From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id C699C7DD4F for ; Fri, 12 Oct 2018 17:57:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727493AbeJMBaV (ORCPT ); Fri, 12 Oct 2018 21:30:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46090 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727051AbeJMBaT (ORCPT ); Fri, 12 Oct 2018 21:30:19 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0827D3001389; Fri, 12 Oct 2018 17:56:41 +0000 (UTC) Received: from llong.com (dhcp-17-8.bos.redhat.com [10.18.17.8]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5DF5579453; Fri, 12 Oct 2018 17:56:39 +0000 (UTC) From: Waiman Long To: Tejun Heo , Li Zefan , Johannes Weiner , Peter Zijlstra , Ingo Molnar Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kernel-team@fb.com, pjt@google.com, luto@amacapital.net, Mike Galbraith , torvalds@linux-foundation.org, Roman Gushchin , Juri Lelli , Patrick Bellasi , Waiman Long Subject: [PATCH v13 09/11] cpuset: Expose cpus.effective and mems.effective on cgroup v2 root Date: Fri, 12 Oct 2018 13:55:49 -0400 Message-Id: <1539366951-8498-10-git-send-email-longman@redhat.com> In-Reply-To: <1539366951-8498-1-git-send-email-longman@redhat.com> References: <1539366951-8498-1-git-send-email-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Fri, 12 Oct 2018 17:56:41 +0000 (UTC) Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Because of the fact that setting the "cpuset.sched.partition" in a direct child of root can remove CPUs from the root's effective CPU list, it makes sense to know what CPUs are left in the root cgroup for scheduling purpose. So the "cpuset.cpus.effective" control file is now exposed in the v2 cgroup root. For consistency, the "cpuset.mems.effective" control file is exposed as well. Signed-off-by: Waiman Long --- Documentation/admin-guide/cgroup-v2.rst | 4 ++-- kernel/cgroup/cpuset.c | 2 -- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 0465c23..533e85c 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1631,7 +1631,7 @@ Cpuset Interface Files and won't be affected by any CPU hotplug events. cpuset.cpus.effective - A read-only multiple values file which exists on non-root + A read-only multiple values file which exists on all cpuset-enabled cgroups. It lists the onlined CPUs that are actually granted to this @@ -1671,7 +1671,7 @@ Cpuset Interface Files and won't be affected by any memory nodes hotplug events. cpuset.mems.effective - A read-only multiple values file which exists on non-root + A read-only multiple values file which exists on all cpuset-enabled cgroups. It lists the onlined memory nodes that are actually granted to diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index c52074e..a3b81d4 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -2560,14 +2560,12 @@ static s64 cpuset_read_s64(struct cgroup_subsys_state *css, struct cftype *cft) .name = "cpus.effective", .seq_show = cpuset_common_seq_show, .private = FILE_EFFECTIVE_CPULIST, - .flags = CFTYPE_NOT_ON_ROOT, }, { .name = "mems.effective", .seq_show = cpuset_common_seq_show, .private = FILE_EFFECTIVE_MEMLIST, - .flags = CFTYPE_NOT_ON_ROOT, }, { -- 1.8.3.1