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| author | Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> | 2012-07-18 15:37:46 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-07-23 12:01:52 +0200 |
| commit | 4c088493c8d07e4e27bad53a99dcfdc14cdf45f8 (patch) | |
| tree | b90cfa07e207bb938b6997ae62c774c0624b0dd6 /virt/kvm | |
| parent | KVM: Add config to support ple or cpu relax optimzation (diff) | |
| download | linux-4c088493c8d07e4e27bad53a99dcfdc14cdf45f8.tar.xz linux-4c088493c8d07e4e27bad53a99dcfdc14cdf45f8.zip | |
KVM: Note down when cpu relax intercepted or pause loop exited
Noting pause loop exited vcpu or cpu relax intercepted helps in
filtering right candidate to yield. Wrong selection of vcpu;
i.e., a vcpu that just did a pl-exit or cpu relax intercepted may
contribute to performance degradation.
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> # on s390x
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/kvm_main.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 68dda513cd72..0892b75eeedd 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -239,6 +239,9 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) } vcpu->run = page_address(page); + kvm_vcpu_set_in_spin_loop(vcpu, false); + kvm_vcpu_set_dy_eligible(vcpu, false); + r = kvm_arch_vcpu_init(vcpu); if (r < 0) goto fail_free_run; @@ -1585,6 +1588,7 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) int pass; int i; + kvm_vcpu_set_in_spin_loop(me, true); /* * We boost the priority of a VCPU that is runnable but not * currently running, because it got preempted by something @@ -1610,6 +1614,7 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) } } } + kvm_vcpu_set_in_spin_loop(me, false); } EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); |