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mm/swap.c
28.7 KB
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/* * linux/mm/swap.c * * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds */ /* |
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* This file contains the default values for the operation of the |
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* Linux VM subsystem. Fine-tuning documentation can be found in * Documentation/sysctl/vm.txt. * Started 18.12.91 * Swap aging added 23.2.95, Stephen Tweedie. * Buffermem limits added 12.3.98, Rik van Riel. */ #include <linux/mm.h> #include <linux/sched.h> #include <linux/kernel_stat.h> #include <linux/swap.h> #include <linux/mman.h> #include <linux/pagemap.h> #include <linux/pagevec.h> #include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/mm_inline.h> |
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#include <linux/percpu_counter.h> |
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#include <linux/memremap.h> |
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#include <linux/percpu.h> #include <linux/cpu.h> #include <linux/notifier.h> |
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#include <linux/backing-dev.h> |
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#include <linux/memremap.h> |
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#include <linux/memcontrol.h> |
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#include <linux/gfp.h> |
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#include <linux/uio.h> |
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#include <linux/hugetlb.h> |
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#include <linux/page_idle.h> |
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|
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#include "internal.h" |
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#define CREATE_TRACE_POINTS #include <trace/events/pagemap.h> |
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/* How many pages do we try to swap or page in/out together? */ int page_cluster; |
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static DEFINE_PER_CPU(struct pagevec, lru_add_pvec); |
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static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs); |
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static DEFINE_PER_CPU(struct pagevec, lru_deactivate_file_pvecs); |
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static DEFINE_PER_CPU(struct pagevec, lru_lazyfree_pvecs); |
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#ifdef CONFIG_SMP static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs); #endif |
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|
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/* * This path almost never happens for VM activity - pages are normally * freed via pagevecs. But it gets used by networking. */ |
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static void __page_cache_release(struct page *page) |
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{ if (PageLRU(page)) { |
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struct zone *zone = page_zone(page); |
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struct lruvec *lruvec; unsigned long flags; |
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|
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spin_lock_irqsave(zone_lru_lock(zone), flags); |
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lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat); |
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VM_BUG_ON_PAGE(!PageLRU(page), page); |
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__ClearPageLRU(page); |
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del_page_from_lru_list(page, lruvec, page_off_lru(page)); |
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spin_unlock_irqrestore(zone_lru_lock(zone), flags); |
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} |
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__ClearPageWaiters(page); |
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mem_cgroup_uncharge(page); |
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} static void __put_single_page(struct page *page) { __page_cache_release(page); |
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free_unref_page(page); |
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} |
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static void __put_compound_page(struct page *page) |
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{ |
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compound_page_dtor *dtor; |
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|
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/* * __page_cache_release() is supposed to be called for thp, not for * hugetlb. This is because hugetlb page does never have PageLRU set * (it's never listed to any LRU lists) and no memcg routines should * be called for hugetlb (it has a separate hugetlb_cgroup.) */ if (!PageHuge(page)) __page_cache_release(page); |
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dtor = get_compound_page_dtor(page); (*dtor)(page); } |
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void __put_page(struct page *page) |
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{ |
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if (is_zone_device_page(page)) { put_dev_pagemap(page->pgmap); /* * The page belongs to the device that created pgmap. Do * not return it to page allocator. */ return; } |
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if (unlikely(PageCompound(page))) |
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__put_compound_page(page); else |
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__put_single_page(page); |
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} |
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EXPORT_SYMBOL(__put_page); |
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|
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/** |
