linux-kernel - RE: [patch 0/2] x86, ptrace: support for branch trace store(BTS)

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Message-ID: <029E5BE7F699594398CA44E3DDF554440105236A@swsmsx413.ger.corp.intel.com>
Date:	Fri, 30 Nov 2007 15:45:31 -0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"Andi Kleen" <ak@...e.de>, <tglx@...utronix.de>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <mingo@...e.hu>, <hpa@...or.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Michael Kerrisk" <mtk-manpages@....net>,
	"Metzger, Markus T" <markus.t.metzger@...el.com>,
	<markus.t.metzger@...il.com>
Subject: RE: [patch 0/2] x86, ptrace:  support for branch trace store(BTS)

>> Not yet. We are talking to internal teams regarding gdb support.
>
>But you already have reasonably realistic test code right?

I wrote a small program to talk to ptrace and look at the trace of small
sample programs to test the patch. I do this on P4 32bit and Core2
64bit.

Our debugger team has a prototype implementation for their debugger. But
that will not be available for some time.

I hope that we get gdb support, soon, but that would take a while 
if I had to do it.

>e.g. I'm still feeling a bit uneasy about that global sysctl
>embedded in the interface.

I added a ptrace command to query for the maximal buffer size and moved
the macro to ptrace_bts.h.
I am not sure how much flexibility is actually needed, here. I would
expect
the trace to be very useful near its tail, but unmanageable when it gets
too big.
I would rather add flexibility when and where it is needed.

regards,
markus.
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