From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id CE4BA6B0089 for ; Mon, 16 Mar 2009 13:51:39 -0400 (EDT) From: Mel Gorman Subject: [PATCH 23/27] Update NR_FREE_PAGES only as necessary Date: Mon, 16 Mar 2009 17:53:37 +0000 Message-Id: <1237226020-14057-24-git-send-email-mel@csn.ul.ie> In-Reply-To: <1237226020-14057-1-git-send-email-mel@csn.ul.ie> References: <1237226020-14057-1-git-send-email-mel@csn.ul.ie> Sender: owner-linux-mm@kvack.org To: Mel Gorman , Linux Memory Management List Cc: Pekka Enberg , Rik van Riel , KOSAKI Motohiro , Christoph Lameter , Johannes Weiner , Nick Piggin , Linux Kernel Mailing List , Lin Ming , Zhang Yanmin , Peter Zijlstra List-ID: When pages are being freed to the buddy allocator, the zone NR_FREE_PAGES counter must be updated. In the case of bulk per-cpu page freeing, it's updated once per page. This retouches cache lines more than necessary. Update the counters one per per-cpu bulk free. Signed-off-by: Mel Gorman Reviewed-by: Christoph Lameter --- mm/page_alloc.c | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 21affd4..98ce091 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -460,7 +460,6 @@ static inline void __free_one_page(struct page *page, int migratetype) { unsigned long page_idx; - int order_size = 1 << order; if (unlikely(PageCompound(page))) if (unlikely(destroy_compound_page(page, order))) @@ -470,10 +469,9 @@ static inline void __free_one_page(struct page *page, page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1); - VM_BUG_ON(page_idx & (order_size - 1)); + VM_BUG_ON(page_idx & ((1 << order) - 1)); VM_BUG_ON(bad_range(zone, page)); - __mod_zone_page_state(zone, NR_FREE_PAGES, order_size); while (order < MAX_ORDER-1) { unsigned long combined_idx; struct page *buddy; @@ -528,6 +526,8 @@ static void free_pages_bulk(struct zone *zone, int count, spin_lock(&zone->lock); zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE); zone->pages_scanned = 0; + + __mod_zone_page_state(zone, NR_FREE_PAGES, count); while (count--) { struct page *page; @@ -546,6 +546,8 @@ static void free_one_page(struct zone *zone, struct page *page, int order, spin_lock(&zone->lock); zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE); zone->pages_scanned = 0; + + __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order); __free_one_page(page, zone, order, migratetype); spin_unlock(&zone->lock); } @@ -690,7 +692,6 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, list_del(&page->lru); rmv_page_order(page); area->nr_free--; - __mod_zone_page_state(zone, NR_FREE_PAGES, - (1UL << order)); expand(zone, page, order, current_order, area, migratetype); return page; } @@ -830,8 +831,6 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype) /* Remove the page from the freelists */ list_del(&page->lru); rmv_page_order(page); - __mod_zone_page_state(zone, NR_FREE_PAGES, - -(1UL << order)); if (current_order == pageblock_order) set_pageblock_migratetype(page, @@ -905,6 +904,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order, set_page_private(page, migratetype); list = &page->lru; } + __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); spin_unlock(&zone->lock); return i; } -- 1.5.6.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org