Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753588Ab0DOEPZ (ORCPT ); Thu, 15 Apr 2010 00:15:25 -0400 Received: from fgwmail7.fujitsu.co.jp ([192.51.44.37]:40004 "EHLO fgwmail7.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753534Ab0DOEPV (ORCPT ); Thu, 15 Apr 2010 00:15:21 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: KOSAKI Motohiro Subject: [PATCH 4/4] vmscan: delegate page cleaning io to flusher thread if VM pressure is low Cc: kosaki.motohiro@jp.fujitsu.com, Dave Chinner , Mel Gorman , Chris Mason , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org In-Reply-To: <20100415130212.D16E.A69D9226@jp.fujitsu.com> References: <20100415013436.GO2493@dastard> <20100415130212.D16E.A69D9226@jp.fujitsu.com> Message-Id: <20100415131420.D17D.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Thu, 15 Apr 2010 13:15:11 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1005 Lines: 36 Even if pageout() is called from direct reclaim, we can delegate io to flusher thread if vm pressure is low. Signed-off-by: KOSAKI Motohiro --- mm/vmscan.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 8b78b49..eab6028 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -623,6 +623,13 @@ static enum page_references page_check_references(struct page *page, if (current_is_kswapd()) return PAGEREF_RECLAIM_CLEAN; + /* + * Now VM pressure is not so high. then we can delegate + * page cleaning to flusher thread safely. + */ + if (!sc->order && sc->priority > DEF_PRIORITY/2) + return PAGEREF_RECLAIM_CLEAN; + return PAGEREF_RECLAIM; } -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/