 1, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
3606 3607 3608 3609 |
STORE_FUNCTION(cfq_fifo_expire_sync_store, &cfqd->cfq_fifo_expire[1], 1, UINT_MAX, 1); STORE_FUNCTION(cfq_fifo_expire_async_store, &cfqd->cfq_fifo_expire[0], 1, UINT_MAX, 1); |
e572ec7e4 [PATCH] fix rmmod... |
3610 |
STORE_FUNCTION(cfq_back_seek_max_store, &cfqd->cfq_back_max, 0, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
3611 3612 |
STORE_FUNCTION(cfq_back_seek_penalty_store, &cfqd->cfq_back_penalty, 1, UINT_MAX, 0); |
22e2c507c [PATCH] Update cf... |
3613 |
STORE_FUNCTION(cfq_slice_idle_store, &cfqd->cfq_slice_idle, 0, UINT_MAX, 1); |
80bdf0c78 cfq-iosched: Impl... |
3614 |
STORE_FUNCTION(cfq_group_idle_store, &cfqd->cfq_group_idle, 0, UINT_MAX, 1); |
22e2c507c [PATCH] Update cf... |
3615 3616 |
STORE_FUNCTION(cfq_slice_sync_store, &cfqd->cfq_slice[1], 1, UINT_MAX, 1); STORE_FUNCTION(cfq_slice_async_store, &cfqd->cfq_slice[0], 1, UINT_MAX, 1); |
fe094d98e cfq-iosched: make... |
3617 3618 |
STORE_FUNCTION(cfq_slice_async_rq_store, &cfqd->cfq_slice_async_rq, 1, UINT_MAX, 0); |
963b72fc6 cfq-iosched: rena... |
3619 |
STORE_FUNCTION(cfq_low_latency_store, &cfqd->cfq_latency, 0, 1, 0); |
1da177e4c Linux-2.6.12-rc2 |
3620 |
#undef STORE_FUNCTION |
e572ec7e4 [PATCH] fix rmmod... |
3621 3622 3623 3624 3625 |
#define CFQ_ATTR(name) \ __ATTR(name, S_IRUGO|S_IWUSR, cfq_##name##_show, cfq_##name##_store) static struct elv_fs_entry cfq_attrs[] = { CFQ_ATTR(quantum), |
e572ec7e4 [PATCH] fix rmmod... |
3626 3627 3628 3629 3630 3631 3632 3633 |
CFQ_ATTR(fifo_expire_sync), CFQ_ATTR(fifo_expire_async), CFQ_ATTR(back_seek_max), CFQ_ATTR(back_seek_penalty), CFQ_ATTR(slice_sync), CFQ_ATTR(slice_async), CFQ_ATTR(slice_async_rq), CFQ_ATTR(slice_idle), |
80bdf0c78 cfq-iosched: Impl... |
3634 |
CFQ_ATTR(group_idle), |
963b72fc6 cfq-iosched: rena... |
3635 |
CFQ_ATTR(low_latency), |
e572ec7e4 [PATCH] fix rmmod... |
3636 |
__ATTR_NULL |
1da177e4c Linux-2.6.12-rc2 |
3637 |
}; |
1da177e4c Linux-2.6.12-rc2 |
3638 3639 3640 3641 3642 |
static struct elevator_type iosched_cfq = { .ops = { .elevator_merge_fn = cfq_merge, .elevator_merged_fn = cfq_merged_request, .elevator_merge_req_fn = cfq_merged_requests, |
da7752650 [PATCH] cfq-iosch... |
3643 |
.elevator_allow_merge_fn = cfq_allow_merge, |
812d40264 blkio: Add io_mer... |
3644 |
.elevator_bio_merged_fn = cfq_bio_merged, |
b4878f245 [PATCH] 02/05: up... |
3645 |
.elevator_dispatch_fn = cfq_dispatch_requests, |
1da177e4c Linux-2.6.12-rc2 |
3646 |
.elevator_add_req_fn = cfq_insert_request, |
b4878f245 [PATCH] 02/05: up... |
3647 |
.elevator_activate_req_fn = cfq_activate_request, |
1da177e4c Linux-2.6.12-rc2 |
3648 |
.elevator_deactivate_req_fn = cfq_deactivate_request, |
1da177e4c Linux-2.6.12-rc2 |
3649 |
.elevator_completed_req_fn = cfq_completed_request, |
21183b07e [PATCH] cfq-iosch... |
3650 3651 |
.elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, |
9b84cacd0 block, cfq: restr... |
3652 |
.elevator_init_icq_fn = cfq_init_icq, |
7e5a87944 block, cfq: move ... |
3653 |
.elevator_exit_icq_fn = cfq_exit_icq, |
1da177e4c Linux-2.6.12-rc2 |
3654 3655 3656 3657 3658 3659 |
.elevator_set_req_fn = cfq_set_request, .elevator_put_req_fn = cfq_put_request, .elevator_may_queue_fn = cfq_may_queue, .elevator_init_fn = cfq_init_queue, .elevator_exit_fn = cfq_exit_queue, }, |
3d3c2379f block, cfq: move ... |
3660 3661 |
.icq_size = sizeof(struct cfq_io_cq), .icq_align = __alignof__(struct cfq_io_cq), |
3d1ab40f4 [PATCH] elevator_... |
3662 |
.elevator_attrs = cfq_attrs, |
3d3c2379f block, cfq: move ... |
3663 |
.elevator_name = "cfq", |
1da177e4c Linux-2.6.12-rc2 |
3664 3665 |
.elevator_owner = THIS_MODULE, }; |
3e2520668 blkio: Implement ... |
3666 3667 3668 3669 3670 3671 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED static struct blkio_policy_type blkio_policy_cfq = { .ops = { .blkio_unlink_group_fn = cfq_unlink_blkio_group, .blkio_update_group_weight_fn = cfq_update_blkio_group_weight, }, |
062a644d6 blk-cgroup: Prepa... |
3672 |
.plid = BLKIO_POLICY_PROP, |
3e2520668 blkio: Implement ... |
3673 3674 3675 3676 |
}; #else static struct blkio_policy_type blkio_policy_cfq; #endif |
1da177e4c Linux-2.6.12-rc2 |
3677 3678 |
static int __init cfq_init(void) { |
3d3c2379f block, cfq: move ... |
3679 |
int ret; |
22e2c507c [PATCH] Update cf... |
3680 3681 3682 3683 3684 3685 3686 |
/* * could be 0 on HZ < 1000 setups */ if (!cfq_slice_async) cfq_slice_async = 1; if (!cfq_slice_idle) cfq_slice_idle = 1; |
80bdf0c78 cfq-iosched: Impl... |
3687 3688 3689 3690 3691 3692 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED if (!cfq_group_idle) cfq_group_idle = 1; #else cfq_group_idle = 0; #endif |
3d3c2379f block, cfq: move ... |
3693 3694 |
cfq_pool = KMEM_CACHE(cfq_queue, 0); if (!cfq_pool) |
1da177e4c Linux-2.6.12-rc2 |
3695 |
return -ENOMEM; |
3d3c2379f block, cfq: move ... |
3696 3697 3698 3699 3700 |
ret = elv_register(&iosched_cfq); if (ret) { kmem_cache_destroy(cfq_pool); return ret; } |
3d3c2379f block, cfq: move ... |
3701 |
|
3e2520668 blkio: Implement ... |
3702 |
blkio_policy_register(&blkio_policy_cfq); |
1da177e4c Linux-2.6.12-rc2 |
3703 |
|
2fdd82bd8 block: let elv_re... |
3704 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3705 3706 3707 3708 |
} static void __exit cfq_exit(void) { |
3e2520668 blkio: Implement ... |
3709 |
blkio_policy_unregister(&blkio_policy_cfq); |
1da177e4c Linux-2.6.12-rc2 |
3710 |
elv_unregister(&iosched_cfq); |
3d3c2379f block, cfq: move ... |
3711 |
kmem_cache_destroy(cfq_pool); |
1da177e4c Linux-2.6.12-rc2 |
3712 3713 3714 3715 3716 3717 3718 3719 |
} module_init(cfq_init); module_exit(cfq_exit); MODULE_AUTHOR("Jens Axboe"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |