linux-kernel - Re: [PATCH 00/21] perf, c2c: Add new tool to analyze cacheline contention on NUMA systems

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Message-ID: <20140211120921.GX9987@twins.programming.kicks-ass.net>
Date:	Tue, 11 Feb 2014 13:09:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Don Zickus <dzickus@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, Joe Mario <jmario@...hat.com>,
	Richard Fowles <fowles@...each.com>
Subject: Re: [PATCH 00/21] perf, c2c: Add new tool to analyze cacheline
 contention on NUMA systems

On Tue, Feb 11, 2014 at 08:50:13AM -0300, Arnaldo Carvalho de Melo wrote:
> 3) PERF_SAMPLE_REGS_USER (from a quick look, why do we have "USER" in
> it? Jiri?)

Note that the regs are in the POST instruction state, so any op that
does something like:

  MOV %edx, $(eax+edx*8)

Will have lost the original index value.
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