linux-kernel - RE: [patch 1/2] x86, ptrace: support pebs in ds.c

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Date:	Fri, 22 Feb 2008 10:12:48 -0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Roland McGrath" <roland@...hat.com>, <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>
Subject: RE: [patch 1/2] x86, ptrace: support pebs in ds.c

>-----Original Message-----
>From: Ingo Molnar [mailto:mingo@...e.hu] 
>Sent: Freitag, 22. Februar 2008 10:53
>To: Metzger, Markus T

>> The ptrace API is the user interface for the debugging/BTS aspect of 
>> it. As such, it will remain stable.
>
>your last patch does this to arch/x86/kernel/ptrace.c:
>
>  266 insertions(+), 174 deletions(-)
>
>doesnt that change the ptrace bits and the ptrace API semantics?

The last patch does change the ptrace API - before it becomes public.

After it becomes public, ds.c can be changed without affecting the
ptrace API.


The last changes are not strictly necessary - I could as well implement
the old interface. If there are objections to or concerns regarding
those API changes, I will do just that. The changes are:
- add PTRACE_BTS_O_ALLOC to explicitly request reallocation of the BTS
buffer.
  This used to be implicit when the size changes.
- remove PTRACE_BTS_O_CUT_SIZE
  This used to reduce the size requested for the BTS buffer to the
maximal available size, if necessary.
  I do not think this is necessary. Users should check their ulimits.

This is what I meant with ironing out the ptrace API.


thanks and regards,
markus.
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