Re: [PATCH 0/3] cgroup id and scanning without cgroup_lock

From: Balbir Singh
Date: Mon Dec 01 2008 - 01:32:31 EST

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> [2008-12-01 14:59:07]:

> This is a series of patches againse mmotm-Nov29
> (passed easy test)
> Now, memcg supports hierarhcy. But walking cgroup tree in intellegent way
> with lock/unlock cgroup_mutex seems to have troubles rather than expected.
> And, I want to reduce the memory usage of swap_cgroup, which uses array of
> pointers.
> This patch series provides
> - cgroup_id per cgroup object.
> - lookup struct cgroup by cgroup_id
> - scan all cgroup under tree by cgroup_id. without mutex.
> - css_tryget() function.
> - fixes semantics of notify_on_release. (I think this is valid fix.)
> Many changes since v1. (But I wonder some more work may be neeeded.)
> BTW, I know there are some amount of patches against memcg are posted recently.
> If necessary, I'll prepare Weekly-update queue again (Wednesday) and
> picks all patches to linux-mm in my queue.

Thanks for the offer, I've just come back from I need to look
athe locking issue with cgroup_lock() reported and also review/test
the other patches.

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