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
