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mm/rmap.c
48.6 KB
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/* * mm/rmap.c - physical to virtual reverse mappings * * Copyright 2001, Rik van Riel <riel@conectiva.com.br> * Released under the General Public License (GPL). * * Simple, low overhead reverse mapping scheme. * Please try to keep this thing as modular as possible. * * Provides methods for unmapping each kind of mapped page: * the anon methods track anonymous pages, and * the file methods track pages belonging to an inode. * * Original design by Rik van Riel <riel@conectiva.com.br> 2001 * File methods by Dave McCracken <dmccr@us.ibm.com> 2003, 2004 * Anonymous methods by Andrea Arcangeli <andrea@suse.de> 2004 |
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* Contributions by Hugh Dickins 2003, 2004 |
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*/ /* * Lock ordering in mm: * |
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* inode->i_mutex (while writing or truncating, not reading or faulting) |
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* mm->mmap_sem * page->flags PG_locked (lock_page) |
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* mapping->i_mmap_mutex |
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* anon_vma->rwsem |
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* mm->page_table_lock or pte_lock * zone->lru_lock (in mark_page_accessed, isolate_lru_page) * swap_lock (in swap_duplicate, swap_info_get) * mmlist_lock (in mmput, drain_mmlist and others) * mapping->private_lock (in __set_page_dirty_buffers) |
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* inode->i_lock (in set_page_dirty's __mark_inode_dirty) |
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* bdi.wb->list_lock (in set_page_dirty's __mark_inode_dirty) |
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* sb_lock (within inode_lock in fs/fs-writeback.c) * mapping->tree_lock (widely used, in set_page_dirty, * in arch-dependent flush_dcache_mmap_lock, |
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* within bdi.wb->list_lock in __sync_single_inode) |
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* |
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* anon_vma->rwsem,mapping->i_mutex (memory_failure, collect_procs_anon) |
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* ->tasklist_lock |
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* pte map lock |
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*/ #include <linux/mm.h> #include <linux/pagemap.h> #include <linux/swap.h> #include <linux/swapops.h> #include <linux/slab.h> #include <linux/init.h> |
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#include <linux/ksm.h> |
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#include <linux/rmap.h> #include <linux/rcupdate.h> |
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#include <linux/export.h> |
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#include <linux/memcontrol.h> |
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#include <linux/mmu_notifier.h> |
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#include <linux/migrate.h> |
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#include <linux/hugetlb.h> |
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#include <linux/backing-dev.h> |
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#include <asm/tlbflush.h> |
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#include "internal.h" |
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static struct kmem_cache *anon_vma_cachep; |
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static struct kmem_cache *anon_vma_chain_cachep; |
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static inline struct anon_vma *anon_vma_alloc(void) { |
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struct anon_vma *anon_vma; anon_vma = kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL); if (anon_vma) { atomic_set(&anon_vma->refcount, 1); /* * Initialise the anon_vma root to point to itself. If called * from fork, the root will be reset to the parents anon_vma. */ anon_vma->root = anon_vma; } return anon_vma; |
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} |
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static inline void anon_vma_free(struct anon_vma *anon_vma) |
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{ |
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VM_BUG_ON(atomic_read(&anon_vma->refcount)); |
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/* |
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* Synchronize against page_lock_anon_vma_read() such that |
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* we can safely hold the lock without the anon_vma getting * freed. * * Relies on the full mb implied by the atomic_dec_and_test() from * put_anon_vma() against the acquire barrier implied by |
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* down_read_trylock() from page_lock_anon_vma_read(). This orders: |
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* |
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* page_lock_anon_vma_read() VS put_anon_vma() * down_read_trylock() atomic_dec_and_test() |
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* LOCK MB |
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* atomic_read() rwsem_is_locked() |
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* * LOCK should suffice since the actual taking of the lock must * happen _before_ what follows. */ |
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might_sleep(); |
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if (rwsem_is_locked(&anon_vma->root->rwsem)) { |
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anon_vma_lock_write(anon_vma); |
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anon_vma_unlock_write(anon_vma); |
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} |
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kmem_cache_free(anon_vma_cachep, anon_vma); } |
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|
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static inline struct anon_vma_chain *anon_vma_chain_alloc(gfp_t gfp) |
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{ |
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return kmem_cache_alloc(anon_vma_chain_cachep, gfp); |
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} |
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static void anon_vma_chain_free(struct anon_vma_chain *anon_vma_chain) |
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{ kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain); } |
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static void anon_vma_chain_link(struct vm_area_struct *vma, struct anon_vma_chain *avc, struct anon_vma *anon_vma) { avc->vma = vma; avc->anon_vma = anon_vma; list_add(&avc->same_vma, &vma->anon_vma_chain); |
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anon_vma_interval_tree_insert(avc, &anon_vma->rb_root); |
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} |
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/** * anon_vma_prepare - attach an anon_vma to a memory region * @vma: the memory region in question * * This makes sure the memory mapping described by 'vma' has * an 'anon_vma' attached to it, so that we can associate the * anonymous pages mapped into it with that anon_vma. * * The common case will be that we already have one, but if |
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* not we either need to find an adjacent mapping that we |
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* can re-use the anon_vma from (very common when the only * reason for splitting a vma has been mprotect()), or we * allocate a new one. * * Anon-vma allocations are very subtle, because we may have |
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* optimistically looked up an anon_vma in page_lock_anon_vma_read() |
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* and that may actually touch the spinlock even in the newly * allocated vma (it depends on RCU to make sure that the * anon_vma isn't actually destroyed). * * As a result, we need to do proper anon_vma locking even * for the new allocation. At the same time, we do not want * to do any locking for the common case of already having * an anon_vma. * * This must be called with the mmap_sem held for reading. */ |
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int anon_vma_prepare(struct vm_area_struct *vma) { struct anon_vma *anon_vma = vma->anon_vma; |
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struct anon_vma_chain *avc; |
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might_sleep(); if (unlikely(!anon_vma)) { struct mm_struct *mm = vma->vm_mm; |
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struct anon_vma *allocated; |
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|
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avc = anon_vma_chain_alloc(GFP_KERNEL); |
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if (!avc) goto out_enomem; |
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anon_vma = find_mergeable_anon_vma(vma); |
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allocated = NULL; if (!anon_vma) { |
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anon_vma = anon_vma_alloc(); if (unlikely(!anon_vma)) |
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goto out_enomem_free_avc; |
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allocated = anon_vma; |
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} |
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anon_vma_lock_write(anon_vma); |
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/* page_table_lock to protect against threads */ spin_lock(&mm->page_table_lock); if (likely(!vma->anon_vma)) { vma->anon_vma = anon_vma; |
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anon_vma_chain_link(vma, avc, anon_vma); |
