Commit f205b2fe authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Linus Torvalds
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[PATCH] mm: slab less atomics 



Atomic operation removal from slab

Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 5e9dace8

include/linux/page-flags.h

+2 −4
Original line number Diff line number Diff line
@@ -250,10 +250,8 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta); 
#define __ClearPageActive(page)	__clear_bit(PG_active, &(page)->flags)



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

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

#define ClearPageSlab(page)	clear_bit(PG_slab, &(page)->flags)

#define TestClearPageSlab(page)	test_and_clear_bit(PG_slab, &(page)->flags)

#define TestSetPageSlab(page)	test_and_set_bit(PG_slab, &(page)->flags)

#define __SetPageSlab(page)	__set_bit(PG_slab, &(page)->flags)

#define __ClearPageSlab(page)	__clear_bit(PG_slab, &(page)->flags)



#ifdef CONFIG_HIGHMEM

#define PageHighMem(page)	is_highmem(page_zone(page))

mm/slab.c

+3 −3
Original line number Diff line number Diff line
@@ -1402,7 +1402,7 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) 
		atomic_add(i, &slab_reclaim_pages);

	add_page_state(nr_slab, i);

	while (i--) {

		SetPageSlab(page);

		__SetPageSlab(page);

		page++;

	}

	return addr;
@@ -1418,8 +1418,8 @@ static void kmem_freepages(struct kmem_cache *cachep, void *addr) 
	const unsigned long nr_freed = i;



	while (i--) {

		if (!TestClearPageSlab(page))

			BUG();

		BUG_ON(!PageSlab(page));

		__ClearPageSlab(page);

		page++;

	}

	sub_page_state(nr_slab, nr_freed);