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mm/swap.c
29.2 KB
1da177e4c Linux-2.6.12-rc2 |
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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> #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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|
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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_pvecs); |
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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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spin_lock_irqsave(&zone->lru_lock, flags); |
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lruvec = mem_cgroup_page_lruvec(page, zone); |
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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, flags); } |
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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, 0); |
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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(page); dtor = get_compound_page_dtor(page); (*dtor)(page); } static void put_compound_page(struct page *page) { |
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struct page *page_head; |
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|
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if (likely(!PageTail(page))) { if (put_page_testzero(page)) { |
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/* |
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* By the time all refcounts have been released * split_huge_page cannot run anymore from under us. |
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*/ |
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if (PageHead(page)) __put_compound_page(page); else __put_single_page(page); |
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} |
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return; } |
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|
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/* __split_huge_page_refcount can run under us */ |
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page_head = compound_head(page); |
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|
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/* * THP can not break up slab pages so avoid taking * compound_lock() and skip the tail page refcounting (in * _mapcount) too. Slab performs non-atomic bit ops on * page->flags for better performance. In particular * slab_unlock() in slub used to be a hot path. It is still * hot on arches that do not support * this_cpu_cmpxchg_double(). * * If "page" is part of a slab or hugetlbfs page it cannot be * splitted and the head page cannot change from under us. And * if "page" is part of a THP page under splitting, if the * head page pointed by the THP tail isn't a THP head anymore, * we'll find PageTail clear after smp_rmb() and we'll treat * it as a single page. */ if (!__compound_tail_refcounted(page_head)) { /* * If "page" is a THP tail, we must read the tail page * flags after the head page flags. The * split_huge_page side enforces write memory barriers * between clearing PageTail and before the head page * can be freed and reallocated. */ smp_rmb(); if (likely(PageTail(page))) { |
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/* |
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* __split_huge_page_refcount cannot race * here. |
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*/ |
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VM_BUG_ON_PAGE(!PageHead(page_head), page_head); VM_BUG_ON_PAGE(page_mapcount(page) != 0, page); |
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if (put_page_testzero(page_head)) { /* * If this is the tail of a slab * compound page, the tail pin must * not be the last reference held on * the page, because the PG_slab * cannot be cleared before all tail * pins (which skips the _mapcount * tail refcounting) have been * released. For hugetlbfs the tail * pin may be the last reference on * the page instead, because * PageHeadHuge will not go away until * the compound page enters the buddy * allocator. */ |
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VM_BUG_ON_PAGE(PageSlab(page_head), page_head); |
