From f45840b5c128445da70e7ec33adc47b4a12bdaf4 Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Sat, 18 Oct 2008 20:26:57 -0700 Subject: mm: pagecache insertion fewer atomics Setting and clearing the page locked when inserting it into swapcache / pagecache when it has no other references can use non-atomic page flags operations because no other CPU may be operating on it at this time. This saves one atomic operation when inserting a page into pagecache. Signed-off-by: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/swap_state.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'mm/swap_state.c') diff --git a/mm/swap_state.c b/mm/swap_state.c index 43cda7b4b808..3353c9029cef 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -303,7 +303,7 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, * re-using the just freed swap entry for an existing page. * May fail (-ENOMEM) if radix-tree node allocation failed. */ - set_page_locked(new_page); + __set_page_locked(new_page); SetPageSwapBacked(new_page); err = add_to_swap_cache(new_page, entry, gfp_mask & GFP_KERNEL); if (likely(!err)) { @@ -315,7 +315,7 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, return new_page; } ClearPageSwapBacked(new_page); - clear_page_locked(new_page); + __clear_page_locked(new_page); swap_free(entry); } while (err != -ENOMEM); -- cgit v1.2.3-58-ga151