linux-kernel - Re: [PATCH 3/4] trace: add ability to collect call chain of non-current task.

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Date:	Tue, 27 Sep 2011 16:05:51 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Vagin <avagin@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 3/4] trace: add ability to collect call chain of
 non-current task.

On Mon, 2011-09-26 at 19:55 +0400, Andrew Vagin wrote:
> 
> Know issues:
> * Now call chains for non-current tasks are collected on x86 only,
>   but it may be done for other architectures simply.
> * It collects only kernel call chains, because we can't get direct
>   access to memory of other processes and this operation should be
>   fast enough. 

Also, it changes the semantics of tracepoint, normally you return the
callchain leading to the tracepoint, this changes that.


I'm not entirely against it, as I can see the use, but I would like to
solicit other opinions.
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