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__put_compound_page(page_head); |
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} |
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return; } else |
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/* |
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* __split_huge_page_refcount run before us, * "page" was a THP tail. The split page_head * has been freed and reallocated as slab or * hugetlbfs page of smaller order (only * possible if reallocated as slab on x86). |
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*/ |
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goto out_put_single; } |
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|
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if (likely(page != page_head && get_page_unless_zero(page_head))) { unsigned long flags; /* * page_head wasn't a dangling pointer but it may not * be a head page anymore by the time we obtain the * lock. That is ok as long as it can't be freed from * under us. */ flags = compound_lock_irqsave(page_head); if (unlikely(!PageTail(page))) { /* __split_huge_page_refcount run before us */ compound_unlock_irqrestore(page_head, flags); |
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if (put_page_testzero(page_head)) { |
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/* * The head page may have been freed * and reallocated as a compound page * of smaller order and then freed * again. All we know is that it * cannot have become: a THP page, a * compound page of higher order, a * tail page. That is because we * still hold the refcount of the * split THP tail and page_head was * the THP head before the split. */ |
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if (PageHead(page_head)) __put_compound_page(page_head); else __put_single_page(page_head); } |
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out_put_single: if (put_page_testzero(page)) __put_single_page(page); return; } |
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VM_BUG_ON_PAGE(page_head != page->first_page, page); |
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/* * We can release the refcount taken by * get_page_unless_zero() now that * __split_huge_page_refcount() is blocked on the * compound_lock. */ if (put_page_testzero(page_head)) |
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VM_BUG_ON_PAGE(1, page_head); |
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/* __split_huge_page_refcount will wait now */ |
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VM_BUG_ON_PAGE(page_mapcount(page) <= 0, page); |
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atomic_dec(&page->_mapcount); |
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VM_BUG_ON_PAGE(atomic_read(&page_head->_count) <= 0, page_head); VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page); |
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compound_unlock_irqrestore(page_head, flags); if (put_page_testzero(page_head)) { if (PageHead(page_head)) __put_compound_page(page_head); else __put_single_page(page_head); |
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} |
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} else { /* page_head is a dangling pointer */ |
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VM_BUG_ON_PAGE(PageTail(page), page); |
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goto out_put_single; |
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} |
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} void put_page(struct page *page) { if (unlikely(PageCompound(page))) put_compound_page(page); else if (put_page_testzero(page)) |
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__put_single_page(page); |
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} EXPORT_SYMBOL(put_page); |
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|
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/* * This function is exported but must not be called by anything other * than get_page(). It implements the slow path of get_page(). */ bool __get_page_tail(struct page *page) { /* * This takes care of get_page() if run on a tail page * returned by one of the get_user_pages/follow_page variants. * get_user_pages/follow_page itself doesn't need the compound * lock because it runs __get_page_tail_foll() under the * proper PT lock that already serializes against * split_huge_page(). */ |