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* put_pages_list() - release a list of pages * @pages: list of pages threaded on page->lru |
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* * Release a list of pages which are strung together on page.lru. Currently * used by read_cache_pages() and related error recovery code. |
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*/ void put_pages_list(struct list_head *pages) { while (!list_empty(pages)) { struct page *victim; victim = list_entry(pages->prev, struct page, lru); list_del(&victim->lru); |
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put_page(victim); |
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} } EXPORT_SYMBOL(put_pages_list); |
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/* * get_kernel_pages() - pin kernel pages in memory * @kiov: An array of struct kvec structures * @nr_segs: number of segments to pin * @write: pinning for read/write, currently ignored * @pages: array that receives pointers to the pages pinned. * Should be at least nr_segs long. * * Returns number of pages pinned. This may be fewer than the number * requested. If nr_pages is 0 or negative, returns 0. If no pages * were pinned, returns -errno. Each page returned must be released * with a put_page() call when it is finished with. */ int get_kernel_pages(const struct kvec *kiov, int nr_segs, int write, struct page **pages) { int seg; for (seg = 0; seg < nr_segs; seg++) { if (WARN_ON(kiov[seg].iov_len != PAGE_SIZE)) return seg; |
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pages[seg] = kmap_to_page(kiov[seg].iov_base); |
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get_page(pages[seg]); |
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} return seg; } EXPORT_SYMBOL_GPL(get_kernel_pages); /* * get_kernel_page() - pin a kernel page in memory * @start: starting kernel address * @write: pinning for read/write, currently ignored * @pages: array that receives pointer to the page pinned. * Must be at least nr_segs long. * * Returns 1 if page is pinned. If the page was not pinned, returns * -errno. The page returned must be released with a put_page() call * when it is finished with. */ int get_kernel_page(unsigned long start, int write, struct page **pages) { const struct kvec kiov = { .iov_base = (void *)start, .iov_len = PAGE_SIZE }; return get_kernel_pages(&kiov, 1, write, pages); } EXPORT_SYMBOL_GPL(get_kernel_page); |
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static void pagevec_lru_move_fn(struct pagevec *pvec, |
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void (*move_fn)(struct page *page, struct lruvec *lruvec, void *arg), void *arg) |
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{ int i; |
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struct pglist_data *pgdat = NULL; |
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struct lruvec *lruvec; |
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unsigned long flags = 0; |
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for (i = 0; i < pagevec_count(pvec); i++) { struct page *page = pvec->pages[i]; |
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struct pglist_data *pagepgdat = page_pgdat(page); |
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|
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if (pagepgdat != pgdat) { if (pgdat) spin_unlock_irqrestore(&pgdat->lru_lock, flags); pgdat = pagepgdat; spin_lock_irqsave(&pgdat->lru_lock, flags); |
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} |
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lruvec = mem_cgroup_page_lruvec(page, pgdat); |
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(*move_fn)(page, lruvec, arg); |
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} |
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if (pgdat) spin_unlock_irqrestore(&pgdat->lru_lock, flags); |
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release_pages(pvec->pages, pvec->nr); |
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pagevec_reinit(pvec); |
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} |
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static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec, void *arg) |
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{ int *pgmoved = arg; |
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|
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if (PageLRU(page) && !PageUnevictable(page)) { del_page_from_lru_list(page, lruvec, page_lru(page)); ClearPageActive(page); add_page_to_lru_list_tail(page, lruvec, page_lru(page)); |
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(*pgmoved)++; } } /* * pagevec_move_tail() must be called with IRQ disabled. * Otherwise this may cause nasty races. */ static void pagevec_move_tail(struct pagevec *pvec) { int pgmoved = 0; pagevec_lru_move_fn(pvec, pagevec_move_tail_fn, &pgmoved); __count_vm_events(PGROTATED, pgmoved); } |
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/* |
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* Writeback is about to end against a page which has been marked for immediate * reclaim. If it still appears to be reclaimable, move it to the tail of the |
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* inactive list. |
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*/ |
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void rotate_reclaimable_page(struct page *page) |
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{ |
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if (!PageLocked(page) && !PageDirty(page) && |
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!PageUnevictable(page) && PageLRU(page)) { |
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struct pagevec *pvec; unsigned long flags; |
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get_page(page); |
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local_irq_save(flags); |
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pvec = this_cpu_ptr(&lru_rotate_pvecs); |
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if (!pagevec_add(pvec, page) || PageCompound(page)) |
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pagevec_move_tail(pvec); local_irq_restore(flags); } |
