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mm/swap.c
20.5 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> #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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|
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#include "internal.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[NR_LRU_LISTS], lru_add_pvecs); |
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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)) { unsigned long flags; struct zone *zone = page_zone(page); spin_lock_irqsave(&zone->lru_lock, flags); VM_BUG_ON(!PageLRU(page)); __ClearPageLRU(page); |
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del_page_from_lru_list(zone, page, 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) { if (unlikely(PageTail(page))) { /* __split_huge_page_refcount can run under us */ |
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struct page *page_head = compound_trans_head(page); if (likely(page != page_head && get_page_unless_zero(page_head))) { |
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unsigned long flags; /* |
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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. |
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*/ |
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flags = compound_lock_irqsave(page_head); if (unlikely(!PageTail(page))) { /* __split_huge_page_refcount run before us */ compound_unlock_irqrestore(page_head, flags); VM_BUG_ON(PageHead(page_head)); |
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if (put_page_testzero(page_head)) __put_single_page(page_head); out_put_single: if (put_page_testzero(page)) __put_single_page(page); return; } VM_BUG_ON(page_head != page->first_page); /* * We can release the refcount taken by |
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* get_page_unless_zero() now that * __split_huge_page_refcount() is blocked on * the compound_lock. |
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*/ if (put_page_testzero(page_head)) VM_BUG_ON(1); /* __split_huge_page_refcount will wait now */ |
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VM_BUG_ON(page_mapcount(page) <= 0); atomic_dec(&page->_mapcount); |
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VM_BUG_ON(atomic_read(&page_head->_count) <= 0); |
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VM_BUG_ON(atomic_read(&page->_count) != 0); |
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compound_unlock_irqrestore(page_head, flags); |
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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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} else { /* page_head is a dangling pointer */ VM_BUG_ON(PageTail(page)); goto out_put_single; } } else if (put_page_testzero(page)) { if (PageHead(page)) __put_compound_page(page); else __put_single_page(page); |
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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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/* * 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(). */ unsigned long flags; bool got = false; struct page *page_head = compound_trans_head(page); if (likely(page != page_head && get_page_unless_zero(page_head))) { /* * 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; } compound_unlock_irqrestore(page_head, flags); if (unlikely(!got)) put_page(page_head); } 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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static void pagevec_lru_move_fn(struct pagevec *pvec, void (*move_fn)(struct page *page, void *arg), void *arg) |
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{ int i; |
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struct zone *zone = NULL; |
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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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(*move_fn)(page, 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, void *arg) { 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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struct lruvec *lruvec; lruvec = mem_cgroup_lru_move_lists(page_zone(page), page, lru, lru); 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 zone *zone, struct page *page, int file, int rotated) { struct zone_reclaim_stat *reclaim_stat = &zone->reclaim_stat; struct zone_reclaim_stat *memcg_reclaim_stat; memcg_reclaim_stat = mem_cgroup_get_reclaim_stat_from_page(page); reclaim_stat->recent_scanned[file]++; if (rotated) reclaim_stat->recent_rotated[file]++; if (!memcg_reclaim_stat) return; memcg_reclaim_stat->recent_scanned[file]++; if (rotated) memcg_reclaim_stat->recent_rotated[file]++; } |
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static void __activate_page(struct page *page, void *arg) |
