From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752901AbcEMOBd (ORCPT ); Fri, 13 May 2016 10:01:33 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:35895 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751407AbcEMOBb (ORCPT ); Fri, 13 May 2016 10:01:31 -0400 Date: Fri, 13 May 2016 16:01:28 +0200 From: Michal Hocko To: Mason Cc: Sebastian Frias , linux-mm@kvack.org, Andrew Morton , Linus Torvalds , LKML Subject: Re: [PATCH] mm: add config option to select the initial overcommit mode Message-ID: <20160513140128.GQ20141@dhcp22.suse.cz> References: <5731CC6E.3080807@laposte.net> <20160513080458.GF20141@dhcp22.suse.cz> <573593EE.6010502@free.fr> <20160513095230.GI20141@dhcp22.suse.cz> <5735AA0E.5060605@free.fr> <20160513114429.GJ20141@dhcp22.suse.cz> <5735C567.6030202@free.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5735C567.6030202@free.fr> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri 13-05-16 14:15:35, Mason wrote: > On 13/05/2016 13:44, Michal Hocko wrote: > > > Anyway, this is my laptop where I do not run anything really special > > (xfce, browser, few consoles, git, mutt): > > $ grep Commit /proc/meminfo > > CommitLimit: 3497288 kB > > Committed_AS: 3560804 kB > > > > I am running with the default overcommit setup so I do not care about > > the limit but the Committed_AS will tell you how much is actually > > committed. I am definitelly not out of memory: > > $ free > > total used free shared buff/cache available > > Mem: 3922584 1724120 217336 105264 1981128 2036164 > > Swap: 1535996 386364 1149632 > > I see. Thanks for the data point. > > I had a different type of system in mind. > 256 to 512 MB of RAM, no swap. > Perhaps Sebastian's choice could be made to depend on CONFIG_EMBEDDED, > rather than CONFIG_EXPERT? Even if the overcommit behavior is different on those systems the primary question hasn't been answered yet. Why cannot this be done from the userspace? In other words what wouldn't work properly? -- Michal Hocko SUSE Labs