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From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
To: eranian@gmail.com
Cc: linux-kernel@vger.kernel.org, anil.s.keshavamurthy@intel.com,
	davem@davemloft.net, "Metzger,
	Markus T" <markus.t.metzger@intel.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Subject: Re: [PATCH] x86 debugctl MSR access interface
Date: Mon, 10 Nov 2008 11:28:35 +0530	[thread overview]
Message-ID: <20081110055835.GD3139@in.ibm.com> (raw)
In-Reply-To: <7c86c4470811070644h1f65ccdfi32c78fbf173abed9@mail.gmail.com>

On Fri, Nov 07, 2008 at 03:44:09PM +0100, stephane eranian wrote:
> Hello,
> 
> On Intel X86 processors, the DEBUGCTL msr contains lots of bits
> to control various unrelated features, such as LBR, BTS, PMU.
> 
> Nowadays, several subsystems need access to this MSR to set or
> clear the bits they care about. In 2.6.27, the new DS/BTS interface
> was introduced and DEBUGCTL can now be cleared and restored
> on context switches.
> 
> The KPROBE interface also uses DEBUGCTL.

Stephane,

I see no problems with the kprobes part of the patch.

Ananth

      reply	other threads:[~2008-11-10  5:59 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-07 14:44 [PATCH] x86 debugctl MSR access interface stephane eranian
2008-11-10  5:58 ` Ananth N Mavinakayanahalli [this message]

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