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} |
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static void update_page_reclaim_stat(struct lruvec *lruvec, |
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int file, int rotated) { |
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struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat; |
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reclaim_stat->recent_scanned[file]++; if (rotated) reclaim_stat->recent_rotated[file]++; |
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} |
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static void __activate_page(struct page *page, struct lruvec *lruvec, void *arg) |
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{ |
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if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { |
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int file = page_is_file_cache(page); int lru = page_lru_base_type(page); |
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|
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del_page_from_lru_list(page, lruvec, lru); |
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SetPageActive(page); lru += LRU_ACTIVE; |
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add_page_to_lru_list(page, lruvec, lru); |
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trace_mm_lru_activate(page); |
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|
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__count_vm_event(PGACTIVATE); update_page_reclaim_stat(lruvec, file, 1); |
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} |
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} #ifdef CONFIG_SMP |
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static void activate_page_drain(int cpu) { struct pagevec *pvec = &per_cpu(activate_page_pvecs, cpu); if (pagevec_count(pvec)) pagevec_lru_move_fn(pvec, __activate_page, NULL); } |
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static bool need_activate_page_drain(int cpu) { return pagevec_count(&per_cpu(activate_page_pvecs, cpu)) != 0; } |
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void activate_page(struct page *page) { |
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page = compound_head(page); |
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if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { struct pagevec *pvec = &get_cpu_var(activate_page_pvecs); |
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get_page(page); |
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if (!pagevec_add(pvec, page) || PageCompound(page)) |
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pagevec_lru_move_fn(pvec, __activate_page, NULL); put_cpu_var(activate_page_pvecs); } } #else static inline void activate_page_drain(int cpu) { } void activate_page(struct page *page) { struct zone *zone = page_zone(page); |
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page = compound_head(page); |
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spin_lock_irq(zone_lru_lock(zone)); |
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__activate_page(page, mem_cgroup_page_lruvec(page, zone->zone_pgdat), NULL); |
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spin_unlock_irq(zone_lru_lock(zone)); |
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} |
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#endif |
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|
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static void __lru_cache_activate_page(struct page *page) { struct pagevec *pvec = &get_cpu_var(lru_add_pvec); int i; /* * Search backwards on the optimistic assumption that the page being * activated has just been added to this pagevec. Note that only * the local pagevec is examined as a !PageLRU page could be in the * process of being released, reclaimed, migrated or on a remote * pagevec that is currently being drained. Furthermore, marking * a remote pagevec's page PageActive potentially hits a race where * a page is marked PageActive just after it is added to the inactive * list causing accounting errors and BUG_ON checks to trigger. */ for (i = pagevec_count(pvec) - 1; i >= 0; i--) { struct page *pagevec_page = pvec->pages[i]; if (pagevec_page == page) { SetPageActive(page); break; } } put_cpu_var(lru_add_pvec); } |
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/* * Mark a page as having seen activity. * * inactive,unreferenced -> inactive,referenced * inactive,referenced -> active,unreferenced * active,unreferenced -> active,referenced |
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* * When a newly allocated page is not yet visible, so safe for non-atomic ops, * __SetPageReferenced(page) may be substituted for mark_page_accessed(page). |
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*/ |
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void mark_page_accessed(struct page *page) |
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{ |
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page = compound_head(page); |
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if (!PageActive(page) && !PageUnevictable(page) && |
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PageReferenced(page)) { /* * If the page is on the LRU, queue it for activation via * activate_page_pvecs. Otherwise, assume the page is on a * pagevec, mark it active and it'll be moved to the active * LRU on the next drain. */ if (PageLRU(page)) activate_page(page); else __lru_cache_activate_page(page); |
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ClearPageReferenced(page); |
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if (page_is_file_cache(page)) workingset_activation(page); |
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} else if (!PageReferenced(page)) { SetPageReferenced(page); } |
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if (page_is_idle(page)) clear_page_idle(page); |
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} |
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EXPORT_SYMBOL(mark_page_accessed); |
