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

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Date:	Mon, 07 Feb 2011 21:09:22 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Menage <menage@...gle.com>
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, 2011-02-07 at 11:29 -0800, Paul Menage wrote:
> > This again means that all such notification handlers must poll state,
> > which is ridiculous.
> >
> 
> Not necessarily - we could make it that a failed rmdir() sets a bit
> that causes a notification again once the final refcount is dropped
> again on the cgroup. 

But that doesn't work if you fail for any other reason than a refcount,
which you yourself proposed a while back.

Also, the core cgroup code should deal with the cgroup refcount, not
individual controllers.

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