linux-kernel - Re: disabling group leader perf

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Date:	Wed, 08 Sep 2010 09:19:03 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Paul Mackerras <paulus@...ba.org>
CC:	Ingo Molnar <mingo@...e.hu>, 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>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-perf-users@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: disabling group leader perf_event

  On 09/08/2010 04:44 AM, Paul Mackerras wrote:
>
> So... I would be interested to see you add the case for the MOV
> instruction. :)

x86 32-bit segmentation.

Unfortunately those are limited to i386.  With some care we could use 
them on x86_64 (temporarily switch the address space to include the 
"bytecode" and its data at the lower 4G, execute a far call to the 
bytecode, etc.

It's cumbersome though, and will make context switches to the bytecode 
quite slow.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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