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mm/swap.c
29.9 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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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 |
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* Documentation/admin-guide/sysctl/vm.rst. |
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* 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/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_deactivate_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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pg_data_t *pgdat = page_pgdat(page); |
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struct lruvec *lruvec; unsigned long flags; |
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|
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spin_lock_irqsave(&pgdat->lru_lock, flags); lruvec = mem_cgroup_page_lruvec(page, 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(&pgdat->lru_lock, flags); |
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} |
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__ClearPageWaiters(page); |
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} static void __put_single_page(struct page *page) { __page_cache_release(page); |
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mem_cgroup_uncharge(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; |
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victim = lru_to_page(pages); |
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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) { |
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pg_data_t *pgdat = page_pgdat(page); |
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|
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page = compound_head(page); |
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spin_lock_irq(&pgdat->lru_lock); __activate_page(page, mem_cgroup_page_lruvec(page, pgdat), NULL); spin_unlock_irq(&pgdat->lru_lock); |
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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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418 |
{ |
309381fea mm: dump page whe... |
419 420 |
VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page); VM_BUG_ON_PAGE(PageLRU(page), page); |
c53954a09 mm: remove lru pa... |
421 |
__lru_cache_add(page); |
1da177e4c Linux-2.6.12-rc2 |
422 |
} |
894bc3104 Unevictable LRU I... |
423 |
/** |
00501b531 mm: memcontrol: r... |
424 425 426 427 428 429 430 431 432 433 434 435 436 |
* 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... |
437 |
if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) |
00501b531 mm: memcontrol: r... |
438 |
SetPageActive(page); |
9c4e6b1a7 mm, mlock, vmscan... |
439 |
else if (!TestSetPageMlocked(page)) { |
00501b531 mm: memcontrol: r... |
440 441 442 443 444 445 446 447 448 |
/* * 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... |
449 |
lru_cache_add(page); |
00501b531 mm: memcontrol: r... |
450 |
} |
902aaed0d mm: use pagevec t... |
451 |
/* |
315601809 mm: deactivate in... |
452 453 454 455 456 |
* 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... |
457 458 459 460 461 462 463 464 465 466 467 468 469 470 |
* * 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... |
471 |
*/ |
cc5993bd7 mm: rename deacti... |
472 |
static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec, |
fa9add641 mm/memcg: apply a... |
473 |
void *arg) |
315601809 mm: deactivate in... |
474 475 |
{ int lru, file; |
278df9f45 mm: reclaim inval... |
476 |
bool active; |
315601809 mm: deactivate in... |
477 |
|
278df9f45 mm: reclaim inval... |
478 |
if (!PageLRU(page)) |
315601809 mm: deactivate in... |
479 |
return; |
bad49d9c8 mm: check PageUne... |
480 481 |
if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
482 483 484 |
/* Some processes are using the page */ if (page_mapped(page)) return; |
278df9f45 mm: reclaim inval... |
485 |
active = PageActive(page); |
315601809 mm: deactivate in... |
486 487 |
file = page_is_file_cache(page); lru = page_lru_base_type(page); |
fa9add641 mm/memcg: apply a... |
488 489 |
del_page_from_lru_list(page, lruvec, lru + active); |
315601809 mm: deactivate in... |
490 491 |
ClearPageActive(page); ClearPageReferenced(page); |
315601809 mm: deactivate in... |
492 |
|
278df9f45 mm: reclaim inval... |
493 494 495 496 497 498 |
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. */ |
e7a1aaf28 mm: replace list_... |
499 |
add_page_to_lru_list(page, lruvec, lru); |
278df9f45 mm: reclaim inval... |
500 501 502 503 504 505 |