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static void __lru_cache_add(struct page *page) |
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{ |
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struct pagevec *pvec = &get_cpu_var(lru_add_pvec); |
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get_page(page); |
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if (!pagevec_add(pvec, page) || PageCompound(page)) |
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__pagevec_lru_add(pvec); |
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put_cpu_var(lru_add_pvec); |
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} |
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/** |
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* lru_cache_add_anon - add a page to the page lists |
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* @page: the page to add */ void lru_cache_add_anon(struct page *page) { |
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if (PageActive(page)) ClearPageActive(page); |
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__lru_cache_add(page); } void lru_cache_add_file(struct page *page) { |
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if (PageActive(page)) ClearPageActive(page); |
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__lru_cache_add(page); } EXPORT_SYMBOL(lru_cache_add_file); |
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|
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/** |
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* lru_cache_add - add a page to a page list |
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* @page: the page to be added to the LRU. |
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* * Queue the page for addition to the LRU via pagevec. The decision on whether * to add the page to the [in]active [file|anon] list is deferred until the * pagevec is drained. This gives a chance for the caller of lru_cache_add() * have the page added to the active list using mark_page_accessed(). |
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*/ |
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void lru_cache_add(struct page *page) |
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{ |
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VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page); VM_BUG_ON_PAGE(PageLRU(page), page); |
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__lru_cache_add(page); |
1da177e4c Linux-2.6.12-rc2 |
421 |
} |
894bc3104 Unevictable LRU I... |
422 |
/** |
00501b531 mm: memcontrol: r... |
423 424 425 426 427 428 429 430 431 432 433 434 435 |
* lru_cache_add_active_or_unevictable * @page: the page to be added to LRU * @vma: vma in which page is mapped for determining reclaimability * * Place @page on the active or unevictable LRU list, depending on its * evictability. Note that if the page is not evictable, it goes * directly back onto it's zone's unevictable list, it does NOT use a * per cpu pagevec. */ void lru_cache_add_active_or_unevictable(struct page *page, struct vm_area_struct *vma) { VM_BUG_ON_PAGE(PageLRU(page), page); |
9c4e6b1a7 mm, mlock, vmscan... |
436 |
if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) |
00501b531 mm: memcontrol: r... |
437 |
SetPageActive(page); |
9c4e6b1a7 mm, mlock, vmscan... |
438 |
else if (!TestSetPageMlocked(page)) { |
00501b531 mm: memcontrol: r... |
439 440 441 442 443 444 445 446 447 |
/* * We use the irq-unsafe __mod_zone_page_stat because this * counter is not modified from interrupt context, and the pte * lock is held(spinlock), which implies preemption disabled. */ __mod_zone_page_state(page_zone(page), NR_MLOCK, hpage_nr_pages(page)); count_vm_event(UNEVICTABLE_PGMLOCKED); } |
9c4e6b1a7 mm, mlock, vmscan... |
448 |
lru_cache_add(page); |
00501b531 mm: memcontrol: r... |
449 |
} |
902aaed0d mm: use pagevec t... |
450 |
/* |
315601809 mm: deactivate in... |
451 452 453 454 455 |
* If the page can not be invalidated, it is moved to the * inactive list to speed up its reclaim. It is moved to the * head of the list, rather than the tail, to give the flusher * threads some time to write it out, as this is much more * effective than the single-page writeout from reclaim. |
278df9f45 mm: reclaim inval... |
456 457 458 459 460 461 462 463 464 465 466 467 468 469 |
* * If the page isn't page_mapped and dirty/writeback, the page * could reclaim asap using PG_reclaim. * * 1. active, mapped page -> none * 2. active, dirty/writeback page -> inactive, head, PG_reclaim * 3. inactive, mapped page -> none * 4. inactive, dirty/writeback page -> inactive, head, PG_reclaim * 5. inactive, clean -> inactive, tail * 6. Others -> none * * In 4, why it moves inactive's head, the VM expects the page would * be write it out by flusher threads as this is much more effective * than the single-page writeout from reclaim. |
315601809 mm: deactivate in... |
470 |
*/ |
cc5993bd7 mm: rename deacti... |
471 |
static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec, |
fa9add641 mm/memcg: apply a... |
472 |
void *arg) |
315601809 mm: deactivate in... |
473 474 |
{ int lru, file; |
278df9f45 mm: reclaim inval... |
475 |
bool active; |
315601809 mm: deactivate in... |
476 |
|
278df9f45 mm: reclaim inval... |
477 |
if (!PageLRU(page)) |
315601809 mm: deactivate in... |
478 |
return; |
bad49d9c8 mm: check PageUne... |
479 480 |
if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
481 482 483 |
/* Some processes are using the page */ if (page_mapped(page)) return; |
278df9f45 mm: reclaim inval... |
484 |
active = PageActive(page); |
315601809 mm: deactivate in... |
485 486 |
file = page_is_file_cache(page); lru = page_lru_base_type(page); |
fa9add641 mm/memcg: apply a... |
487 488 |
del_page_from_lru_list(page, lruvec, lru + active); |
315601809 mm: deactivate in... |
489 490 |
ClearPageActive(page); ClearPageReferenced(page); |
fa9add641 mm/memcg: apply a... |
491 |
add_page_to_lru_list(page, lruvec, lru); |
315601809 mm: deactivate in... |
492 |
|
278df9f45 mm: reclaim inval... |
493 494 495 496 497 498 499 500 501 502 503 504 |