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{ struct zone *zone = page_zone(page); |
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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); del_page_from_lru_list(zone, page, lru); |
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SetPageActive(page); lru += LRU_ACTIVE; add_page_to_lru_list(zone, page, lru); __count_vm_event(PGACTIVATE); |
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update_page_reclaim_stat(zone, page, file, 1); |
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} |
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} #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); } 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) { } void activate_page(struct page *page) { struct zone *zone = page_zone(page); spin_lock_irq(&zone->lru_lock); __activate_page(page, NULL); |
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spin_unlock_irq(&zone->lru_lock); } |
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#endif |
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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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void mark_page_accessed(struct page *page) |
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{ |
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if (!PageActive(page) && !PageUnevictable(page) && PageReferenced(page) && PageLRU(page)) { |
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activate_page(page); ClearPageReferenced(page); } else if (!PageReferenced(page)) { SetPageReferenced(page); } } |
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EXPORT_SYMBOL(mark_page_accessed); |
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void __lru_cache_add(struct page *page, enum lru_list lru) |
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{ |
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struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru]; |
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page_cache_get(page); if (!pagevec_add(pvec, page)) |
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__pagevec_lru_add(pvec, lru); |
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put_cpu_var(lru_add_pvecs); } |
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EXPORT_SYMBOL(__lru_cache_add); |
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|
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/** * lru_cache_add_lru - add a page to a page list * @page: the page to be added to the LRU. * @lru: the LRU list to which the page is added. */ void lru_cache_add_lru(struct page *page, enum lru_list lru) |
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{ |
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if (PageActive(page)) { |
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VM_BUG_ON(PageUnevictable(page)); |
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ClearPageActive(page); |
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} else if (PageUnevictable(page)) { VM_BUG_ON(PageActive(page)); ClearPageUnevictable(page); |
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} |
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VM_BUG_ON(PageLRU(page) || PageActive(page) || PageUnevictable(page)); |
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__lru_cache_add(page, lru); |
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} |
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/** * 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); spin_lock_irq(&zone->lru_lock); SetPageUnevictable(page); SetPageLRU(page); add_page_to_lru_list(zone, page, LRU_UNEVICTABLE); spin_unlock_irq(&zone->lru_lock); } |
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/* |
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* 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. |
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* * 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. |
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*/ |
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static void lru_deactivate_fn(struct page *page, void *arg) |
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{ int lru, file; |
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bool active; |
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struct zone *zone = page_zone(page); |
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|
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if (!PageLRU(page)) |
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return; |
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if (PageUnevictable(page)) return; |
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/* Some processes are using the page */ if (page_mapped(page)) return; |
