From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751538AbaKIJf1 (ORCPT ); Sun, 9 Nov 2014 04:35:27 -0500 Received: from cantor2.suse.de ([195.135.220.15]:45690 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751138AbaKIJfW (ORCPT ); Sun, 9 Nov 2014 04:35:22 -0500 Message-ID: <545F3556.5000802@suse.cz> Date: Sun, 09 Nov 2014 10:35:18 +0100 From: Vlastimil Babka User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: "P. Christeas" , Hillf Danton , linux-kernel CC: linux-mm@kvack.org Subject: Re: Early test: hangs in mm/compact.c w. Linus's 12d7aacab56e9ef185c References: <00a801cffbd8$434189b0$c9c49d10$@alibaba-inc.com> <1433036.WjB5pb09Zh@xorhgos3.pefnos> In-Reply-To: <1433036.WjB5pb09Zh@xorhgos3.pefnos> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/09/2014 09:22 AM, P. Christeas wrote: > On Sunday 09 November 2014, Hillf Danton wrote: >> - return COMPACT_CONTINUE; >> + return COMPACT_SKIPPED; > > I guess this one would mitigate against Vlastmil's migration scanner issue, > wouldn't it? Please no, that's a wrong fix. The purpose of compaction is to make the high-order watermark meet, not give up. > In that case, I should wait a bit[1] to try the first patch, then revert, try > yours and (hopefully) have some results. I hope my patch will be enough, > Then, apply both. > > [1] trying to push the vm by loading memory-hungry apps and random load. Maybe the tools/testing/selftests/vm/transhuge-stress could help