if (PageWriteback(page) || PageDirty(page)) { /* * PG_reclaim could be raced with end_page_writeback * It can make readahead confusing. But race window * is _really_ small and it's non-critical problem. */ SetPageReclaim(page); } else { /* * The page's writeback ends up during pagevec * We moves tha page into tail of inactive. */ |
925b7673c mm: make per-memc... |
505 |
list_move_tail(&page->lru, &lruvec->lists[lru]); |
278df9f45 mm: reclaim inval... |
506 507 508 509 510 |
__count_vm_event(PGROTATED); } if (active) __count_vm_event(PGDEACTIVATE); |
fa9add641 mm/memcg: apply a... |
511 |
update_page_reclaim_stat(lruvec, file, 0); |
315601809 mm: deactivate in... |
512 |
} |
10853a039 mm: move lazily f... |
513 |
|
f7ad2a6cb mm: move MADV_FRE... |
514 |
static void lru_lazyfree_fn(struct page *page, struct lruvec *lruvec, |
10853a039 mm: move lazily f... |
515 516 |
void *arg) { |
f7ad2a6cb mm: move MADV_FRE... |
517 |
if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) && |
24c92eb7d mm: avoid marking... |
518 |
!PageSwapCache(page) && !PageUnevictable(page)) { |
f7ad2a6cb mm: move MADV_FRE... |
519 |
bool active = PageActive(page); |
10853a039 mm: move lazily f... |
520 |
|
f7ad2a6cb mm: move MADV_FRE... |
521 522 |
del_page_from_lru_list(page, lruvec, LRU_INACTIVE_ANON + active); |
10853a039 mm: move lazily f... |
523 524 |
ClearPageActive(page); ClearPageReferenced(page); |
f7ad2a6cb mm: move MADV_FRE... |
525 526 527 528 529 530 531 |
/* * lazyfree pages are clean anonymous pages. They have * SwapBacked flag cleared to distinguish normal anonymous * pages */ ClearPageSwapBacked(page); add_page_to_lru_list(page, lruvec, LRU_INACTIVE_FILE); |
10853a039 mm: move lazily f... |
532 |
|
f7ad2a6cb mm: move MADV_FRE... |
533 |
__count_vm_events(PGLAZYFREE, hpage_nr_pages(page)); |
2262185c5 mm: per-cgroup me... |
534 |
count_memcg_page_event(page, PGLAZYFREE); |
f7ad2a6cb mm: move MADV_FRE... |
535 |
update_page_reclaim_stat(lruvec, 1, 0); |
10853a039 mm: move lazily f... |
536 537 |
} } |
315601809 mm: deactivate in... |
538 |
/* |
902aaed0d mm: use pagevec t... |
539 540 541 542 |
* Drain pages out of the cpu's pagevecs. * Either "cpu" is the current CPU, and preemption has already been * disabled; or "cpu" is being hot-unplugged, and is already dead. */ |
f0cb3c76a mm: drain percpu ... |
543 |
void lru_add_drain_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
544 |
{ |
13f7f7898 mm: pagevec: defe... |
545 |
struct pagevec *pvec = &per_cpu(lru_add_pvec, cpu); |
1da177e4c Linux-2.6.12-rc2 |
546 |
|
13f7f7898 mm: pagevec: defe... |
547 |
if (pagevec_count(pvec)) |
a0b8cab3b mm: remove lru pa... |
548 |
__pagevec_lru_add(pvec); |
902aaed0d mm: use pagevec t... |
549 550 551 552 553 554 555 556 557 558 |
pvec = &per_cpu(lru_rotate_pvecs, cpu); if (pagevec_count(pvec)) { unsigned long flags; /* No harm done if a racing interrupt already did this */ local_irq_save(flags); pagevec_move_tail(pvec); local_irq_restore(flags); } |
315601809 mm: deactivate in... |
559 |
|
cc5993bd7 mm: rename deacti... |
560 |
pvec = &per_cpu(lru_deactivate_file_pvecs, cpu); |
315601809 mm: deactivate in... |
561 |
if (pagevec_count(pvec)) |
cc5993bd7 mm: rename deacti... |
562 |
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); |
eb709b0d0 mm: batch activat... |
563 |
|
f7ad2a6cb mm: move MADV_FRE... |
564 |
pvec = &per_cpu(lru_lazyfree_pvecs, cpu); |
10853a039 mm: move lazily f... |
565 |
if (pagevec_count(pvec)) |
f7ad2a6cb mm: move MADV_FRE... |
566 |
pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL); |
10853a039 mm: move lazily f... |
567 |
|
eb709b0d0 mm: batch activat... |
568 |
activate_page_drain(cpu); |
315601809 mm: deactivate in... |
569 570 571 |
} /** |
cc5993bd7 mm: rename deacti... |
572 |
* deactivate_file_page - forcefully deactivate a file page |
315601809 mm: deactivate in... |
573 574 575 576 577 578 |
* @page: page to deactivate * * This function hints the VM that @page is a good reclaim candidate, * for example if its invalidation fails due to the page being dirty * or under writeback. */ |
cc5993bd7 mm: rename deacti... |
579 |
void deactivate_file_page(struct page *page) |
315601809 mm: deactivate in... |
580 |
{ |
821ed6bbe mm: filter unevic... |
581 |
/* |
cc5993bd7 mm: rename deacti... |
582 583 |
* In a workload with many unevictable page such as mprotect, * unevictable page deactivation for accelerating reclaim is pointless. |
821ed6bbe mm: filter unevic... |
584 585 586 |
*/ if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
587 |
if (likely(get_page_unless_zero(page))) { |
cc5993bd7 mm: rename deacti... |
588 |
struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs); |
315601809 mm: deactivate in... |
589 |
|
8f182270d mm/swap.c: flush ... |
590 |
if (!pagevec_add(pvec, page) || PageCompound(page)) |
cc5993bd7 mm: rename deacti... |
591 592 |
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); put_cpu_var(lru_deactivate_file_pvecs); |
315601809 mm: deactivate in... |
593 |
} |
80bfed904 [PATCH] consolida... |
594 |
} |
10853a039 mm: move lazily f... |
595 |
/** |
f7ad2a6cb mm: move MADV_FRE... |
596 |
* mark_page_lazyfree - make an anon page lazyfree |
10853a039 mm: move lazily f... |
597 598 |
* @page: page to deactivate * |
f7ad2a6cb mm: move MADV_FRE... |
599 600 |
* mark_page_lazyfree() moves @page to the inactive file list. * This is done to accelerate the reclaim of @page. |
10853a039 mm: move lazily f... |
601 |
*/ |
f7ad2a6cb mm: move MADV_FRE... |
602 |
void mark_page_lazyfree(struct page *page) |
10853a039 mm: move lazily f... |
603 |
{ |
f7ad2a6cb mm: move MADV_FRE... |
604 |
if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) && |
24c92eb7d mm: avoid marking... |
605 |
!PageSwapCache(page) && !PageUnevictable(page)) { |
f7ad2a6cb mm: move MADV_FRE... |
606 |
struct pagevec *pvec = &get_cpu_var(lru_lazyfree_pvecs); |
10853a039 mm: move lazily f... |
607 |
|
09cbfeaf1 mm, fs: get rid o... |
608 |
get_page(page); |
8f182270d mm/swap.c: flush ... |
609 |
if (!pagevec_add(pvec, page) || PageCompound(page)) |
f7ad2a6cb mm: move MADV_FRE... |
610 611 |
pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL); put_cpu_var(lru_lazyfree_pvecs); |
10853a039 mm: move lazily f... |
612 613 |
} } |
80bfed904 [PATCH] consolida... |
614 615 |
