Re: [PATCH 1/2] io_uring: wait potential ->release() on resurrect

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On 20/02/2021 03:40, Jens Axboe wrote:
> On 2/19/21 6:39 PM, Pavel Begunkov wrote:
>> There is a short window where percpu_refs are already turned zero, but
>> we try to do resurrect(). Play nicer and wait for all users to leave RCU
>> section.
> 
> We need to do something better than synchronize_rcu() here, that can
> take a long time on a loaded box. I'll try and think about this one.

It only happens when it can't be drained and there are task_works or
signals. I have another patch, doing it via tryget, but it's uglier and
I'd rather prefer synchronize_rcu for stable.

Want me to send it tomorrow (on top or not)?

-- 
Pavel Begunkov



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