Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754720Ab1EaNj4 (ORCPT ); Tue, 31 May 2011 09:39:56 -0400 Received: from zene.cmpxchg.org ([85.214.230.12]:37833 "EHLO zene.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751079Ab1EaNjz (ORCPT ); Tue, 31 May 2011 09:39:55 -0400 Date: Tue, 31 May 2011 15:39:50 +0200 From: Johannes Weiner To: Minchan Kim Cc: Andrew Morton , linux-mm , LKML , KAMEZAWA Hiroyuki , KOSAKI Motohiro , Mel Gorman , Rik van Riel , Andrea Arcangeli Subject: Re: [PATCH v2 04/10] Add additional isolation mode Message-ID: <20110531133950.GA4594@cmpxchg.org> References: <5b0f0be7ee441ea27ffcad81d2637ac09407acf3.1306689214.git.minchan.kim@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5b0f0be7ee441ea27ffcad81d2637ac09407acf3.1306689214.git.minchan.kim@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1327 Lines: 30 On Mon, May 30, 2011 at 03:13:43AM +0900, Minchan Kim wrote: > There are some places to isolate lru page and I believe > users of isolate_lru_page will be growing. > The purpose of them is each different so part of isolated pages > should put back to LRU, again. > > The problem is when we put back the page into LRU, > we lose LRU ordering and the page is inserted at head of LRU list. > It makes unnecessary LRU churning so that vm can evict working set pages > rather than idle pages. > > This patch adds new modes when we isolate page in LRU so we don't isolate pages > if we can't handle it. It could reduce LRU churning. > > This patch doesn't change old behavior. It's just used by next patches. > > Cc: KOSAKI Motohiro > Cc: Mel Gorman > Cc: Rik van Riel > Cc: Andrea Arcangeli > Cc: Johannes Weiner > Cc: KAMEZAWA Hiroyuki > Signed-off-by: Minchan Kim Acked-by: Johannes Weiner -- 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/