linux-kernel - Re: [PATCH 13/22] 2.6.22-rc3 perfmon2 : common core functions

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Message-ID: <20070531190237.GB7217@one.firstfloor.org>
Date:	Thu, 31 May 2007 21:02:37 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@....hp.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/22] 2.6.22-rc3 perfmon2 : common core functions

> People will want perfom and oprofile in the same kernel, and we'd better

Yes.

> allow useage at the same time, so I'd be very much in favour of having

That would be nice, but is not imho critical.

> just one backend.  Especially giving the huge amount of different
> performance counters we have to support.

It's not that big an issue in my experience -- there aren't new x86 CPUs 
that often and normally they don't change much between minor revisions.
Also at least Intel now has an architected subset of perfctrs
which I expect to cover most people's needs.

-Andi
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