linux-kernel - Re: [PATCH 7/9] ftrace, perf: Add support to use function tracepoint in perf

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Message-ID: <1322511002.2921.171.camel@twins>
Date:	Mon, 28 Nov 2011 21:10:02 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, fweisbec@...il.com, mingo@...hat.com,
	paulus@...ba.org, acme@...stprotocols.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] ftrace, perf: Add support to use function
 tracepoint in perf

On Mon, 2011-11-28 at 21:08 +0100, Peter Zijlstra wrote:
> > Is it really an issue that we shouldn't call the full blown register
> > instead? I'm not really understanding why this is a problem. Note, one
> > of the improvements to ftrace in the near future is to enable ftrace
> > without stop_machine. 
> 
> Yeah, but still not something you want to do during context switches,
> right? 

Also, that's x86, there's still archs that need stop_machine(), right?
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