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allocated = NULL; |
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avc = NULL; |
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} spin_unlock(&mm->page_table_lock); |
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anon_vma_unlock_write(anon_vma); |
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if (unlikely(allocated)) |
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put_anon_vma(allocated); |
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if (unlikely(avc)) |
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anon_vma_chain_free(avc); |
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} return 0; |
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out_enomem_free_avc: anon_vma_chain_free(avc); out_enomem: return -ENOMEM; |
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} |
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/* * This is a useful helper function for locking the anon_vma root as * we traverse the vma->anon_vma_chain, looping over anon_vma's that * have the same vma. * * Such anon_vma's should have the same root, so you'd expect to see * just a single mutex_lock for the whole traversal. */ static inline struct anon_vma *lock_anon_vma_root(struct anon_vma *root, struct anon_vma *anon_vma) { struct anon_vma *new_root = anon_vma->root; if (new_root != root) { if (WARN_ON_ONCE(root)) |
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up_write(&root->rwsem); |
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root = new_root; |
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down_write(&root->rwsem); |
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} return root; } static inline void unlock_anon_vma_root(struct anon_vma *root) { if (root) |
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up_write(&root->rwsem); |
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} |
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/* * Attach the anon_vmas from src to dst. * Returns 0 on success, -ENOMEM on failure. */ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src) |
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{ |
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struct anon_vma_chain *avc, *pavc; |
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struct anon_vma *root = NULL; |
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|
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list_for_each_entry_reverse(pavc, &src->anon_vma_chain, same_vma) { |
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struct anon_vma *anon_vma; |
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avc = anon_vma_chain_alloc(GFP_NOWAIT | __GFP_NOWARN); if (unlikely(!avc)) { unlock_anon_vma_root(root); root = NULL; avc = anon_vma_chain_alloc(GFP_KERNEL); if (!avc) goto enomem_failure; } |
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anon_vma = pavc->anon_vma; root = lock_anon_vma_root(root, anon_vma); anon_vma_chain_link(dst, avc, anon_vma); |
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} |
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unlock_anon_vma_root(root); |
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return 0; |
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|
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enomem_failure: unlink_anon_vmas(dst); return -ENOMEM; |
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} |
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/* * Attach vma to its own anon_vma, as well as to the anon_vmas that * the corresponding VMA in the parent process is attached to. * Returns 0 on success, non-zero on failure. */ int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma) |
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{ |
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struct anon_vma_chain *avc; struct anon_vma *anon_vma; |
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int error; |
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|
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/* Don't bother if the parent process has no anon_vma here. */ if (!pvma->anon_vma) return 0; /* * First, attach the new VMA to the parent VMA's anon_vmas, * so rmap can find non-COWed pages in child processes. */ |
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error = anon_vma_clone(vma, pvma); if (error) return error; |
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/* Then add our own anon_vma. */ anon_vma = anon_vma_alloc(); if (!anon_vma) goto out_error; |
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avc = anon_vma_chain_alloc(GFP_KERNEL); |
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if (!avc) goto out_error_free_anon_vma; |
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/* * The root anon_vma's spinlock is the lock actually used when we * lock any of the anon_vmas in this anon_vma tree. */ anon_vma->root = pvma->anon_vma->root; |
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/* |
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* With refcounts, an anon_vma can stay around longer than the * process it belongs to. The root anon_vma needs to be pinned until * this anon_vma is freed, because the lock lives in the root. |
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*/ get_anon_vma(anon_vma->root); |
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/* Mark this anon_vma as the one where our new (COWed) pages go. */ vma->anon_vma = anon_vma; |
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anon_vma_lock_write(anon_vma); |
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anon_vma_chain_link(vma, avc, anon_vma); |
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anon_vma_unlock_write(anon_vma); |
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return 0; out_error_free_anon_vma: |
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put_anon_vma(anon_vma); |
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out_error: |
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unlink_anon_vmas(vma); |
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return -ENOMEM; |
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} |
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void unlink_anon_vmas(struct vm_area_struct *vma) { struct anon_vma_chain *avc, *next; |
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struct anon_vma *root = NULL; |
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|
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/* * Unlink each anon_vma chained to the VMA. This list is ordered * from newest to oldest, ensuring the root anon_vma gets freed last. */ |
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list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) { |
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struct anon_vma *anon_vma = avc->anon_vma; root = lock_anon_vma_root(root, anon_vma); |
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anon_vma_interval_tree_remove(avc, &anon_vma->rb_root); |
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/* * Leave empty anon_vmas on the list - we'll need * to free them outside the lock. */ |
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if (RB_EMPTY_ROOT(&anon_vma->rb_root)) |
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continue; list_del(&avc->same_vma); anon_vma_chain_free(avc); } unlock_anon_vma_root(root); /* * Iterate the list once more, it now only contains empty and unlinked * anon_vmas, destroy them. Could not do before due to __put_anon_vma() |
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* needing to write-acquire the anon_vma->root->rwsem. |
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*/ list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) { struct anon_vma *anon_vma = avc->anon_vma; put_anon_vma(anon_vma); |
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list_del(&avc->same_vma); anon_vma_chain_free(avc); } } |
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static void anon_vma_ctor(void *data) |
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{ |
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struct anon_vma *anon_vma = data; |
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|
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init_rwsem(&anon_vma->rwsem); |
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atomic_set(&anon_vma->refcount, 0); |
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anon_vma->rb_root = RB_ROOT; |
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} void __init anon_vma_init(void) { anon_vma_cachep = kmem_cache_create("anon_vma", sizeof(struct anon_vma), |
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0, SLAB_DESTROY_BY_RCU|SLAB_PANIC, anon_vma_ctor); |
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anon_vma_chain_cachep = KMEM_CACHE(anon_vma_chain, SLAB_PANIC); |
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} /* |
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* Getting a lock on a stable anon_vma from a page off the LRU is tricky! * * Since there is no serialization what so ever against page_remove_rmap() * the best this function can do is return a locked anon_vma that might * have been relevant to this page. * * The page might have been remapped to a different anon_vma or the anon_vma * returned may already be freed (and even reused). * |
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* In case it was remapped to a different anon_vma, the new anon_vma will be a * child of the old anon_vma, and the anon_vma lifetime rules will therefore * ensure that any anon_vma obtained from the page will still be valid for as * long as we observe page_mapped() [ hence all those page_mapped() tests ]. * |
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* All users of this function must be very careful when walking the anon_vma * chain and verify that the page in question is indeed mapped in it * [ something equivalent to page_mapped_in_vma() ]. * * Since anon_vma's slab is DESTROY_BY_RCU and we know from page_remove_rmap() * that the anon_vma pointer from page->mapping is valid if there is a * mapcount, we can dereference the anon_vma after observing those. |
