linux-kernel - Re: [PATCH 1/2] perf-events: Add support for supplementary event registers v2

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Message-ID: <20101115113148.GG7269@basil.fritz.box>
Date:	Mon, 15 Nov 2010 12:31:48 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu, fweisbec@...il.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/2] perf-events: Add support for supplementary event
 registers v2

> Why would you want to measure both at the same time?
> Because you can measure two distinct request/response in one run.
> 
> If you want to measure both you need to create two distinct perf events.

What I did currently was to assign some cache events to 0xb7 and
others to bb on Westmere. That's a bit arbitrary, but allows to 
measure some common combinations together at least.

In theory one could teach the scheduler that these events
are equivalent, but that seems like too much complexity for 
me currently.
-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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