xiaomi-sm8450/android_kernel_xiaomi_sm8450
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[PATCH] mm: never ClearPageLRU released pages

Ver a proveniência 
If vmscan finds a zero refcount page on the lru list, never ClearPageLRU
it.  This means the release code need not hold ->lru_lock to stabilise
PageLRU, so that lock may be skipped entirely when releasing !PageLRU pages
(because we know PageLRU won't have been temporarily cleared by vmscan,
which was previously guaranteed by holding the lock to synchronise against
vmscan).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Este cometimento está contido em:
Nick Piggin
2006-03-22 00:07:58 -08:00
cometido por Linus Torvalds
ascendente 2492ecc1a1
cometimento 46453a6e19
2 ficheiros modificados com 39 adições e 33 eliminações
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54
mm/swap.c
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@@ -209,19 +209,18 @@ int lru_add_drain_all(void)
*/
void fastcall __page_cache_release(struct page *page)
{
unsigned long flags;
struct zone *zone = page_zone(page);
if (PageLRU(page)) {
unsigned long flags;
struct zone *zone = page_zone(page);
spin_lock_irqsave(&zone->lru_lock, flags);
if (TestClearPageLRU(page))
spin_lock_irqsave(&zone->lru_lock, flags);
if (!TestClearPageLRU(page))
BUG();
del_page_from_lru(zone, page);
if (page_count(page) != 0)
page = NULL;
spin_unlock_irqrestore(&zone->lru_lock, flags);
if (page)
free_hot_page(page);
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
free_hot_page(page);
}
EXPORT_SYMBOL(__page_cache_release);
/*
@@ -245,7 +244,6 @@ void release_pages(struct page **pages, int nr, int cold)
pagevec_init(&pages_to_free, cold);
for (i = 0; i < nr; i++) {
struct page *page = pages[i];
struct zone *pagezone;
if (unlikely(PageCompound(page))) {
if (zone) {
@@ -259,23 +257,27 @@ void release_pages(struct page **pages, int nr, int cold)
if (!put_page_testzero(page))
continue;
pagezone = page_zone(page);
if (pagezone != zone) {
if (zone)
spin_unlock_irq(&zone->lru_lock);
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
if (TestClearPageLRU(page))
del_page_from_lru(zone, page);
if (page_count(page) == 0) {
if (!pagevec_add(&pages_to_free, page)) {
spin_unlock_irq(&zone->lru_lock);
__pagevec_free(&pages_to_free);
pagevec_reinit(&pages_to_free);
zone = NULL; /* No lock is held */
if (PageLRU(page)) {
struct zone *pagezone = page_zone(page);
if (pagezone != zone) {
if (zone)
spin_unlock_irq(&zone->lru_lock);
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
if (!TestClearPageLRU(page))
BUG();
del_page_from_lru(zone, page);
}
if (!pagevec_add(&pages_to_free, page)) {
if (zone) {
spin_unlock_irq(&zone->lru_lock);
zone = NULL;
}
__pagevec_free(&pages_to_free);
pagevec_reinit(&pages_to_free);
}
}
if (zone)
spin_unlock_irq(&zone->lru_lock);