linux-kernel - Re: [PATCHv2 6/9] perf: expose perf capability to other modules.

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Message-ID: <1320681671.17809.5.camel@twins>
Date:	Mon, 07 Nov 2011 17:01:11 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	kvm@...r.kernel.org, avi@...hat.com, mtosatti@...hat.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	acme@...stprotocols.net
Subject: Re: [PATCHv2 6/9] perf: expose perf capability to other modules.

On Mon, 2011-11-07 at 17:53 +0200, Gleb Natapov wrote:
> I removed branch-miss-retired here because for perf user it exists. Perf
> approximates it by other event but perf user shouldn't know that. A
> guest is not always runs with exactly same cpu model number as a host,
> so if we will not drop the bit here if guest will see cpu model other
> than the one that has this quirk it will not be able to use the event.

Right, so what model number do you expose? Anyway I don't really mind
masking the thing as long as we grow an ebx iteration,

> BTW why perf does not check event mask to see if architectural event is
> available before programming it? 

No idea why not.. just one of those things nobody noticed/got around to
doing or so.
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