From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752673AbcGAIYu (ORCPT ); Fri, 1 Jul 2016 04:24:50 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:46590 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752138AbcGAIYq (ORCPT ); Fri, 1 Jul 2016 04:24:46 -0400 Date: Fri, 1 Jul 2016 10:24:42 +0200 From: Peter Zijlstra To: Jiri Olsa Cc: Jiri Olsa , Ingo Molnar , lkml , James Hartsock , Rik van Riel , Srivatsa Vaddagiri , Kirill Tkhai Subject: Re: [PATCH 3/4] sched/fair: Add REBALANCE_AFFINITY rebalancing code Message-ID: <20160701082442.GO30921@twins.programming.kicks-ass.net> References: <1466424914-8981-1-git-send-email-jolsa@kernel.org> <1466424914-8981-4-git-send-email-jolsa@kernel.org> <20160630105805.GC30154@twins.programming.kicks-ass.net> <20160701073546.GA13901@krava> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160701073546.GA13901@krava> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 01, 2016 at 09:35:46AM +0200, Jiri Olsa wrote: > well this is issue our partner met in the setup, > and I'm not sure what was their motivation for that, > perhaps James could clarify in here.. > > I tried to make the 'scratch that itch' solution as > mentioned in earlier discussion. > > So IIUIC what you say is that it needs to be more generic > solution..? I'll continue staring at it then ;-) I just want to know what problem we're trying to solve.. Because it appears this is running 1 task each on a 'weird' subset of cpus and things going badly. If this really is the case, then teaching active balance to only move tasks to idle cpus or something should also cure things. Also, I'm curious why people set such weird masks.