lkml.org 
[lkml]   [2009]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v3 0/3] cpu: pseries: Cpu offline states framework
    On Tue, Sep 15, 2009 at 02:11:41PM +0200, Peter Zijlstra wrote:
    > On Tue, 2009-09-15 at 17:36 +0530, Gautham R Shenoy wrote:
    > > This patchset contains the offline state driver implemented for
    > > pSeries. For pSeries, we define three available_hotplug_states. They are:
    > >
    > > online: The processor is online.
    > >
    > > offline: This is the the default behaviour when the cpu is offlined
    > >
    > > inactive: This cedes the vCPU to the hypervisor with a cede latency
    > >
    > > Any feedback on the patchset will be immensely valuable.
    >
    > I still think its a layering violation... its the hypervisor manager
    > that should be bothered in what state an off-lined cpu is in.

    The problem is that all hypervisor managers cannot figure out what sort
    of latency guest OS can tolerate under the situation. They wouldn't know
    from what context guest OS has ceded the vcpu. It has to have
    some sort of hint, which is what the guest OS provides.

    Thanks
    Dipankar


    \
     
     \ /
      Last update: 2009-09-16 17:31    [W:2.701 / U:0.008 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site