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mm/swap.c
27 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/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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#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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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_hot_cold_page(page, false); |
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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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{ 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, pvec->cold); 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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if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { enum lru_list lru = page_lru_base_type(page); |
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list_move_tail(&page->lru, &lruvec->lists[lru]); |
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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) && !PageActive(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) { } |
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static bool need_activate_page_drain(int cpu) { return false; } |
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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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/** * lru_cache_add: add a page to the page lists * @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); |
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} |
894bc3104 Unevictable LRU I... |
413 414 415 416 417 418 419 420 421 422 423 424 |
/** * add_page_to_unevictable_list - add a page to the unevictable list * @page: the page to be added to the unevictable list * * Add page directly to its zone's unevictable list. To avoid races with * tasks that might be making the page evictable, through eg. munlock, * munmap or exit, while it's not on the lru, we want to add the page * while it's locked or otherwise "invisible" to other tasks. This is * difficult to do when using the pagevec cache, so bypass that. */ void add_page_to_unevictable_list(struct page *page) { |
599d0c954 mm, vmscan: move ... |
425 |
struct pglist_data *pgdat = page_pgdat(page); |
fa9add641 mm/memcg: apply a... |
426 |
struct lruvec *lruvec; |
894bc3104 Unevictable LRU I... |
427 |
|
599d0c954 mm, vmscan: move ... |
428 429 |
spin_lock_irq(&pgdat->lru_lock); lruvec = mem_cgroup_page_lruvec(page, pgdat); |
ef2a2cbdd mm/swap.c: clear ... |
430 |
ClearPageActive(page); |
894bc3104 Unevictable LRU I... |
431 432 |
SetPageUnevictable(page); SetPageLRU(page); |
fa9add641 mm/memcg: apply a... |
433 |
add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE); |
599d0c954 mm, vmscan: move ... |
434 |
spin_unlock_irq(&pgdat->lru_lock); |
894bc3104 Unevictable LRU I... |
435 |
} |
00501b531 mm: memcontrol: r... |
436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 |
/** * 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); if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) { SetPageActive(page); lru_cache_add(page); return; } if (!TestSetPageMlocked(page)) { /* * 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); } add_page_to_unevictable_list(page); } |
902aaed0d mm: use pagevec t... |
469 |
/* |
315601809 mm: deactivate in... |
470 471 472 473 474 |
* 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... |
475 476 477 478 479 480 481 482 483 484 485 486 487 488 |
* * 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... |
489 |
*/ |
cc5993bd7 mm: rename deacti... |
490 |
static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec, |
fa9add641 mm/memcg: apply a... |
491 |
void *arg) |
315601809 mm: deactivate in... |
492 493 |
{ int lru, file; |
278df9f45 mm: reclaim inval... |
494 |
bool active; |
315601809 mm: deactivate in... |
495 |
|
278df9f45 mm: reclaim inval... |
496 |
if (!PageLRU(page)) |
