Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756022Ab1DZGHU (ORCPT ); Tue, 26 Apr 2011 02:07:20 -0400 Received: from mail-ww0-f44.google.com ([74.125.82.44]:50514 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754351Ab1DZGHS convert rfc822-to-8bit (ORCPT ); Tue, 26 Apr 2011 02:07:18 -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=bZ9yya1GQgH4nIMniiBEmUrClDMG+pejix+os7zHaZjnO0nmOd+0liLF9J42mCVPpv cJnR+aIXNLpC021v7pqqKwxK8k2wW0rSbYL7Y5/ayhznUfebo8uwqQhMeDRxsklizylR IiazMBB5wbvf2WJY4YTXx3lK9JJfPed9NRL+g= MIME-Version: 1.0 In-Reply-To: References: <20110426055521.GA18473@localhost> Date: Tue, 26 Apr 2011 14:07:17 +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 Content-Length: 1293 Lines: 47 On Tue, Apr 26, 2011 at 2:05 PM, Dave Young wrote: > 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 For example vm balloon allocate lots of memory, then readahead could fail immediately and then oom > 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 > -- Regards dave -- 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/