On Wed, 2009-09-16 at 20:58 +0530, Dipankar Sarma wrote: > 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.
I'm missing something here, hot-unplug is a slow path and should not ever be latency critical..? _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
