linux-kernel - Re: [rfc 3/3] perf, x86: P4 PMU -- export ABI part of event config to userspace

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Date:	Wed, 24 Nov 2010 09:32:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	ming.m.lin@...el.com, eranian@...gle.com
Subject: Re: [rfc 3/3] perf, x86: P4 PMU -- export ABI part of event config
 to userspace

On Wed, 2010-11-24 at 01:46 +0300, Cyrill Gorcunov wrote:
> plain text document attachment (x86-perf-export-abi)
> Due to tight 64 bit size of event config field (where we have to track
> pretty lot of info during event lifetime) some bits are to be exported
> via header into userspace.
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> CC: Lin Ming <ming.m.lin@...el.com>
> CC: Stephane Eranian <eranian@...gle.com>
> CC: Peter Zijlstra <peterz@...radead.org>
> ---
> 
> Note that I don't like much the idea to export anything into userspace
> but it seems there is no other choise. So there is a minimum which should
> be exported.


Could you say what exactly is exposed to userspace and why?
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