lkml.org 
[lkml]   [2010]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 0/2] perf: Use LBR for machine/oops debugging
From
On Mon, Mar 29, 2010 at 2:08 PM, Andi Kleen <andi@firstfloor.org> wrote:
> Peter Zijlstra <a.p.zijlstra@chello.nl> writes:
>
>> The LBRs are relatively cheap to keep enabled and provide some history
>> to OOPSen, also some CPUs are reported to keep them over soft-reset,
>> which allows us to use them to debug things like tripple faults.
>>
>> Therefore introduce a boot option: lbr_debug=on, which always enable
>> the LBRs and will print the LBRs on CPU init and die().
>
>
> die is too late. they will only contain the oops code then.
>
Most likely yes, especially with small LBR, such as on Intel Core.


> -Andi
>
> --
> ak@linux.intel.com -- Speaking for myself only.
>


\
 
 \ /
  Last update: 2010-03-29 15:19    [W:0.111 / U:0.824 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site