From: Christoph Lameter Free one_page currently adds the page to a fake list and calls free_page_bulk. Fee_page_bulk takes it off again and then calles __free_one_page. Make free_one_page go directly to __free_one_page. Saves list on / off and a temporary list in free_one_page for higher ordered pages. Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton --- mm/page_alloc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff -puN mm/page_alloc.c~optimize-free_one_page mm/page_alloc.c --- a/mm/page_alloc.c~optimize-free_one_page +++ a/mm/page_alloc.c @@ -448,9 +448,11 @@ static void free_pages_bulk(struct zone static void free_one_page(struct zone *zone, struct page *page, int order) { - LIST_HEAD(list); - list_add(&page->lru, &list); - free_pages_bulk(zone, 1, &list, order); + spin_lock(&zone->lock); + zone->all_unreclaimable = 0; + zone->pages_scanned = 0; + __free_one_page(page, zone ,order); + spin_unlock(&zone->lock); } static void __free_pages_ok(struct page *page, unsigned int order) _