linux-kernel - Re: [PATCH 1/2] perf_events: add cgroup support (v8)

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Message-ID: <AANLkTinvN9zcG5tzVjyZTfLKofxz-utWzYXvv9Um9sK5@mail.gmail.com>
Date:	Mon, 7 Feb 2011 13:33:34 -0800
From:	Paul Menage <menage@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	balbir@...ux.vnet.ibm.com, eranian@...gle.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com,
	robert.richter@....com, acme@...hat.com, lizf@...fujitsu.com
Subject: Re: [PATCH 1/2] perf_events: add cgroup support (v8)

On Mon, Feb 7, 2011 at 12:09 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> Also, the core cgroup code should deal with the cgroup refcount, not
> individual controllers.

Right, that's what I meant - make it so that an rmdir that fails
because a subsystem is still holding a refcount puts/leaves the cgroup
in a state where userspace will still get a notification when the last
refcount is dropped. Not something that the subsystem would have to
worry about.

Paul
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