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active = PageActive(page); |
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file = page_is_file_cache(page); lru = page_lru_base_type(page); |
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del_page_from_lru_list(zone, page, lru + active); |
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ClearPageActive(page); ClearPageReferenced(page); add_page_to_lru_list(zone, page, lru); |
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|
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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 { |
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struct lruvec *lruvec; |
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/* * The page's writeback ends up during pagevec * We moves tha page into tail of inactive. */ |
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lruvec = mem_cgroup_lru_move_lists(zone, page, lru, lru); list_move_tail(&page->lru, &lruvec->lists[lru]); |
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__count_vm_event(PGROTATED); } if (active) __count_vm_event(PGDEACTIVATE); |
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update_page_reclaim_stat(zone, page, file, 0); } |
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/* |
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* 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. */ static void drain_cpu_pagevecs(int cpu) |
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{ |
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struct pagevec *pvecs = per_cpu(lru_add_pvecs, cpu); |
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struct pagevec *pvec; |
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int lru; |
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|
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for_each_lru(lru) { pvec = &pvecs[lru - LRU_BASE]; if (pagevec_count(pvec)) |
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491 |
__pagevec_lru_add(pvec, lru); |
f04e9ebbe swap: use an arra... |
492 |
} |
902aaed0d mm: use pagevec t... |
493 494 495 496 497 498 499 500 501 502 |
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... |
503 504 505 |
pvec = &per_cpu(lru_deactivate_pvecs, cpu); if (pagevec_count(pvec)) |
3dd7ae8ec mm: simplify code... |
506 |
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
eb709b0d0 mm: batch activat... |
507 508 |
activate_page_drain(cpu); |
315601809 mm: deactivate in... |
509 510 511 512 513 514 515 516 517 518 519 520 |
} /** * 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... |
521 522 523 524 525 526 |
/* * 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... |
527 528 529 530 |
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... |
531 |
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); |
315601809 mm: deactivate in... |
532 533 |
put_cpu_var(lru_deactivate_pvecs); } |
80bfed904 [PATCH] consolida... |
534 535 536 537 |
} void lru_add_drain(void) { |
902aaed0d mm: use pagevec t... |
538 |
drain_cpu_pagevecs(get_cpu()); |
80bfed904 [PATCH] consolida... |
539 |
put_cpu(); |
1da177e4c Linux-2.6.12-rc2 |
540 |
} |
c4028958b WorkStruct: make ... |
541 |
static void lru_add_drain_per_cpu(struct work_struct *dummy) |
053837fce [PATCH] mm: migra... |
542 543 544 545 546 547 548 549 550 |
{ lru_add_drain(); } /* * Returns 0 for success */ int lru_add_drain_all(void) { |
c4028958b WorkStruct: make ... |
551 |
return schedule_on_each_cpu(lru_add_drain_per_cpu); |
053837fce [PATCH] mm: migra... |
552 |
} |
1da177e4c Linux-2.6.12-rc2 |
553 |
/* |
1da177e4c Linux-2.6.12-rc2 |
554 555 556 557 558 559 560 |
* 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... |
561 562 563 564 |
* 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 |
565 566 567 568 |
*/ void release_pages(struct page **pages, int nr, int cold) { int i; |
cc59850ef mm: add free_hot_... |
569 |
LIST_HEAD(pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
570 |
struct zone *zone = NULL; |
902aaed0d mm: use pagevec t... |
571 |
unsigned long uninitialized_var(flags); |
1da177e4c Linux-2.6.12-rc2 |
572 |
|
1da177e4c Linux-2.6.12-rc2 |
573 574 |
for (i = 0; i < nr; i++) { struct page *page = pages[i]; |
1da177e4c Linux-2.6.12-rc2 |
575 |
|
8519fb30e [PATCH] mm: compo... |
576 577 |
if (unlikely(PageCompound(page))) { if (zone) { |
902aaed0d mm: use pagevec t... |
578 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
8519fb30e [PATCH] mm: compo... |
579 580 581 582 583 |
zone = NULL; } put_compound_page(page); continue; } |
b5810039a [PATCH] core remo... |
584 |
if (!put_page_testzero(page)) |
1da177e4c Linux-2.6.12-rc2 |
585 |
continue; |
46453a6e1 [PATCH] mm: never... |
586 587 |
if (PageLRU(page)) { struct zone *pagezone = page_zone(page); |
894bc3104 Unevictable LRU I... |
588 |
|
