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Message-ID: <029E5BE7F699594398CA44E3DDF55444019B50A0@swsmsx413.ger.corp.intel.com>
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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