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 09:16:53 -0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>
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>,
	<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: 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

>> Polish the ds.h interface and add support for PEBS.
>> 
>> Guard DS support and the ptrace interface to BTS by CONFIG macros;
>> disabled per default.
>> 
>> 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 - 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 not adding new features. It is merely re-establishing the state before the patch mysteriously disappeared from x86#testing.

You actually asked me to resubmit the patch.


regards,
markus.
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