From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755901Ab1DZGFP (ORCPT ); Tue, 26 Apr 2011 02:05:15 -0400 Received: from mail-wy0-f174.google.com ([74.125.82.174]:44316 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754782Ab1DZGFO convert rfc822-to-8bit (ORCPT ); Tue, 26 Apr 2011 02:05:14 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=FZbuD2J0mdbFj6JxMModkRnrx43TgR3eNYIC/yxJ/mS8EcUsKl7EXpolPjIBeffwFm n61Ouwlwzl5qL6dXHc/Gs9mu0gpqPbadaUbJEpgHcBOK8b+fb7yEm+U7KEgLQ3vQ3SWD UpaKKwXFOYkrzdIOV3xAA6/mw2ZjRtGy57LPg= MIME-Version: 1.0 In-Reply-To: <20110426055521.GA18473@localhost> References: <20110426055521.GA18473@localhost> Date: Tue, 26 Apr 2011 14:05:12 +0800 Message-ID: Subject: Re: readahead and oom From: Dave Young To: Wu Fengguang Cc: linux-mm , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 26, 2011 at 1:55 PM, Wu Fengguang wrote: > On Tue, Apr 26, 2011 at 01:49:25PM +0800, Dave Young wrote: >> Hi, >> >> When memory pressure is high, readahead could cause oom killing. >> IMHO we should stop readaheading under such circumstances。If it's true >> how to fix it? > > Good question. Before OOM there will be readahead thrashings, which > can be addressed by this patch: > > http://lkml.org/lkml/2010/2/2/229 Hi, I'm not clear about the patch, could be regard as below cases? 1) readahead alloc fail due to low memory such as other large allocation 2) readahead thrashing caused by itself > > However there seems no much interest on that feature.. I can separate > that out and resubmit it standalone if necessary. > > Thanks, > Fengguang > -- Regards dave