SetPageReclaim(page); } else { /* * The page's writeback ends up during pagevec * We moves tha page into tail of inactive. */ |
e7a1aaf28 mm: replace list_... |
506 |
add_page_to_lru_list_tail(page, lruvec, lru); |
278df9f45 mm: reclaim inval... |
507 508 509 510 511 |
__count_vm_event(PGROTATED); } if (active) __count_vm_event(PGDEACTIVATE); |
fa9add641 mm/memcg: apply a... |
512 |
update_page_reclaim_stat(lruvec, file, 0); |
315601809 mm: deactivate in... |
513 |
} |
9c276cc65 mm: introduce MAD... |
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 |
static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec, void *arg) { if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) { int file = page_is_file_cache(page); int lru = page_lru_base_type(page); del_page_from_lru_list(page, lruvec, lru + LRU_ACTIVE); ClearPageActive(page); ClearPageReferenced(page); add_page_to_lru_list(page, lruvec, lru); __count_vm_events(PGDEACTIVATE, hpage_nr_pages(page)); update_page_reclaim_stat(lruvec, file, 0); } } |
10853a039 mm: move lazily f... |
530 |
|
f7ad2a6cb mm: move MADV_FRE... |
531 |
static void lru_lazyfree_fn(struct page *page, struct lruvec *lruvec, |
10853a039 mm: move lazily f... |
532 533 |
void *arg) { |
f7ad2a6cb mm: move MADV_FRE... |
534 |
if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) && |
24c92eb7d mm: avoid marking... |
535 |
!PageSwapCache(page) && !PageUnevictable(page)) { |
f7ad2a6cb mm: move MADV_FRE... |
536 |
bool active = PageActive(page); |
10853a039 mm: move lazily f... |
537 |
|
f7ad2a6cb mm: move MADV_FRE... |
538 539 |
del_page_from_lru_list(page, lruvec, LRU_INACTIVE_ANON + active); |
10853a039 mm: move lazily f... |
540 541 |
ClearPageActive(page); ClearPageReferenced(page); |
f7ad2a6cb mm: move MADV_FRE... |
542 543 544 545 546 547 548 |
/* * 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... |
549 |
|
f7ad2a6cb mm: move MADV_FRE... |
550 |
__count_vm_events(PGLAZYFREE, hpage_nr_pages(page)); |
2262185c5 mm: per-cgroup me... |
551 |
count_memcg_page_event(page, PGLAZYFREE); |
f7ad2a6cb mm: move MADV_FRE... |
552 |
update_page_reclaim_stat(lruvec, 1, 0); |
10853a039 mm: move lazily f... |
553 554 |
} } |
315601809 mm: deactivate in... |
555 |
/* |
902aaed0d mm: use pagevec t... |
556 557 558 559 |
* 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 ... |
560 |
void lru_add_drain_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
561 |
{ |
13f7f7898 mm: pagevec: defe... |
562 |
struct pagevec *pvec = &per_cpu(lru_add_pvec, cpu); |
1da177e4c Linux-2.6.12-rc2 |
563 |
|
13f7f7898 mm: pagevec: defe... |
564 |
if (pagevec_count(pvec)) |
a0b8cab3b mm: remove lru pa... |
565 |
__pagevec_lru_add(pvec); |
902aaed0d mm: use pagevec t... |
566 567 568 569 570 571 572 573 574 575 |
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... |
576 |
|
cc5993bd7 mm: rename deacti... |
577 |
pvec = &per_cpu(lru_deactivate_file_pvecs, cpu); |
315601809 mm: deactivate in... |
578 |
if (pagevec_count(pvec)) |
cc5993bd7 mm: rename deacti... |
579 |
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); |
eb709b0d0 mm: batch activat... |
580 |
|
9c276cc65 mm: introduce MAD... |
581 582 583 |
pvec = &per_cpu(lru_deactivate_pvecs, cpu); if (pagevec_count(pvec)) pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
f7ad2a6cb mm: move MADV_FRE... |
584 |
pvec = &per_cpu(lru_lazyfree_pvecs, cpu); |
10853a039 mm: move lazily f... |
585 |
if (pagevec_count(pvec)) |
f7ad2a6cb mm: move MADV_FRE... |
586 |
pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL); |
10853a039 mm: move lazily f... |
587 |
|
eb709b0d0 mm: batch activat... |
588 |
activate_page_drain(cpu); |
315601809 mm: deactivate in... |
589 590 591 |
} /** |
cc5993bd7 mm: rename deacti... |
592 |
* deactivate_file_page - forcefully deactivate a file page |
315601809 mm: deactivate in... |
593 594 595 596 597 598 |
* @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... |
599 |
void deactivate_file_page(struct page *page) |
315601809 mm: deactivate in... |
600 |
{ |
821ed6bbe mm: filter unevic... |
601 |
/* |
cc5993bd7 mm: rename deacti... |
602 603 |
* In a workload with many unevictable page such as mprotect, * unevictable page deactivation for accelerating reclaim is pointless. |
821ed6bbe mm: filter unevic... |
604 605 606 |
*/ if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
607 |
if (likely(get_page_unless_zero(page))) { |
cc5993bd7 mm: rename deacti... |
608 |
struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs); |
315601809 mm: deactivate in... |
609 |
|
8f182270d mm/swap.c: flush ... |
610 |
if (!pagevec_add(pvec, page) || PageCompound(page)) |
