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=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 BEE9AC48BD1 for ; Thu, 10 Jun 2021 14:20:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE1E4613D9 for ; Thu, 10 Jun 2021 14:20:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231341AbhFJOWI (ORCPT ); Thu, 10 Jun 2021 10:22:08 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:41182 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231336AbhFJOWG (ORCPT ); Thu, 10 Jun 2021 10:22:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623334810; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=vPeoXcqrS3MIzkBmzsxPXiPd+AVSGxxS032+qPVyFQc=; b=T6qdBr3FPLk20HMihxZe2RAAurUjN3YdouD4OHt5s7i1lfUAxBlGQivFhGG47hnZMX4Zer OFCWpWLy8SJDw4kkbAgyvdGLS103JyusaOpgfxVYMEO/knyRLfn/UgtHcybC81Sk+1Ijw6 WW4cl0Ki/moQI7j6GLTXqsqFrY+e94U= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-59-4Iz9mnYoM26GMVnPmhD8sw-1; Thu, 10 Jun 2021 10:20:06 -0400 X-MC-Unique: 4Iz9mnYoM26GMVnPmhD8sw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id EB3378030A0; Thu, 10 Jun 2021 14:20:01 +0000 (UTC) Received: from lorien.usersys.redhat.com (unknown [10.22.8.122]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 95DAB60C5E; Thu, 10 Jun 2021 14:19:49 +0000 (UTC) Date: Thu, 10 Jun 2021 10:19:47 -0400 From: Phil Auld To: Waiman Long Cc: Tejun Heo , Zefan Li , Johannes Weiner , Jonathan Corbet , Shuah Khan , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Andrew Morton , Roman Gushchin , Peter Zijlstra , Juri Lelli Subject: Re: [PATCH 0/5] cgroup/cpuset: Enable cpuset partition with no load balancing Message-ID: References: <20210603212416.25934-1-longman@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210603212416.25934-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Waiman, On Thu, Jun 03, 2021 at 05:24:11PM -0400 Waiman Long wrote: > This patchset makes the following two major changes to the cpuset v2 code: > > Patch 2: Add a new partition state "root-nolb" to create a partition > root with load balancing disabled. This is for handling intermitten > workloads that have a strict low latency requirement. > > Patch 3: Allow partition roots that are not the top cpuset to distribute > all its cpus to child partitions as long as there is no task associated > with that partition root. This allows more flexibility for middleware > to manage multiple partitions. Thanks! This looks like it will be a usable replacement for the functionality lost when SD_LOAD_BALANCE went away. Cheers, Phil > > Patch 4 updates the cgroup-v2.rst file accordingly. Patch 5 adds a test > to test the new cpuset partition code. > > Waiman Long (5): > cgroup/cpuset: Don't call validate_change() for some flag changes > cgroup/cpuset: Add new cpus.partition type with no load balancing > cgroup/cpuset: Allow non-top parent partition root to distribute out > all CPUs > cgroup/cpuset: Update description of cpuset.cpus.partition in > cgroup-v2.rst > kselftest/cgroup: Add cpuset v2 partition root state test > > Documentation/admin-guide/cgroup-v2.rst | 19 ++- > kernel/cgroup/cpuset.c | 124 +++++++++++---- > tools/testing/selftests/cgroup/Makefile | 2 +- > .../selftests/cgroup/test_cpuset_prs.sh | 141 ++++++++++++++++++ > 4 files changed, 247 insertions(+), 39 deletions(-) > create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh > > -- > 2.18.1 > --