Paolo Bonzini 62bea5bff4 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>		2015-09-16 12:17:00 +02:00
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asm	KVM: add halt_attempted_poll to VCPU stats	2015-09-16 12:17:00 +02:00
uapi/asm	ARM:	2015-09-10 16:42:49 -07:00