linux-kernel - Re: [patch] x86, ptrace: in-kernel BTS interface

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Message-ID: <20080430160611.GD20451@one.firstfloor.org>
Date:	Wed, 30 Apr 2008 18:06:11 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Metzger, Markus T" <markus.t.metzger@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>, andi-suse@...stfloor.org,
	hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de, markus.t.metzger@...il.com,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>, roland@...hat.com,
	akpm@...ux-foundation.org, mtk.manpages@...il.com,
	eranian@...glemail.com, "Villacis, Juan" <juan.villacis@...el.com>
Subject: Re: [patch] x86, ptrace: in-kernel BTS interface

> 
> >I'm not quite sure on the kernel interface. How would a in kernel
> >subsystem use it for tracing itself for example?
> 
> The task parameter would be current.
> 
> Apart from that, you would use it the same way it is used in
> arch/x86/kernel/ptrace.c.

Hmm, sounds a little too complicated. Surely that could be easier?

> 
> You would want to bts_configure() it to disable tracing before you start
> reading your own BTS buffer.

I would suggest to write a simple example and put it with some overview
into Documentation

-Andi


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