void lru_add_drain(void) { |
f0cb3c76a mm: drain percpu ... |
616 |
lru_add_drain_cpu(get_cpu()); |
80bfed904 [PATCH] consolida... |
617 |
put_cpu(); |
1da177e4c Linux-2.6.12-rc2 |
618 |
} |
e6e9d6e29 mm: handle lru_ad... |
619 620 621 |
#ifdef CONFIG_SMP static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work); |
c4028958b WorkStruct: make ... |
622 |
static void lru_add_drain_per_cpu(struct work_struct *dummy) |
053837fce [PATCH] mm: migra... |
623 624 625 |
{ lru_add_drain(); } |
9852a7212 mm: drop hotplug ... |
626 627 628 629 630 631 632 633 |
/* * Doesn't need any cpu hotplug locking because we do rely on per-cpu * kworkers being shut down before our page_alloc_cpu_dead callback is * executed on the offlined cpu. * Calling this function with cpu hotplug locks held can actually lead * to obscure indirect dependencies via WQ context. */ void lru_add_drain_all(void) |
053837fce [PATCH] mm: migra... |
634 |
{ |
5fbc46163 mm: make lru_add_... |
635 636 637 |
static DEFINE_MUTEX(lock); static struct cpumask has_work; int cpu; |
ce612879d mm: move pcp and ... |
638 639 640 641 642 643 |
/* * Make sure nobody triggers this path before mm_percpu_wq is fully * initialized. */ if (WARN_ON(!mm_percpu_wq)) return; |
5fbc46163 mm: make lru_add_... |
644 |
mutex_lock(&lock); |
5fbc46163 mm: make lru_add_... |
645 646 647 648 649 650 651 |
cpumask_clear(&has_work); for_each_online_cpu(cpu) { struct work_struct *work = &per_cpu(lru_add_drain_work, cpu); if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) || pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) || |
cc5993bd7 mm: rename deacti... |
652 |
pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) || |
f7ad2a6cb mm: move MADV_FRE... |
653 |
pagevec_count(&per_cpu(lru_lazyfree_pvecs, cpu)) || |
5fbc46163 mm: make lru_add_... |
654 655 |
need_activate_page_drain(cpu)) { INIT_WORK(work, lru_add_drain_per_cpu); |
ce612879d mm: move pcp and ... |
656 |
queue_work_on(cpu, mm_percpu_wq, work); |
5fbc46163 mm: make lru_add_... |
657 658 659 660 661 662 |
cpumask_set_cpu(cpu, &has_work); } } for_each_cpu(cpu, &has_work) flush_work(&per_cpu(lru_add_drain_work, cpu)); |
5fbc46163 mm: make lru_add_... |
663 |
mutex_unlock(&lock); |
053837fce [PATCH] mm: migra... |
664 |
} |
e6e9d6e29 mm: handle lru_ad... |
665 666 667 668 669 670 |
#else void lru_add_drain_all(void) { lru_add_drain(); } #endif |
053837fce [PATCH] mm: migra... |
671 |
|
aabfb5729 mm: memcontrol: d... |
672 |
/** |
ea1754a08 mm, fs: remove re... |
673 |
* release_pages - batched put_page() |
aabfb5729 mm: memcontrol: d... |
674 675 |
* @pages: array of pages to release * @nr: number of pages |
1da177e4c Linux-2.6.12-rc2 |
676 |
* |
aabfb5729 mm: memcontrol: d... |
677 678 |
* Decrement the reference count on all the pages in @pages. If it * fell to zero, remove the page from the LRU and free it. |
1da177e4c Linux-2.6.12-rc2 |
679 |
*/ |
c6f92f9fb mm: remove cold p... |
680 |
void release_pages(struct page **pages, int nr) |
1da177e4c Linux-2.6.12-rc2 |
681 682 |
{ int i; |
cc59850ef mm: add free_hot_... |
683 |
LIST_HEAD(pages_to_free); |
599d0c954 mm, vmscan: move ... |
684 |
struct pglist_data *locked_pgdat = NULL; |
fa9add641 mm/memcg: apply a... |
685 |
struct lruvec *lruvec; |
902aaed0d mm: use pagevec t... |
686 |
unsigned long uninitialized_var(flags); |
aabfb5729 mm: memcontrol: d... |
687 |
unsigned int uninitialized_var(lock_batch); |
1da177e4c Linux-2.6.12-rc2 |
688 |
|
1da177e4c Linux-2.6.12-rc2 |
689 690 |
for (i = 0; i < nr; i++) { struct page *page = pages[i]; |
1da177e4c Linux-2.6.12-rc2 |
691 |
|
aabfb5729 mm: memcontrol: d... |
692 693 694 |
/* * Make sure the IRQ-safe lock-holding time does not get * excessive with a continuous string of pages from the |
599d0c954 mm, vmscan: move ... |
695 |
* same pgdat. The lock is held only if pgdat != NULL. |
aabfb5729 mm: memcontrol: d... |
696 |
*/ |
599d0c954 mm, vmscan: move ... |
697 698 699 |
if (locked_pgdat && ++lock_batch == SWAP_CLUSTER_MAX) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; |
aabfb5729 mm: memcontrol: d... |
700 |
} |
6fcb52a56 thp: reduce usage... |
701 |
if (is_huge_zero_page(page)) |
aa88b68c3 thp: keep huge ze... |
702 |
continue; |
aa88b68c3 thp: keep huge ze... |
703 |
|
df6ad6983 mm/device-public-... |
704 705 706 707 708 709 710 |
/* Device public page can not be huge page */ if (is_device_public_page(page)) { if (locked_pgdat) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; } |
e76384884 mm: introduce MEM... |
711 |
put_devmap_managed_page(page); |
df6ad6983 mm/device-public-... |
712 713 |
continue; } |
ddc58f27f mm: drop tail pag... |
714 |
page = compound_head(page); |
b5810039a [PATCH] core remo... |
715 |
if (!put_page_testzero(page)) |
1da177e4c Linux-2.6.12-rc2 |
716 |
continue; |
ddc58f27f mm: drop tail pag... |
717 |
if (PageCompound(page)) { |
599d0c954 mm, vmscan: move ... |
718 719 720 |
if (locked_pgdat) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; |
ddc58f27f mm: drop tail pag... |
721 722 723 724 |
} __put_compound_page(page); continue; } |
46453a6e1 [PATCH] mm: never... |
725 |
if (PageLRU(page)) { |
599d0c954 mm, vmscan: move ... |
726 |
struct pglist_data *pgdat = page_pgdat(page); |
894bc3104 Unevictable LRU I... |
727 |
|
599d0c954 mm, vmscan: move ... |
728 729 730 |
if (pgdat != locked_pgdat) { if (locked_pgdat) spin_unlock_irqrestore(&locked_pgdat->lru_lock, |
902aaed0d mm: use pagevec t... |
731 |
flags); |
aabfb5729 mm: memcontrol: d... |
732 |
lock_batch = 0; |
599d0c954 mm, vmscan: move ... |
733 734 |
locked_pgdat = pgdat; spin_lock_irqsave(&locked_pgdat->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
735 |
} |
fa9add641 mm/memcg: apply a... |
736 |
|
599d0c954 mm, vmscan: move ... |
737 |
lruvec = mem_cgroup_page_lruvec(page, locked_pgdat); |
309381fea mm: dump page whe... |
738 |
VM_BUG_ON_PAGE(!PageLRU(page), page); |
674539115 [PATCH] mm: less ... |
739 |
__ClearPageLRU(page); |
fa9add641 mm/memcg: apply a... |
740 |
del_page_from_lru_list(page, lruvec, page_off_lru(page)); |
46453a6e1 [PATCH] mm: never... |
741 |
} |
c53954a09 mm: remove lru pa... |
742 |
/* Clear Active bit in case of parallel mark_page_accessed */ |
e3741b506 mm: do not use at... |
