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Date:	Wed, 17 Nov 2010 13:51:52 +0100
From:	Peter Zijlstra <>
To:	Török Edwin <>
Cc:	Thomas Gleixner <>,
	LKML <>,
	Linus Torvalds <>,
	Andrew Morton <>,
	Ingo Molnar <>,
	Steven Rostedt <>,
	Arjan van de Ven <>
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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