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*/ |
746b18d42 mm: use refcounts... |
390 |
struct anon_vma *page_get_anon_vma(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
391 |
{ |
746b18d42 mm: use refcounts... |
392 |
struct anon_vma *anon_vma = NULL; |
1da177e4c Linux-2.6.12-rc2 |
393 394 395 |
unsigned long anon_mapping; rcu_read_lock(); |
80e148226 ksm: share anon p... |
396 |
anon_mapping = (unsigned long) ACCESS_ONCE(page->mapping); |
3ca7b3c5b mm: define PAGE_M... |
397 |
if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON) |
1da177e4c Linux-2.6.12-rc2 |
398 399 400 401 402 |
goto out; if (!page_mapped(page)) goto out; anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON); |
746b18d42 mm: use refcounts... |
403 404 405 406 |
if (!atomic_inc_not_zero(&anon_vma->refcount)) { anon_vma = NULL; goto out; } |
f18194275 mm: fix hang on a... |
407 408 409 |
/* * If this page is still mapped, then its anon_vma cannot have been |
746b18d42 mm: use refcounts... |
410 411 412 413 |
* freed. But if it has been unmapped, we have no security against the * anon_vma structure being freed and reused (for another anon_vma: * SLAB_DESTROY_BY_RCU guarantees that - so the atomic_inc_not_zero() * above cannot corrupt). |
f18194275 mm: fix hang on a... |
414 |
*/ |
746b18d42 mm: use refcounts... |
415 |
if (!page_mapped(page)) { |
7f39dda9d mm: fix sleeping ... |
416 |
rcu_read_unlock(); |
746b18d42 mm: use refcounts... |
417 |
put_anon_vma(anon_vma); |
7f39dda9d mm: fix sleeping ... |
418 |
return NULL; |
746b18d42 mm: use refcounts... |
419 |
} |
1da177e4c Linux-2.6.12-rc2 |
420 421 |
out: rcu_read_unlock(); |
746b18d42 mm: use refcounts... |
422 423 424 |
return anon_vma; } |
88c22088b mm: optimize page... |
425 426 427 428 429 430 431 |
/* * Similar to page_get_anon_vma() except it locks the anon_vma. * * Its a little more complex as it tries to keep the fast path to a single * atomic op -- the trylock. If we fail the trylock, we fall back to getting a * reference like with page_get_anon_vma() and then block on the mutex. */ |
4fc3f1d66 mm/rmap, migratio... |
432 |
struct anon_vma *page_lock_anon_vma_read(struct page *page) |
746b18d42 mm: use refcounts... |
433 |
{ |
88c22088b mm: optimize page... |
434 |
struct anon_vma *anon_vma = NULL; |
eee0f252c mm: fix page_lock... |
435 |
struct anon_vma *root_anon_vma; |
88c22088b mm: optimize page... |
436 |
unsigned long anon_mapping; |
746b18d42 mm: use refcounts... |
437 |
|
88c22088b mm: optimize page... |
438 439 440 441 442 443 444 445 |
rcu_read_lock(); anon_mapping = (unsigned long) ACCESS_ONCE(page->mapping); if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON) goto out; if (!page_mapped(page)) goto out; anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON); |
eee0f252c mm: fix page_lock... |
446 |
root_anon_vma = ACCESS_ONCE(anon_vma->root); |
4fc3f1d66 mm/rmap, migratio... |
447 |
if (down_read_trylock(&root_anon_vma->rwsem)) { |
88c22088b mm: optimize page... |
448 |
/* |
eee0f252c mm: fix page_lock... |
449 450 |
* If the page is still mapped, then this anon_vma is still * its anon_vma, and holding the mutex ensures that it will |
bc658c960 mm, rmap: Add yet... |
451 |
* not go away, see anon_vma_free(). |
88c22088b mm: optimize page... |
452 |
*/ |
eee0f252c mm: fix page_lock... |
453 |
if (!page_mapped(page)) { |
4fc3f1d66 mm/rmap, migratio... |
454 |
up_read(&root_anon_vma->rwsem); |
88c22088b mm: optimize page... |
455 456 457 458 |
anon_vma = NULL; } goto out; } |
746b18d42 mm: use refcounts... |
459 |
|
88c22088b mm: optimize page... |
460 461 462 463 464 465 466 |
/* trylock failed, we got to sleep */ if (!atomic_inc_not_zero(&anon_vma->refcount)) { anon_vma = NULL; goto out; } if (!page_mapped(page)) { |
7f39dda9d mm: fix sleeping ... |
467 |
rcu_read_unlock(); |
88c22088b mm: optimize page... |
468 |
put_anon_vma(anon_vma); |
7f39dda9d mm: fix sleeping ... |
469 |
return NULL; |
88c22088b mm: optimize page... |
470 471 472 473 |
} /* we pinned the anon_vma, its safe to sleep */ rcu_read_unlock(); |
4fc3f1d66 mm/rmap, migratio... |
474 |
anon_vma_lock_read(anon_vma); |
88c22088b mm: optimize page... |
475 476 477 478 479 |
if (atomic_dec_and_test(&anon_vma->refcount)) { /* * Oops, we held the last refcount, release the lock * and bail -- can't simply use put_anon_vma() because |
4fc3f1d66 mm/rmap, migratio... |
480 |
* we'll deadlock on the anon_vma_lock_write() recursion. |
88c22088b mm: optimize page... |
481 |
*/ |
4fc3f1d66 mm/rmap, migratio... |
482 |
anon_vma_unlock_read(anon_vma); |
88c22088b mm: optimize page... |
483 484 485 486 487 488 489 490 |
__put_anon_vma(anon_vma); anon_vma = NULL; } return anon_vma; out: rcu_read_unlock(); |
746b18d42 mm: use refcounts... |
491 |
return anon_vma; |
34bbd7040 [PATCH] adapt pag... |
492 |
} |
4fc3f1d66 mm/rmap, migratio... |
493 |
void page_unlock_anon_vma_read(struct anon_vma *anon_vma) |
34bbd7040 [PATCH] adapt pag... |
494 |
{ |
4fc3f1d66 mm/rmap, migratio... |
495 |
anon_vma_unlock_read(anon_vma); |
1da177e4c Linux-2.6.12-rc2 |
496 497 498 |
} /* |
3ad33b243 Migration: find c... |
499 |
* At what user virtual address is page expected in @vma? |
1da177e4c Linux-2.6.12-rc2 |
500 |
*/ |
86c2ad199 mm rmap: remove v... |
501 502 |
static inline unsigned long __vma_address(struct page *page, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
503 |
{ |
a0f7a756c mm/rmap.c: fix pg... |
504 |
pgoff_t pgoff = page_to_pgoff(page); |
86c2ad199 mm rmap: remove v... |
505 506 507 508 509 510 511 512 513 |
return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); } inline unsigned long vma_address(struct page *page, struct vm_area_struct *vma) { unsigned long address = __vma_address(page, vma); /* page should be within @vma mapping range */ |
81d1b09c6 mm: convert a few... |
514 |
VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); |
86c2ad199 mm rmap: remove v... |
515 |
|
1da177e4c Linux-2.6.12-rc2 |
516 517 518 519 |
return address; } /* |
bf89c8c86 mm/rmap.c: fix co... |
520 |
* At what user virtual address is page expected in vma? |
ab941e0ff rmap: remove anon... |
521 |
* Caller should check the page is actually part of the vma. |
1da177e4c Linux-2.6.12-rc2 |
522 523 524 |
*/ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma) { |
86c2ad199 mm rmap: remove v... |
525 |
unsigned long address; |
21d0d443c rmap: resurrect p... |
526 |
if (PageAnon(page)) { |
4829b906c ksm: fix page_add... |
527 528 529 530 531 532 533 |
struct anon_vma *page__anon_vma = page_anon_vma(page); /* * Note: swapoff's unuse_vma() is more efficient with this * check, and needs it to match anon_vma when KSM is active. */ if (!vma->anon_vma || !page__anon_vma || vma->anon_vma->root != page__anon_vma->root) |
21d0d443c rmap: resurrect p... |
534 535 |
return -EFAULT; } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) { |
ee498ed73 [PATCH] unpaged: ... |
536 537 |
if (!vma->vm_file || vma->vm_file->f_mapping != page->mapping) |
1da177e4c Linux-2.6.12-rc2 |
538 539 540 |
return -EFAULT; } else return -EFAULT; |
86c2ad199 mm rmap: remove v... |
541 542 543 544 |
address = __vma_address(page, vma); if (unlikely(address < vma->vm_start || address >= vma->vm_end)) return -EFAULT; return address; |
1da177e4c Linux-2.6.12-rc2 |
545 |
} |
6219049ae mm: introduce mm_... |
546 547 548 549 550 |
pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address) { pgd_t *pgd; pud_t *pud; pmd_t *pmd = NULL; |
f72e7dcdd mm: let mm_find_p... |
551 |
pmd_t pmde; |
6219049ae mm: introduce mm_... |
552 553 554 555 556 557 558 559 560 561 |
pgd = pgd_offset(mm, address); if (!pgd_present(*pgd)) goto out; pud = pud_offset(pgd, address); if (!pud_present(*pud)) goto out; pmd = pmd_offset(pud, address); |
f72e7dcdd mm: let mm_find_p... |
562 563 564 565 566 567 568 |
/* * Some THP functions use the sequence pmdp_clear_flush(), set_pmd_at() * without holding anon_vma lock for write. So when looking for a * genuine pmde (in which to find pte), test present and !THP together. */ pmde = ACCESS_ONCE(*pmd); if (!pmd_present(pmde) || pmd_trans_huge(pmde)) |
6219049ae mm: introduce mm_... |
569 570 571 572 |
pmd = NULL; out: return pmd; } |
1da177e4c Linux-2.6.12-rc2 |
573 |
/* |
81b4082dc [PATCH] mm: rmap.... |
574 575 |
* Check that @page is mapped at @address into @mm. * |
479db0bf4 mm: dirty page tr... |
576 577 578 579 |
* If @sync is false, page_check_address may perform a racy check to avoid * the page table lock when the pte is not present (helpful when reclaiming * highly shared pages). * |
b8072f099 [PATCH] mm: updat... |
580 |
* On success returns with pte mapped and locked. |
81b4082dc [PATCH] mm: rmap.... |
581 |
*/ |
e9a81a821 rmap: wrap page_c... |
582 |
pte_t *__page_check_address(struct page *page, struct mm_struct *mm, |
479db0bf4 mm: dirty page tr... |
583 |
unsigned long address, spinlock_t **ptlp, int sync) |
81b4082dc [PATCH] mm: rmap.... |
584 |
{ |
81b4082dc [PATCH] mm: rmap.... |
585 586 |
pmd_t *pmd; pte_t *pte; |
c0718806c [PATCH] mm: rmap ... |
587 |
spinlock_t *ptl; |
81b4082dc [PATCH] mm: rmap.... |
588 |
|
0fe6e20b9 hugetlb, rmap: ad... |
589 |
if (unlikely(PageHuge(page))) { |
98398c32f mm/hugetlb: check... |
590 |
/* when pud is not present, pte will be NULL */ |
0fe6e20b9 hugetlb, rmap: ad... |
591 |
pte = huge_pte_offset(mm, address); |
98398c32f mm/hugetlb: check... |
592 593 |
if (!pte) return NULL; |
cb900f412 mm, hugetlb: conv... |
594 |
ptl = huge_pte_lockptr(page_hstate(page), mm, pte); |
0fe6e20b9 hugetlb, rmap: ad... |
595 596 |
goto check; } |
6219049ae mm: introduce mm_... |
597 598 |
pmd = mm_find_pmd(mm, address); if (!pmd) |
c0718806c [PATCH] mm: rmap ... |
599 |
return NULL; |
c0718806c [PATCH] mm: rmap ... |
600 601 |
pte = pte_offset_map(pmd, address); /* Make a quick check before getting the lock */ |
479db0bf4 mm: dirty page tr... |
602 |
if (!sync && !pte_present(*pte)) { |
c0718806c [PATCH] mm: rmap ... |
