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| author | Jing Zhang <jingzhangos@google.com> | 2021-08-02 16:56:33 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-08-20 16:06:33 -0400 |
| commit | 8ccba534a1a5c6565220c81113d6157571f380cb (patch) | |
| tree | 97477fd66bb78bfde851b94edda51f9513aac4c2 /virt | |
| parent | 87bcc5fa092f82a9890f9e73e4f4c7016ef64049 (diff) | |
| download | lwn-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.c | 12 |
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); |