[PATCH] mm: PageLRU no testset
PG_lru is protected by zone->lru_lock. It does not need TestSet/TestClear operations. 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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8d438f96d2
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@ -239,10 +239,9 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
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#define __ClearPageDirty(page) __clear_bit(PG_dirty, &(page)->flags)
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#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)
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#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags)
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#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
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#define TestSetPageLRU(page) test_and_set_bit(PG_lru, &(page)->flags)
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#define TestClearPageLRU(page) test_and_clear_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 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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16
mm/swap.c
16
mm/swap.c
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@ -214,8 +214,8 @@ void fastcall __page_cache_release(struct page *page)
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struct zone *zone = page_zone(page);
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spin_lock_irqsave(&zone->lru_lock, flags);
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if (!TestClearPageLRU(page))
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BUG();
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BUG_ON(!PageLRU(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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@ -265,8 +265,8 @@ void release_pages(struct page **pages, int nr, int cold)
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zone = pagezone;
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spin_lock_irq(&zone->lru_lock);
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}
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if (!TestClearPageLRU(page))
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BUG();
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BUG_ON(!PageLRU(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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@ -345,8 +345,8 @@ void __pagevec_lru_add(struct pagevec *pvec)
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zone = pagezone;
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spin_lock_irq(&zone->lru_lock);
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}
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if (TestSetPageLRU(page))
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BUG();
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BUG_ON(PageLRU(page));
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SetPageLRU(page);
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add_page_to_inactive_list(zone, page);
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}
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if (zone)
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@ -372,8 +372,8 @@ void __pagevec_lru_add_active(struct pagevec *pvec)
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zone = pagezone;
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spin_lock_irq(&zone->lru_lock);
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}
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if (TestSetPageLRU(page))
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BUG();
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BUG_ON(PageLRU(page));
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SetPageLRU(page);
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if (TestSetPageActive(page))
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BUG();
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add_page_to_active_list(zone, page);
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20
mm/vmscan.c
20
mm/vmscan.c
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@ -1042,9 +1042,10 @@ int isolate_lru_page(struct page *page)
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if (PageLRU(page)) {
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struct zone *zone = page_zone(page);
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spin_lock_irq(&zone->lru_lock);
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if (TestClearPageLRU(page)) {
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if (PageLRU(page)) {
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ret = 1;
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get_page(page);
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ClearPageLRU(page);
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if (PageActive(page))
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del_page_from_active_list(zone, page);
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else
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@ -1085,6 +1086,8 @@ static int isolate_lru_pages(int nr_to_scan, struct list_head *src,
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page = lru_to_page(src);
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prefetchw_prev_lru_page(page, src, flags);
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BUG_ON(!PageLRU(page));
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list_del(&page->lru);
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if (unlikely(get_page_testone(page))) {
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/*
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@ -1100,8 +1103,7 @@ static int isolate_lru_pages(int nr_to_scan, struct list_head *src,
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* the page is not being freed elsewhere -- the page release
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* code relies on it.
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*/
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if (!TestClearPageLRU(page))
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BUG();
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ClearPageLRU(page);
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list_add(&page->lru, dst);
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nr_taken++;
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}
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@ -1156,8 +1158,8 @@ static void shrink_cache(struct zone *zone, struct scan_control *sc)
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*/
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while (!list_empty(&page_list)) {
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page = lru_to_page(&page_list);
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if (TestSetPageLRU(page))
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BUG();
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BUG_ON(PageLRU(page));
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SetPageLRU(page);
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list_del(&page->lru);
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if (PageActive(page))
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add_page_to_active_list(zone, page);
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@ -1276,8 +1278,8 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc)
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while (!list_empty(&l_inactive)) {
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page = lru_to_page(&l_inactive);
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prefetchw_prev_lru_page(page, &l_inactive, flags);
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if (TestSetPageLRU(page))
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BUG();
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BUG_ON(PageLRU(page));
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SetPageLRU(page);
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if (!TestClearPageActive(page))
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BUG();
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list_move(&page->lru, &zone->inactive_list);
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@ -1305,8 +1307,8 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc)
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while (!list_empty(&l_active)) {
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page = lru_to_page(&l_active);
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prefetchw_prev_lru_page(page, &l_active, flags);
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if (TestSetPageLRU(page))
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BUG();
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BUG_ON(PageLRU(page));
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SetPageLRU(page);
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BUG_ON(!PageActive(page));
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list_move(&page->lru, &zone->active_list);
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pgmoved++;
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