603 604 605 |
pte_unmap(pte); return NULL; } |
4c21e2f24 [PATCH] mm: split... |
606 |
ptl = pte_lockptr(mm, pmd); |
0fe6e20b9 hugetlb, rmap: ad... |
607 |
check: |
c0718806c [PATCH] mm: rmap ... |
608 609 610 611 |
spin_lock(ptl); if (pte_present(*pte) && page_to_pfn(page) == pte_pfn(*pte)) { *ptlp = ptl; return pte; |
81b4082dc [PATCH] mm: rmap.... |
612 |
} |
c0718806c [PATCH] mm: rmap ... |
613 614 |
pte_unmap_unlock(pte, ptl); return NULL; |
81b4082dc [PATCH] mm: rmap.... |
615 |
} |
b291f0003 mlock: mlocked pa... |
616 617 618 619 620 621 622 623 624 |
/** * page_mapped_in_vma - check whether a page is really mapped in a VMA * @page: the page to test * @vma: the VMA to test * * Returns 1 if the page is mapped into the page tables of the VMA, 0 * if the page is not mapped into the page tables of this VMA. Only * valid for normal file or anonymous VMAs. */ |
6a46079cf HWPOISON: The hig... |
625 |
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma) |
b291f0003 mlock: mlocked pa... |
626 627 628 629 |
{ unsigned long address; pte_t *pte; spinlock_t *ptl; |
86c2ad199 mm rmap: remove v... |
630 631 |
address = __vma_address(page, vma); if (unlikely(address < vma->vm_start || address >= vma->vm_end)) |
b291f0003 mlock: mlocked pa... |
632 633 634 635 636 637 638 639 |
return 0; pte = page_check_address(page, vma->vm_mm, address, &ptl, 1); if (!pte) /* the page is not in this mm */ return 0; pte_unmap_unlock(pte, ptl); return 1; } |
9f32624be mm/rmap: use rmap... |
640 641 642 643 644 645 |
struct page_referenced_arg { int mapcount; int referenced; unsigned long vm_flags; struct mem_cgroup *memcg; }; |
81b4082dc [PATCH] mm: rmap.... |
646 |
/* |
9f32624be mm/rmap: use rmap... |
647 |
* arg: page_referenced_arg will be passed |
1da177e4c Linux-2.6.12-rc2 |
648 |
*/ |
ac7695012 mm/rmap.c: make p... |
649 |
static int page_referenced_one(struct page *page, struct vm_area_struct *vma, |
9f32624be mm/rmap: use rmap... |
650 |
unsigned long address, void *arg) |
1da177e4c Linux-2.6.12-rc2 |
651 652 |
{ struct mm_struct *mm = vma->vm_mm; |
117b0791a mm, thp: move ptl... |
653 |
spinlock_t *ptl; |
1da177e4c Linux-2.6.12-rc2 |
654 |
int referenced = 0; |
9f32624be mm/rmap: use rmap... |
655 |
struct page_referenced_arg *pra = arg; |
1da177e4c Linux-2.6.12-rc2 |
656 |
|
71e3aac07 thp: transparent ... |
657 658 |
if (unlikely(PageTransHuge(page))) { pmd_t *pmd; |
2da28bfd9 thp: fix page_ref... |
659 660 661 662 |
/* * rmap might return false positives; we must filter * these out using page_check_address_pmd(). */ |
71e3aac07 thp: transparent ... |
663 |
pmd = page_check_address_pmd(page, mm, address, |
117b0791a mm, thp: move ptl... |
664 665 |
PAGE_CHECK_ADDRESS_PMD_FLAG, &ptl); if (!pmd) |
9f32624be mm/rmap: use rmap... |
666 |
return SWAP_AGAIN; |
2da28bfd9 thp: fix page_ref... |
667 668 |
if (vma->vm_flags & VM_LOCKED) { |
117b0791a mm, thp: move ptl... |
669 |
spin_unlock(ptl); |
9f32624be mm/rmap: use rmap... |
670 671 |
pra->vm_flags |= VM_LOCKED; return SWAP_FAIL; /* To break the loop */ |
2da28bfd9 thp: fix page_ref... |
672 673 674 675 |
} /* go ahead even if the pmd is pmd_trans_splitting() */ if (pmdp_clear_flush_young_notify(vma, address, pmd)) |
71e3aac07 thp: transparent ... |
676 |
referenced++; |
117b0791a mm, thp: move ptl... |
677 |
spin_unlock(ptl); |
71e3aac07 thp: transparent ... |
678 679 |
} else { pte_t *pte; |
71e3aac07 thp: transparent ... |
680 |
|
2da28bfd9 thp: fix page_ref... |
681 682 683 684 |
/* * rmap might return false positives; we must filter * these out using page_check_address(). */ |
71e3aac07 thp: transparent ... |
685 686 |
pte = page_check_address(page, mm, address, &ptl, 0); if (!pte) |
9f32624be mm/rmap: use rmap... |
687 |
return SWAP_AGAIN; |
71e3aac07 thp: transparent ... |
688 |
|
2da28bfd9 thp: fix page_ref... |
689 690 |
if (vma->vm_flags & VM_LOCKED) { pte_unmap_unlock(pte, ptl); |
9f32624be mm/rmap: use rmap... |
691 692 |
pra->vm_flags |= VM_LOCKED; return SWAP_FAIL; /* To break the loop */ |
2da28bfd9 thp: fix page_ref... |
693 |
} |
71e3aac07 thp: transparent ... |
694 695 696 697 698 699 700 701 |
if (ptep_clear_flush_young_notify(vma, address, pte)) { /* * Don't treat a reference through a sequentially read * mapping as such. If the page has been used in * another mapping, we will catch it; if this other * mapping is already gone, the unmap path will have * set PG_referenced or activated the page. */ |
64363aad5 mm: remove unused... |
702 |
if (likely(!(vma->vm_flags & VM_SEQ_READ))) |
71e3aac07 thp: transparent ... |
703 704 705 706 |
referenced++; } pte_unmap_unlock(pte, ptl); } |
9f32624be mm/rmap: use rmap... |
707 708 709 |
if (referenced) { pra->referenced++; pra->vm_flags |= vma->vm_flags; |
1da177e4c Linux-2.6.12-rc2 |
710 |
} |
34bbd7040 [PATCH] adapt pag... |
711 |
|
9f32624be mm/rmap: use rmap... |
712 713 714 715 716 |
pra->mapcount--; if (!pra->mapcount) return SWAP_SUCCESS; /* To break the loop */ return SWAP_AGAIN; |
1da177e4c Linux-2.6.12-rc2 |
717 |
} |
9f32624be mm/rmap: use rmap... |
718 |
static bool invalid_page_referenced_vma(struct vm_area_struct *vma, void *arg) |
1da177e4c Linux-2.6.12-rc2 |
719 |
{ |
9f32624be mm/rmap: use rmap... |
720 721 |
struct page_referenced_arg *pra = arg; struct mem_cgroup *memcg = pra->memcg; |
1da177e4c Linux-2.6.12-rc2 |
722 |
|
9f32624be mm/rmap: use rmap... |
723 724 |
if (!mm_match_cgroup(vma->vm_mm, memcg)) return true; |
1da177e4c Linux-2.6.12-rc2 |
725 |
|
9f32624be mm/rmap: use rmap... |
726 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
727 728 729 730 731 732 |
} /** * page_referenced - test if the page was referenced * @page: the page to test * @is_locked: caller holds lock on the page |
72835c86c mm: unify remaini... |
733 |
* @memcg: target memory cgroup |
6fe6b7e35 vmscan: report vm... |
734 |
* @vm_flags: collect encountered vma->vm_flags who actually referenced the page |
1da177e4c Linux-2.6.12-rc2 |
735 736 737 738 |
* * Quick test_and_clear_referenced for all mappings to a page, * returns the number of ptes which referenced the page. */ |
6fe6b7e35 vmscan: report vm... |
739 740 |
int page_referenced(struct page *page, int is_locked, |
72835c86c mm: unify remaini... |
741 |
struct mem_cgroup *memcg, |
6fe6b7e35 vmscan: report vm... |
742 |
unsigned long *vm_flags) |
1da177e4c Linux-2.6.12-rc2 |
743 |
{ |
9f32624be mm/rmap: use rmap... |
744 |
int ret; |
5ad646880 ksm: let shared p... |
745 |
int we_locked = 0; |
9f32624be mm/rmap: use rmap... |
746 747 748 749 750 751 752 753 754 |
struct page_referenced_arg pra = { .mapcount = page_mapcount(page), .memcg = memcg, }; struct rmap_walk_control rwc = { .rmap_one = page_referenced_one, .arg = (void *)&pra, .anon_lock = page_lock_anon_vma_read, }; |
1da177e4c Linux-2.6.12-rc2 |
755 |
|
6fe6b7e35 vmscan: report vm... |
756 |
*vm_flags = 0; |
9f32624be mm/rmap: use rmap... |
757 758 759 760 761 762 763 764 765 766 |
if (!page_mapped(page)) return 0; if (!page_rmapping(page)) return 0; if (!is_locked && (!PageAnon(page) || PageKsm(page))) { we_locked = trylock_page(page); if (!we_locked) return 1; |
1da177e4c Linux-2.6.12-rc2 |
767 |
} |
9f32624be mm/rmap: use rmap... |
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 |
/* * If we are reclaiming on behalf of a cgroup, skip * counting on behalf of references from different * cgroups */ if (memcg) { rwc.invalid_vma = invalid_page_referenced_vma; } ret = rmap_walk(page, &rwc); *vm_flags = pra.vm_flags; if (we_locked) unlock_page(page); return pra.referenced; |
1da177e4c Linux-2.6.12-rc2 |
785 |
} |
1cb1729b1 mm: pass address ... |
786 |
static int page_mkclean_one(struct page *page, struct vm_area_struct *vma, |
9853a407b mm/rmap: use rmap... |
787 |
unsigned long address, void *arg) |
d08b3851d [PATCH] mm: track... |
788 789 |
{ struct mm_struct *mm = vma->vm_mm; |
c2fda5fed [PATCH] Fix up pa... |
790 |
pte_t *pte; |
d08b3851d [PATCH] mm: track... |
791 792 |
spinlock_t *ptl; int ret = 0; |
9853a407b mm/rmap: use rmap... |
793 |
int *cleaned = arg; |
d08b3851d [PATCH] mm: track... |
794 |
|
479db0bf4 mm: dirty page tr... |
795 |
pte = page_check_address(page, mm, address, &ptl, 1); |
d08b3851d [PATCH] mm: track... |
796 797 |
if (!pte) goto out; |
c2fda5fed [PATCH] Fix up pa... |
798 799 |
if (pte_dirty(*pte) || pte_write(*pte)) { pte_t entry; |
d08b3851d [PATCH] mm: track... |
800 |
|
c2fda5fed [PATCH] Fix up pa... |
801 |
flush_cache_page(vma, address, pte_pfn(*pte)); |
2ec74c3ef mm: move all mmu ... |
802 |
entry = ptep_clear_flush(vma, address, pte); |
c2fda5fed [PATCH] Fix up pa... |
803 804 |
entry = pte_wrprotect(entry); entry = pte_mkclean(entry); |
d6e88e671 [PATCH] page_mkcl... |
805 |
set_pte_at(mm, address, pte, entry); |
c2fda5fed [PATCH] Fix up pa... |
806 807 |
ret = 1; } |
d08b3851d [PATCH] mm: track... |
808 |
|
d08b3851d [PATCH] mm: track... |
809 |
pte_unmap_unlock(pte, ptl); |
2ec74c3ef mm: move all mmu ... |
810 |
|
9853a407b mm/rmap: use rmap... |
811 |
if (ret) { |
2ec74c3ef mm: move all mmu ... |
812 |
mmu_notifier_invalidate_page(mm, address); |
9853a407b mm/rmap: use rmap... |
813 814 |
(*cleaned)++; } |
d08b3851d [PATCH] mm: track... |
815 |
out: |
9853a407b mm/rmap: use rmap... |
816 |
return SWAP_AGAIN; |
d08b3851d [PATCH] mm: track... |
817 |
} |
9853a407b mm/rmap: use rmap... |
818 |
static bool invalid_mkclean_vma(struct vm_area_struct *vma, void *arg) |
d08b3851d [PATCH] mm: track... |
819 |
{ |
9853a407b mm/rmap: use rmap... |
820 |
if (vma->vm_flags & VM_SHARED) |
871beb8c3 mm/rmap: fix cocc... |
821 |
return false; |
d08b3851d [PATCH] mm: track... |
822 |
|
871beb8c3 mm/rmap: fix cocc... |
823 |
return true; |
d08b3851d [PATCH] mm: track... |
824 825 826 827 |
} int page_mkclean(struct page *page) { |
9853a407b mm/rmap: use rmap... |
828 829 830 831 832 833 834 |
int cleaned = 0; struct address_space *mapping; struct rmap_walk_control rwc = { .arg = (void *)&cleaned, .rmap_one = page_mkclean_one, .invalid_vma = invalid_mkclean_vma, }; |
d08b3851d [PATCH] mm: track... |
835 836 |
BUG_ON(!PageLocked(page)); |
9853a407b mm/rmap: use rmap... |
837 838 839 840 841 842 843 844 |
