On 8/25/18 1:22 AM, Dario Faggioli wrote: > When a vcpu that was offline, comes back online, we do want it to either > be assigned to a pCPU, or go into the wait list. > > So let's do exactly that. Detecting that a vcpu is coming back online is > a bit tricky. Basically, if the vcpu is waking up, and is neither > assigned to a pCPU, nor in the wait list, it must be coming back from > offline. > > When this happens, we put it in the waitqueue, and we "tickle" an idle > pCPU (if any), to go pick it up. > > Looking at the patch, it seems that the vcpu wakeup code is getting > complex, and hence that it could potentially introduce latencies. > However, all this new logic is triggered only by the case of a vcpu > coming online, so, basically, the overhead during normal operations is > just an additional 'if()'. > > Signed-off-by: Dario Faggioli <dario.faggi...@suse.com>
Reviewed-by: George Dunlap <george.dun...@citrix.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
