Re: [RFC][PATCH 1/6] memcg: fix pre_destory handler

[Paul Menage]

On Wed, Dec 10, 2008 at 5:47 AM, Daisuke Nishimura
<d-nishimura@xxxxxxxxxxxxxxxxx> wrote:
> Hmm.. but doesn't per-hierarchy-mutex solve the problem if memory and cpuset
> mounted on the same hierarchy ?
>

It's not a per-hierarchy mutex - it's a per-subsystem lock against
changes on that subsystem's hierarchy. So each subsystem just has to
take its own lock, rather than a global or per-hierarchy lock. The
cgroups code takes care of acquiring the multiple locks in a safe
order when necessary.

Paul
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