if (!page_mapped(page)) return 0; mapping = page_mapping(page); if (!mapping) return 0; rmap_walk(page, &rwc); |
d08b3851d [PATCH] mm: track... |
845 |
|
9853a407b mm/rmap: use rmap... |
846 |
return cleaned; |
d08b3851d [PATCH] mm: track... |
847 |
} |
60b59beaf fbdev: mm: Deferr... |
848 |
EXPORT_SYMBOL_GPL(page_mkclean); |
d08b3851d [PATCH] mm: track... |
849 |
|
1da177e4c Linux-2.6.12-rc2 |
850 |
/** |
c44b67432 rmap: move exclus... |
851 852 853 854 855 856 857 858 859 860 861 862 863 864 |
* page_move_anon_rmap - move a page to our anon_vma * @page: the page to move to our anon_vma * @vma: the vma the page belongs to * @address: the user virtual address mapped * * When a page belongs exclusively to one process after a COW event, * that page can be moved into the anon_vma that belongs to just that * process, so the rmap code will not search the parent or sibling * processes. */ void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { struct anon_vma *anon_vma = vma->anon_vma; |
309381fea mm: dump page whe... |
865 |
VM_BUG_ON_PAGE(!PageLocked(page), page); |
81d1b09c6 mm: convert a few... |
866 |
VM_BUG_ON_VMA(!anon_vma, vma); |
309381fea mm: dump page whe... |
867 |
VM_BUG_ON_PAGE(page->index != linear_page_index(vma, address), page); |
c44b67432 rmap: move exclus... |
868 869 870 871 872 873 |
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON; page->mapping = (struct address_space *) anon_vma; } /** |
4e1c19750 Clean up __page_s... |
874 875 876 877 |
* __page_set_anon_rmap - set up new anonymous rmap * @page: Page to add to rmap * @vma: VM area to add page to. * @address: User virtual address of the mapping |
e8a03feb5 rmap: add exclusi... |
878 |
* @exclusive: the page is exclusively owned by the current process |
9617d95e6 [PATCH] mm: rmap ... |
879 880 |
*/ static void __page_set_anon_rmap(struct page *page, |
e8a03feb5 rmap: add exclusi... |
881 |
struct vm_area_struct *vma, unsigned long address, int exclusive) |
9617d95e6 [PATCH] mm: rmap ... |
882 |
{ |
e8a03feb5 rmap: add exclusi... |
883 |
struct anon_vma *anon_vma = vma->anon_vma; |
ea90002b0 anonvma: when set... |
884 |
|
e8a03feb5 rmap: add exclusi... |
885 |
BUG_ON(!anon_vma); |
ea90002b0 anonvma: when set... |
886 |
|
4e1c19750 Clean up __page_s... |
887 888 |
if (PageAnon(page)) return; |
ea90002b0 anonvma: when set... |
889 |
/* |
e8a03feb5 rmap: add exclusi... |
890 891 892 |
* If the page isn't exclusively mapped into this vma, * we must use the _oldest_ possible anon_vma for the * page mapping! |
ea90002b0 anonvma: when set... |
893 |
*/ |
4e1c19750 Clean up __page_s... |
894 |
if (!exclusive) |
288468c33 rmap: always use ... |
895 |
anon_vma = anon_vma->root; |
9617d95e6 [PATCH] mm: rmap ... |
896 |
|
9617d95e6 [PATCH] mm: rmap ... |
897 898 |
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON; page->mapping = (struct address_space *) anon_vma; |
9617d95e6 [PATCH] mm: rmap ... |
899 |
page->index = linear_page_index(vma, address); |
9617d95e6 [PATCH] mm: rmap ... |
900 901 902 |
} /** |
43d8eac44 mm: rmap kernel-d... |
903 |
* __page_check_anon_rmap - sanity check anonymous rmap addition |
c97a9e10e mm: more rmap che... |
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 |
* @page: the page to add the mapping to * @vma: the vm area in which the mapping is added * @address: the user virtual address mapped */ static void __page_check_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { #ifdef CONFIG_DEBUG_VM /* * The page's anon-rmap details (mapping and index) are guaranteed to * be set up correctly at this point. * * We have exclusion against page_add_anon_rmap because the caller * always holds the page locked, except if called from page_dup_rmap, * in which case the page is already known to be setup. * * We have exclusion against page_add_new_anon_rmap because those pages * are initially only visible via the pagetables, and the pte is locked * over the call to page_add_new_anon_rmap. */ |
44ab57a06 rmap: add anon_vm... |
924 |
BUG_ON(page_anon_vma(page)->root != vma->anon_vma->root); |
c97a9e10e mm: more rmap che... |
925 926 927 928 929 |
BUG_ON(page->index != linear_page_index(vma, address)); #endif } /** |
1da177e4c Linux-2.6.12-rc2 |
930 931 932 933 934 |
* page_add_anon_rmap - add pte mapping to an anonymous page * @page: the page to add the mapping to * @vma: the vm area in which the mapping is added * @address: the user virtual address mapped * |
5ad646880 ksm: let shared p... |
935 |
* The caller needs to hold the pte lock, and the page must be locked in |
80e148226 ksm: share anon p... |
936 937 938 |
* the anon_vma case: to serialize mapping,index checking after setting, * and to ensure that PageAnon is not being upgraded racily to PageKsm * (but PageKsm is never downgraded to PageAnon). |
1da177e4c Linux-2.6.12-rc2 |
939 940 941 942 |
*/ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { |
ad8c2ee80 rmap: add exclusi... |
943 944 945 946 947 948 949 950 951 952 953 |
do_page_add_anon_rmap(page, vma, address, 0); } /* * Special version of the above for do_swap_page, which often runs * into pages that are exclusively owned by the current process. * Everybody else should continue to use page_add_anon_rmap above. */ void do_page_add_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address, int exclusive) { |
5ad646880 ksm: let shared p... |
954 |
int first = atomic_inc_and_test(&page->_mapcount); |
79134171d thp: transparent ... |
955 |
if (first) { |
bea04b073 mm: use the light... |
956 957 958 959 960 961 |
/* * We use the irq-unsafe __{inc|mod}_zone_page_stat because * these counters are not modified in interrupt context, and * pte lock(a spinlock) is held, which implies preemption * disabled. */ |
3cd14fcd3 thp: account anon... |
962 |
if (PageTransHuge(page)) |
79134171d thp: transparent ... |
963 964 |
__inc_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES); |
3cd14fcd3 thp: account anon... |
965 966 |
__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, hpage_nr_pages(page)); |
79134171d thp: transparent ... |
967 |
} |
5ad646880 ksm: let shared p... |
968 969 |
if (unlikely(PageKsm(page))) return; |
309381fea mm: dump page whe... |
970 |
VM_BUG_ON_PAGE(!PageLocked(page), page); |
5dbe0af47 mm: fix kernel BU... |
971 |
/* address might be in next vma when migration races vma_adjust */ |
5ad646880 ksm: let shared p... |
972 |
if (first) |
ad8c2ee80 rmap: add exclusi... |
973 |
__page_set_anon_rmap(page, vma, address, exclusive); |
69029cd55 memcg: remove ref... |
974 |
else |
c97a9e10e mm: more rmap che... |
975 |
__page_check_anon_rmap(page, vma, address); |
1da177e4c Linux-2.6.12-rc2 |
976 |
} |
43d8eac44 mm: rmap kernel-d... |
977 |
/** |
9617d95e6 [PATCH] mm: rmap ... |
978 979 980 981 982 983 984 |
* page_add_new_anon_rmap - add pte mapping to a new anonymous page * @page: the page to add the mapping to * @vma: the vm area in which the mapping is added * @address: the user virtual address mapped * * Same as page_add_anon_rmap but must only be called on *new* pages. * This means the inc-and-test can be bypassed. |
c97a9e10e mm: more rmap che... |
985 |
* Page does not have to be locked. |
9617d95e6 [PATCH] mm: rmap ... |
986 987 988 989 |
*/ void page_add_new_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { |
81d1b09c6 mm: convert a few... |
990 |
VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); |
cbf84b7ad mm: further clean... |
991 992 |
SetPageSwapBacked(page); atomic_set(&page->_mapcount, 0); /* increment count (starts at -1) */ |
3cd14fcd3 thp: account anon... |
993 |
if (PageTransHuge(page)) |
79134171d thp: transparent ... |
994 |
__inc_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES); |
3cd14fcd3 thp: account anon... |
995 996 |
__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, hpage_nr_pages(page)); |
e8a03feb5 rmap: add exclusi... |
997 |
__page_set_anon_rmap(page, vma, address, 1); |
9617d95e6 [PATCH] mm: rmap ... |
998 |
} |
1da177e4c Linux-2.6.12-rc2 |
999 1000 1001 1002 |
/** * page_add_file_rmap - add pte mapping to a file page * @page: the page to add the mapping to * |
b8072f099 [PATCH] mm: updat... |
1003 |
* The caller needs to hold the pte lock. |
1da177e4c Linux-2.6.12-rc2 |
1004 1005 1006 |
*/ void page_add_file_rmap(struct page *page) { |
d7365e783 mm: memcontrol: f... |
1007 |
struct mem_cgroup *memcg; |
89c06bd52 memcg: use new lo... |
1008 |
unsigned long flags; |
d7365e783 mm: memcontrol: f... |
1009 |
bool locked; |
89c06bd52 memcg: use new lo... |
1010 |
|
d7365e783 mm: memcontrol: f... |
1011 |
memcg = mem_cgroup_begin_page_stat(page, &locked, &flags); |
d69b042f3 memcg: add file-b... |
1012 |
if (atomic_inc_and_test(&page->_mapcount)) { |
65ba55f50 [PATCH] zoned vm ... |
1013 |
__inc_zone_page_state(page, NR_FILE_MAPPED); |
d7365e783 mm: memcontrol: f... |
1014 |
mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED); |
d69b042f3 memcg: add file-b... |
1015 |
} |
d7365e783 mm: memcontrol: f... |
1016 |
mem_cgroup_end_page_stat(memcg, locked, flags); |
1da177e4c Linux-2.6.12-rc2 |
1017 |
} |
8186eb6a7 mm: rmap: split o... |
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 |
static void page_remove_file_rmap(struct page *page) { struct mem_cgroup *memcg; unsigned long flags; bool locked; memcg = mem_cgroup_begin_page_stat(page, &locked, &flags); /* page still mapped by someone else? */ if (!atomic_add_negative(-1, &page->_mapcount)) goto out; /* Hugepages are not counted in NR_FILE_MAPPED for now. */ if (unlikely(PageHuge(page))) goto out; /* * We use the irq-unsafe __{inc|mod}_zone_page_stat because * these counters are not modified in interrupt context, and * pte lock(a spinlock) is held, which implies preemption disabled. */ __dec_zone_page_state(page, NR_FILE_MAPPED); mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED); if (unlikely(PageMlocked(page))) clear_page_mlock(page); out: mem_cgroup_end_page_stat(memcg, locked, flags); } |
1da177e4c Linux-2.6.12-rc2 |
1047 1048 1049 1050 |
/** * page_remove_rmap - take down pte mapping from a page * @page: page to remove mapping from * |
b8072f099 [PATCH] mm: updat... |
