From f09205b99832f353088b7c82778b3f8175627620 Mon Sep 17 00:00:00 2001
From: Ben Gardon <bgardon@google.com>
Date: Thu, 23 Jan 2020 10:04:34 -0800
Subject: KVM: selftests: Time guest demand paging
In order to quantify demand paging performance, time guest execution
during demand paging.
Signed-off-by: Ben Gardon <bgardon@google.com>
[Move timespec-diff to test_util.h]
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
tools/testing/selftests/kvm/lib/test_util.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
(limited to 'tools/testing/selftests/kvm/lib/test_util.c')
diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index cbd7f51b07a1..1c0d45afdf36 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -49,3 +49,23 @@ size_t parse_size(const char *size)
return base << shift;
}
+
+int64_t timespec_to_ns(struct timespec ts)
+{
+ return (int64_t)ts.tv_nsec + 1000000000LL * (int64_t)ts.tv_sec;
+}
+
+struct timespec timespec_diff(struct timespec start, struct timespec end)
+{
+ struct timespec temp;
+
+ if ((end.tv_nsec - start.tv_nsec) < 0) {
+ temp.tv_sec = end.tv_sec - start.tv_sec - 1;
+ temp.tv_nsec = 1000000000LL + end.tv_nsec - start.tv_nsec;
+ } else {
+ temp.tv_sec = end.tv_sec - start.tv_sec;
+ temp.tv_nsec = end.tv_nsec - start.tv_nsec;
+ }
+
+ return temp;
+}
--
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