linux-kernel - Re: [PATCH 01/52] perf tools: Fix jump label always changing during tracing

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Message-ID: <53CF5124.2090901@intel.com>
Date:	Wed, 23 Jul 2014 09:07:32 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 01/52] perf tools: Fix jump label always changing during
 tracing

On 07/22/2014 05:11 PM, Peter Zijlstra wrote:
> On Tue, Jul 22, 2014 at 11:00:34AM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Tue, Jul 22, 2014 at 04:17:10PM +0300, Adrian Hunter escreveu:
>>> Intel PT decoding walks the object code to reconstruct
>>> the trace.  A jump label change during tracing causes
>>> decoding errors.
> 
> You'd better fix that, jump_labels can change any time and they're all
> over the frigging place.
> 

Perhaps a general method is needed to be able to deal with kernel
self-modifying code.

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