linux-kernel - Re: disabling group leader perf

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Message-ID: <1283931048.1930.1827.camel@laptop>
Date:	Wed, 08 Sep 2010 09:30:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Paul Mackerras <paulus@...ba.org>, Avi Kivity <avi@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Tom Zanussi <tzanussi@...il.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: disabling group leader perf_event

On Wed, 2010-09-08 at 08:44 +0200, Ingo Molnar wrote:
> Thus instructions like 'mov (%rax), ...' would be handled by not 
> allowing them, only addresses which do not change from execution
> state.

> Do you know some interesting usecase that would be excluded via such 
> address restrictions? 

my_array[i] = foo;

usually ends up wanting to do something with a register offset.
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