46453a6e1 [PATCH] mm: never... |
589 590 |
if (pagezone != zone) { if (zone) |
902aaed0d mm: use pagevec t... |
591 592 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
593 |
zone = pagezone; |
902aaed0d mm: use pagevec t... |
594 |
spin_lock_irqsave(&zone->lru_lock, flags); |
46453a6e1 [PATCH] mm: never... |
595 |
} |
725d704ec [PATCH] mm: VM_BU... |
596 |
VM_BUG_ON(!PageLRU(page)); |
674539115 [PATCH] mm: less ... |
597 |
__ClearPageLRU(page); |
1c1c53d43 mm: remove del_pa... |
598 |
del_page_from_lru_list(zone, page, page_off_lru(page)); |
46453a6e1 [PATCH] mm: never... |
599 |
} |
cc59850ef mm: add free_hot_... |
600 |
list_add(&page->lru, &pages_to_free); |
1da177e4c Linux-2.6.12-rc2 |
601 602 |
} if (zone) |
902aaed0d mm: use pagevec t... |
603 |
spin_unlock_irqrestore(&zone->lru_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
604 |
|
cc59850ef mm: add free_hot_... |
605 |
free_hot_cold_page_list(&pages_to_free, cold); |
1da177e4c Linux-2.6.12-rc2 |
606 |
} |
0be8557bc fuse: use release... |
607 |
EXPORT_SYMBOL(release_pages); |
1da177e4c Linux-2.6.12-rc2 |
608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 |
/* * 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_... |
625 |
EXPORT_SYMBOL(__pagevec_release); |
12d271078 memcg: fix split_... |
626 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
71e3aac07 thp: transparent ... |
627 628 629 630 631 632 633 |
/* used by __split_huge_page_refcount() */ void lru_add_page_tail(struct zone* zone, struct page *page, struct page *page_tail) { int active; enum lru_list lru; const int file = 0; |
71e3aac07 thp: transparent ... |
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 |
VM_BUG_ON(!PageHead(page)); VM_BUG_ON(PageCompound(page_tail)); VM_BUG_ON(PageLRU(page_tail)); VM_BUG_ON(!spin_is_locked(&zone->lru_lock)); SetPageLRU(page_tail); if (page_evictable(page_tail, NULL)) { if (PageActive(page)) { SetPageActive(page_tail); active = 1; lru = LRU_ACTIVE_ANON; } else { active = 0; lru = LRU_INACTIVE_ANON; } update_page_reclaim_stat(zone, page_tail, file, active); |
71e3aac07 thp: transparent ... |
652 653 |
} else { SetPageUnevictable(page_tail); |
12d271078 memcg: fix split_... |
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 |
lru = LRU_UNEVICTABLE; } if (likely(PageLRU(page))) list_add_tail(&page_tail->lru, &page->lru); else { 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. */ add_page_to_lru_list(zone, page_tail, lru); list_head = page_tail->lru.prev; list_move_tail(&page_tail->lru, list_head); |
71e3aac07 thp: transparent ... |
671 672 |
} } |
12d271078 memcg: fix split_... |
673 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
71e3aac07 thp: transparent ... |
674 |
|
5095ae837 mm: fewer undersc... |
675 |
static void __pagevec_lru_add_fn(struct page *page, void *arg) |
3dd7ae8ec mm: simplify code... |
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 |
{ enum lru_list lru = (enum lru_list)arg; struct zone *zone = page_zone(page); int file = is_file_lru(lru); int active = is_active_lru(lru); VM_BUG_ON(PageActive(page)); VM_BUG_ON(PageUnevictable(page)); VM_BUG_ON(PageLRU(page)); SetPageLRU(page); if (active) SetPageActive(page); update_page_reclaim_stat(zone, page, file, active); add_page_to_lru_list(zone, page, lru); } |
1da177e4c Linux-2.6.12-rc2 |
692 |
/* |
1da177e4c Linux-2.6.12-rc2 |
693 694 695 |
* Add the passed pages to the LRU, then drop the caller's refcount * on them. Reinitialises the caller's pagevec. */ |
5095ae837 mm: fewer undersc... |
696 |
void __pagevec_lru_add(struct pagevec *pvec, enum lru_list lru) |
1da177e4c Linux-2.6.12-rc2 |
697 |
{ |
894bc3104 Unevictable LRU I... |
698 |
VM_BUG_ON(is_unevictable_lru(lru)); |
1da177e4c Linux-2.6.12-rc2 |
699 |
|
5095ae837 mm: fewer undersc... |
700 |
pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, (void *)lru); |
1da177e4c Linux-2.6.12-rc2 |
701 |
} |
5095ae837 mm: fewer undersc... |
702 |
EXPORT_SYMBOL(__pagevec_lru_add); |
1da177e4c Linux-2.6.12-rc2 |
703 |
|
1da177e4c Linux-2.6.12-rc2 |
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 |
/** * 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... |
726 |
EXPORT_SYMBOL(pagevec_lookup); |
1da177e4c Linux-2.6.12-rc2 |
727 728 729 730 731 732 733 |
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_... |
734 |
EXPORT_SYMBOL(pagevec_lookup_tag); |
1da177e4c Linux-2.6.12-rc2 |
735 |
|
1da177e4c Linux-2.6.12-rc2 |
736 737 738 739 740 |
/* * Perform any setup for the swap system */ void __init swap_setup(void) { |
4481374ce mm: replace vario... |
741 |
unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
742 |
|
e0bf68dde mm: bdi init hooks |
743 744 745 |
#ifdef CONFIG_SWAP bdi_init(swapper_space.backing_dev_info); #endif |
1da177e4c Linux-2.6.12-rc2 |
746 747 748 749 750 751 752 753 754 |
/* 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 |
755 |
} |