linux-kernel - RE: [patch] x86, ptrace: support pebs in ds.c and disable ptraceand ds support

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Date:	Wed, 26 Mar 2008 09:39:46 -0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>, <roland@...hat.com>
Cc:	<ak@...e.de>, <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
	<tglx@...utronix.de>, <markus.t.metzger@...il.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	<akpm@...ux-foundation.org>, <mtk.manpages@...il.com>,
	<eranian@...glemail.com>,
	"Villacis, Juan" <juan.villacis@...el.com>
Subject: RE: [patch] x86, ptrace: support pebs in ds.c and disable ptraceand ds support

>-----Original Message-----
>From: Ingo Molnar [mailto:mingo@...e.hu] 
>Sent: Freitag, 21. März 2008 13:54

>> Ds.c is meant to be the resource allocator for per-thread and per-cpu
>> BTS and PEBS recording.
>> It is used by ptrace to provide execution tracing of debugged tasks.
>> It will be used by utrace for the same purpose.
>> It will be used by profilers (e.g. perfmon2).
>> It may be used by kernel debuggers to provide a kernel 
>execution trace.
>
>we could apply this if Roland Acks it - 

I moved Roland to the To: list. I hope we can resolve this in a technical discussion.

>but i guess a precondition for 
>that is to not include more ptrace extensions and to also 
>start working 
>on utrace support for it. Ptrace is something we want to reduce usage 
>of, not extend.

The patch is targeting application debuggers (in the first place). As far as I know, today's application debuggers are using ptrace. And I expect them to continue to use ptrace for some time.

I would not want to exclude existing debuggers from this feature; nor would I want to put a too big burden on debuggers if they wished to support execution tracing.

I will look into utrace as an additional interface.

Until utrace has been adopted by debuggers, I think ptrace (as its predecessor) is a good choice for an interim solution. 

regards,
markus.
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