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

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Message-ID: <20140905140815.GA10455@mtj.dyndns.org>
Date:	Fri, 5 Sep 2014 23:08:15 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch v4 1/2] freezer: check OOM kill while being frozen

Hello,

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

Prolly should stable@...r.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@...nel.org>

Thanks.

-- 
tejun
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