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Message-Id: <1268048904-19397-3-git-send-email-mel@csn.ul.ie> Date: Mon, 8 Mar 2010 11:48:22 +0000 From: Mel Gorman <mel@....ul.ie> To: linux-mm@...ck.org Cc: Nick Piggin <npiggin@...e.de>, Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>, Chris Mason <chris.mason@...cle.com>, Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie> Subject: [PATCH 2/3] page-allocator: Check zone pressure when batch of pages are freed When a batch of pages have been freed to the buddy allocator, it is possible that it is enough to push a zone above its watermarks. This patch puts a check in the free path for zone pressure. It's in a common path but for the most part, it should only be checking if a linked list is empty and have minimal performance impact. Signed-off-by: Mel Gorman <mel@....ul.ie> --- mm/page_alloc.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 1383ff9..3c8e8b7 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -562,6 +562,9 @@ static void free_pcppages_bulk(struct zone *zone, int count, } while (--count && --batch_free && !list_empty(list)); } spin_unlock(&zone->lock); + + /* A batch of pages have been freed so check zone pressure */ + check_zone_pressure(zone); } static void free_one_page(struct zone *zone, struct page *page, int order, -- 1.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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