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authorJing Zhang <jingzhangos@google.com>2021-08-02 16:56:33 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2021-08-20 16:06:33 -0400
commit8ccba534a1a5c6565220c81113d6157571f380cb (patch)
tree97477fd66bb78bfde851b94edda51f9513aac4c2 /virt
parent87bcc5fa092f82a9890f9e73e4f4c7016ef64049 (diff)
downloadlwn-8ccba534a1a5c6565220c81113d6157571f380cb.tar.gz
lwn-8ccba534a1a5c6565220c81113d6157571f380cb.zip
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e6fc579bb454..3e67c93ca403 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3222,13 +3222,23 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
++vcpu->stat.generic.halt_successful_poll;
if (!vcpu_valid_wakeup(vcpu))
++vcpu->stat.generic.halt_poll_invalid;
+
+ KVM_STATS_LOG_HIST_UPDATE(
+ vcpu->stat.generic.halt_poll_success_hist,
+ ktime_to_ns(ktime_get()) -
+ ktime_to_ns(start));
goto out;
}
cpu_relax();
poll_end = cur = ktime_get();
} while (kvm_vcpu_can_poll(cur, stop));
+
+ KVM_STATS_LOG_HIST_UPDATE(
+ vcpu->stat.generic.halt_poll_fail_hist,
+ ktime_to_ns(ktime_get()) - ktime_to_ns(start));
}
+
prepare_to_rcuwait(&vcpu->wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
@@ -3244,6 +3254,8 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
if (waited) {
vcpu->stat.generic.halt_wait_ns +=
ktime_to_ns(cur) - ktime_to_ns(poll_end);
+ KVM_STATS_LOG_HIST_UPDATE(vcpu->stat.generic.halt_wait_hist,
+ ktime_to_ns(cur) - ktime_to_ns(poll_end));
}
out:
kvm_arch_vcpu_unblocking(vcpu);