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

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.