Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932591AbbHYKBL (ORCPT ); Tue, 25 Aug 2015 06:01:11 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:58006 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932506AbbHYKBI (ORCPT ); Tue, 25 Aug 2015 06:01:08 -0400 Date: Tue, 25 Aug 2015 12:00:54 +0200 From: Peter Zijlstra To: Ingo Molnar Cc: Paul Turner , Tejun Heo , Austin S Hemmelgarn , Ingo Molnar , Johannes Weiner , lizefan@huawei.com, cgroups , LKML , kernel-team , Linus Torvalds , Andrew Morton Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Message-ID: <20150825100054.GN16853@twins.programming.kicks-ass.net> References: <20150824210223.GH28944@mtj.duckdns.org> <20150824211707.GJ28944@mtj.duckdns.org> <20150824214000.GL28944@mtj.duckdns.org> <20150824224936.GO28944@mtj.duckdns.org> <20150825092441.GA24131@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150825092441.GA24131@gmail.com> 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 Content-Length: 1631 Lines: 45 On Tue, Aug 25, 2015 at 11:24:42AM +0200, Ingo Molnar wrote: > > * Paul Turner wrote: > > > > Anyways, a point here is that threads of the same process competing > > > isn't a new problem. There are many ways to make those threads play > > > nice as the application itself often has to be involved anyway, > > > especially for something like qemu which is heavily involved in > > > provisioning resources. > > > > It's certainly not a new problem, but it's a real one, and it's > > _hard_. You're proposing removing the best known solution. > > Also, just to make sure this is resolved properly, I'm NAK-ing the current > scheduler bits in this series: > > NAKed-by: Ingo Molnar > > until all of pjt's API design concerns are resolved. This is conceptual, it is not > a 'we can fix it later' detail. > > Tejun, please keep me Cc:-ed to future versions of this series so that I can lift > the NAK if things get resolved. You can add: NAKed-by: Peter Zijlstra to that. There have been at least 3 different groups of people: - Mike, representing Suse customers - Kamezawa-san, representing Fujitsu customers - Paul, representing Google that claim per-thread control groups are in use and important. Any replacement _must_ provide for this use case up front; its not something that can be cobbled on later. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/