linux-kernel - Re: [Patch v3 1/2] freezer: check OOM kill while being frozen

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Message-ID: <CAM_iQpUCN8d_d9U+wE05zxM_LWiDwqV_9pNXgquZQybQJdY+XA@mail.gmail.com>
Date:	Wed, 3 Sep 2014 21:47:37 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	LKML <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 v3 1/2] freezer: check OOM kill while being frozen

On Wed, Sep 3, 2014 at 8:42 AM, Tejun Heo <tj@...nel.org> wrote:
> Hello, Cong.
>
> On Tue, Sep 02, 2014 at 03:52:40PM -0700, Cong Wang wrote:
>> diff --git a/kernel/freezer.c b/kernel/freezer.c
>> index 33cbcb0..b06a059 100644
>> --- a/kernel/freezer.c
>> +++ b/kernel/freezer.c
>> @@ -56,7 +56,8 @@ static bool should_thaw_current(bool check_kthr_stop)
>>  {
>>         if (!freezing(current) ||
>>             (check_kthr_stop && kthread_should_stop()) ||
>> -           test_thread_flag(TIF_MEMDIE))
>> +           /* It might not be safe to check TIF_MEMDIE for pm freeze */
>> +           (cgroup_freezing(current) && test_thread_flag(TIF_MEMDIE)))
>>                 return true;
>>         else
>>                 return false;
>>
>> Are you happy now, Tejun? :)
>
> Yes, this should be a lot safer.  The function still looks weird to me
> tho.

Cool.

>
>         if (cond)
>                 return true;
>         else
>                 return false;
>
> is equivalent to
>
>         return cond;
>
> If you're worried that the conditional is too complex and harms
> readability you can do
>
>         /* explain cond0 */
>         if (cond0)
>                 return true;
>
>         /* explain cond1 */
>         if (cond1)
>                 return true;
>
>         return false;
>

Sure, definitely much more readable. I will update this patch.

Thanks!
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