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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/