Commit 5e9dace8 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Linus Torvalds
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[PATCH] mm: page_alloc less atomics 



More atomic operation removal from page allocator

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 67453911

include/linux/page-flags.h

+2 −2
Original line number Diff line number Diff line
@@ -328,8 +328,8 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta); 
#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)



#define PageCompound(page)	test_bit(PG_compound, &(page)->flags)

#define SetPageCompound(page)	set_bit(PG_compound, &(page)->flags)

#define ClearPageCompound(page)	clear_bit(PG_compound, &(page)->flags)

#define __SetPageCompound(page)	__set_bit(PG_compound, &(page)->flags)

#define __ClearPageCompound(page) __clear_bit(PG_compound, &(page)->flags)



#ifdef CONFIG_SWAP

#define PageSwapCache(page)	test_bit(PG_swapcache, &(page)->flags)

mm/page_alloc.c

+2 −2
Original line number Diff line number Diff line
@@ -190,7 +190,7 @@ static void prep_compound_page(struct page *page, unsigned long order) 
	for (i = 0; i < nr_pages; i++) {

		struct page *p = page + i;



		SetPageCompound(p);

		__SetPageCompound(p);

		set_page_private(p, (unsigned long)page);

	}

}
@@ -209,7 +209,7 @@ static void destroy_compound_page(struct page *page, unsigned long order) 
		if (unlikely(!PageCompound(p) |

				(page_private(p) != (unsigned long)page)))

			bad_page(page);

		ClearPageCompound(p);

		__ClearPageCompound(p);

	}

}