Re: [Patch v4 1/2] freezer: check OOM kill while being frozen

[Tejun Heo <tj@kernel.org>]

Hello,

On Thu, Sep 04, 2014 at 03:30:41PM -0700, Cong Wang wrote:
...
> Cc: David Rientjes <rientjes@google.com>
> Cc: Michal Hocko <mhocko@suse.cz>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Acked-by: Michal Hocko <mhocko@suse.cz>
> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Prolly should stable@vger.kernel.org?

> +static bool should_thaw_current(bool check_kthr_stop)
> +{
> +	if (!freezing(current))
> +		return true;
> +
> +	if (check_kthr_stop && kthread_should_stop())
> +		return true;
> +
> +	/* It might not be safe to check TIF_MEMDIE for pm freeze. */

This is just another representation of the following code which isn't
particularly useful.  Wouldn't it be better if the comment actually
explains why this might not be safe?

> +	if (cgroup_freezing(current) && test_thread_flag(TIF_MEMDIE))
> +		return true;
> +
> +	return false;
> +}

Other than that,

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun