linux-kernel - Re: [RFC PATCH v2 09/17] cgroup: Keep accurate count of tasks in each css

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Date:   Wed, 17 May 2017 17:40:34 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...com, pjt@...gle.com,
        luto@...capital.net, efault@....de
Subject: Re: [RFC PATCH v2 09/17] cgroup: Keep accurate count of tasks in
 each css_set

Hello,

On Mon, May 15, 2017 at 09:34:08AM -0400, Waiman Long wrote:
> The reference count in the css_set data structure was used as a
> proxy of the number of tasks attached to that css_set. However, that
> count is actually not an accurate measure especially with thread mode
> support. So a new variable task_count is added to the css_set to keep
> track of the actual task count. This new variable is protected by
> the css_set_lock. Functions that require the actual task count are
> updated to use the new variable.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>

Looks good.  We probably should replace css_set_populated() to use
this too.

Thanks.

-- 
tejun