743 |
__ClearPageActive(page); |
629060270 mm: add PageWaite... |
744 |
__ClearPageWaiters(page); |
c53954a09 mm: remove lru pa... |
745 |
|
cc59850ef mm: add free_hot_... |
746 |
list_add(&page->lru, &pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
747 |
} |
599d0c954 mm, vmscan: move ... |
748 749 |
if (locked_pgdat) spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
750 |
|
747db954c mm: memcontrol: u... |
751 |
mem_cgroup_uncharge_list(&pages_to_free); |
2d4894b5d mm: remove cold p... |
752 |
free_unref_page_list(&pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
753 |
} |
0be8557bc fuse: use release... |
754 |
EXPORT_SYMBOL(release_pages); |
1da177e4c Linux-2.6.12-rc2 |
755 756 757 758 759 760 761 762 763 764 765 766 767 |
/* * The pages which we're about to release may be in the deferred lru-addition * queues. That would prevent them from really being freed right now. That's * OK from a correctness point of view but is inefficient - those pages may be * cache-warm and we want to give them back to the page allocator ASAP. * * So __pagevec_release() will drain those queues here. __pagevec_lru_add() * and __pagevec_lru_add_active() call release_pages() directly to avoid * mutual recursion. */ void __pagevec_release(struct pagevec *pvec) { |
7f0b5fb95 mm, pagevec: rena... |
768 |
if (!pvec->percpu_pvec_drained) { |
d9ed0d08b mm: only drain pe... |
769 |
lru_add_drain(); |
7f0b5fb95 mm, pagevec: rena... |
770 |
pvec->percpu_pvec_drained = true; |
d9ed0d08b mm: only drain pe... |
771 |
} |
c6f92f9fb mm: remove cold p... |
772 |
release_pages(pvec->pages, pagevec_count(pvec)); |
1da177e4c Linux-2.6.12-rc2 |
773 774 |
pagevec_reinit(pvec); } |
7f2857018 Export __pagevec_... |
775 |
EXPORT_SYMBOL(__pagevec_release); |
12d271078 memcg: fix split_... |
776 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
71e3aac07 thp: transparent ... |
777 |
/* used by __split_huge_page_refcount() */ |
fa9add641 mm/memcg: apply a... |
778 |
void lru_add_page_tail(struct page *page, struct page *page_tail, |
5bc7b8aca mm: thp: add spli... |
779 |
struct lruvec *lruvec, struct list_head *list) |
71e3aac07 thp: transparent ... |
780 |
{ |
71e3aac07 thp: transparent ... |
781 |
const int file = 0; |
71e3aac07 thp: transparent ... |
782 |
|
309381fea mm: dump page whe... |
783 784 785 |
VM_BUG_ON_PAGE(!PageHead(page), page); VM_BUG_ON_PAGE(PageCompound(page_tail), page); VM_BUG_ON_PAGE(PageLRU(page_tail), page); |
fa9add641 mm/memcg: apply a... |
786 |
VM_BUG_ON(NR_CPUS != 1 && |
599d0c954 mm, vmscan: move ... |
787 |
!spin_is_locked(&lruvec_pgdat(lruvec)->lru_lock)); |
71e3aac07 thp: transparent ... |
788 |
|
5bc7b8aca mm: thp: add spli... |
789 790 |
if (!list) SetPageLRU(page_tail); |
71e3aac07 thp: transparent ... |
791 |
|
12d271078 memcg: fix split_... |
792 793 |
if (likely(PageLRU(page))) list_add_tail(&page_tail->lru, &page->lru); |
5bc7b8aca mm: thp: add spli... |
794 795 796 797 798 |
else if (list) { /* page reclaim is reclaiming a huge page */ get_page(page_tail); list_add_tail(&page_tail->lru, list); } else { |
12d271078 memcg: fix split_... |
799 800 801 802 803 804 805 806 |
struct list_head *list_head; /* * Head page has not yet been counted, as an hpage, * so we must account for each subpage individually. * * Use the standard add function to put page_tail on the list, * but then correct its position so they all end up in order. */ |
e180cf806 thp, mm: avoid Pa... |
807 |
add_page_to_lru_list(page_tail, lruvec, page_lru(page_tail)); |
12d271078 memcg: fix split_... |
808 809 |
list_head = page_tail->lru.prev; list_move_tail(&page_tail->lru, list_head); |
71e3aac07 thp: transparent ... |
810 |
} |
7512102cf memcg: fix GPF wh... |
811 812 |
if (!PageUnevictable(page)) |
e180cf806 thp, mm: avoid Pa... |
813 |
update_page_reclaim_stat(lruvec, file, PageActive(page_tail)); |
71e3aac07 thp: transparent ... |
814 |
} |
12d271078 memcg: fix split_... |
815 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
71e3aac07 thp: transparent ... |
816 |
|
fa9add641 mm/memcg: apply a... |
817 818 |
static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec, void *arg) |
3dd7ae8ec mm: simplify code... |
819 |
{ |
9c4e6b1a7 mm, mlock, vmscan... |
820 821 |
enum lru_list lru; int was_unevictable = TestClearPageUnevictable(page); |
3dd7ae8ec mm: simplify code... |
822 |
|
309381fea mm: dump page whe... |
823 |
VM_BUG_ON_PAGE(PageLRU(page), page); |
3dd7ae8ec mm: simplify code... |
824 825 |
SetPageLRU(page); |
9c4e6b1a7 mm, mlock, vmscan... |
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 |
/* * Page becomes evictable in two ways: * 1) Within LRU lock [munlock_vma_pages() and __munlock_pagevec()]. * 2) Before acquiring LRU lock to put the page to correct LRU and then * a) do PageLRU check with lock [check_move_unevictable_pages] * b) do PageLRU check before lock [clear_page_mlock] * * (1) & (2a) are ok as LRU lock will serialize them. For (2b), we need * following strict ordering: * * #0: __pagevec_lru_add_fn #1: clear_page_mlock * * SetPageLRU() TestClearPageMlocked() * smp_mb() // explicit ordering // above provides strict * // ordering * PageMlocked() PageLRU() * * * if '#1' does not observe setting of PG_lru by '#0' and fails * isolation, the explicit barrier will make sure that page_evictable * check will put the page in correct LRU. Without smp_mb(), SetPageLRU * can be reordered after PageMlocked check and can make '#1' to fail * the isolation of the page whose Mlocked bit is cleared (#0 is also * looking at the same page) and the evictable page will be stranded * in an unevictable LRU. */ smp_mb(); if (page_evictable(page)) { lru = page_lru(page); update_page_reclaim_stat(lruvec, page_is_file_cache(page), PageActive(page)); if (was_unevictable) count_vm_event(UNEVICTABLE_PGRESCUED); } else { lru = LRU_UNEVICTABLE; ClearPageActive(page); SetPageUnevictable(page); if (!was_unevictable) count_vm_event(UNEVICTABLE_PGCULLED); } |
fa9add641 mm/memcg: apply a... |
867 |
add_page_to_lru_list(page, lruvec, lru); |
24b7e5819 mm: pagemap: avoi... |
868 |
trace_mm_lru_insertion(page, lru); |
3dd7ae8ec mm: simplify code... |
869 |
} |
1da177e4c Linux-2.6.12-rc2 |
870 |
/* |
