From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751593AbbJLIsM (ORCPT ); Mon, 12 Oct 2015 04:48:12 -0400 Received: from mail-wi0-f169.google.com ([209.85.212.169]:38320 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751481AbbJLIsK (ORCPT ); Mon, 12 Oct 2015 04:48:10 -0400 Message-ID: <1444639687.3425.39.camel@gmail.com> Subject: Re: 4.3 group scheduling regression From: Mike Galbraith To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Yuyang Du Date: Mon, 12 Oct 2015 10:48:07 +0200 In-Reply-To: <20151012080407.GJ3816@twins.programming.kicks-ass.net> References: <1444292390.3389.100.camel@gmail.com> <201510081054.t98AsL1U003456@como.maths.usyd.edu.au> <20151008111959.GM3816@twins.programming.kicks-ass.net> <1444483369.2804.9.camel@gmail.com> <20151010170142.GI3816@twins.programming.kicks-ass.net> <1444530318.3363.40.camel@gmail.com> <1444585321.4169.18.camel@gmail.com> <20151012072344.GM3604@twins.programming.kicks-ass.net> <1444635897.3425.19.camel@gmail.com> <20151012080407.GJ3816@twins.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2015-10-12 at 10:04 +0200, Peter Zijlstra wrote: > On Mon, Oct 12, 2015 at 09:44:57AM +0200, Mike Galbraith wrote: > > > It's odd to me that things look pretty much the same good/bad tree with > > hogs vs hogs or hogs vs tbench (with top anyway, just adding up times). > > Seems Xorg+mplayer more or less playing cross group ping-pong must be > > the BadThing trigger. > > Ohh, wait, Xorg and mplayer are _not_ in the same group? I was assuming > you had your entire user session in 1 (auto) group and was competing > against 8 manual cgroups. > > So how exactly are things configured? I turned autogroup on as to not have to muck about creating groups, so Xorg is in its per session group, and each konsole instance in its. I launched groups via testo (aka konsole) -e in a little script to turn it loose at once to run for 100 seconds and kill itself, but that's not necessary 'course. Start 1 hog in 8 konsole tabs, and mplayer in the 9th, ickiness follows. -Mike