1051 |
* The caller needs to hold the pte lock. |
1da177e4c Linux-2.6.12-rc2 |
1052 |
*/ |
edc315fd2 badpage: remove v... |
1053 |
void page_remove_rmap(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
1054 |
{ |
8186eb6a7 mm: rmap: split o... |
1055 1056 1057 1058 |
if (!PageAnon(page)) { page_remove_file_rmap(page); return; } |
89c06bd52 memcg: use new lo... |
1059 |
|
b904dcfed mm: clean up page... |
1060 1061 |
/* page still mapped by someone else? */ if (!atomic_add_negative(-1, &page->_mapcount)) |
8186eb6a7 mm: rmap: split o... |
1062 1063 1064 1065 1066 |
return; /* Hugepages are not counted in NR_ANON_PAGES for now. */ if (unlikely(PageHuge(page))) return; |
b904dcfed mm: clean up page... |
1067 1068 |
/* |
bea04b073 mm: use the light... |
1069 1070 |
* We use the irq-unsafe __{inc|mod}_zone_page_stat because * these counters are not modified in interrupt context, and |
bea04b073 mm: use the light... |
1071 |
* pte lock(a spinlock) is held, which implies preemption disabled. |
0fe6e20b9 hugetlb, rmap: ad... |
1072 |
*/ |
8186eb6a7 mm: rmap: split o... |
1073 1074 1075 1076 1077 |
if (PageTransHuge(page)) __dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES); __mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -hpage_nr_pages(page)); |
e6c509f85 mm: use clear_pag... |
1078 1079 |
if (unlikely(PageMlocked(page))) clear_page_mlock(page); |
8186eb6a7 mm: rmap: split o... |
1080 |
|
b904dcfed mm: clean up page... |
1081 1082 1083 1084 1085 1086 1087 1088 1089 |
/* * It would be tidy to reset the PageAnon mapping here, * but that might overwrite a racing page_add_anon_rmap * which increments mapcount after us but sets mapping * before us: so leave the reset to free_hot_cold_page, * and remember that it's only reliable while mapped. * Leaving it set also helps swapoff to reinstate ptes * faster for those pages still in swapcache. */ |
1da177e4c Linux-2.6.12-rc2 |
1090 1091 1092 |
} /* |
526295064 mm/rmap: use rmap... |
1093 |
* @arg: enum ttu_flags will be passed to this argument |
1da177e4c Linux-2.6.12-rc2 |
1094 |
*/ |
ac7695012 mm/rmap.c: make p... |
1095 |
static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, |
526295064 mm/rmap: use rmap... |
1096 |
unsigned long address, void *arg) |
1da177e4c Linux-2.6.12-rc2 |
1097 1098 |
{ struct mm_struct *mm = vma->vm_mm; |
1da177e4c Linux-2.6.12-rc2 |
1099 1100 |
pte_t *pte; pte_t pteval; |
c0718806c [PATCH] mm: rmap ... |
1101 |
spinlock_t *ptl; |
1da177e4c Linux-2.6.12-rc2 |
1102 |
int ret = SWAP_AGAIN; |
526295064 mm/rmap: use rmap... |
1103 |
enum ttu_flags flags = (enum ttu_flags)arg; |
1da177e4c Linux-2.6.12-rc2 |
1104 |
|
479db0bf4 mm: dirty page tr... |
1105 |
pte = page_check_address(page, mm, address, &ptl, 0); |
c0718806c [PATCH] mm: rmap ... |
1106 |
if (!pte) |
81b4082dc [PATCH] mm: rmap.... |
1107 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1108 1109 1110 1111 1112 1113 |
/* * If the page is mlock()d, we cannot swap it out. * If it's recently referenced (perhaps page_referenced * skipped over this mm) then we should reactivate it. */ |
14fa31b89 HWPOISON: Use bit... |
1114 |
if (!(flags & TTU_IGNORE_MLOCK)) { |
caed0f486 mm: simplify try_... |
1115 1116 |
if (vma->vm_flags & VM_LOCKED) goto out_mlock; |
daa5ba768 mm/rmap.c: cleanu... |
1117 |
if (flags & TTU_MUNLOCK) |
53f79acb6 mm: mlocking in t... |
1118 |
goto out_unmap; |
14fa31b89 HWPOISON: Use bit... |
1119 1120 |
} if (!(flags & TTU_IGNORE_ACCESS)) { |
b291f0003 mlock: mlocked pa... |
1121 1122 1123 1124 1125 |
if (ptep_clear_flush_young_notify(vma, address, pte)) { ret = SWAP_FAIL; goto out_unmap; } } |
1da177e4c Linux-2.6.12-rc2 |
1126 |
|
1da177e4c Linux-2.6.12-rc2 |
1127 1128 |
/* Nuke the page table entry. */ flush_cache_page(vma, address, page_to_pfn(page)); |
2ec74c3ef mm: move all mmu ... |
1129 |
pteval = ptep_clear_flush(vma, address, pte); |
1da177e4c Linux-2.6.12-rc2 |
1130 1131 1132 1133 |
/* Move the dirty bit to the physical page now the pte is gone. */ if (pte_dirty(pteval)) set_page_dirty(page); |
365e9c87a [PATCH] mm: updat... |
1134 1135 |
/* Update high watermark before we lower rss */ update_hiwater_rss(mm); |
888b9f7c5 HWPOISON: Handle ... |
1136 |
if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) { |
5f24ae585 hwpoison, hugetlb... |
1137 1138 1139 1140 1141 1142 |
if (!PageHuge(page)) { if (PageAnon(page)) dec_mm_counter(mm, MM_ANONPAGES); else dec_mm_counter(mm, MM_FILEPAGES); } |
888b9f7c5 HWPOISON: Handle ... |
1143 |
set_pte_at(mm, address, pte, |
5f24ae585 hwpoison, hugetlb... |
1144 |
swp_entry_to_pte(make_hwpoison_entry(page))); |
45961722f mm: add support f... |
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 |
} else if (pte_unused(pteval)) { /* * The guest indicated that the page content is of no * interest anymore. Simply discard the pte, vmscan * will take care of the rest. */ if (PageAnon(page)) dec_mm_counter(mm, MM_ANONPAGES); else dec_mm_counter(mm, MM_FILEPAGES); |
888b9f7c5 HWPOISON: Handle ... |
1155 |
} else if (PageAnon(page)) { |
4c21e2f24 [PATCH] mm: split... |
1156 |
swp_entry_t entry = { .val = page_private(page) }; |
179ef71cb mm: save soft-dir... |
1157 |
pte_t swp_pte; |
0697212a4 [PATCH] Swapless ... |
1158 1159 1160 1161 1162 1163 |
if (PageSwapCache(page)) { /* * Store the swap location in the pte. * See handle_pte_fault() ... */ |
570a335b8 swap_info: swap c... |
1164 1165 1166 1167 1168 |
if (swap_duplicate(entry) < 0) { set_pte_at(mm, address, pte, pteval); ret = SWAP_FAIL; goto out_unmap; } |
0697212a4 [PATCH] Swapless ... |
1169 1170 1171 1172 1173 1174 |
if (list_empty(&mm->mmlist)) { spin_lock(&mmlist_lock); if (list_empty(&mm->mmlist)) list_add(&mm->mmlist, &init_mm.mmlist); spin_unlock(&mmlist_lock); } |
d559db086 mm: clean up mm_c... |
1175 |
dec_mm_counter(mm, MM_ANONPAGES); |
b084d4353 mm: count swap usage |
1176 |
inc_mm_counter(mm, MM_SWAPENTS); |
ce1744f4e mm: replace PAGE_... |
1177 |
} else if (IS_ENABLED(CONFIG_MIGRATION)) { |
0697212a4 [PATCH] Swapless ... |
1178 1179 1180 1181 1182 |
/* * Store the pfn of the page in a special migration * pte. do_swap_page() will wait until the migration * pte is removed and then restart fault handling. */ |
daa5ba768 mm/rmap.c: cleanu... |
1183 |
BUG_ON(!(flags & TTU_MIGRATION)); |
0697212a4 [PATCH] Swapless ... |
1184 |
entry = make_migration_entry(page, pte_write(pteval)); |
1da177e4c Linux-2.6.12-rc2 |
1185 |
} |
179ef71cb mm: save soft-dir... |
1186 1187 1188 1189 |
swp_pte = swp_entry_to_pte(entry); if (pte_soft_dirty(pteval)) swp_pte = pte_swp_mksoft_dirty(swp_pte); set_pte_at(mm, address, pte, swp_pte); |
1da177e4c Linux-2.6.12-rc2 |
1190 |
BUG_ON(pte_file(*pte)); |
ce1744f4e mm: replace PAGE_... |
1191 |
} else if (IS_ENABLED(CONFIG_MIGRATION) && |
daa5ba768 mm/rmap.c: cleanu... |
1192 |
(flags & TTU_MIGRATION)) { |
04e62a29b [PATCH] More page... |
1193 1194 1195 1196 1197 |
/* Establish migration entry for a file page */ swp_entry_t entry; entry = make_migration_entry(page, pte_write(pteval)); set_pte_at(mm, address, pte, swp_entry_to_pte(entry)); } else |
d559db086 mm: clean up mm_c... |
1198 |
dec_mm_counter(mm, MM_FILEPAGES); |
1da177e4c Linux-2.6.12-rc2 |
1199 |
|
edc315fd2 badpage: remove v... |
1200 |
page_remove_rmap(page); |
1da177e4c Linux-2.6.12-rc2 |
1201 1202 1203 |
page_cache_release(page); out_unmap: |
c0718806c [PATCH] mm: rmap ... |
1204 |
pte_unmap_unlock(pte, ptl); |
daa5ba768 mm/rmap.c: cleanu... |
1205 |
if (ret != SWAP_FAIL && !(flags & TTU_MUNLOCK)) |
2ec74c3ef mm: move all mmu ... |
1206 |
mmu_notifier_invalidate_page(mm, address); |
caed0f486 mm: simplify try_... |
1207 1208 |
out: return ret; |
53f79acb6 mm: mlocking in t... |
1209 |
|
caed0f486 mm: simplify try_... |
1210 1211 1212 1213 1214 1215 1216 |
out_mlock: pte_unmap_unlock(pte, ptl); /* * We need mmap_sem locking, Otherwise VM_LOCKED check makes * unstable result and race. Plus, We can't wait here because |
5a505085f mm/rmap: Convert ... |
1217 |
* we now hold anon_vma->rwsem or mapping->i_mmap_mutex. |
caed0f486 mm: simplify try_... |
1218 1219 1220 1221 1222 1223 1224 1225 |
* if trylock failed, the page remain in evictable lru and later * vmscan could retry to move the page to unevictable lru if the * page is actually mlocked. */ if (down_read_trylock(&vma->vm_mm->mmap_sem)) { if (vma->vm_flags & VM_LOCKED) { mlock_vma_page(page); ret = SWAP_MLOCK; |
53f79acb6 mm: mlocking in t... |
1226 |
} |
caed0f486 mm: simplify try_... |
1227 |
up_read(&vma->vm_mm->mmap_sem); |
53f79acb6 mm: mlocking in t... |
1228 |
} |
1da177e4c Linux-2.6.12-rc2 |
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 |
return ret; } /* * objrmap doesn't work for nonlinear VMAs because the assumption that * offset-into-file correlates with offset-into-virtual-addresses does not hold. * Consequently, given a particular page and its ->index, we cannot locate the * ptes which are mapping that page without an exhaustive linear search. * * So what this code does is a mini "virtual scan" of each nonlinear VMA which * maps the file to which the target page belongs. The ->vm_private_data field * holds the current cursor into that scan. Successive searches will circulate * around the vma's virtual address space. * * So as more replacement pressure is applied to the pages in a nonlinear VMA, * more scanning pressure is placed against them as well. Eventually pages * will become fully unmapped and are eligible for eviction. * * For very sparsely populated VMAs this is a little inefficient - chances are * there there won't be many ptes located within the scan cluster. In this case * maybe we could scan further - to the end of the pte page, perhaps. |
b291f0003 mlock: mlocked pa... |
1250 1251 1252 1253 1254 |
* * Mlocked pages: check VM_LOCKED under mmap_sem held for read, if we can * acquire it without blocking. If vma locked, mlock the pages in the cluster, * rather than unmapping them. If we encounter the "check_page" that vmscan is * trying to unmap, return SWAP_MLOCK, else default SWAP_AGAIN. |
1da177e4c Linux-2.6.12-rc2 |
1255 1256 1257 |