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unsigned long flags; |
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bool got; |
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struct page *page_head = compound_head(page); |
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|
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/* Ref to put_compound_page() comment. */ |
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if (!__compound_tail_refcounted(page_head)) { |
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smp_rmb(); if (likely(PageTail(page))) { /* * This is a hugetlbfs page or a slab * page. __split_huge_page_refcount * cannot race here. */ |
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VM_BUG_ON_PAGE(!PageHead(page_head), page_head); |
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__get_page_tail_foll(page, true); return true; } else { /* * __split_huge_page_refcount run * before us, "page" was a THP * tail. The split page_head has been * freed and reallocated as slab or * hugetlbfs page of smaller order * (only possible if reallocated as * slab on x86). */ return false; |
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} |
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} |
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|
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got = false; if (likely(page != page_head && get_page_unless_zero(page_head))) { |
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/* * page_head wasn't a dangling pointer but it * may not be a head page anymore by the time * we obtain the lock. That is ok as long as it * can't be freed from under us. */ flags = compound_lock_irqsave(page_head); /* here __split_huge_page_refcount won't run anymore */ if (likely(PageTail(page))) { __get_page_tail_foll(page, false); got = true; |
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} |
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compound_unlock_irqrestore(page_head, flags); if (unlikely(!got)) put_page(page_head); |
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} return got; } EXPORT_SYMBOL(__get_page_tail); |
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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); page_cache_release(victim); } } 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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page_cache_get(pages[seg]); } 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 zone *zone = 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]; struct zone *pagezone = page_zone(page); if (pagezone != zone) { if (zone) |
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spin_unlock_irqrestore(&zone->lru_lock, flags); |
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zone = pagezone; |
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spin_lock_irqsave(&zone->lru_lock, flags); |
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} |
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|
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lruvec = mem_cgroup_page_lruvec(page, zone); (*move_fn)(page, lruvec, arg); |
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} if (zone) |
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spin_unlock_irqrestore(&zone->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; page_cache_get(page); local_irq_save(flags); pvec = &__get_cpu_var(lru_rotate_pvecs); if (!pagevec_add(pvec, page)) 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, page_to_pfn(page)); |
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|
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__count_vm_event(PGACTIVATE); update_page_reclaim_stat(lruvec, file, 1); |
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} |
eb709b0d0 mm: batch activat... |
465 466 467 468 469 470 471 472 473 474 475 476 |
} #ifdef CONFIG_SMP static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs); 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); } |
5fbc46163 mm: make lru_add_... |
477 478 479 480 |