cc5993bd7 mm: rename deacti... |
611 612 |
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); put_cpu_var(lru_deactivate_file_pvecs); |
315601809 mm: deactivate in... |
613 |
} |
80bfed904 [PATCH] consolida... |
614 |
} |
9c276cc65 mm: introduce MAD... |
615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 |
/* * deactivate_page - deactivate a page * @page: page to deactivate * * deactivate_page() moves @page to the inactive list if @page was on the active * list and was not an unevictable page. This is done to accelerate the reclaim * of @page. */ void deactivate_page(struct page *page) { if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) { struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs); get_page(page); if (!pagevec_add(pvec, page) || PageCompound(page)) pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); put_cpu_var(lru_deactivate_pvecs); } } |
10853a039 mm: move lazily f... |
634 |
/** |
f7ad2a6cb mm: move MADV_FRE... |
635 |
* mark_page_lazyfree - make an anon page lazyfree |
10853a039 mm: move lazily f... |
636 637 |
* @page: page to deactivate * |
f7ad2a6cb mm: move MADV_FRE... |
638 639 |
* mark_page_lazyfree() moves @page to the inactive file list. * This is done to accelerate the reclaim of @page. |
10853a039 mm: move lazily f... |
640 |
*/ |
f7ad2a6cb mm: move MADV_FRE... |
641 |
void mark_page_lazyfree(struct page *page) |
10853a039 mm: move lazily f... |
642 |
{ |
f7ad2a6cb mm: move MADV_FRE... |
643 |
if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) && |
24c92eb7d mm: avoid marking... |
644 |
!PageSwapCache(page) && !PageUnevictable(page)) { |
f7ad2a6cb mm: move MADV_FRE... |
645 |
struct pagevec *pvec = &get_cpu_var(lru_lazyfree_pvecs); |
10853a039 mm: move lazily f... |
646 |
|
09cbfeaf1 mm, fs: get rid o... |
647 |
get_page(page); |
8f182270d mm/swap.c: flush ... |
648 |
if (!pagevec_add(pvec, page) || PageCompound(page)) |
f7ad2a6cb mm: move MADV_FRE... |
649 650 |
pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL); put_cpu_var(lru_lazyfree_pvecs); |
10853a039 mm: move lazily f... |
651 652 |
} } |
80bfed904 [PATCH] consolida... |
653 654 |
void lru_add_drain(void) { |
f0cb3c76a mm: drain percpu ... |
655 |
lru_add_drain_cpu(get_cpu()); |
80bfed904 [PATCH] consolida... |
656 |
put_cpu(); |
1da177e4c Linux-2.6.12-rc2 |
657 |
} |
6ea183d60 mm: handle lru_ad... |
658 659 660 |
#ifdef CONFIG_SMP static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work); |
c4028958b WorkStruct: make ... |
661 |
static void lru_add_drain_per_cpu(struct work_struct *dummy) |
053837fce [PATCH] mm: migra... |
662 663 664 |
{ lru_add_drain(); } |
9852a7212 mm: drop hotplug ... |
665 666 667 668 669 670 671 672 |
/* * 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... |
673 |
{ |
5fbc46163 mm: make lru_add_... |
674 675 676 |
static DEFINE_MUTEX(lock); static struct cpumask has_work; int cpu; |
ce612879d mm: move pcp and ... |
677 678 679 680 681 682 |
/* * 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_... |
683 |
mutex_lock(&lock); |
5fbc46163 mm: make lru_add_... |
684 685 686 687 688 689 690 |
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... |
691 |
pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) || |
9c276cc65 mm: introduce MAD... |
692 |
pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) || |
f7ad2a6cb mm: move MADV_FRE... |
693 |
pagevec_count(&per_cpu(lru_lazyfree_pvecs, cpu)) || |
5fbc46163 mm: make lru_add_... |
694 695 |
need_activate_page_drain(cpu)) { INIT_WORK(work, lru_add_drain_per_cpu); |
ce612879d mm: move pcp and ... |
696 |
queue_work_on(cpu, mm_percpu_wq, work); |
5fbc46163 mm: make lru_add_... |
697 698 699 700 701 702 |
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_... |
703 |
mutex_unlock(&lock); |
053837fce [PATCH] mm: migra... |
704 |
} |
6ea183d60 mm: handle lru_ad... |
705 706 707 708 709 710 |
#else void lru_add_drain_all(void) { lru_add_drain(); } #endif |
053837fce [PATCH] mm: migra... |
711 |
|
aabfb5729 mm: memcontrol: d... |
712 |
/** |
ea1754a08 mm, fs: remove re... |
713 |
* release_pages - batched put_page() |
aabfb5729 mm: memcontrol: d... |
714 715 |
* @pages: array of pages to release * @nr: number of pages |
1da177e4c Linux-2.6.12-rc2 |
716 |
* |
aabfb5729 mm: memcontrol: d... |
717 718 |
* 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 |
719 |
*/ |
c6f92f9fb mm: remove cold p... |
720 |
void release_pages(struct page **pages, int nr) |
1da177e4c Linux-2.6.12-rc2 |
721 722 |
{ int i; |
cc59850ef mm: add free_hot_... |
723 |
LIST_HEAD(pages_to_free); |
599d0c954 mm, vmscan: move ... |
724 |
