[lkml]   [2017]   [Jul]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] turbostat: Running on virtual machine is not supported

On 07/26/2017 11:09 PM, Len Brown wrote:
> Henrique,
> I like your suggestion, thanks!
> BTW. let's discuss (and patch) turbostat on linux-pm, rather than on lkml.
> thanks,
> -Len
> On Tue, Jul 25, 2017 at 11:59 AM, Henrique de Moraes Holschuh
> <> wrote:
>> On Tue, 25 Jul 2017, Prarit Bhargava wrote:
>>> A common way of determining if the system is a virtual machine is to
>>> search /proc/cpuinfo flags entry for "hypervisor". turbostat must output
>>> a proper error message when found.
>> Maybe you could output that message only if it fails to both use
>> /dev/msr and perf *and* it is under a virtual machine? That would have
>> better forward compatibility, maybe someday /dev/msr or perf will work
>> inside a VM for what turbostat needs...

To answer Len's previous question: I was wrong in my description. perf does
work (mostly) under virt. So this would only be for the msr code. I'll post a
v2 to linux-pm, and take Henrique's suggestion to only trigger on an msr read


>> --
>> Henrique Holschuh

 \ /
  Last update: 2017-07-28 13:55    [W:0.082 / U:5.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site