linux-kernel - Re: [RFC 0/5] kernel: backtrace unwind support

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Date:	Fri, 10 Feb 2012 17:42:27 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Jan Blunck <jblunck@...e.de>
Subject: Re: [RFC 0/5] kernel: backtrace unwind support

Em Fri, Feb 10, 2012 at 05:39:32PM -0200, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Feb 10, 2012 at 11:32:42AM -0800, Linus Torvalds escreveu:
> > On Fri, Feb 10, 2012 at 11:27 AM, Arnaldo Carvalho de Melo
> > > "Vote for --fno-omit-frame-pointer! One register is a cheap price to pay
> > > for not going insane!"

> > > /me goes back to non political things.

> > Even with -fomit-frame-pointer (which seems to be a big deal on Atom
> > in particular)
> 
> Nah, on such register starved arches we just do what we do today: try to
> figure out bogus addresses and bail out.

And the "interesting" thing is that at least on:

[acme@...nha linux]$ cat /etc/fedora-release 
Fedora release 14 (Laughlin)
[acme@...nha linux]$ uname -p
i686

I have -fno-omit-frame-pointer and get nice callchains, but if I try it
on fedora x86_64... b00m. Go figure.

- Arnaldo
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