linux-kernel - Re: [RFC PATCH] perf_core: provide a kernel-internal interface to get to performance counters

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Message-ID: <20090926162040.GA17819@redhat.com>
Date:	Sat, 26 Sep 2009 12:20:40 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, peterz@...radead.org,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC PATCH] perf_core: provide a kernel-internal interface to get to performance counters

Hi -

On Sat, Sep 26, 2009 at 06:11:49PM +0200, Arjan van de Ven wrote:
> [...]
> your appearance is not correct. A perf counter is either attached to a
> task, or to a cpu. I use the later.

OK, that explains the "MUST be called from kernel thread" comment --
so that the ->owner and get/put_task_struct in the new create/free
functions all refer to that kernel thread.  Thanks.

- FChE
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