linux-kernel - Re: [patch 0/2] x86, ptrace: support for branch trace store(BTS)

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Message-Id: <200712031721.39013.ak@suse.de>
Date:	Mon, 3 Dec 2007 17:21:38 +0100
From:	Andi Kleen <ak@...e.de>
To:	"Markus Metzger" <markus.t.metzger@...glemail.com>
Cc:	"Roland McGrath" <roland@...hat.com>,
	"Metzger, Markus T" <markus.t.metzger@...el.com>,
	tglx@...utronix.de, "Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Michael Kerrisk" <mtk-manpages@....net>,
	markus.t.metzger@...il.com, "Ingo Molnar" <mingo@...e.hu>
Subject: Re: [patch 0/2] x86, ptrace: support for branch trace store(BTS)

On Monday 03 December 2007 14:53:27 Markus Metzger wrote:
> > Cool.  It's been on my list to look into exposing those features
> > somehow. I hadn't planned on doing it until after the utrace stuff
> > settles and there is a more coherent interface context in which to do
> > it.
> 
> I'm looking very much forward to utrace. From what I read so far, this is
> a much nicer interface.

Just don't wait for that. utrace doesn't seem to have any concrete 
plans to merge any time soon AFAIK[1] and it would be a shame to delay an useful
feature forever.

[1] At least the patches have not reached any mailing lists

> What did you have in mind when you asked for kernel-mode support?

I asked about that earlier too and I would like to see per CPU traces
for ring 0 with some way to dump that on crashes or on user trigger.

-Andi

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