cregit-Linux how code gets into the kernel

Release 4.8 mm/swap.c

Directory: mm
/*
 *  linux/mm/swap.c
 *
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 */

/*
 * This file contains the default values for the operation of the
 * 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>
#include <linux/export.h>
#include <linux/mm_inline.h>
#include <linux/percpu_counter.h>
#include <linux/memremap.h>
#include <linux/percpu.h>
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/backing-dev.h>
#include <linux/memcontrol.h>
#include <linux/gfp.h>
#include <linux/uio.h>
#include <linux/hugetlb.h>
#include <linux/page_idle.h>

#include "internal.h"


#define CREATE_TRACE_POINTS
#include <trace/events/pagemap.h>

/* How many pages do we try to swap or page in/out together? */

int page_cluster;

static DEFINE_PER_CPU(struct pagevec, lru_add_pvec);
static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs);
static DEFINE_PER_CPU(struct pagevec, lru_deactivate_file_pvecs);
static DEFINE_PER_CPU(struct pagevec, lru_deactivate_pvecs);
#ifdef CONFIG_SMP
static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs);
#endif

/*
 * This path almost never happens for VM activity - pages are normally
 * freed via pagevecs.  But it gets used by networking.
 */

static void __page_cache_release(struct page *page) { if (PageLRU(page)) { struct zone *zone = page_zone(page); struct lruvec *lruvec; unsigned long flags; spin_lock_irqsave(zone_lru_lock(zone), flags); lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat); VM_BUG_ON_PAGE(!PageLRU(page), page); __ClearPageLRU(page); del_page_from_lru_list(page, lruvec, page_off_lru(page)); spin_unlock_irqrestore(zone_lru_lock(zone), flags); } mem_cgroup_uncharge(page); }

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adrian bunkadrian bunk6058.25%112.50%
hugh dickinshugh dickins2625.24%225.00%
mel gormanmel gorman87.77%225.00%
johannes weinerjohannes weiner54.85%112.50%
sasha levinsasha levin32.91%112.50%
andrea arcangeliandrea arcangeli10.97%112.50%
Total103100.00%8100.00%


static void __put_single_page(struct page *page) { __page_cache_release(page); free_hot_cold_page(page, false); }

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andrea arcangeliandrea arcangeli1565.22%125.00%
adrian bunkadrian bunk521.74%125.00%
li hongli hong28.70%125.00%
mel gormanmel gorman14.35%125.00%
Total23100.00%4100.00%


static void __put_compound_page(struct page *page) { compound_page_dtor *dtor; /* * __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); dtor = get_compound_page_dtor(page); (*dtor)(page); }

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andrea arcangeliandrea arcangeli2045.45%120.00%
andrew mortonandrew morton1227.27%120.00%
naoya horiguchinaoya horiguchi920.45%120.00%
hugh dickinshugh dickins24.55%120.00%
nick pigginnick piggin12.27%120.00%
Total44100.00%5100.00%


void __put_page(struct page *page) { if (unlikely(PageCompound(page))) __put_compound_page(page); else __put_single_page(page); }

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nick pigginnick piggin1858.06%125.00%
andrea arcangeliandrea arcangeli516.13%125.00%
pravin b shelarpravin b shelar516.13%125.00%
kirill a. shutemovkirill a. shutemov39.68%125.00%
Total31100.00%4100.00%

EXPORT_SYMBOL(__put_page); /** * put_pages_list() - release a list of pages * @pages: list of pages threaded on page->lru * * Release a list of pages which are strung together on page.lru. Currently * used by read_cache_pages() and related error recovery code. */
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); put_page(victim); } }

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alexander zarochentzevalexander zarochentzev5198.08%150.00%
kirill a. shutemovkirill a. shutemov11.92%150.00%
Total52100.00%2100.00%

EXPORT_SYMBOL(put_pages_list); /* * 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; pages[seg] = kmap_to_page(kiov[seg].iov_base); get_page(pages[seg]); } return seg; }

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mel gormanmel gorman8398.81%266.67%
kirill a. shutemovkirill a. shutemov11.19%133.33%
Total84100.00%3100.00%

