Re: [PATCH] cgroup: wait for css offline when rmdir

[Tejun Heo]

On Tue, May 31, 2022 at 07:19:31AM -1000, Tejun Heo wrote:
> Maybe just keep the sequence numbers for started and completed offline
> operations and wait for completed# to reach the started# on memcg alloc
> failure and retry? Note that we can get live locked, so have to remember the
> sequence number to wait for at the beginning. Or, even simpler, maybe it'd
> be enough to just do synchronize_rcu() and then wait for the offline wait
> once and retry.

Also, given that it's an memcg ID issue. It probably makes sense to
implement it on the memcg side.

Thanks.

-- 
tejun