From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx112.postini.com [74.125.245.112]) by kanga.kvack.org (Postfix) with SMTP id 41E966B0036 for ; Wed, 5 Jun 2013 11:10:46 -0400 (EDT) From: Andrea Arcangeli Subject: [PATCH 5/7] mm: compaction: increase the high order pages in the watermarks Date: Wed, 5 Jun 2013 17:10:35 +0200 Message-Id: <1370445037-24144-6-git-send-email-aarcange@redhat.com> In-Reply-To: <1370445037-24144-1-git-send-email-aarcange@redhat.com> References: <1370445037-24144-1-git-send-email-aarcange@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Mel Gorman , Rik van Riel , Hugh Dickins , Richard Davies , Shaohua Li , Rafael Aquini Require more high order pages in the watermarks, to give more margin for concurrent allocations. If there are too few pages, they can disappear too soon. Signed-off-by: Andrea Arcangeli --- mm/page_alloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 3931d16..c13e062 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1646,7 +1646,8 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark, free_pages -= z->free_area[o].nr_free << o; /* Require fewer higher order pages to be free */ - min >>= 1; + if (o >= pageblock_order-1) + min >>= 1; if (free_pages <= min) return false; -- 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