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); }

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mel gormanmel gorman52100.00%1100.00%
Total52100.00%1100.00%

EXPORT_SYMBOL_GPL(get_kernel_page);
static void pagevec_lru_move_fn(struct pagevec *pvec, void (*move_fn)(struct page *page, struct lruvec *lruvec, void *arg), void *arg) { int i; struct pglist_data *pgdat = NULL; struct lruvec *lruvec; unsigned long flags = 0; for (i = 0; i < pagevec_count(pvec); i++) { struct page *page = pvec->pages[i]; struct pglist_data *pagepgdat = page_pgdat(page); if (pagepgdat != pgdat) { if (pgdat) spin_unlock_irqrestore(&pgdat->lru_lock, flags); pgdat = pagepgdat; spin_lock_irqsave(&pgdat->lru_lock, flags); } lruvec = mem_cgroup_page_lruvec(page, pgdat); (*move_fn)(page, lruvec, arg); } if (pgdat) spin_unlock_irqrestore(&pgdat->lru_lock, flags); release_pages(pvec->pages, pvec->nr, pvec->cold); pagevec_reinit(pvec); }

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li shaohuali shaohua7238.30%125.00%
hisashi hifumihisashi hifumi7238.30%125.00%
mel gormanmel gorman2412.77%125.00%
hugh dickinshugh dickins2010.64%125.00%
Total188100.00%4100.00%


static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec, void *arg) { int *pgmoved = arg; if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { enum lru_list lru = page_lru_base_type(page); list_move_tail(&page->lru, &lruvec->lists[lru]); (*pgmoved)++; } }

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hisashi hifumihisashi hifumi2734.62%110.00%
li shaohuali shaohua2532.05%110.00%
rik van rielrik van riel78.97%110.00%
lee schermerhornlee schermerhorn67.69%110.00%
hugh dickinshugh dickins56.41%110.00%
johannes weinerjohannes weiner45.13%330.00%
christoph lameterchristoph lameter22.56%110.00%
minchan kimminchan kim22.56%110.00%
Total78100.00%10100.00%

/* * 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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li shaohuali shaohua2163.64%150.00%
hisashi hifumihisashi hifumi1236.36%150.00%
Total33100.00%2100.00%

/* * 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 * inactive list. */
void rotate_reclaimable_page(struct page *page) { if (!PageLocked(page) && !PageDirty(page) && !PageActive(page) && !PageUnevictable(page) && PageLRU(page)) { struct pagevec *pvec; unsigned long flags; get_page(page); local_irq_save(flags); pvec = this_cpu_ptr(&lru_rotate_pvecs); if (!pagevec_add(pvec, page) || PageCompound(page)) pagevec_move_tail(pvec); local_irq_restore(flags); } }

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andrew mortonandrew morton4951.58%225.00%
miklos szeredimiklos szeredi1818.95%112.50%
hisashi hifumihisashi hifumi1414.74%112.50%
lee schermerhornlee schermerhorn66.32%112.50%
lukasz odziobalukasz odzioba55.26%112.50%
christoph lameterchristoph lameter22.11%112.50%
kirill a. shutemovkirill a. shutemov11.05%112.50%
Total95100.00%8100.00%


static void update_page_reclaim_stat(struct lruvec *lruvec, int file, int rotated) { struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat; reclaim_stat->recent_scanned[file]++; if (rotated) reclaim_stat->recent_rotated[file]++; }

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kosaki motohirokosaki motohiro3778.72%133.33%
hugh dickinshugh dickins1021.28%266.67%
Total47100.00%3100.00%


static void __activate_page(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); SetPageActive(page); lru += LRU_ACTIVE; add_page_to_lru_list(page, lruvec, lru); trace_mm_lru_activate(page); __count_vm_event(PGACTIVATE); update_page_reclaim_stat(lruvec, file, 1); } }

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linus torvaldslinus torvalds2221.36%215.38%
pre-gitpre-git2221.36%17.69%
rik van rielrik van riel1514.56%17.69%
hugh dickinshugh dickins109.71%17.69%
andrew mortonandrew morton87.77%215.38%
li shaohuali shaohua76.80%17.69%
kosaki motohirokosaki motohiro65.83%17.69%
mel gormanmel gorman54.85%17.69%
lee schermerhornlee schermerhorn32.91%17.69%
johannes weinerjohannes weiner32.91%17.69%
christoph lameterchristoph lameter21.94%17.69%
Total103100.00%13100.00%

