On Tue, 28 May 2019 at 17:12, Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote: > > On 28.05.19 02:53, Wanpeng Li wrote: > > From: Wanpeng Li <wanpengli@xxxxxxxxxxx> > > > > The target vCPUs are in runnable state after vcpu_kick and suitable > > as a yield target. This patch implements the sched yield hypercall. > > > > 17% performace increase of ebizzy benchmark can be observed in an > > over-subscribe environment. (w/ kvm-pv-tlb disabled, testing TLB flush > > call-function IPI-many since call-function is not easy to be trigged > > by userspace workload). > > > > Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> > > Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx> > > Signed-off-by: Wanpeng Li <wanpengli@xxxxxxxxxxx> > > FWIW, we do have a similar interface in s390. > > See arch/s390/kvm/diag.c __diag_time_slice_end_directed for our implementation. Good to know this. :) Regards, Wanpeng Li
