Currently the population stage in the dirty_log_perf_test does nothing
as the per-vCPU iteration counters are not initialized and the loop does
not wait for each vCPU. Remedy those errors.
Reviewed-by: Jacob Xu <jacobhxu@xxxxxxxxxx>
Reviewed-by: Makarand Sonare <makarandsonare@xxxxxxxxxx>
Signed-off-by: Ben Gardon <bgardon@xxxxxxxxxx>
---
tools/testing/selftests/kvm/dirty_log_perf_test.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c
index 3875f22d7283..fb6eb7fa0b45 100644
--- a/tools/testing/selftests/kvm/dirty_log_perf_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c
@@ -139,14 +139,19 @@ static void run_test(enum vm_guest_mode mode, void *arg)
clock_gettime(CLOCK_MONOTONIC, &start);
for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
+ vcpu_last_completed_iteration[vcpu_id] = -1;
+
pthread_create(&vcpu_threads[vcpu_id], NULL, vcpu_worker,
&perf_test_args.vcpu_args[vcpu_id]);
}
- /* Allow the vCPU to populate memory */
+ /* Allow the vCPUs to populate memory */
pr_debug("Starting iteration %d - Populating\n", iteration);
- while (READ_ONCE(vcpu_last_completed_iteration[vcpu_id]) != iteration)
- ;
+ for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
+ while (READ_ONCE(vcpu_last_completed_iteration[vcpu_id]) !=
+ iteration)
+ ;
+ }
ts_diff = timespec_elapsed(start);
pr_info("Populate memory time: %ld.%.9lds\n",
--
2.30.0.284.gd98b1dd5eaa7-goog