static bool need_activate_page_drain(int cpu) { return pagevec_count(&per_cpu(activate_page_pvecs, cpu)) != 0; } |
eb709b0d0 mm: batch activat... |
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
void activate_page(struct page *page) { if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { struct pagevec *pvec = &get_cpu_var(activate_page_pvecs); page_cache_get(page); if (!pagevec_add(pvec, page)) pagevec_lru_move_fn(pvec, __activate_page, NULL); put_cpu_var(activate_page_pvecs); } } #else static inline void activate_page_drain(int cpu) { } |
5fbc46163 mm: make lru_add_... |
497 498 499 500 |
static bool need_activate_page_drain(int cpu) { return false; } |
eb709b0d0 mm: batch activat... |
501 502 503 504 505 |
void activate_page(struct page *page) { struct zone *zone = page_zone(page); spin_lock_irq(&zone->lru_lock); |
fa9add641 mm/memcg: apply a... |
506 |
__activate_page(page, mem_cgroup_page_lruvec(page, zone), NULL); |
1da177e4c Linux-2.6.12-rc2 |
507 508 |
spin_unlock_irq(&zone->lru_lock); } |
eb709b0d0 mm: batch activat... |
509 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
510 |
|
059285a25 mm: activate !Pag... |
511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 |
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); } |
1da177e4c Linux-2.6.12-rc2 |
537 538 539 540 541 542 543 |
/* * Mark a page as having seen activity. * * inactive,unreferenced -> inactive,referenced * inactive,referenced -> active,unreferenced * active,unreferenced -> active,referenced */ |
920c7a5d0 mm: remove fastca... |
544 |
void mark_page_accessed(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
545 |
{ |
894bc3104 Unevictable LRU I... |
546 |
if (!PageActive(page) && !PageUnevictable(page) && |
059285a25 mm: activate !Pag... |
547 548 549 550 551 552 553 554 555 556 557 558 |
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); |
1da177e4c Linux-2.6.12-rc2 |
559 |
ClearPageReferenced(page); |
a528910e1 mm: thrash detect... |
560 561 |
if (page_is_file_cache(page)) workingset_activation(page); |
1da177e4c Linux-2.6.12-rc2 |
562 563 564 565 |
} else if (!PageReferenced(page)) { SetPageReferenced(page); } } |
1da177e4c Linux-2.6.12-rc2 |
566 |
EXPORT_SYMBOL(mark_page_accessed); |
d741c9cde mm: fix nonunifor... |
567 |
/* |
13f7f7898 mm: pagevec: defe... |
568 569 570 571 |
* 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(). |
d741c9cde mm: fix nonunifor... |
572 |
*/ |
c53954a09 mm: remove lru pa... |
573 |
void __lru_cache_add(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
574 |
{ |
13f7f7898 mm: pagevec: defe... |
575 |
struct pagevec *pvec = &get_cpu_var(lru_add_pvec); |
1da177e4c Linux-2.6.12-rc2 |
576 |
page_cache_get(page); |
d741c9cde mm: fix nonunifor... |
577 |
if (!pagevec_space(pvec)) |
a0b8cab3b mm: remove lru pa... |
578 |
__pagevec_lru_add(pvec); |
d741c9cde mm: fix nonunifor... |
579 |
pagevec_add(pvec, page); |
13f7f7898 mm: pagevec: defe... |
580 |
put_cpu_var(lru_add_pvec); |
1da177e4c Linux-2.6.12-rc2 |
581 |
} |
47846b065 mm: export lru_ca... |
582 |
EXPORT_SYMBOL(__lru_cache_add); |
1da177e4c Linux-2.6.12-rc2 |
583 |
|
f04e9ebbe swap: use an arra... |
584 |
/** |
c53954a09 mm: remove lru pa... |
585 |
* lru_cache_add - add a page to a page list |
f04e9ebbe swap: use an arra... |
586 |
* @page: the page to be added to the LRU. |
f04e9ebbe swap: use an arra... |
587 |
*/ |
c53954a09 mm: remove lru pa... |
588 |
void lru_cache_add(struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
589 |
{ |
309381fea mm: dump page whe... |
590 591 |
VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page); VM_BUG_ON_PAGE(PageLRU(page), page); |
c53954a09 mm: remove lru pa... |
592 |
__lru_cache_add(page); |
1da177e4c Linux-2.6.12-rc2 |
593 |
} |
894bc3104 Unevictable LRU I... |
594 595 596 597 598 599 600 601 602 603 604 605 606 |
/** * 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) { struct zone *zone = page_zone(page); |
fa9add641 mm/memcg: apply a... |
607 |
struct lruvec *lruvec; |
894bc3104 Unevictable LRU I... |
608 609 |
spin_lock_irq(&zone->lru_lock); |
fa9add641 mm/memcg: apply a... |
610 |
lruvec = mem_cgroup_page_lruvec(page, zone); |
ef2a2cbdd mm/swap.c: clear ... |
611 |
ClearPageActive(page); |
894bc3104 Unevictable LRU I... |
612 613 |
