From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753462Ab3F0Oxx (ORCPT ); Thu, 27 Jun 2013 10:53:53 -0400 Received: from merlin.infradead.org ([205.233.59.134]:59319 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751569Ab3F0Oxw (ORCPT ); Thu, 27 Jun 2013 10:53:52 -0400 Date: Thu, 27 Jun 2013 16:53:45 +0200 From: Peter Zijlstra To: Mel Gorman Cc: Ingo Molnar , Andrea Arcangeli , Johannes Weiner , Linux-MM , LKML Subject: Re: [PATCH 5/8] sched: Favour moving tasks towards the preferred node Message-ID: <20130627145345.GT28407@twins.programming.kicks-ass.net> References: <1372257487-9749-1-git-send-email-mgorman@suse.de> <1372257487-9749-6-git-send-email-mgorman@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1372257487-9749-6-git-send-email-mgorman@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 Wed, Jun 26, 2013 at 03:38:04PM +0100, Mel Gorman wrote: > This patch favours moving tasks towards the preferred NUMA node when > it has just been selected. Ideally this is self-reinforcing as the > longer the the task runs on that node, the more faults it should incur > causing task_numa_placement to keep the task running on that node. In > reality a big weakness is that the nodes CPUs can be overloaded and it > would be more effficient to queue tasks on an idle node and migrate to > the new node. This would require additional smarts in the balancer so > for now the balancer will simply prefer to place the task on the > preferred node for a tunable number of PTE scans. This changelog fails to mention why you're adding the settle stuff in this patch.