Hello, On Wed, Aug 19, 2026 at 03:20:17PM -0700, Ziyang Men wrote: > Yes the css_rstat_flush() is exposed but currently it is marked as SLEEPABLE, > so > it doesn't accept a RCU_PROTECTED css we proposed. This is not a problem for > cpu > ones since &cgrp->self is a trusted pointer.
Yeah, bummer, so we get ref on cgroups but the subsys pointers are RCU, so that means those refs are only RCU protected. I guess we can't avoid a kfunc to get acquire a subsys css from cgroup. I wish css_rstat_flush() didn't schedule but it does need that cond_resched(). Thanks. -- tejun
