lkml.org 
[lkml]   [2010]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [RFC] para virt interface of perf to support kvm guest os statistics collection in guest os

    * Peter Zijlstra <peterz@infradead.org> wrote:

    > On Wed, 2010-06-09 at 12:41 +0300, Avi Kivity wrote:
    > >
    > > >> Disabling the watchdog is unfortunate. Why is it necessary?
    > > >>
    > > > perf always uses NMI, so we disable the nmi_watchdog when a perf_event is
    > > > set up in case they might have impact.
    > > >
    > >
    > > Ok. Is that the case for the hardware pmus as well? If so it might be
    > > done in common code.
    >
    > The x86 hardware pmu implementation disables the lapic watchdog too, but
    > recent kernels come with a watchdog implementation on top of perf, the old
    > lapic one will be depricated.

    Note, that code is in -tip, queued for v2.6.36.

    Ingo


    \
     
     \ /
      Last update: 2010-06-09 12:31    [W:0.021 / U:32.296 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site