linux-kernel - Re: [RFCv2 0/8] perf tool: Add new event group management

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Message-ID: <1338280752.26856.2.camel@twins>
Date:	Tue, 29 May 2012 10:39:12 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, Andi Kleen <andi@...stfloor.org>,
	acme@...hat.com, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [RFCv2 0/8] perf tool: Add new event group management

On Sun, 2012-05-27 at 03:56 -0400, Ulrich Drepper wrote:
> Therefore it is important to recognize when two groups
> can be scheduled concurrently even if the total number of counters
> needed would be high but due to intersections it is possible. 

We currently don't do counter multiplexing like that. I'd love to see a
readable and efficient implementation of that though, preferably in the
core and not the arch code.
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