struct pglist_data *locked_pgdat = NULL; |
fa9add641 mm/memcg: apply a... |
725 |
struct lruvec *lruvec; |
902aaed0d mm: use pagevec t... |
726 |
unsigned long uninitialized_var(flags); |
aabfb5729 mm: memcontrol: d... |
727 |
unsigned int uninitialized_var(lock_batch); |
1da177e4c Linux-2.6.12-rc2 |
728 |
|
1da177e4c Linux-2.6.12-rc2 |
729 730 |
for (i = 0; i < nr; i++) { struct page *page = pages[i]; |
1da177e4c Linux-2.6.12-rc2 |
731 |
|
aabfb5729 mm: memcontrol: d... |
732 733 734 |
/* * Make sure the IRQ-safe lock-holding time does not get * excessive with a continuous string of pages from the |
599d0c954 mm, vmscan: move ... |
735 |
* same pgdat. The lock is held only if pgdat != NULL. |
aabfb5729 mm: memcontrol: d... |
736 |
*/ |
599d0c954 mm, vmscan: move ... |
737 738 739 |
if (locked_pgdat && ++lock_batch == SWAP_CLUSTER_MAX) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; |
aabfb5729 mm: memcontrol: d... |
740 |
} |
6fcb52a56 thp: reduce usage... |
741 |
if (is_huge_zero_page(page)) |
aa88b68c3 thp: keep huge ze... |
742 |
continue; |
aa88b68c3 thp: keep huge ze... |
743 |
|
c5d6c45e9 mm/swap: fix rele... |
744 |
if (is_zone_device_page(page)) { |
df6ad6983 mm/device-public-... |
745 746 747 748 749 |
if (locked_pgdat) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; } |
c5d6c45e9 mm/swap: fix rele... |
750 751 752 753 754 755 756 757 |
/* * ZONE_DEVICE pages that return 'false' from * put_devmap_managed_page() do not require special * processing, and instead, expect a call to * put_page_testzero(). */ if (put_devmap_managed_page(page)) continue; |
df6ad6983 mm/device-public-... |
758 |
} |
ddc58f27f mm: drop tail pag... |
759 |
page = compound_head(page); |
b5810039a [PATCH] core remo... |
760 |
if (!put_page_testzero(page)) |
1da177e4c Linux-2.6.12-rc2 |
761 |
continue; |
ddc58f27f mm: drop tail pag... |
762 |
if (PageCompound(page)) { |
599d0c954 mm, vmscan: move ... |
763 764 765 |
if (locked_pgdat) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; |
ddc58f27f mm: drop tail pag... |
766 767 768 769 |
} __put_compound_page(page); continue; } |
46453a6e1 [PATCH] mm: never... |
770 |
if (PageLRU(page)) { |
599d0c954 mm, vmscan: move ... |
771 |
struct pglist_data *pgdat = page_pgdat(page); |
894bc3104 Unevictable LRU I... |
772 |
|
599d0c954 mm, vmscan: move ... |
773 774 775 |
if (pgdat != locked_pgdat) { if (locked_pgdat) spin_unlock_irqrestore(&locked_pgdat->lru_lock, |
902aaed0d mm: use pagevec t... |
776 |
flags); |
aabfb5729 mm: memcontrol: d... |
777 |
lock_batch = 0; |
599d0c954 mm, vmscan: move ... |
778 779 |
locked_pgdat = pgdat; spin_lock_irqsave(&locked_pgdat->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
780 |
} |
fa9add641 mm/memcg: apply a... |
781 |
|
599d0c954 mm, vmscan: move ... |
782 |
lruvec = mem_cgroup_page_lruvec(page, locked_pgdat); |
309381fea mm: dump page whe... |
783 |
VM_BUG_ON_PAGE(!PageLRU(page), page); |
674539115 [PATCH] mm: less ... |
784 |
__ClearPageLRU(page); |
fa9add641 mm/memcg: apply a... |
785 |
del_page_from_lru_list(page, lruvec, page_off_lru(page)); |
46453a6e1 [PATCH] mm: never... |
786 |
} |
c53954a09 mm: remove lru pa... |
787 |
/* Clear Active bit in case of parallel mark_page_accessed */ |
e3741b506 mm: do not use at... |
788 |
__ClearPageActive(page); |
629060270 mm: add PageWaite... |
789 |
__ClearPageWaiters(page); |
c53954a09 mm: remove lru pa... |
790 |
|
cc59850ef mm: add free_hot_... |
791 |
list_add(&page->lru, &pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
792 |
} |
599d0c954 mm, vmscan: move ... |
793 794 |
if (locked_pgdat) spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
795 |
|
747db954c mm: memcontrol: u... |
796 |
mem_cgroup_uncharge_list(&pages_to_free); |
2d4894b5d mm: remove cold p... |
797 |
free_unref_page_list(&pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
798 |
} |
0be8557bc fuse: use release... |
799 |
EXPORT_SYMBOL(release_pages); |
1da177e4c Linux-2.6.12-rc2 |
800 801 802 803 804 805 806 807 808 809 810 811 812 |
/* * 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) { |
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if (!pvec->percpu_pvec_drained) { |
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lru_add_drain(); |
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pvec->percpu_pvec_drained = true; |
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} |
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release_pages(pvec->pages, pagevec_count(pvec)); |
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pagevec_reinit(pvec); } |
