From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932787Ab3GLKPB (ORCPT ); Fri, 12 Jul 2013 06:15:01 -0400 Received: from merlin.infradead.org ([205.233.59.134]:60426 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932111Ab3GLKPA (ORCPT ); Fri, 12 Jul 2013 06:15:00 -0400 Date: Fri, 12 Jul 2013 12:14:08 +0200 From: Peter Zijlstra To: Mel Gorman Cc: Srikar Dronamraju , Ingo Molnar , Andrea Arcangeli , Johannes Weiner , Linux-MM , LKML Subject: Re: [PATCH 08/16] sched: Reschedule task on preferred NUMA node once selected Message-ID: <20130712101408.GV25631@dyad.programming.kicks-ass.net> References: <1373536020-2799-1-git-send-email-mgorman@suse.de> <1373536020-2799-9-git-send-email-mgorman@suse.de> <20130711123038.GH25631@dyad.programming.kicks-ass.net> <20130711130322.GC2355@suse.de> <20130711131158.GJ25631@dyad.programming.kicks-ass.net> <20130711140914.GE2355@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130711140914.GE2355@suse.de> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 11, 2013 at 03:09:14PM +0100, Mel Gorman wrote: > That might be necessary when the machine is overloaded. As a > starting point the following should retry the migrate a number of times > until success. The retry is checked on every fault but should not fire > more than once every 100ms. Yeah, something like that might work. But getting a working imbalance bound is important. The current very weak direct migration is the only thing that keeps the system from massively skewing load.