#ifdef CONFIG_SMP
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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li shaohuali shaohua38100.00%1100.00%
Total38100.00%1100.00%


static bool need_activate_page_drain(int cpu) { return pagevec_count(&per_cpu(activate_page_pvecs, cpu)) != 0; }

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chris metcalfchris metcalf23100.00%1100.00%
Total23100.00%1100.00%


void activate_page(struct page *page) { page = compound_head(page); if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { struct pagevec *pvec = &get_cpu_var(activate_page_pvecs); get_page(page); if (!pagevec_add(pvec, page) || PageCompound(page)) pagevec_lru_move_fn(pvec, __activate_page, NULL); put_cpu_var(activate_page_pvecs); } }

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li shaohuali shaohua7084.34%125.00%
kirill a. shutemovkirill a. shutemov89.64%250.00%
lukasz odziobalukasz odzioba56.02%125.00%
Total83100.00%4100.00%

#else
static inline void activate_page_drain(int cpu) { }

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li shaohuali shaohua9100.00%1100.00%
Total9100.00%1100.00%


static bool need_activate_page_drain(int cpu) { return false; }

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chris metcalfchris metcalf12100.00%1100.00%
Total12100.00%1100.00%


void activate_page(struct page *page) { struct zone *zone = page_zone(page); page = compound_head(page); spin_lock_irq(zone_lru_lock(zone)); __activate_page(page, mem_cgroup_page_lruvec(page, zone->zone_pgdat), NULL); spin_unlock_irq(zone_lru_lock(zone)); }

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li shaohuali shaohua3152.54%112.50%
mel gormanmel gorman813.56%225.00%
kirill a. shutemovkirill a. shutemov711.86%112.50%
hugh dickinshugh dickins711.86%112.50%
pre-gitpre-git46.78%112.50%
andrew mortonandrew morton23.39%225.00%
Total59100.00%8100.00%

#endif
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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mel gormanmel gorman77100.00%1100.00%
Total77100.00%1100.00%

/* * Mark a page as having seen activity. * * inactive,unreferenced -> inactive,referenced * inactive,referenced -> active,unreferenced * active,unreferenced -> active,referenced * * 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). */
void mark_page_accessed(struct page *page) { page = compound_head(page); if (!PageActive(page) && !PageUnevictable(page) && 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); ClearPageReferenced(page); if (page_is_file_cache(page)) workingset_activation(page); } else if (!PageReferenced(page)) { SetPageReferenced(page); } if (page_is_idle(page)) clear_page_idle(page); }

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andrew mortonandrew morton5452.94%116.67%
vladimir davydovvladimir davydov1211.76%116.67%
johannes weinerjohannes weiner1211.76%116.67%
mel gormanmel gorman1110.78%116.67%
kirill a. shutemovkirill a. shutemov76.86%116.67%
lee schermerhornlee schermerhorn65.88%116.67%
Total102100.00%6100.00%

EXPORT_SYMBOL(mark_page_accessed);
static void __lru_cache_add(struct page *page) { struct pagevec *pvec = &get_cpu_var(lru_add_pvec); get_page(page); if (!pagevec_add(pvec, page) || PageCompound(page)) __pagevec_lru_add(pvec); put_cpu_var(lru_add_pvec); }

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andrew mortonandrew morton1630.77%220.00%
pre-gitpre-git1528.85%110.00%
lukasz odziobalukasz odzioba815.38%110.00%
robin dongrobin dong47.69%110.00%
rusty russellrusty russell47.69%110.00%
mel gormanmel gorman23.85%110.00%
kirill a. shutemovkirill a. shutemov11.92%110.00%
kosaki motohirokosaki motohiro11.92%110.00%
jianyu zhanjianyu zhan11.92%110.00%
Total52100.00%10100.00%