*/ #define CLUSTER_SIZE min(32*PAGE_SIZE, PMD_SIZE) #define CLUSTER_MASK (~(CLUSTER_SIZE - 1)) |
b291f0003 mlock: mlocked pa... |
1258 1259 |
static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount, struct vm_area_struct *vma, struct page *check_page) |
1da177e4c Linux-2.6.12-rc2 |
1260 1261 |
{ struct mm_struct *mm = vma->vm_mm; |
1da177e4c Linux-2.6.12-rc2 |
1262 |
pmd_t *pmd; |
c0718806c [PATCH] mm: rmap ... |
1263 |
pte_t *pte; |
1da177e4c Linux-2.6.12-rc2 |
1264 |
pte_t pteval; |
c0718806c [PATCH] mm: rmap ... |
1265 |
spinlock_t *ptl; |
1da177e4c Linux-2.6.12-rc2 |
1266 1267 |
struct page *page; unsigned long address; |
2ec74c3ef mm: move all mmu ... |
1268 1269 |
unsigned long mmun_start; /* For mmu_notifiers */ unsigned long mmun_end; /* For mmu_notifiers */ |
1da177e4c Linux-2.6.12-rc2 |
1270 |
unsigned long end; |
b291f0003 mlock: mlocked pa... |
1271 1272 |
int ret = SWAP_AGAIN; int locked_vma = 0; |
1da177e4c Linux-2.6.12-rc2 |
1273 |
|
1da177e4c Linux-2.6.12-rc2 |
1274 1275 1276 1277 1278 1279 |
address = (vma->vm_start + cursor) & CLUSTER_MASK; end = address + CLUSTER_SIZE; if (address < vma->vm_start) address = vma->vm_start; if (end > vma->vm_end) end = vma->vm_end; |
6219049ae mm: introduce mm_... |
1280 1281 |
pmd = mm_find_pmd(mm, address); if (!pmd) |
b291f0003 mlock: mlocked pa... |
1282 |
return ret; |
2ec74c3ef mm: move all mmu ... |
1283 1284 1285 |
mmun_start = address; mmun_end = end; mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); |
b291f0003 mlock: mlocked pa... |
1286 |
/* |
af8e3354b mm: CONFIG_MMU fo... |
1287 |
* If we can acquire the mmap_sem for read, and vma is VM_LOCKED, |
b291f0003 mlock: mlocked pa... |
1288 1289 |
* keep the sem while scanning the cluster for mlocking pages. */ |
af8e3354b mm: CONFIG_MMU fo... |
1290 |
if (down_read_trylock(&vma->vm_mm->mmap_sem)) { |
b291f0003 mlock: mlocked pa... |
1291 1292 1293 1294 |
locked_vma = (vma->vm_flags & VM_LOCKED); if (!locked_vma) up_read(&vma->vm_mm->mmap_sem); /* don't need it */ } |
c0718806c [PATCH] mm: rmap ... |
1295 1296 |
pte = pte_offset_map_lock(mm, pmd, address, &ptl); |
1da177e4c Linux-2.6.12-rc2 |
1297 |
|
365e9c87a [PATCH] mm: updat... |
1298 1299 |
/* Update high watermark before we lower rss */ update_hiwater_rss(mm); |
c0718806c [PATCH] mm: rmap ... |
1300 |
for (; address < end; pte++, address += PAGE_SIZE) { |
1da177e4c Linux-2.6.12-rc2 |
1301 1302 |
if (!pte_present(*pte)) continue; |
6aab341e0 mm: re-architect ... |
1303 1304 |
page = vm_normal_page(vma, address, *pte); BUG_ON(!page || PageAnon(page)); |
1da177e4c Linux-2.6.12-rc2 |
1305 |
|
b291f0003 mlock: mlocked pa... |
1306 |
if (locked_vma) { |
57e68e9cd mm: try_to_unmap_... |
1307 1308 1309 |
if (page == check_page) { /* we know we have check_page locked */ mlock_vma_page(page); |
b291f0003 mlock: mlocked pa... |
1310 |
ret = SWAP_MLOCK; |
57e68e9cd mm: try_to_unmap_... |
1311 1312 1313 1314 1315 1316 1317 1318 1319 |
} else if (trylock_page(page)) { /* * If we can lock the page, perform mlock. * Otherwise leave the page alone, it will be * eventually encountered again later. */ mlock_vma_page(page); unlock_page(page); } |
b291f0003 mlock: mlocked pa... |
1320 1321 |
continue; /* don't unmap */ } |
571284680 kvm: Fix page age... |
1322 1323 1324 1325 1326 |
/* * No need for _notify because we're within an * mmu_notifier_invalidate_range_ {start|end} scope. */ if (ptep_clear_flush_young(vma, address, pte)) |
1da177e4c Linux-2.6.12-rc2 |
1327 1328 1329 |
continue; /* Nuke the page table entry. */ |
eca351336 [PATCH] Fix missi... |
1330 |
flush_cache_page(vma, address, pte_pfn(*pte)); |
2ec74c3ef mm: move all mmu ... |
1331 |
pteval = ptep_clear_flush(vma, address, pte); |
1da177e4c Linux-2.6.12-rc2 |
1332 1333 |
/* If nonlinear, store the file page offset in the pte. */ |
41bb3476b mm: save soft-dir... |
1334 1335 1336 |
if (page->index != linear_page_index(vma, address)) { pte_t ptfile = pgoff_to_pte(page->index); if (pte_soft_dirty(pteval)) |
b43790eed mm: softdirty: do... |
1337 |
ptfile = pte_file_mksoft_dirty(ptfile); |
41bb3476b mm: save soft-dir... |
1338 1339 |
set_pte_at(mm, address, pte, ptfile); } |
1da177e4c Linux-2.6.12-rc2 |
1340 1341 1342 1343 |
/* Move the dirty bit to the physical page now the pte is gone. */ if (pte_dirty(pteval)) set_page_dirty(page); |
edc315fd2 badpage: remove v... |
1344 |
page_remove_rmap(page); |
1da177e4c Linux-2.6.12-rc2 |
1345 |
page_cache_release(page); |
d559db086 mm: clean up mm_c... |
1346 |
dec_mm_counter(mm, MM_FILEPAGES); |
1da177e4c Linux-2.6.12-rc2 |
1347 1348 |
(*mapcount)--; } |
c0718806c [PATCH] mm: rmap ... |
1349 |
pte_unmap_unlock(pte - 1, ptl); |
2ec74c3ef mm: move all mmu ... |
1350 |
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |
b291f0003 mlock: mlocked pa... |
1351 1352 1353 |
if (locked_vma) up_read(&vma->vm_mm->mmap_sem); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1354 |
} |
0f843c6ac mm/rmap: factor n... |
1355 |
static int try_to_unmap_nonlinear(struct page *page, |
7e09e738a mm: fix swapops.h... |
1356 |
struct address_space *mapping, void *arg) |
0f843c6ac mm/rmap: factor n... |
1357 |
{ |
7e09e738a mm: fix swapops.h... |
1358 |
struct vm_area_struct *vma; |
0f843c6ac mm/rmap: factor n... |
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 |
int ret = SWAP_AGAIN; unsigned long cursor; unsigned long max_nl_cursor = 0; unsigned long max_nl_size = 0; unsigned int mapcount; list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.nonlinear) { cursor = (unsigned long) vma->vm_private_data; if (cursor > max_nl_cursor) max_nl_cursor = cursor; cursor = vma->vm_end - vma->vm_start; if (cursor > max_nl_size) max_nl_size = cursor; } if (max_nl_size == 0) { /* all nonlinears locked or reserved ? */ return SWAP_FAIL; } /* * We don't try to search for this page in the nonlinear vmas, * and page_referenced wouldn't have found it anyway. Instead * just walk the nonlinear vmas trying to age and unmap some. * The mapcount of the page we came in with is irrelevant, * but even so use it as a guide to how hard we should try? */ mapcount = page_mapcount(page); if (!mapcount) return ret; cond_resched(); max_nl_size = (max_nl_size + CLUSTER_SIZE - 1) & CLUSTER_MASK; if (max_nl_cursor == 0) max_nl_cursor = CLUSTER_SIZE; do { list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.nonlinear) { cursor = (unsigned long) vma->vm_private_data; while (cursor < max_nl_cursor && cursor < vma->vm_end - vma->vm_start) { if (try_to_unmap_cluster(cursor, &mapcount, vma, page) == SWAP_MLOCK) ret = SWAP_MLOCK; cursor += CLUSTER_SIZE; vma->vm_private_data = (void *) cursor; if ((int)mapcount <= 0) return ret; } vma->vm_private_data = (void *) max_nl_cursor; } cond_resched(); max_nl_cursor += CLUSTER_SIZE; } while (max_nl_cursor <= max_nl_size); /* * Don't loop forever (perhaps all the remaining pages are * in locked vmas). Reset cursor on all unreserved nonlinear * vmas, now forgetting on which ones it had fallen behind. */ list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.nonlinear) vma->vm_private_data = NULL; return ret; } |
71e3aac07 thp: transparent ... |
1428 |
bool is_vma_temporary_stack(struct vm_area_struct *vma) |
a8bef8ff6 mm: migration: av... |
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
{ int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP); if (!maybe_stack) return false; if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) == VM_STACK_INCOMPLETE_SETUP) return true; return false; } |
526295064 mm/rmap: use rmap... |
1441 1442 1443 1444 |
static bool invalid_migration_vma(struct vm_area_struct *vma, void *arg) { return is_vma_temporary_stack(vma); } |
526295064 mm/rmap: use rmap... |
1445 1446 1447 1448 |
static int page_not_mapped(struct page *page) { return !page_mapped(page); }; |
1da177e4c Linux-2.6.12-rc2 |
1449 1450 1451 |
/** * try_to_unmap - try to remove all page table mappings to a page * @page: the page to get unmapped |
14fa31b89 HWPOISON: Use bit... |
1452 |
* @flags: action and flags |
1da177e4c Linux-2.6.12-rc2 |
1453 1454 1455 1456 1457 1458 1459 1460 |
* * Tries to remove all the page table entries which are mapping this * page, used in the pageout path. Caller must hold the page lock. * Return values are: * * SWAP_SUCCESS - we succeeded in removing all mappings * SWAP_AGAIN - we missed a mapping, try again later * SWAP_FAIL - the page is unswappable |
b291f0003 mlock: mlocked pa... |
1461 |
* SWAP_MLOCK - page is mlocked. |
1da177e4c Linux-2.6.12-rc2 |
1462 |
*/ |
14fa31b89 HWPOISON: Use bit... |
1463 |
int try_to_unmap(struct page *page, enum ttu_flags flags) |
1da177e4c Linux-2.6.12-rc2 |
1464 1465 |
{ int ret; |
526295064 mm/rmap: use rmap... |
1466 1467 1468 1469 1470 1471 1472 |
struct rmap_walk_control rwc = { .rmap_one = try_to_unmap_one, .arg = (void *)flags, .done = page_not_mapped, .file_nonlinear = try_to_unmap_nonlinear, .anon_lock = page_lock_anon_vma_read, }; |
1da177e4c Linux-2.6.12-rc2 |
1473 |
|
309381fea mm: dump page whe... |
1474 |
VM_BUG_ON_PAGE(!PageHuge(page) && PageTransHuge(page), page); |
1da177e4c Linux-2.6.12-rc2 |
1475 |
|
526295064 mm/rmap: use rmap... |
1476 1477 1478 1479 1480 1481 1482 1483 |
/* * During exec, a temporary VMA is setup and later moved. * The VMA is moved under the anon_vma lock but not the * page tables leading to a race where migration cannot * find the migration ptes. Rather than increasing the * locking requirements of exec(), migration skips * temporary VMAs until after exec() completes. */ |
daa5ba768 mm/rmap.c: cleanu... |
1484 |
if ((flags & TTU_MIGRATION) && !PageKsm(page) && PageAnon(page)) |
526295064 mm/rmap: use rmap... |
1485 1486 1487 |
rwc.invalid_vma = invalid_migration_vma; ret = rmap_walk(page, &rwc); |
b291f0003 mlock: mlocked pa... |
1488 |
if (ret != SWAP_MLOCK && !page_mapped(page)) |
1da177e4c Linux-2.6.12-rc2 |
1489 1490 1491 |
ret = SWAP_SUCCESS; return ret; } |
81b4082dc [PATCH] mm: rmap.... |
1492 |
|
b291f0003 mlock: mlocked pa... |
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 |
