lkml.org 
[lkml]   [2008]   [Dec]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Perfctr-devel] [patch] Performance Counters for Linux, v4
William Cohen wrote:
> Ingo Molnar wrote:
>> We are pleased to announce the v4 release of our performance counters
>> subsystem implementation. The kernel changes can be picked up from:
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git
>> perfcounters/core
>>
>> (also in the master branch. There's also a kernel patch attached
>> below.)
>
> Machines that support virtualization are becoming very common. How is
> this performance monitoring support going to work with virtualization
> (e.g. KVM)? Having the performance counters only work on physical
> machines would be pretty limiting.

On Power machines, the PMU counter registers are virtualized by the
hypervisor, at the request of the OS, on a per-cpu/per-partition basis.
So this issue is handled transparently on Power anyway.

- Corey

Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR
503-578-3507
cjashfor@us.ibm.com



\
 
 \ /
  Last update: 2008-12-17 21:57    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site