lkml.org 
[lkml]   [2010]   [Apr]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH V3] perf & kvm: Enhance perf to collect KVM guest os statistics from host side
    On 04/15/2010 12:44 PM, oerg Roedel wrote:
    >
    >> So, we'd need something like the following:
    >>
    >> if (exit == NMI)
    >> __get_cpu_var(nmi_vcpu) = vcpu;
    >>
    >> stgi();
    >>
    >> if (exit == NMI) {
    >> while (!nmi_handled())
    >> cpu_relax();
    >> __get_cpu_var(nmi_vcpu) = NULL;
    >> }
    >>
    > Hmm, looks a bit complicated to me. The NMI should happen shortly after
    > the stgi instruction. Interrupts are still disabled so we stay on this
    > cpu. Can't we just set and erase the cpu_var at vcpu_load/vcpu_put time?
    >
    >

    That means an NMI that happens outside guest code (for example, in the
    mmu, or during the exit itself) would be counted as if in guest code.

    --
    I have a truly marvellous patch that fixes the bug which this
    signature is too narrow to contain.



    \
     
     \ /
      Last update: 2010-04-15 11:51    [W:2.399 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site