[PATCH 4/4] KVM: Reduce atomic operations on vcpu->requests

[Avi Kivity <avi@redhat.com>]

Usually the vcpu->requests bitmap is sparse, so a test_and_clear_bit() for
each request generates a large number of unneeded atomics if a bit is set.

Replace with a separate test/clear sequence.  This is safe since there is
no clear_bit() outside the vcpu thread.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 include/linux/kvm_host.h |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e706c1e..e478f3f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -642,7 +642,12 @@ static inline bool kvm_make_check_request(int req, struct kvm_vcpu *vcpu)
 
 static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
 {
-	return test_and_clear_bit(req, &vcpu->requests);
+	if (test_bit(req, &vcpu->requests)) {
+		clear_bit(req, &vcpu->requests);
+		return true;
+	} else {
+		return false;
+	}
 }
 
 #endif
-- 
1.7.1