linux-kernel - Re: [RFC PATCH 2/9] perf: Add ability to dump user regs

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Date:	Wed, 20 Oct 2010 18:19:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Robert Richter <robert.richter@....com>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH 2/9] perf: Add ability to dump user regs

On Wed, 2010-10-20 at 11:24 +0200, Stephane Eranian wrote:
> 
> The alternative would be to invent yet another generic abstraction
> to sample cache misses. Note that PEBS cache miss sampling
> cannot be attached to an existing generic cache miss event. It
> uses a dedicated event which does not count all cache misses. 

Yeah, the IBS trainwreck comes to mind, I wish the PMU designers
wouldn't create such a mess.

I really dislike using PERF_SAMPLE_RAW for things like this, because it
fully arch dependent.
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