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KVM: Update halt-polling stats if and only if halt-polling was attempted 

Don't update halt-polling stats if halt-polling wasn't attempted.  This is
a nop as @poll_ns is guaranteed to be '0' (poll_end == start); in a future
patch (to move the histogram stats into the helper), it will avoid to
avoid a discrepancy in what is considered a "successful" halt-poll.

No functional change intended.

Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211009021236.4122790-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-10-08 19:11:58 -07:00 committed by Paolo Bonzini
parent 510958e997
commit 8df6a61c04
1 changed files with 5 additions and 3 deletions
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8
virt/kvm/kvm_main.c
View File

@ -3288,6 +3288,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
{
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
bool halt_poll_allowed = !kvm_arch_no_poll(vcpu);
bool do_halt_poll = halt_poll_allowed && vcpu->halt_poll_ns;
ktime_t start, cur, poll_end;
bool waited = false;
u64 block_ns;
@ -3295,7 +3296,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
kvm_arch_vcpu_blocking(vcpu);
start = cur = poll_end = ktime_get();
if (vcpu->halt_poll_ns && halt_poll_allowed) {
if (do_halt_poll) {
ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
++vcpu->stat.generic.halt_attempted_poll;
@ -3347,8 +3348,9 @@ out:
kvm_arch_vcpu_unblocking(vcpu);
block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
update_halt_poll_stats(
vcpu, ktime_to_ns(ktime_sub(poll_end, start)), waited);
if (do_halt_poll)
update_halt_poll_stats(
vcpu, ktime_to_ns(ktime_sub(poll_end, start)), waited);
if (halt_poll_allowed) {
if (!vcpu_valid_wakeup(vcpu)) {