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

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Message-ID: <20090926204848.0b2b48d2@infradead.org>
Date:	Sat, 26 Sep 2009 20:48:48 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	prasad@...ux.vnet.ibm.com
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, peterz@...radead.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC PATCH] perf_core: provide a kernel-internal interface to
 get to performance counters

On Sun, 27 Sep 2009 00:02:46 +0530
"K.Prasad" <prasad@...ux.vnet.ibm.com> wrote:

> On Sat, Sep 26, 2009 at 12:03:28PM -0400, Frank Ch. Eigler wrote:

> > For what it's worth, this sort of thing also looks useful from
> > systemtap's point of view.
> 
> Wouldn't SystemTap be another user that desires support for
> multiple/all CPU perf-counters (apart from hw-breakpoints as a
> potential user)? As Arjan pointed out, perf's present design would
> support only a per-CPU or per-task counter; not both.

I'm sorry but I think I am missing your point.
"all cpu counters" would be one small helper wrapper away, a helper I'm
sure the SystemTap people are happy to submit as part of their patch
series when they submit SystemTap to the kernel.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
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