/** * lru_cache_add: add a page to the page lists * @page: the page to add */
void lru_cache_add_anon(struct page *page) { if (PageActive(page)) ClearPageActive(page); __lru_cache_add(page); }

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jianyu zhanjianyu zhan2074.07%150.00%
mel gormanmel gorman725.93%150.00%
Total27100.00%2100.00%


void lru_cache_add_file(struct page *page) { if (PageActive(page)) ClearPageActive(page); __lru_cache_add(page); }

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jianyu zhanjianyu zhan2074.07%150.00%
mel gormanmel gorman725.93%150.00%
Total27100.00%2100.00%

EXPORT_SYMBOL(lru_cache_add_file); /** * lru_cache_add - add a page to a page list * @page: the page to be added to the LRU. * * 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(). */
void lru_cache_add(struct page *page) { VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page); VM_BUG_ON_PAGE(PageLRU(page), page); __lru_cache_add(page); }

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andrew mortonandrew morton1537.50%114.29%
lee schermerhornlee schermerhorn1025.00%114.29%
sasha levinsasha levin615.00%114.29%
kosaki motohirokosaki motohiro410.00%114.29%
rusty russellrusty russell25.00%114.29%
naoya horiguchinaoya horiguchi25.00%114.29%
mel gormanmel gorman12.50%114.29%
Total40100.00%7100.00%

/** * 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 pglist_data *pgdat = page_pgdat(page); struct lruvec *lruvec; spin_lock_irq(&pgdat->lru_lock); lruvec = mem_cgroup_page_lruvec(page, pgdat); ClearPageActive(page); SetPageUnevictable(page); SetPageLRU(page); add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE); spin_unlock_irq(&pgdat->lru_lock); }

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lee schermerhornlee schermerhorn4256.76%125.00%
hugh dickinshugh dickins1520.27%125.00%
mel gormanmel gorman1216.22%125.00%
naoya horiguchinaoya horiguchi56.76%125.00%
Total74100.00%4100.00%

/** * 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); }

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johannes weinerjohannes weiner93100.00%1100.00%
Total93100.00%1100.00%

/* * 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. * * 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. */
static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec, void *arg) { int lru, file; bool active; if (!PageLRU(page)) return; if (PageUnevictable(page)) return; /* Some processes are using the page */ if (page_mapped(page)) return; active = PageActive(page); file = page_is_file_cache(page); lru = page_lru_base_type(page); del_page_from_lru_list(page, lruvec, lru + active); ClearPageActive(page); ClearPageReferenced(page); add_page_to_lru_list(page, lruvec, lru); 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. */ list_move_tail(&page->lru, &lruvec->lists[lru]); __count_vm_event(PGROTATED); } if (active) __count_vm_event(PGDEACTIVATE); update_page_reclaim_stat(lruvec, file, 0); }

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minchan kimminchan kim15391.07%450.00%
hugh dickinshugh dickins105.95%112.50%
johannes weinerjohannes weiner31.79%225.00%
li shaohuali shaohua21.19%112.50%
Total168100.00%8100.00%


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); } }

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minchan kimminchan kim100100.00%1100.00%
Total100100.00%1100.00%

/* * 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. */
void lru_add_drain_cpu(int cpu) { struct pagevec *pvec = &per_cpu(lru_add_pvec, cpu); if (pagevec_count(pvec)) __pagevec_lru_add(pvec); 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); } pvec = &per_cpu(lru_deactivate_file_pvecs, cpu); if (pagevec_count(pvec)) pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); pvec = &per_cpu(lru_deactivate_pvecs, cpu); if (pagevec_count(pvec)) pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); activate_page_drain(cpu); }

Contributors

PersonTokensPropCommitsCommitProp
minchan kimminchan kim4937.98%323.08%
hisashi hifumihisashi hifumi3930.23%17.69%
andrew mortonandrew morton2519.38%323.08%
li shaohuali shaohua96.98%215.38%
mel gormanmel gorman32.33%17.69%
kosaki motohirokosaki motohiro21.55%17.69%
hugh dickinshugh dickins10.78%17.69%
konstantin khlebnikovkonstantin khlebnikov10.78%17.69%
Total129100.00%13100.00%

