KVM: stats: Add halt polling related histogram stats
Add three log histogram stats to record the distribution of time spent
on successful polling, failed polling and VCPU wait.
halt_poll_success_hist: Distribution of spent time for a successful poll.
halt_poll_fail_hist: Distribution of spent time for a failed poll.
halt_wait_hist: Distribution of time a VCPU has spent on waiting.
Signed-off-by: Jing Zhang <jingzhangos@google.com>
Message-Id: <20210802165633.1866976-6-jingzhangos@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 813ca155..6d63c8e 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4146,17 +4146,29 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
if (do_sleep) {
vc->runner->stat.generic.halt_wait_ns +=
ktime_to_ns(cur) - ktime_to_ns(start_wait);
+ KVM_STATS_LOG_HIST_UPDATE(
+ vc->runner->stat.generic.halt_wait_hist,
+ ktime_to_ns(cur) - ktime_to_ns(start_wait));
/* Attribute failed poll time */
- if (vc->halt_poll_ns)
+ if (vc->halt_poll_ns) {
vc->runner->stat.generic.halt_poll_fail_ns +=
ktime_to_ns(start_wait) -
ktime_to_ns(start_poll);
+ KVM_STATS_LOG_HIST_UPDATE(
+ vc->runner->stat.generic.halt_poll_fail_hist,
+ ktime_to_ns(start_wait) -
+ ktime_to_ns(start_poll));
+ }
} else {
/* Attribute successful poll time */
- if (vc->halt_poll_ns)
+ if (vc->halt_poll_ns) {
vc->runner->stat.generic.halt_poll_success_ns +=
ktime_to_ns(cur) -
ktime_to_ns(start_poll);
+ KVM_STATS_LOG_HIST_UPDATE(
+ vc->runner->stat.generic.halt_poll_success_hist,
+ ktime_to_ns(cur) - ktime_to_ns(start_poll));
+ }
}
/* Adjust poll time */
