From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751293AbdFAUwN (ORCPT ); Thu, 1 Jun 2017 16:52:13 -0400 Received: from mail-yw0-f179.google.com ([209.85.161.179]:33112 "EHLO mail-yw0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751105AbdFAUwL (ORCPT ); Thu, 1 Jun 2017 16:52:11 -0400 Date: Thu, 1 Jun 2017 16:52:03 -0400 From: Tejun Heo To: Waiman Long Cc: Peter Zijlstra , Li Zefan , Johannes Weiner , Ingo Molnar , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, kernel-team@fb.com, pjt@google.com, luto@amacapital.net, efault@gmx.de Subject: Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Message-ID: <20170601205203.GB13390@htj.duckdns.org> References: <20170524203616.GO24798@htj.duckdns.org> <9b147a7e-fec3-3b78-7587-3890efcd42f2@redhat.com> <20170524212745.GP24798@htj.duckdns.org> <20170601145042.GA3494@htj.duckdns.org> <20170601151045.xhsv7jauejjis3mi@hirez.programming.kicks-ass.net> <20170601184740.GC3494@htj.duckdns.org> <20170601203815.GA13390@htj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.8.2 (2017-04-18) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Thu, Jun 01, 2017 at 04:48:48PM -0400, Waiman Long wrote: > I think we are on agreement here. I should we should just document how > userland can work around the internal process competition issue by > setting up the cgroup hierarchy properly. Then we can remove the no > internal process constraint. Heh, we agree on the immediate solution but not the final direction. This requirement affects how controllers implement resource control in significant ways. It is a restriction which can be worked around in userland relatively easily. I'd much prefer to keep the invariant intact. Thanks. -- tejun