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EXPORT_SYMBOL(__pagevec_release); |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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/* used by __split_huge_page_refcount() */ |
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void lru_add_page_tail(struct page *page, struct page *page_tail, |
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struct lruvec *lruvec, struct list_head *list) |
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{ |
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const int file = 0; |
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|
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VM_BUG_ON_PAGE(!PageHead(page), page); VM_BUG_ON_PAGE(PageCompound(page_tail), page); VM_BUG_ON_PAGE(PageLRU(page_tail), page); |
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lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock); |
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|
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if (!list) SetPageLRU(page_tail); |
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|
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if (likely(PageLRU(page))) list_add_tail(&page_tail->lru, &page->lru); |
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else if (list) { /* page reclaim is reclaiming a huge page */ get_page(page_tail); list_add_tail(&page_tail->lru, list); } else { |
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/* * Head page has not yet been counted, as an hpage, * so we must account for each subpage individually. * |
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* Put page_tail on the list at the correct position * so they all end up in order. |
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*/ |
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add_page_to_lru_list_tail(page_tail, lruvec, page_lru(page_tail)); |
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} |
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if (!PageUnevictable(page)) |
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update_page_reclaim_stat(lruvec, file, PageActive(page_tail)); |
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} |
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
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|
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static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec, void *arg) |
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{ |
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enum lru_list lru; int was_unevictable = TestClearPageUnevictable(page); |
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|
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VM_BUG_ON_PAGE(PageLRU(page), page); |
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SetPageLRU(page); |
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/* * Page becomes evictable in two ways: |
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* 1) Within LRU lock [munlock_vma_page() and __munlock_pagevec()]. |
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* 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); } |
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add_page_to_lru_list(page, lruvec, lru); |
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trace_mm_lru_insertion(page, lru); |
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} |
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/* |
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* Add the passed pages to the LRU, then drop the caller's refcount * on them. Reinitialises the caller's pagevec. */ |
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void __pagevec_lru_add(struct pagevec *pvec) |
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{ |
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pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, NULL); |
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} |
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EXPORT_SYMBOL(__pagevec_lru_add); |
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|
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/** |
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* pagevec_lookup_entries - gang pagecache lookup * @pvec: Where the resulting entries are placed * @mapping: The address_space to search * @start: The starting entry index |
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* @nr_entries: The maximum number of pages |
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* @indices: The cache indices corresponding to the entries in @pvec * * pagevec_lookup_entries() will search for and return a group of up |
