linux-kernel - Re: [ANNOUNCE] New utility: 'trace'

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Message-ID: <1289998312.2109.745.camel@laptop>
Date:	Wed, 17 Nov 2010 13:51:52 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Török Edwin <edwintorok@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [ANNOUNCE] New utility: 'trace'

On Wed, 2010-11-17 at 14:47 +0200, Török Edwin wrote:
> I see --call-graph in the trace record -h output, but it doesn't seem
> to work on x86_64 for me.

If you want to unwind userspace you need to build everything with
framepointers -- sadly some people have been lobbying to remove
framepointers from all distro builds, even though on x86_64 its nearly
free (i386 does have a significant performance benefit, sadly).

There's some work on-going to simply copy out the top of stack and let
dwarves go wild at it in userspace, but that isn't done yet.

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