/** * deactivate_file_page - forcefully deactivate a file 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_file_page(struct page *page) { /* * In a workload with many unevictable page such as mprotect, * unevictable page deactivation for accelerating reclaim is pointless. */ if (PageUnevictable(page)) return; if (likely(get_page_unless_zero(page))) { struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs); if (!pagevec_add(pvec, page) || PageCompound(page)) pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL); put_cpu_var(lru_deactivate_file_pvecs); } }

Contributors

PersonTokensPropCommitsCommitProp
minchan kimminchan kim6185.92%350.00%
lukasz odziobalukasz odzioba57.04%116.67%
li shaohuali shaohua45.63%116.67%
andrew mortonandrew morton11.41%116.67%
Total71100.00%6100.00%

/** * deactivate_page - deactivate a page * @page: page to deactivate * * deactivate_page() moves @page to the inactive list if @page was on the active * list and was not an unevictable page. This is done to accelerate the reclaim * of @page. */
void deactivate_page(struct page *page) { if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) { struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs); get_page(page); if (!pagevec_add(pvec, page) || PageCompound(page)) pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); put_cpu_var(lru_deactivate_pvecs); } }

Contributors

PersonTokensPropCommitsCommitProp
minchan kimminchan kim6992.00%133.33%
lukasz odziobalukasz odzioba56.67%133.33%
kirill a. shutemovkirill a. shutemov11.33%133.33%
Total75100.00%3100.00%


void lru_add_drain(void) { lru_add_drain_cpu(get_cpu()); put_cpu(); }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton1168.75%125.00%
pre-gitpre-git212.50%125.00%
rusty russellrusty russell212.50%125.00%
konstantin khlebnikovkonstantin khlebnikov16.25%125.00%
Total16100.00%4100.00%


static void lru_add_drain_per_cpu(struct work_struct *dummy) { lru_add_drain(); }

Contributors

PersonTokensPropCommitsCommitProp
nick pigginnick piggin1285.71%150.00%
david howellsdavid howells214.29%150.00%
Total14100.00%2100.00%

static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work); /* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
wang sheng-huiwang sheng-hui37100.00%1100.00%
Total37100.00%1100.00%

early_initcall(lru_init);
void lru_add_drain_all(void) { 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_file_pvecs, cpu)) || pagevec_count(&per_cpu(lru_deactivate_pvecs, cpu)) || need_activate_page_drain(cpu)) { INIT_WORK(work, lru_add_drain_per_cpu); queue_work_on(cpu, lru_add_drain_wq, 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); }

Contributors

PersonTokensPropCommitsCommitProp
chris metcalfchris metcalf13484.81%120.00%
minchan kimminchan kim127.59%240.00%
nick pigginnick piggin95.70%120.00%
wang sheng-huiwang sheng-hui31.90%120.00%
Total158100.00%5100.00%

/** * release_pages - batched put_page() * @pages: array of pages to release * @nr: number of pages * @cold: whether the pages are cache cold * * Decrement the reference count on all the pages in @pages. If it * fell to zero, remove the page from the LRU and free it. */
void release_pages(struct page **pages, int nr, bool cold) { int i; LIST_HEAD(pages_to_free); struct pglist_data *locked_pgdat = NULL; struct lruvec *lruvec; unsigned long uninitialized_var(flags); unsigned int uninitialized_var(lock_batch); for (i = 0; i < nr; i++) { struct page *page = pages[i]; /* * Make sure the IRQ-safe lock-holding time does not get * excessive with a continuous string of pages from the * same pgdat. The lock is held only if pgdat != NULL. */ if (locked_pgdat && ++lock_batch == SWAP_CLUSTER_MAX) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; } if (is_huge_zero_page(page)) { put_huge_zero_page(); continue; } page = compound_head(page); if (!put_page_testzero(page)) continue; if (PageCompound(page)) { if (locked_pgdat) { spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); locked_pgdat = NULL; } __put_compound_page(page); continue; } if (PageLRU(page)) { struct pglist_data *pgdat = page_pgdat(page); if (pgdat != locked_pgdat) { if (locked_pgdat) spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags); lock_batch = 0; locked_pgdat = pgdat; spin_lock_irqsave