315601809 mm: deactivate in... |
497 |
return; |
bad49d9c8 mm: check PageUne... |
498 499 |
if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
500 501 502 |
/* Some processes are using the page */ if (page_mapped(page)) return; |
278df9f45 mm: reclaim inval... |
503 |
active = PageActive(page); |
315601809 mm: deactivate in... |
504 505 |
file = page_is_file_cache(page); lru = page_lru_base_type(page); |
fa9add641 mm/memcg: apply a... |
506 507 |
del_page_from_lru_list(page, lruvec, lru + active); |
315601809 mm: deactivate in... |
508 509 |
ClearPageActive(page); ClearPageReferenced(page); |
fa9add641 mm/memcg: apply a... |
510 |
add_page_to_lru_list(page, lruvec, lru); |
315601809 mm: deactivate in... |
511 |
|
278df9f45 mm: reclaim inval... |
512 513 514 515 516 517 518 519 520 521 522 523 |
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... |
524 |
list_move_tail(&page->lru, &lruvec->lists[lru]); |
278df9f45 mm: reclaim inval... |
525 526 527 528 529 |
__count_vm_event(PGROTATED); } if (active) __count_vm_event(PGDEACTIVATE); |
fa9add641 mm/memcg: apply a... |
530 |
update_page_reclaim_stat(lruvec, file, 0); |
315601809 mm: deactivate in... |
531 |
} |
10853a039 mm: move lazily f... |
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 |
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_event(PGDEACTIVATE); update_page_reclaim_stat(lruvec, file, 0); } } |
315601809 mm: deactivate in... |
549 |
/* |
902aaed0d mm: use pagevec t... |
550 551 552 553 |
* 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 ... |
554 |
void lru_add_drain_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
555 |
{ |
13f7f7898 mm: pagevec: defe... |
556 |
struct pagevec *pvec = &per_cpu(lru_add_pvec, cpu); |
1da177e4c Linux-2.6.12-rc2 |
557 |
|
13f7f7898 mm: pagevec: defe... |
558 |
if (pagevec_count(pvec)) |
a0b8cab3b mm: remove lru pa... |
559 |
__pagevec_lru_add(pvec); |
902aaed0d mm: use pagevec t... |
560 561 562 563 564 565 566 567 568 569 |
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... |
570 |
|
cc5993bd7 mm: rename deacti... |
571 |
pvec = &per_cpu(lru_deactivate_file_pvecs, cpu); |
315601809 mm: deactivate in... |
572 |
if (pagevec_count(pvec)) |
cc5993bd7 mm: rename deacti... |
573 |
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); |
eb709b0d0 mm: batch activat... |
574 |
|
10853a039 mm: move lazily f... |
575 576 577 |
pvec = &per_cpu(lru_deactivate_pvecs, cpu); if (pagevec_count(pvec)) pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
eb709b0d0 mm: batch activat... |
578 |
activate_page_drain(cpu); |
315601809 mm: deactivate in... |
579 580 581 |
} /** |
cc5993bd7 mm: rename deacti... |
582 |
* deactivate_file_page - forcefully deactivate a file page |
315601809 mm: deactivate in... |
583 584 585 586 587 588 |
* @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... |
589 |
void deactivate_file_page(struct page *page) |
315601809 mm: deactivate in... |
590 |
{ |
821ed6bbe mm: filter unevic... |
591 |
/* |
cc5993bd7 mm: rename deacti... |
592 593 |
* In a workload with many unevictable page such as mprotect, * unevictable page deactivation for accelerating reclaim is pointless. |
821ed6bbe mm: filter unevic... |
594 595 596 |
*/ if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
597 |
if (likely(get_page_unless_zero(page))) { |
cc5993bd7 mm: rename deacti... |
598 |
struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs); |
315601809 mm: deactivate in... |
599 |
|
8f182270d mm/swap.c: flush ... |
600 |
if (!pagevec_add(pvec, page) || PageCompound(page)) |
cc5993bd7 mm: rename deacti... |
601 602 |
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); put_cpu_var(lru_deactivate_file_pvecs); |
315601809 mm: deactivate in... |
603 |
} |
80bfed904 [PATCH] consolida... |
604 |
} |
10853a039 mm: move lazily f... |
605 606 607 608 609 610 611 612 613 614 615 616 |
/** * 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); |
09cbfeaf1 mm, fs: get rid o... |
