From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C93DC04AAF for ; Tue, 21 May 2019 14:34:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0BE3A21773 for ; Tue, 21 May 2019 14:34:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728248AbfEUOeR (ORCPT ); Tue, 21 May 2019 10:34:17 -0400 Received: from mx2.suse.de ([195.135.220.15]:38094 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726900AbfEUOeR (ORCPT ); Tue, 21 May 2019 10:34:17 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id E3E03AF3F; Tue, 21 May 2019 14:34:15 +0000 (UTC) Date: Tue, 21 May 2019 16:34:14 +0200 From: Michal =?iso-8859-1?Q?Koutn=FD?= To: Joel Savitz Cc: linux-kernel@vger.kernel.org, Li Zefan , Tejun Heo , Waiman Long , Phil Auld , cgroups@vger.kernel.org Subject: Re: [PATCH v2] cpuset: restore sanity to cpuset_cpus_allowed_fallback() Message-ID: <20190521143414.GJ5307@blackbody.suse.cz> References: <20190409204003.6428-1-jsavitz@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190409204003.6428-1-jsavitz@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 09, 2019 at 04:40:03PM -0400, Joel Savitz wrote: > $ grep Cpus /proc/$$/status > Cpus_allowed: ff > Cpus_allowed_list: 0-7 (a) > $ taskset -p 4 $$ > pid 19202's current affinity mask: f > pid 19202's new affinity mask: 4 > > $ grep Cpus /proc/self/status > Cpus_allowed: 04 > Cpus_allowed_list: 2 > > # echo off > /sys/devices/system/cpu/cpu2/online > $ grep Cpus /proc/$$/status > Cpus_allowed: 0b > Cpus_allowed_list: 0-1,3 I'm confused where this value comes from, I must be missing something. Joel, is the task in question put into a cpuset with 0xf CPUs only (at point (a))? Or are the CPUs 4-7 offlined as well? Thanks, Michal