diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2015-09-15 18:27:57 +0200 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-09-16 12:17:00 +0200 |
commit | 62bea5bff486644ecf363fe8a1a2f6f32c614a49 (patch) | |
tree | 774180da187dabef4995896aec803248b075a36d /arch/s390/include | |
parent | 8f4216c7d28976f7ec1b2bcbfa0a9f787133c45e (diff) | |
download | op-kernel-dev-62bea5bff486644ecf363fe8a1a2f6f32c614a49.zip op-kernel-dev-62bea5bff486644ecf363fe8a1a2f6f32c614a49.tar.gz |
KVM: add halt_attempted_poll to VCPU stats
This new statistic can help diagnosing VCPUs that, for any reason,
trigger bad behavior of halt_poll_ns autotuning.
For example, say halt_poll_ns = 480000, and wakeups are spaced exactly
like 479us, 481us, 479us, 481us. Then KVM always fails polling and wastes
10+20+40+80+160+320+480 = 1110 microseconds out of every
479+481+479+481+479+481+479 = 3359 microseconds. The VCPU then
is consuming about 30% more CPU than it would use without
polling. This would show as an abnormally high number of
attempted polling compared to the successful polls.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com<
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/s390/include')
-rw-r--r-- | arch/s390/include/asm/kvm_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 3d012e0..6ce4a0b 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -210,6 +210,7 @@ struct kvm_vcpu_stat { u32 exit_validity; u32 exit_instruction; u32 halt_successful_poll; + u32 halt_attempted_poll; u32 halt_wakeup; u32 instruction_lctl; u32 instruction_lctlg; |