617 |
get_page(page); |
8f182270d mm/swap.c: flush ... |
618 |
if (!pagevec_add(pvec, page) || PageCompound(page)) |
10853a039 mm: move lazily f... |
619 620 621 622 |
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); put_cpu_var(lru_deactivate_pvecs); } } |
80bfed904 [PATCH] consolida... |
623 624 |
void lru_add_drain(void) { |
f0cb3c76a mm: drain percpu ... |
625 |
lru_add_drain_cpu(get_cpu()); |
80bfed904 [PATCH] consolida... |
626 |
put_cpu(); |
1da177e4c Linux-2.6.12-rc2 |
627 |
} |
c4028958b WorkStruct: make ... |
628 |
static void lru_add_drain_per_cpu(struct work_struct *dummy) |
053837fce [PATCH] mm: migra... |
629 630 631 |
{ lru_add_drain(); } |
5fbc46163 mm: make lru_add_... |
632 |
static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work); |
f3a932baa mm: introduce ded... |
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 |
/* * lru_add_drain_wq is used to do lru_add_drain_all() from a WQ_MEM_RECLAIM * workqueue, aiding in getting memory freed. */ static struct workqueue_struct *lru_add_drain_wq; static int __init lru_init(void) { lru_add_drain_wq = alloc_workqueue("lru-add-drain", WQ_MEM_RECLAIM, 0); if (WARN(!lru_add_drain_wq, "Failed to create workqueue lru_add_drain_wq")) return -ENOMEM; return 0; } early_initcall(lru_init); |
5fbc46163 mm: make lru_add_... |
650 |
void lru_add_drain_all(void) |
053837fce [PATCH] mm: migra... |
651 |
{ |
5fbc46163 mm: make lru_add_... |
652 653 654 655 656 657 658 659 660 661 662 663 664 |
static DEFINE_MUTEX(lock); static struct cpumask has_work; int cpu; mutex_lock(&lock); get_online_cpus(); 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... |
665 |
pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) || |
10853a039 mm: move lazily f... |
666 |
pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) || |
5fbc46163 mm: make lru_add_... |
667 668 |
need_activate_page_drain(cpu)) { INIT_WORK(work, lru_add_drain_per_cpu); |
f3a932baa mm: introduce ded... |
669 |
queue_work_on(cpu, lru_add_drain_wq, work); |
5fbc46163 mm: make lru_add_... |
670 671 672 673 674 675 676 677 678 |
cpumask_set_cpu(cpu, &has_work); } } for_each_cpu(cpu, &has_work) flush_work(&per_cpu(lru_add_drain_work, cpu)); put_online_cpus(); mutex_unlock(&lock); |
053837fce [PATCH] mm: migra... |
679 |
} |
aabfb5729 mm: memcontrol: d... |
680 |
/** |
ea1754a08 mm, fs: remove re... |
681 |
* release_pages - batched put_page() |
aabfb5729 mm: memcontrol: d... |
682 683 684 |
* @pages: array of pages to release * @nr: number of pages * @cold: whether the pages are cache cold |
1da177e4c Linux-2.6.12-rc2 |
685 |
* |
aabfb5729 mm: memcontrol: d... |
686 687 |
* 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 |
688 |
*/ |
b745bc85f mm: page_alloc: c... |
689 |
void release_pages(struct page **pages, int nr, bool cold) |
1da177e4c Linux-2.6.12-rc2 |
690 691 |
{ int i; |
cc59850ef mm: add free_hot_... |
692 |
LIST_HEAD(pages_to_free); |
599d0c954 mm, vmscan: move ... |
693 |
struct pglist_data *locked_pgdat = NULL; |
fa9add641 mm/memcg: apply a... |
694 |
struct lruvec *lruvec; |
902aaed0d mm: use pagevec t... |
695 |
unsigned long uninitialized_var(flags); |
aabfb5729 mm: memcontrol: d... |
696 |
unsigned int uninitialized_var(lock_batch); |
1da177e4c Linux-2.6.12-rc2 |
697 |
|
1da177e4c Linux-2.6.12-rc2 |
698 699 |
for (i = 0; i < nr; i++) { struct page *page = pages[i]; |
1da177e4c Linux-2.6.12-rc2 |
700 |
|
aabfb5729 mm: memcontrol: d... |
701 702 703 |
/* * Make sure the IRQ-safe lock-holding time does not get * excessive with a continuous string of pages from the |
599d0c954 mm, vmscan: move ... |
704 |
* same pgdat. The lock is held only if pgdat != NULL. |
aabfb5729 mm: memcontrol: d... |
705 |
*/ |
599d0c954 mm, vmscan: move ... |
706 707 708 |
if (locked_pgdat && ++lock_batch == SWAP_CLUSTER_MAX) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; |
aabfb5729 mm: memcontrol: d... |
709 |
} |
6fcb52a56 thp: reduce usage... |
