Re: [Patch] freezer: check OOM kill signal while being frozen
From: Cong Wang
Date: Mon Aug 11 2014 - 20:27:27 EST
On Sat, Aug 9, 2014 at 1:55 AM, David Rientjes <rientjes@xxxxxxxxxx> wrote:
> On Fri, 8 Aug 2014, Cong Wang wrote:
>> diff --git a/kernel/freezer.c b/kernel/freezer.c
>> index aa6a8aa..c6d189d 100644
>> --- a/kernel/freezer.c
>> +++ b/kernel/freezer.c
>> @@ -68,7 +68,9 @@ bool __refrigerator(bool check_kthr_stop)
>> current->flags |= PF_FROZEN;
>> if (!freezing(current) ||
>> - (check_kthr_stop && kthread_should_stop()))
>> + (check_kthr_stop && kthread_should_stop()) ||
>> + (test_tsk_thread_flag(current, TIF_MEMDIE) &&
>> + fatal_signal_pending(current)))
>> current->flags &= ~PF_FROZEN;
> All threads with TIF_MEMDIE set would have been killed, why is the check
> for fatal_signal_pending(current) needed?
So just checking TIF_MEMDIE is enough, right?
> You can also use test_thread_flag(TIF_MEMDIE) instead since you're only
> concerned with current.
OK, will do.
> Furthermore, that conditional is getting difficult to read. Maybe it
> would help to have a helper function that returns bool that determines
> whether PF_FROZEN should be cleared?
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