linux-kernel - RE: debugctl msr

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Message-ID: <928CFBE8E7CB0040959E56B4EA41A77E08F3B93D@irsmsx504.ger.corp.intel.com>
Date:	Fri, 21 Nov 2008 16:10:59 +0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"eranian@...il.com" <eranian@...il.com>
CC:	Markus Metzger <markus.t.metzger@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: debugctl msr

>-----Original Message-----
>From: stephane eranian [mailto:eranian@...glemail.com] 
>Sent: Freitag, 21. November 2008 16:27
>To: Metzger, Markus T
>Cc: Markus Metzger; Ingo Molnar; Andi Kleen; Andrew Morton; 
>linux-kernel@...r.kernel.org
>Subject: Re: debugctl msr

>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.

The default is cyclic mode, which requires the interrupt threshold
to be outside of the buffer.

A request for interrupt mode should have got you -EOPNOTSUPP.

Absolute max should be one byte beyond the buffer, which
is base + size.


regards,
markus.
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