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* to @nr_pages pages and shadow entries in the mapping. All |
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* 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, |
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pgoff_t start, unsigned nr_entries, |
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pgoff_t *indices) { |
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pvec->nr = find_get_entries(mapping, start, nr_entries, |
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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]; |
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if (!xa_is_value(page)) |
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pvec->pages[j++] = page; } pvec->nr = j; } /** |
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* pagevec_lookup_range - gang pagecache lookup |
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* @pvec: Where the resulting pages are placed * @mapping: The address_space to search * @start: The starting page index |
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* @end: The final page index |
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* |
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* pagevec_lookup_range() will search for & return a group of up to PAGEVEC_SIZE |
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* pages in the mapping starting from index @start and upto index @end * (inclusive). The pages are placed in @pvec. pagevec_lookup() takes a |
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* reference against the pages in @pvec. * * The search returns a group of mapping-contiguous pages with ascending |
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* 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. |
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* |
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* pagevec_lookup_range() returns the number of pages which were found. If this |
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* number is smaller than PAGEVEC_SIZE, the end of specified range has been |
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* reached. |
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*/ |
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unsigned pagevec_lookup_range(struct pagevec *pvec, |
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struct address_space *mapping, pgoff_t *start, pgoff_t end) |
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{ |
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pvec->nr = find_get_pages_range(mapping, start, end, PAGEVEC_SIZE, |
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pvec->pages); |
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return pagevec_count(pvec); } |
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EXPORT_SYMBOL(pagevec_lookup_range); |
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|
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unsigned pagevec_lookup_range_tag(struct pagevec *pvec, struct address_space *mapping, pgoff_t *index, pgoff_t end, |
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xa_mark_t tag) |
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{ |
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pvec->nr = find_get_pages_range_tag(mapping, index, end, tag, |
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PAGEVEC_SIZE, pvec->pages); |
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return pagevec_count(pvec); } |
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EXPORT_SYMBOL(pagevec_lookup_range_tag); |
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|
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unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec, struct address_space *mapping, pgoff_t *index, pgoff_t end, |
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xa_mark_t tag, unsigned max_pages) |
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{ 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); |
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/* * Perform any setup for the swap system */ void __init swap_setup(void) { |
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unsigned long megs = totalram_pages() >> (20 - PAGE_SHIFT); |
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|
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/* 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 */ |
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} |