[PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs

Tejun Heo tj at kernel.org
Wed Oct 31 20:11:02 UTC 2012


On Wed, Oct 31, 2012 at 1:08 PM, Michal Hocko <mhocko at suse.cz> wrote:
> local_irq_disable doesn't guarantee atomicity, because other CPUs will

Maybe it should say atomicity on the local CPU.

> see the change in steps so this is a bit misleading. The real reason
> AFAICS is that we do not want to hang in css_tryget from IRQ context
> (does this really happen btw.?) which would interrupt cgroup_rmdir
> between we add CSS_DEACT_BIAS and the group is marked CGRP_REMOVED.
> Or am I still missing the point?

Yeah, that's the correct one. We don't want tryget happening between
DEACT_BIAS and REMOVED as it can hang forever there.



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