Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753237Ab0AUP34 (ORCPT ); Thu, 21 Jan 2010 10:29:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752731Ab0AUP3z (ORCPT ); Thu, 21 Jan 2010 10:29:55 -0500 Received: from e23smtp07.au.ibm.com ([202.81.31.140]:44955 "EHLO e23smtp07.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752428Ab0AUP3y (ORCPT ); Thu, 21 Jan 2010 10:29:54 -0500 Message-ID: <4B5872EC.5040603@linux.vnet.ibm.com> Date: Thu, 21 Jan 2010 20:59:48 +0530 From: Balbir Singh Reply-To: balbir@linux.vnet.ibm.com User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091209 Fedora/3.0-4.fc12 Lightning/1.0b1 Thunderbird/3.0 MIME-Version: 1.0 To: KAMEZAWA Hiroyuki CC: "linux-mm@kvack.org" , "akpm@linux-foundation.org" , rientjes@google.com, minchan.kim@gmail.com, "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] oom-kill: add lowmem usage aware oom kill handling References: <20100121145905.84a362bb.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20100121145905.84a362bb.kamezawa.hiroyu@jp.fujitsu.com> X-Enigmail-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1228 Lines: 31 On Thursday 21 January 2010 11:29 AM, KAMEZAWA Hiroyuki wrote: > A patch for avoiding oom-serial-killer at lowmem shortage. > Patch is onto mmotm-2010/01/15 (depends on mm-count-lowmem-rss.patch) > Tested on x86-64/SMP + debug module(to allocated lowmem), works well. > > == > From: KAMEZAWA Hiroyuki > > One cause of OOM-Killer is memory shortage in lower zones. > (If memory is enough, lowmem_reserve_ratio works well. but..) > > In lowmem-shortage oom-kill, oom-killer choses a vicitim process > on their vm size. But this kills a process which has lowmem memory > only if it's lucky. At last, there will be an oom-serial-killer. > > Now, we have per-mm lowmem usage counter. We can make use of it > to select a good? victim. Have you seen any use cases that need this change? Or is it mostly via code review and to utilize the availability of lowmem rss? Do we often run into lowmem shortage triggering OOM? -- Three Cheers, Balbir Singh -- 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/