lkml.org 
[lkml]   [2006]   [Nov]   [17]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateFri, 17 Nov 2006 04:29:22 -0800
FromStephane Eranian <>
SubjectRe: [PATCH] i386 add Intel PEBS and BTS cpufeature bits and detection
On Fri, Nov 17, 2006 at 10:22:20AM +0100, Andi Kleen wrote:
> > The former
> > stores from/to information into MSRs and is very small (4 branches). 
> 
> P4 since Prescott has 16
> 
Yes. I was talking about Core 2 

> > On recent processors LBR and BTS can be constrained by priv level.
> 
> Doesn't help for kernel debugging.
> 
Well, if you set if for kernel level only, you do not capture user level
branches. This may happen if you crash soon after you've entered the kernel
and you have a small buffer.

-- 
-Stephane
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-11-17 12:33    [W:0.160 / U:0.210 seconds]
©2003-2008 Jasper Spaans