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[PATCH] mm: less atomic ops
In the page release paths, we can be sure that nobody will mess with our page->flags because the refcount has dropped to 0. So no need for atomic operations here. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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parent
4c84cacfa4
commit
674539115c
3 changed files with 5 additions and 3 deletions
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@ -32,7 +32,7 @@ del_page_from_lru(struct zone *zone, struct page *page)
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{
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list_del(&page->lru);
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if (PageActive(page)) {
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ClearPageActive(page);
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__ClearPageActive(page);
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zone->nr_active--;
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} else {
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zone->nr_inactive--;
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@ -242,10 +242,12 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
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#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
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#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags)
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#define ClearPageLRU(page) clear_bit(PG_lru, &(page)->flags)
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#define __ClearPageLRU(page) __clear_bit(PG_lru, &(page)->flags)
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#define PageActive(page) test_bit(PG_active, &(page)->flags)
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#define SetPageActive(page) set_bit(PG_active, &(page)->flags)
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#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags)
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#define __ClearPageActive(page) __clear_bit(PG_active, &(page)->flags)
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#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
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#define SetPageSlab(page) set_bit(PG_slab, &(page)->flags)
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@ -215,7 +215,7 @@ void fastcall __page_cache_release(struct page *page)
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spin_lock_irqsave(&zone->lru_lock, flags);
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BUG_ON(!PageLRU(page));
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ClearPageLRU(page);
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__ClearPageLRU(page);
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del_page_from_lru(zone, page);
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spin_unlock_irqrestore(&zone->lru_lock, flags);
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}
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@ -266,7 +266,7 @@ void release_pages(struct page **pages, int nr, int cold)
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spin_lock_irq(&zone->lru_lock);
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}
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BUG_ON(!PageLRU(page));
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ClearPageLRU(page);
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__ClearPageLRU(page);
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del_page_from_lru(zone, page);
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}
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