710 |
if (is_huge_zero_page(page)) |
aa88b68c3 thp: keep huge ze... |
711 |
continue; |
aa88b68c3 thp: keep huge ze... |
712 |
|
ddc58f27f mm: drop tail pag... |
713 |
page = compound_head(page); |
b5810039a [PATCH] core remo... |
714 |
if (!put_page_testzero(page)) |
1da177e4c Linux-2.6.12-rc2 |
715 |
continue; |
ddc58f27f mm: drop tail pag... |
716 |
if (PageCompound(page)) { |
599d0c954 mm, vmscan: move ... |
717 718 719 |
if (locked_pgdat) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; |
ddc58f27f mm: drop tail pag... |
720 721 722 723 |
} __put_compound_page(page); continue; } |
46453a6e1 [PATCH] mm: never... |
724 |
if (PageLRU(page)) { |
599d0c954 mm, vmscan: move ... |
725 |
struct pglist_data *pgdat = page_pgdat(page); |
894bc3104 Unevictable LRU I... |
726 |
|
599d0c954 mm, vmscan: move ... |
727 728 729 |
if (pgdat != locked_pgdat) { if (locked_pgdat) spin_unlock_irqrestore(&locked_pgdat->lru_lock, |
902aaed0d mm: use pagevec t... |
730 |
flags); |
aabfb5729 mm: memcontrol: d... |
731 |
lock_batch = 0; |
599d0c954 mm, vmscan: move ... |
732 733 |
locked_pgdat = pgdat; spin_lock_irqsave(&locked_pgdat->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
734 |
} |
fa9add641 mm/memcg: apply a... |
735 |
|
599d0c954 mm, vmscan: move ... |
736 |
lruvec = mem_cgroup_page_lruvec(page, locked_pgdat); |
309381fea mm: dump page whe... |
737 |
VM_BUG_ON_PAGE(!PageLRU(page), page); |
674539115 [PATCH] mm: less ... |
738 |
__ClearPageLRU(page); |
fa9add641 mm/memcg: apply a... |
739 |
del_page_from_lru_list(page, lruvec, page_off_lru(page)); |
46453a6e1 [PATCH] mm: never... |
740 |
} |
c53954a09 mm: remove lru pa... |
741 |
/* Clear Active bit in case of parallel mark_page_accessed */ |
e3741b506 mm: do not use at... |
742 |
__ClearPageActive(page); |
c53954a09 mm: remove lru pa... |
743 |
|
cc59850ef mm: add free_hot_... |
744 |
list_add(&page->lru, &pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
745 |
} |
599d0c954 mm, vmscan: move ... |
746 747 |
if (locked_pgdat) spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
748 |
|
747db954c mm: memcontrol: u... |
749 |
mem_cgroup_uncharge_list(&pages_to_free); |
cc59850ef mm: add free_hot_... |
750 |
free_hot_cold_page_list(&pages_to_free, cold); |
1da177e4c Linux-2.6.12-rc2 |
751 |
} |
0be8557bc fuse: use release... |
752 |
EXPORT_SYMBOL(release_pages); |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 |
/* * 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) { lru_add_drain(); release_pages(pvec->pages, pagevec_count(pvec), pvec->cold); pagevec_reinit(pvec); } |
7f2857018 Export __pagevec_... |
770 |
EXPORT_SYMBOL(__pagevec_release); |
12d271078 memcg: fix split_... |
771 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
71e3aac07 thp: transparent ... |
772 |
/* used by __split_huge_page_refcount() */ |
fa9add641 mm/memcg: apply a... |
773 |
void lru_add_page_tail(struct page *page, struct page *page_tail, |
5bc7b8aca mm: thp: add spli... |
774 |
struct lruvec *lruvec, struct list_head *list) |
71e3aac07 thp: transparent ... |
775 |
{ |
71e3aac07 thp: transparent ... |
776 |
const int file = 0; |
71e3aac07 thp: transparent ... |
777 |
|
309381fea mm: dump page whe... |
778 779 780 |
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... |
781 |
VM_BUG_ON(NR_CPUS != 1 && |
599d0c954 mm, vmscan: move ... |
782 |
!spin_is_locked(&lruvec_pgdat(lruvec)->lru_lock)); |
71e3aac07 thp: transparent ... |
783 |
|
5bc7b8aca mm: thp: add spli... |
784 785 |
if (!list) SetPageLRU(page_tail); |
71e3aac07 thp: transparent ... |
786 |
|
12d271078 memcg: fix split_... |
787 788 |
if (likely(PageLRU(page))) list_add_tail(&page_tail->lru, &page->lru); |
5bc7b8aca mm: thp: add spli... |
789 790 791 792 793 |
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_... |
794 795 796 797 798 799 800 801 |
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... |
802 |
add_page_to_lru_list(page_tail, lruvec, page_lru(page_tail)); |