1da177e4c Linux-2.6.12-rc2 |
871 872 873 |
* Add the passed pages to the LRU, then drop the caller's refcount * on them. Reinitialises the caller's pagevec. */ |
a0b8cab3b mm: remove lru pa... |
874 |
void __pagevec_lru_add(struct pagevec *pvec) |
1da177e4c Linux-2.6.12-rc2 |
875 |
{ |
a0b8cab3b mm: remove lru pa... |
876 |
pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, NULL); |
1da177e4c Linux-2.6.12-rc2 |
877 |
} |
5095ae837 mm: fewer undersc... |
878 |
EXPORT_SYMBOL(__pagevec_lru_add); |
1da177e4c Linux-2.6.12-rc2 |
879 |
|
1da177e4c Linux-2.6.12-rc2 |
880 |
/** |
0cd6144aa mm + fs: prepare ... |
881 882 883 884 |
* pagevec_lookup_entries - gang pagecache lookup * @pvec: Where the resulting entries are placed * @mapping: The address_space to search * @start: The starting entry index |
cb6f0f348 mm/swap.c: make f... |
885 |
* @nr_entries: The maximum number of pages |
0cd6144aa mm + fs: prepare ... |
886 887 888 |
* @indices: The cache indices corresponding to the entries in @pvec * * pagevec_lookup_entries() will search for and return a group of up |
f144c390f mm: docs: fix par... |
889 |
* to @nr_pages pages and shadow entries in the mapping. All |
0cd6144aa mm + fs: prepare ... |
890 891 892 893 894 895 896 897 898 899 900 901 |
* entries are placed in @pvec. pagevec_lookup_entries() takes a * reference against actual pages in @pvec. * * The search returns a group of mapping-contiguous entries with * ascending indexes. There may be holes in the indices due to * not-present entries. * * pagevec_lookup_entries() returns the number of entries which were * found. */ unsigned pagevec_lookup_entries(struct pagevec *pvec, struct address_space *mapping, |
e02a9f048 mm/swap.c: make f... |
902 |
pgoff_t start, unsigned nr_entries, |
0cd6144aa mm + fs: prepare ... |
903 904 |
pgoff_t *indices) { |
e02a9f048 mm/swap.c: make f... |
905 |
pvec->nr = find_get_entries(mapping, start, nr_entries, |
0cd6144aa mm + fs: prepare ... |
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 |
pvec->pages, indices); return pagevec_count(pvec); } /** * pagevec_remove_exceptionals - pagevec exceptionals pruning * @pvec: The pagevec to prune * * pagevec_lookup_entries() fills both pages and exceptional radix * tree entries into the pagevec. This function prunes all * exceptionals from @pvec without leaving holes, so that it can be * passed on to page-only pagevec operations. */ void pagevec_remove_exceptionals(struct pagevec *pvec) { int i, j; for (i = 0, j = 0; i < pagevec_count(pvec); i++) { struct page *page = pvec->pages[i]; if (!radix_tree_exceptional_entry(page)) pvec->pages[j++] = page; } pvec->nr = j; } /** |
b947cee4b mm: implement fin... |
932 |
* pagevec_lookup_range - gang pagecache lookup |
1da177e4c Linux-2.6.12-rc2 |
933 934 935 |
* @pvec: Where the resulting pages are placed * @mapping: The address_space to search * @start: The starting page index |
b947cee4b mm: implement fin... |
936 |
* @end: The final page index |
1da177e4c Linux-2.6.12-rc2 |
937 |
* |
e02a9f048 mm/swap.c: make f... |
938 |
* pagevec_lookup_range() will search for & return a group of up to PAGEVEC_SIZE |
b947cee4b mm: implement fin... |
939 940 |
* pages in the mapping starting from index @start and upto index @end * (inclusive). The pages are placed in @pvec. pagevec_lookup() takes a |
1da177e4c Linux-2.6.12-rc2 |
941 942 943 |
* reference against the pages in @pvec. * * The search returns a group of mapping-contiguous pages with ascending |
d72dc8a25 mm: make pagevec_... |
944 945 |
* indexes. There may be holes in the indices due to not-present pages. We * also update @start to index the next page for the traversal. |
1da177e4c Linux-2.6.12-rc2 |
946 |
* |
b947cee4b mm: implement fin... |
947 |
* pagevec_lookup_range() returns the number of pages which were found. If this |
e02a9f048 mm/swap.c: make f... |
948 |
* number is smaller than PAGEVEC_SIZE, the end of specified range has been |
b947cee4b mm: implement fin... |
949 |
* reached. |
1da177e4c Linux-2.6.12-rc2 |
950 |
*/ |
b947cee4b mm: implement fin... |
951 |
unsigned pagevec_lookup_range(struct pagevec *pvec, |
397162ffa mm: remove nr_pag... |
952 |
struct address_space *mapping, pgoff_t *start, pgoff_t end) |
1da177e4c Linux-2.6.12-rc2 |
953 |
{ |
397162ffa mm: remove nr_pag... |
954 |
pvec->nr = find_get_pages_range(mapping, start, end, PAGEVEC_SIZE, |
b947cee4b mm: implement fin... |
955 |
pvec->pages); |
1da177e4c Linux-2.6.12-rc2 |
956 957 |
return pagevec_count(pvec); } |
b947cee4b mm: implement fin... |
958 |
EXPORT_SYMBOL(pagevec_lookup_range); |
78539fdfa [XFS] Export page... |
959 |
|
72b045aec mm: implement fin... |
960 961 |
unsigned pagevec_lookup_range_tag(struct pagevec *pvec, struct address_space *mapping, pgoff_t *index, pgoff_t end, |
67fd707f4 mm: remove nr_pag... |
962 |
int tag) |
1da177e4c Linux-2.6.12-rc2 |
963 |
{ |
72b045aec mm: implement fin... |
964 |
pvec->nr = find_get_pages_range_tag(mapping, index, end, tag, |
67fd707f4 mm: remove nr_pag... |
965 |
PAGEVEC_SIZE, pvec->pages); |
1da177e4c Linux-2.6.12-rc2 |
966 967 |
return pagevec_count(pvec); } |
72b045aec mm: implement fin... |
968 |
EXPORT_SYMBOL(pagevec_lookup_range_tag); |
1da177e4c Linux-2.6.12-rc2 |
969 |
|
93d3b7140 mm: add variant o... |
970 971 972 973 974 975 976 977 978 |
unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec, struct address_space *mapping, pgoff_t *index, pgoff_t end, int tag, unsigned max_pages) { pvec->nr = find_get_pages_range_tag(mapping, index, end, tag, min_t(unsigned int, max_pages, PAGEVEC_SIZE), pvec->pages); return pagevec_count(pvec); } EXPORT_SYMBOL(pagevec_lookup_range_nr_tag); |
1da177e4c Linux-2.6.12-rc2 |
979 980 981 982 983 |
/* * Perform any setup for the swap system */ void __init swap_setup(void) { |
4481374ce mm: replace vario... |
984 |
unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT); |
e0bf68dde mm: bdi init hooks |
985 |
|
1da177e4c Linux-2.6.12-rc2 |
986 987 988 989 990 991 992 993 994 |
/* Use a smaller cluster for small-memory machines */ if (megs < 16) page_cluster = 2; else page_cluster = 3; /* * Right now other parts of the system means that we * _really_ don't want to cluster much more */ |
1da177e4c Linux-2.6.12-rc2 |
995 |
} |