SetPageUnevictable(page); SetPageLRU(page); |
fa9add641 mm/memcg: apply a... |
614 |
add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE); |
894bc3104 Unevictable LRU I... |
615 616 |
spin_unlock_irq(&zone->lru_lock); } |
902aaed0d mm: use pagevec t... |
617 |
/* |
315601809 mm: deactivate in... |
618 619 620 621 622 |
* 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... |
623 624 625 626 627 628 629 630 631 632 633 634 635 636 |
* * 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... |
637 |
*/ |
fa9add641 mm/memcg: apply a... |
638 639 |
static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec, void *arg) |
315601809 mm: deactivate in... |
640 641 |
{ int lru, file; |
278df9f45 mm: reclaim inval... |
642 |
bool active; |
315601809 mm: deactivate in... |
643 |
|
278df9f45 mm: reclaim inval... |
644 |
if (!PageLRU(page)) |
315601809 mm: deactivate in... |
645 |
return; |
bad49d9c8 mm: check PageUne... |
646 647 |
if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
648 649 650 |
/* Some processes are using the page */ if (page_mapped(page)) return; |
278df9f45 mm: reclaim inval... |
651 |
active = PageActive(page); |
315601809 mm: deactivate in... |
652 653 |
file = page_is_file_cache(page); lru = page_lru_base_type(page); |
fa9add641 mm/memcg: apply a... |
654 655 |
del_page_from_lru_list(page, lruvec, lru + active); |
315601809 mm: deactivate in... |
656 657 |
ClearPageActive(page); ClearPageReferenced(page); |
fa9add641 mm/memcg: apply a... |
658 |
add_page_to_lru_list(page, lruvec, lru); |
315601809 mm: deactivate in... |
659 |
|
278df9f45 mm: reclaim inval... |
660 661 662 663 664 665 666 667 668 669 670 671 |
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... |
672 |
list_move_tail(&page->lru, &lruvec->lists[lru]); |
278df9f45 mm: reclaim inval... |
673 674 675 676 677 |
__count_vm_event(PGROTATED); } if (active) __count_vm_event(PGDEACTIVATE); |
fa9add641 mm/memcg: apply a... |
678 |
update_page_reclaim_stat(lruvec, file, 0); |
315601809 mm: deactivate in... |
679 |
} |
315601809 mm: deactivate in... |
680 |
/* |
902aaed0d mm: use pagevec t... |
681 682 683 684 |
* 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 ... |
685 |
void lru_add_drain_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
686 |
{ |
13f7f7898 mm: pagevec: defe... |
687 |
struct pagevec *pvec = &per_cpu(lru_add_pvec, cpu); |
1da177e4c Linux-2.6.12-rc2 |
688 |
|
13f7f7898 mm: pagevec: defe... |
689 |
if (pagevec_count(pvec)) |
a0b8cab3b mm: remove lru pa... |
690 |
__pagevec_lru_add(pvec); |
902aaed0d mm: use pagevec t... |
691 692 693 694 695 696 697 698 699 700 |
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... |
701 702 703 |
pvec = &per_cpu(lru_deactivate_pvecs, cpu); if (pagevec_count(pvec)) |
3dd7ae8ec mm: simplify code... |
704 |
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
eb709b0d0 mm: batch activat... |
705 706 |
activate_page_drain(cpu); |
315601809 mm: deactivate in... |
707 708 709 710 711 712 713 714 715 716 717 718 |
} /** * deactivate_page - forcefully deactivate a page * @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. */ void deactivate_page(struct page *page) { |
821ed6bbe mm: filter unevic... |
719 720 721 722 723 724 |
/* * In a workload with many unevictable page such as mprotect, unevictable * page deactivation for accelerating reclaim is pointless. */ if (PageUnevictable(page)) return; |
315601809 mm: deactivate in... |
725 726 727 728 |
if (likely(get_page_unless_zero(page))) { struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs); if (!pagevec_add(pvec, page)) |
3dd7ae8ec mm: simplify code... |
729 |
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
315601809 mm: deactivate in... |
730 731 |
put_cpu_var(lru_deactivate_pvecs); } |
80bfed904 [PATCH] consolida... |
732 733 734 735 |
} void lru_add_drain(void) { |
f0cb3c76a mm: drain percpu ... |
736 |
lru_add_drain_cpu(get_cpu()); |
80bfed904 [PATCH] consolida... |
737 |
put_cpu(); |
1da177e4c Linux-2.6.12-rc2 |
738 |
} |
c4028958b WorkStruct: make ... |
739 |
static void lru_add_drain_per_cpu(struct work_struct *dummy) |
053837fce [PATCH] mm: migra... |
740 741 742 |
{ lru_add_drain(); } |
5fbc46163 mm: make lru_add_... |
743 744 745 |
static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work); void lru_add_drain_all(void) |