/** * try_to_munlock - try to munlock a page * @page: the page to be munlocked * * Called from munlock code. Checks all of the VMAs mapping the page * to make sure nobody else has this page mlocked. The page will be * returned with PG_mlocked cleared if no other vmas have it mlocked. * * Return values are: * |
53f79acb6 mm: mlocking in t... |
1503 |
* SWAP_AGAIN - no vma is holding page mlocked, or, |
b291f0003 mlock: mlocked pa... |
1504 |
* SWAP_AGAIN - page mapped in mlocked vma -- couldn't acquire mmap sem |
5ad646880 ksm: let shared p... |
1505 |
* SWAP_FAIL - page cannot be located at present |
b291f0003 mlock: mlocked pa... |
1506 1507 1508 1509 |
* SWAP_MLOCK - page is now mlocked. */ int try_to_munlock(struct page *page) { |
e8351ac9b mm/rmap: use rmap... |
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 |
int ret; struct rmap_walk_control rwc = { .rmap_one = try_to_unmap_one, .arg = (void *)TTU_MUNLOCK, .done = page_not_mapped, /* * We don't bother to try to find the munlocked page in * nonlinears. It's costly. Instead, later, page reclaim logic * may call try_to_unmap() and recover PG_mlocked lazily. */ .file_nonlinear = NULL, .anon_lock = page_lock_anon_vma_read, }; |
309381fea mm: dump page whe... |
1524 |
VM_BUG_ON_PAGE(!PageLocked(page) || PageLRU(page), page); |
b291f0003 mlock: mlocked pa... |
1525 |
|
e8351ac9b mm/rmap: use rmap... |
1526 1527 |
ret = rmap_walk(page, &rwc); return ret; |
b291f0003 mlock: mlocked pa... |
1528 |
} |
e9995ef97 ksm: rmap_walk to... |
1529 |
|
01d8b20de mm: simplify anon... |
1530 |
void __put_anon_vma(struct anon_vma *anon_vma) |
76545066c mm: extend KSM re... |
1531 |
{ |
01d8b20de mm: simplify anon... |
1532 |
struct anon_vma *root = anon_vma->root; |
76545066c mm: extend KSM re... |
1533 |
|
624483f3e mm: rmap: fix use... |
1534 |
anon_vma_free(anon_vma); |
01d8b20de mm: simplify anon... |
1535 1536 |
if (root != anon_vma && atomic_dec_and_test(&root->refcount)) anon_vma_free(root); |
76545066c mm: extend KSM re... |
1537 |
} |
76545066c mm: extend KSM re... |
1538 |
|
0dd1c7bbc mm/rmap: extend r... |
1539 1540 |
static struct anon_vma *rmap_walk_anon_lock(struct page *page, struct rmap_walk_control *rwc) |
faecd8dd8 mm/rmap: factor l... |
1541 1542 |
{ struct anon_vma *anon_vma; |
0dd1c7bbc mm/rmap: extend r... |
1543 1544 |
if (rwc->anon_lock) return rwc->anon_lock(page); |
faecd8dd8 mm/rmap: factor l... |
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 |
/* * Note: remove_migration_ptes() cannot use page_lock_anon_vma_read() * because that depends on page_mapped(); but not all its usages * are holding mmap_sem. Users without mmap_sem are required to * take a reference count to prevent the anon_vma disappearing */ anon_vma = page_anon_vma(page); if (!anon_vma) return NULL; anon_vma_lock_read(anon_vma); return anon_vma; } |
e9995ef97 ksm: rmap_walk to... |
1558 |
/* |
e8351ac9b mm/rmap: use rmap... |
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 |
* rmap_walk_anon - do something to anonymous page using the object-based * rmap method * @page: the page to be handled * @rwc: control variable according to each walk type * * Find all the mappings of a page using the mapping pointer and the vma chains * contained in the anon_vma struct it points to. * * When called from try_to_munlock(), the mmap_sem of the mm containing the vma * where the page was found will be held for write. So, we won't recheck * vm_flags for that VMA. That should be OK, because that vma shouldn't be * LOCKED. |
e9995ef97 ksm: rmap_walk to... |
1571 |
*/ |
051ac83ad mm/rmap: make rma... |
1572 |
static int rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc) |
e9995ef97 ksm: rmap_walk to... |
1573 1574 |
{ struct anon_vma *anon_vma; |
a0f7a756c mm/rmap.c: fix pg... |
1575 |
pgoff_t pgoff = page_to_pgoff(page); |
5beb49305 mm: change anon_v... |
1576 |
struct anon_vma_chain *avc; |
e9995ef97 ksm: rmap_walk to... |
1577 |
int ret = SWAP_AGAIN; |
0dd1c7bbc mm/rmap: extend r... |
1578 |
anon_vma = rmap_walk_anon_lock(page, rwc); |
e9995ef97 ksm: rmap_walk to... |
1579 1580 |
if (!anon_vma) return ret; |
faecd8dd8 mm/rmap: factor l... |
1581 |
|
bf181b9f9 mm anon rmap: rep... |
1582 |
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) { |
5beb49305 mm: change anon_v... |
1583 |
struct vm_area_struct *vma = avc->vma; |
e9995ef97 ksm: rmap_walk to... |
1584 |
unsigned long address = vma_address(page, vma); |
0dd1c7bbc mm/rmap: extend r... |
1585 1586 1587 |
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg)) continue; |
051ac83ad mm/rmap: make rma... |
1588 |
ret = rwc->rmap_one(page, vma, address, rwc->arg); |
e9995ef97 ksm: rmap_walk to... |
1589 1590 |
if (ret != SWAP_AGAIN) break; |
0dd1c7bbc mm/rmap: extend r... |
1591 1592 |
if (rwc->done && rwc->done(page)) break; |
e9995ef97 ksm: rmap_walk to... |
1593 |
} |
4fc3f1d66 mm/rmap, migratio... |
1594 |
anon_vma_unlock_read(anon_vma); |
e9995ef97 ksm: rmap_walk to... |
1595 1596 |
return ret; } |
e8351ac9b mm/rmap: use rmap... |
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 |
/* * rmap_walk_file - do something to file page using the object-based rmap method * @page: the page to be handled * @rwc: control variable according to each walk type * * Find all the mappings of a page using the mapping pointer and the vma chains * contained in the address_space struct it points to. * * When called from try_to_munlock(), the mmap_sem of the mm containing the vma * where the page was found will be held for write. So, we won't recheck * vm_flags for that VMA. That should be OK, because that vma shouldn't be * LOCKED. */ |
051ac83ad mm/rmap: make rma... |
1610 |
static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc) |
e9995ef97 ksm: rmap_walk to... |
1611 1612 |
{ struct address_space *mapping = page->mapping; |
a0f7a756c mm/rmap.c: fix pg... |
1613 |
pgoff_t pgoff = page_to_pgoff(page); |
e9995ef97 ksm: rmap_walk to... |
1614 |
struct vm_area_struct *vma; |
e9995ef97 ksm: rmap_walk to... |
1615 |
int ret = SWAP_AGAIN; |
9f32624be mm/rmap: use rmap... |
1616 1617 1618 1619 1620 1621 |
/* * The page lock not only makes sure that page->mapping cannot * suddenly be NULLified by truncation, it makes sure that the * structure at mapping cannot be freed and reused yet, * so we can safely take mapping->i_mmap_mutex. */ |
81d1b09c6 mm: convert a few... |
1622 |
VM_BUG_ON_PAGE(!PageLocked(page), page); |
9f32624be mm/rmap: use rmap... |
1623 |
|
e9995ef97 ksm: rmap_walk to... |
1624 1625 |
if (!mapping) return ret; |
3d48ae45e mm: Convert i_mma... |
1626 |
mutex_lock(&mapping->i_mmap_mutex); |
6b2dbba8b mm: replace vma p... |
1627 |
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) { |
e9995ef97 ksm: rmap_walk to... |
1628 |
unsigned long address = vma_address(page, vma); |
0dd1c7bbc mm/rmap: extend r... |
1629 1630 1631 |
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg)) continue; |
051ac83ad mm/rmap: make rma... |
1632 |
ret = rwc->rmap_one(page, vma, address, rwc->arg); |
e9995ef97 ksm: rmap_walk to... |
1633 |
if (ret != SWAP_AGAIN) |
0dd1c7bbc mm/rmap: extend r... |
1634 1635 1636 |
goto done; if (rwc->done && rwc->done(page)) goto done; |
e9995ef97 ksm: rmap_walk to... |
1637 |
} |
0dd1c7bbc mm/rmap: extend r... |
1638 1639 1640 1641 1642 1643 |
if (!rwc->file_nonlinear) goto done; if (list_empty(&mapping->i_mmap_nonlinear)) goto done; |
7e09e738a mm: fix swapops.h... |
1644 |
ret = rwc->file_nonlinear(page, mapping, rwc->arg); |
0dd1c7bbc mm/rmap: extend r... |
1645 1646 |
done: |
3d48ae45e mm: Convert i_mma... |
1647 |
mutex_unlock(&mapping->i_mmap_mutex); |
e9995ef97 ksm: rmap_walk to... |
1648 1649 |
return ret; } |
051ac83ad mm/rmap: make rma... |
1650 |
int rmap_walk(struct page *page, struct rmap_walk_control *rwc) |
e9995ef97 ksm: rmap_walk to... |
1651 |
{ |
e9995ef97 ksm: rmap_walk to... |
1652 |
if (unlikely(PageKsm(page))) |
051ac83ad mm/rmap: make rma... |
1653 |
return rmap_walk_ksm(page, rwc); |
e9995ef97 ksm: rmap_walk to... |
1654 |
else if (PageAnon(page)) |
051ac83ad mm/rmap: make rma... |
1655 |
return rmap_walk_anon(page, rwc); |
e9995ef97 ksm: rmap_walk to... |
1656 |
else |
051ac83ad mm/rmap: make rma... |
1657 |
return rmap_walk_file(page, rwc); |
e9995ef97 ksm: rmap_walk to... |
1658 |
} |
0fe6e20b9 hugetlb, rmap: ad... |
1659 |
|
e3390f67a hwpoison: rename ... |
1660 |
#ifdef CONFIG_HUGETLB_PAGE |
0fe6e20b9 hugetlb, rmap: ad... |
1661 1662 1663 1664 1665 1666 1667 1668 1669 |
/* * The following three functions are for anonymous (private mapped) hugepages. * Unlike common anonymous pages, anonymous hugepages have no accounting code * and no lru code, because we handle hugepages differently from common pages. */ static void __hugepage_set_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address, int exclusive) { struct anon_vma *anon_vma = vma->anon_vma; |
433abed6c hugetlb, rmap: al... |
1670 |
|
0fe6e20b9 hugetlb, rmap: ad... |
1671 |
BUG_ON(!anon_vma); |
433abed6c hugetlb, rmap: al... |
1672 1673 1674 1675 1676 |
if (PageAnon(page)) return; if (!exclusive) anon_vma = anon_vma->root; |
0fe6e20b9 hugetlb, rmap: ad... |
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 |
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON; page->mapping = (struct address_space *) anon_vma; page->index = linear_page_index(vma, address); } void hugepage_add_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { struct anon_vma *anon_vma = vma->anon_vma; int first; |
a850ea303 hugetlb, rmap: ad... |
1687 1688 |
BUG_ON(!PageLocked(page)); |
0fe6e20b9 hugetlb, rmap: ad... |
1689 |
BUG_ON(!anon_vma); |
5dbe0af47 mm: fix kernel BU... |
1690 |
/* address might be in next vma when migration races vma_adjust */ |
0fe6e20b9 hugetlb, rmap: ad... |
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 |
first = atomic_inc_and_test(&page->_mapcount); if (first) __hugepage_set_anon_rmap(page, vma, address, 0); } void hugepage_add_new_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { BUG_ON(address < vma->vm_start || address >= vma->vm_end); atomic_set(&page->_mapcount, 0); __hugepage_set_anon_rmap(page, vma, address, 1); } |
e3390f67a hwpoison: rename ... |
1703 |
#endif /* CONFIG_HUGETLB_PAGE */ |