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Subject[patch 3/6] mm: PageActive no testset
Date
PG_active is protected by zone->lru_lock, it does not need TestSet/TestClear
operations.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c
+++ linux-2.6/mm/vmscan.c
@@ -1011,8 +1011,9 @@ refill_inactive_zone(struct zone *zone,
prefetchw_prev_lru_page(page, &l_inactive, flags);
BUG_ON(PageLRU(page));
SetPageLRU(page);
- if (!TestClearPageActive(page))
- BUG();
+ BUG_ON(!PageActive(page));
+ ClearPageActive(page);
+
list_move(&page->lru, &zone->inactive_list);
pgmoved++;
if (!pagevec_add(&pvec, page)) {
Index: linux-2.6/mm/swap.c
===================================================================
--- linux-2.6.orig/mm/swap.c
+++ linux-2.6/mm/swap.c
@@ -364,8 +364,8 @@ void __pagevec_lru_add_active(struct pag
}
BUG_ON(PageLRU(page));
SetPageLRU(page);
- if (TestSetPageActive(page))
- BUG();
+ BUG_ON(PageActive(page));
+ SetPageActive(page);
add_page_to_active_list(zone, page);
}
if (zone)
Index: linux-2.6/include/linux/page-flags.h
===================================================================
--- linux-2.6.orig/include/linux/page-flags.h
+++ linux-2.6/include/linux/page-flags.h
@@ -251,8 +251,6 @@ extern void __mod_page_state_offset(unsi
#define PageActive(page) test_bit(PG_active, &(page)->flags)
#define SetPageActive(page) set_bit(PG_active, &(page)->flags)
#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags)
-#define TestClearPageActive(page) test_and_clear_bit(PG_active, &(page)->flags)
-#define TestSetPageActive(page) test_and_set_bit(PG_active, &(page)->flags)

#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
#define SetPageSlab(page) set_bit(PG_slab, &(page)->flags)
-
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