053837fce [PATCH] mm: migra... |
746 |
{ |
5fbc46163 mm: make lru_add_... |
747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 |
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)) || pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) || need_activate_page_drain(cpu)) { INIT_WORK(work, lru_add_drain_per_cpu); schedule_work_on(cpu, work); 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... |
773 |
} |
1da177e4c Linux-2.6.12-rc2 |
774 |
/* |
1da177e4c Linux-2.6.12-rc2 |
775 776 777 778 779 780 781 |
* Batched page_cache_release(). Decrement the reference count on all the * passed pages. If it fell to zero then remove the page from the LRU and * free it. * * Avoid taking zone->lru_lock if possible, but if it is taken, retain it * for the remainder of the operation. * |
ab33dc09a swap: update func... |
782 783 784 785 |
* The locking in this function is against shrink_inactive_list(): we recheck * the page count inside the lock to see whether shrink_inactive_list() * grabbed the page via the LRU. If it did, give up: shrink_inactive_list() * will free it. |
1da177e4c Linux-2.6.12-rc2 |
786 787 788 789 |
*/ void release_pages(struct page **pages, int nr, int cold) { int i; |
cc59850ef mm: add free_hot_... |
790 |
LIST_HEAD(pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
791 |
struct zone *zone = NULL; |
fa9add641 mm/memcg: apply a... |
792 |
struct lruvec *lruvec; |
902aaed0d mm: use pagevec t... |
793 |
unsigned long uninitialized_var(flags); |
1da177e4c Linux-2.6.12-rc2 |
794 |
|
1da177e4c Linux-2.6.12-rc2 |
795 796 |
for (i = 0; i < nr; i++) { struct page *page = pages[i]; |
1da177e4c Linux-2.6.12-rc2 |
797 |
|
8519fb30e [PATCH] mm: compo... |
798 799 |
if (unlikely(PageCompound(page))) { if (zone) { |
902aaed0d mm: use pagevec t... |
800 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
8519fb30e [PATCH] mm: compo... |
801 802 803 804 805 |
zone = NULL; } put_compound_page(page); continue; } |
b5810039a [PATCH] core remo... |
806 |
if (!put_page_testzero(page)) |
1da177e4c Linux-2.6.12-rc2 |
807 |
continue; |
46453a6e1 [PATCH] mm: never... |
808 809 |
if (PageLRU(page)) { struct zone *pagezone = page_zone(page); |
894bc3104 Unevictable LRU I... |
810 |
|
46453a6e1 [PATCH] mm: never... |
811 812 |
if (pagezone != zone) { if (zone) |
902aaed0d mm: use pagevec t... |
813 814 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
815 |
zone = pagezone; |
902aaed0d mm: use pagevec t... |
816 |
spin_lock_irqsave(&zone->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
817 |
} |
fa9add641 mm/memcg: apply a... |
818 819 |
lruvec = mem_cgroup_page_lruvec(page, zone); |
309381fea mm: dump page whe... |
820 |
VM_BUG_ON_PAGE(!PageLRU(page), page); |
674539115 [PATCH] mm: less ... |
821 |
__ClearPageLRU(page); |
fa9add641 mm/memcg: apply a... |
822 |
del_page_from_lru_list(page, lruvec, page_off_lru(page)); |
46453a6e1 [PATCH] mm: never... |
823 |
} |
c53954a09 mm: remove lru pa... |
824 825 |
/* Clear Active bit in case of parallel mark_page_accessed */ ClearPageActive(page); |
cc59850ef mm: add free_hot_... |
826 |
list_add(&page->lru, &pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
827 828 |
} if (zone) |
902aaed0d mm: use pagevec t... |
829 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
830 |
|
cc59850ef mm: add free_hot_... |
831 |
free_hot_cold_page_list(&pages_to_free, cold); |
1da177e4c Linux-2.6.12-rc2 |
832 |
} |
0be8557bc fuse: use release... |
833 |
EXPORT_SYMBOL(release_pages); |
1da177e4c Linux-2.6.12-rc2 |
834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 |
/* * 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_... |
851 |
EXPORT_SYMBOL(__pagevec_release); |
12d271078 memcg: fix split_... |
852 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
71e3aac07 thp: transparent ... |
853 |
/* used by __split_huge_page_refcount() */ |
fa9add641 mm/memcg: apply a... |
854 |
void lru_add_page_tail(struct page *page, struct page *page_tail, |
5bc7b8aca mm: thp: add spli... |
855 |
struct lruvec *lruvec, struct list_head *list) |
71e3aac07 thp: transparent ... |
856 |
{ |
71e3aac07 thp: transparent ... |
857 |
const int file = 0; |
71e3aac07 thp: transparent ... |
858 |
|
309381fea mm: dump page whe... |
859 860 861 |
