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

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Date:	Fri, 30 Nov 2007 15:48:21 -0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	<linux-kernel@...r.kernel.org>, <hpa@...or.com>,
	<tglx@...utronix.de>, <ak@...e.de>,
	"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)

>yep, i already tried to check how well it integrates to x86.git:

I ported it to scm/linux/kernel/git/x86/linux-2.6-x86.git mm.
I will send out the patch and then look at the below discussion.

>the code does not seem to be layered correctly: i'd suggest to 
>read the 
>discussion between Roland McGrath and Alan Stern on lkml, about kwatch 
>-> hw_breakpoint, to see how a more general debugging framework 
>can/should be built. These things shouldnt be limited to user-space 
>alone, the kernel could probably use hardware tracing even more than 
>user-space could. (because it's a much harder to debug environment)

regards,
markus.
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