Re: [RFC PATCH v2 09/17] cgroup: Keep accurate count of tasks in each css_set

[Tejun Heo]

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@xxxxxxxxxx>

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

Thanks.

-- 
tejun