12d271078 memcg: fix split_... |
803 804 |
list_head = page_tail->lru.prev; list_move_tail(&page_tail->lru, list_head); |
71e3aac07 thp: transparent ... |
805 |
} |
7512102cf memcg: fix GPF wh... |
806 807 |
if (!PageUnevictable(page)) |
e180cf806 thp, mm: avoid Pa... |
808 |
update_page_reclaim_stat(lruvec, file, PageActive(page_tail)); |
71e3aac07 thp: transparent ... |
809 |
} |
12d271078 memcg: fix split_... |
810 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
71e3aac07 thp: transparent ... |
811 |
|
fa9add641 mm/memcg: apply a... |
812 813 |
static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec, void *arg) |
3dd7ae8ec mm: simplify code... |
814 |
{ |
13f7f7898 mm: pagevec: defe... |
815 816 817 |
int file = page_is_file_cache(page); int active = PageActive(page); enum lru_list lru = page_lru(page); |
3dd7ae8ec mm: simplify code... |
818 |
|
309381fea mm: dump page whe... |
819 |
VM_BUG_ON_PAGE(PageLRU(page), page); |
3dd7ae8ec mm: simplify code... |
820 821 |
SetPageLRU(page); |
fa9add641 mm/memcg: apply a... |
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add_page_to_lru_list(page, lruvec, lru); update_page_reclaim_stat(lruvec, file, active); |
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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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|
1da177e4c Linux-2.6.12-rc2 |
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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 * @nr_entries: The maximum number of entries * @indices: The cache indices corresponding to the entries in @pvec * * pagevec_lookup_entries() will search for and return a group of up * to @nr_entries pages and shadow entries in the mapping. All * 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, pgoff_t start, unsigned nr_pages, pgoff_t *indices) { pvec->nr = find_get_entries(mapping, start, nr_pages, 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; } /** |
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* pagevec_lookup - gang pagecache lookup * @pvec: Where the resulting pages are placed * @mapping: The address_space to search * @start: The starting page index * @nr_pages: The maximum number of pages * * pagevec_lookup() will search for and return a group of up to @nr_pages pages * in the mapping. The pages are placed in @pvec. pagevec_lookup() takes a * reference against the pages in @pvec. * * The search returns a group of mapping-contiguous pages with ascending * indexes. There may be holes in the indices due to not-present pages. * * pagevec_lookup() returns the number of pages which were found. */ unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, pgoff_t start, unsigned nr_pages) { pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages); return pagevec_count(pvec); } |
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EXPORT_SYMBOL(pagevec_lookup); |
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unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping, pgoff_t *index, int tag, unsigned nr_pages) { pvec->nr = find_get_pages_tag(mapping, index, tag, nr_pages, pvec->pages); return pagevec_count(pvec); } |
7f2857018 Export __pagevec_... |
917 |
EXPORT_SYMBOL(pagevec_lookup_tag); |
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|
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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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#ifdef CONFIG_SWAP |
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int i; |
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for (i = 0; i < MAX_SWAPFILES; i++) |
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928 |
spin_lock_init(&swapper_spaces[i].tree_lock); |
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929 |
#endif |
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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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} |