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... |
862 863 |
VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&lruvec_zone(lruvec)->lru_lock)); |
71e3aac07 thp: transparent ... |
864 |
|
5bc7b8aca mm: thp: add spli... |
865 866 |
if (!list) SetPageLRU(page_tail); |
71e3aac07 thp: transparent ... |
867 |
|
12d271078 memcg: fix split_... |
868 869 |
if (likely(PageLRU(page))) list_add_tail(&page_tail->lru, &page->lru); |
5bc7b8aca mm: thp: add spli... |
870 871 872 873 874 |
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_... |
875 876 877 878 879 880 881 882 |
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... |
883 |
add_page_to_lru_list(page_tail, lruvec, page_lru(page_tail)); |
12d271078 memcg: fix split_... |
884 885 |
list_head = page_tail->lru.prev; list_move_tail(&page_tail->lru, list_head); |
71e3aac07 thp: transparent ... |
886 |
} |
7512102cf memcg: fix GPF wh... |
887 888 |
if (!PageUnevictable(page)) |
e180cf806 thp, mm: avoid Pa... |
889 |
update_page_reclaim_stat(lruvec, file, PageActive(page_tail)); |
71e3aac07 thp: transparent ... |
890 |
} |
12d271078 memcg: fix split_... |
891 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
71e3aac07 thp: transparent ... |
892 |
|
fa9add641 mm/memcg: apply a... |
893 894 |
static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec, void *arg) |
3dd7ae8ec mm: simplify code... |
895 |
{ |
13f7f7898 mm: pagevec: defe... |
896 897 898 |
int file = page_is_file_cache(page); int active = PageActive(page); enum lru_list lru = page_lru(page); |
3dd7ae8ec mm: simplify code... |
899 |
|
309381fea mm: dump page whe... |
900 |
VM_BUG_ON_PAGE(PageLRU(page), page); |
3dd7ae8ec mm: simplify code... |
901 902 |
SetPageLRU(page); |
fa9add641 mm/memcg: apply a... |
903 904 |
add_page_to_lru_list(page, lruvec, lru); update_page_reclaim_stat(lruvec, file, active); |
c6286c983 mm: add tracepoin... |
905 |
trace_mm_lru_insertion(page, page_to_pfn(page), lru, trace_pagemap_flags(page)); |
3dd7ae8ec mm: simplify code... |
906 |
} |
1da177e4c Linux-2.6.12-rc2 |
907 |
/* |
1da177e4c Linux-2.6.12-rc2 |
908 909 910 |
* Add the passed pages to the LRU, then drop the caller's refcount * on them. Reinitialises the caller's pagevec. */ |
a0b8cab3b mm: remove lru pa... |
911 |
void __pagevec_lru_add(struct pagevec *pvec) |
1da177e4c Linux-2.6.12-rc2 |
912 |
{ |
a0b8cab3b mm: remove lru pa... |
913 |
pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, NULL); |
1da177e4c Linux-2.6.12-rc2 |
914 |
} |
5095ae837 mm: fewer undersc... |
915 |
EXPORT_SYMBOL(__pagevec_lru_add); |
1da177e4c Linux-2.6.12-rc2 |
916 |
|
1da177e4c Linux-2.6.12-rc2 |
917 |
/** |
0cd6144aa mm + fs: prepare ... |
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 |
* 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; } /** |
1da177e4c Linux-2.6.12-rc2 |
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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); } |
78539fdfa [XFS] Export page... |
990 |
EXPORT_SYMBOL(pagevec_lookup); |
1da177e4c Linux-2.6.12-rc2 |
991 992 993 994 995 996 997 |
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_... |
998 |
EXPORT_SYMBOL(pagevec_lookup_tag); |
1da177e4c Linux-2.6.12-rc2 |
999 |
|
1da177e4c Linux-2.6.12-rc2 |
1000 1001 1002 1003 1004 |
/* * Perform any setup for the swap system */ void __init swap_setup(void) { |
4481374ce mm: replace vario... |
1005 |
unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT); |
e0bf68dde mm: bdi init hooks |
1006 |
#ifdef CONFIG_SWAP |
33806f06d swap: make each s... |
1007 |
int i; |
8077c0d98 bdi: test bdi_ini... |
1008 1009 |
if (bdi_init(swapper_spaces[0].backing_dev_info)) panic("Failed to init swap bdi"); |
33806f06d swap: make each s... |
1010 1011 1012 1013 |
for (i = 0; i < MAX_SWAPFILES; i++) { spin_lock_init(&swapper_spaces[i].tree_lock); INIT_LIST_HEAD(&swapper_spaces[i].i_mmap_nonlinear); } |
e0bf68dde mm: bdi init hooks |
1014 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1015 1016 1017 1018 1019 1020 1021 1022 1023 |
/* Use a smaller cluster for small-memory machines */ if (megs < 16) page_cluster = 2; else page_cluster = 3; /* * Right now other parts of the system means that we * _really_ don't want to cluster much more */ |
1da177e4c Linux-2.6.12-rc2 |
1024 |
} |