Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 26 Mar 2020 15:20:35 -0400
From:   Tejun Heo <tj@kernel.org>
To:     "Joel Fernandes (Google)" <joel@joelfernandes.org>
Cc:     linux-kernel@vger.kernel.org, Dmitry Shmidt <dimitrysh@google.com>,
        Amit Pundir <amit.pundir@linaro.org>, kernel-team@android.com,
        jsbarnes@google.com, sonnyrao@google.com, vpillai@digitalocean.com,
        peterz@infradead.org, Guenter Roeck <groeck@chromium.org>,
        Waiman Long <longman@redhat.com>,
        Greg Kerr <kerrnel@google.com>, cgroups@vger.kernel.org,
        Johannes Weiner <hannes@cmpxchg.org>,
        Li Zefan <lizefan@huawei.com>
Subject: Re: [PATCH RFC] cpuset: Make cpusets get restored on hotplug
Message-ID: <20200326192035.GO162390@mtj.duckdns.org>
References: <20200326191623.129285-1-joel@joelfernandes.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200326191623.129285-1-joel@joelfernandes.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Mar 26, 2020 at 03:16:23PM -0400, Joel Fernandes (Google) wrote:
> This deliberately changes the behavior of the per-cpuset
> cpus file to not be effected by hotplug. When a cpu is offlined,
> it will be removed from the cpuset/cpus file. When a cpu is onlined,
> if the cpuset originally requested that that cpu was part of the cpuset,
> that cpu will be restored to the cpuset. The cpus files still
> have to be hierachical, but the ranges no longer have to be out of
> the currently online cpus, just the physically present cpus.

This is already the behavior on cgroup2 and I don't think we want to
introduce this big a behavior change to cgroup1 cpuset at this point.

Thanks.

-- 
tejun