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Message-ID: <7c86c4470811210727o13006d5bk5bcbacb791e51b1c@mail.gmail.com>
Date: Fri, 21 Nov 2008 16:27:25 +0100
From: "stephane eranian" <eranian@googlemail.com>
Reply-To: eranian@gmail.com
To: "Metzger, Markus T" <markus.t.metzger@intel.com>
Subject: Re: debugctl msr
Cc: "Markus Metzger" <markus.t.metzger@googlemail.com>,
       "Ingo Molnar" <mingo@elte.hu>, "Andi Kleen" <andi@firstfloor.org>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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Markus,

Ok, I finally got everything working. The interrupt issue was due to a
bug in the perfmon code.

But I found another bug in ds.c.

The absolute maximum MUST be at buffer+size+1 but the threshold can be anywhere
between the start of the buffer and buffer+size. You had it set past
the end of the buffer (at +1),
therefore PEBS was not generating any interrupts.

On Fri, Nov 21, 2008 at 2:38 PM, stephane eranian
<eranian@googlemail.com> wrote:
> Markus,
>
> On Fri, Nov 21, 2008 at 9:22 AM, Metzger, Markus T
> <markus.t.metzger@intel.com> wrote:
>> I also added the interrupt threshold to the parameters of ds_request().
>> It will be fix for one tracing session, if that's OK with you.
>>
> I still need a call to query the threshold.
>
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