From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754214Ab1KST43 (ORCPT ); Sat, 19 Nov 2011 14:56:29 -0500 Received: from mx1.redhat.com ([209.132.183.28]:64244 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753021Ab1KSTzG (ORCPT ); Sat, 19 Nov 2011 14:55:06 -0500 From: Andrea Arcangeli To: linux-mm@kvack.org Cc: Mel Gorman , Minchan Kim , Jan Kara , Andy Isaacson , Johannes Weiner , linux-kernel@vger.kernel.org Subject: [PATCH 1/8] mm: compaction: Allow compaction to isolate dirty pages Date: Sat, 19 Nov 2011 20:54:13 +0100 Message-Id: <1321732460-14155-2-git-send-email-aarcange@redhat.com> In-Reply-To: <1321635524-8586-1-git-send-email-mgorman@suse.de> References: <1321635524-8586-1-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mel Gorman Commit [39deaf85: mm: compaction: make isolate_lru_page() filter-aware] noted that compaction does not migrate dirty or writeback pages and that is was meaningless to pick the page and re-add it to the LRU list. What was missed during review is that asynchronous migration moves dirty pages if their ->migratepage callback is migrate_page() because these can be moved without blocking. This potentially impacted hugepage allocation success rates by a factor depending on how many dirty pages are in the system. This patch partially reverts 39deaf85 to allow migration to isolate dirty pages again. This increases how much compaction disrupts the LRU but that is addressed later in the series. Signed-off-by: Mel Gorman Signed-off-by: Andrea Arcangeli --- mm/compaction.c | 3 --- 1 files changed, 0 insertions(+), 3 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index 899d956..237560e 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -349,9 +349,6 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, continue; } - if (!cc->sync) - mode |= ISOLATE_CLEAN; - /* Try isolate the page */ if (__isolate_lru_page(page, mode, 0) != 0) continue;