In addition to function of CLOCK_MONOTONIC, flag CLOCK_MONOTONIC_RAW can also shield possiable impact of NTP, which can provide more robustness.
Suggested-by: Vitaly Kuznetsov vkuznets@redhat.com Signed-off-by: Yanan Wang wangyanan55@huawei.com --- tools/testing/selftests/kvm/demand_paging_test.c | 8 ++++---- tools/testing/selftests/kvm/dirty_log_perf_test.c | 14 +++++++------- tools/testing/selftests/kvm/lib/test_util.c | 2 +- tools/testing/selftests/kvm/steal_time.c | 4 ++-- 4 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c index 5f7a229c3af1..efbf0c1e9130 100644 --- a/tools/testing/selftests/kvm/demand_paging_test.c +++ b/tools/testing/selftests/kvm/demand_paging_test.c @@ -53,7 +53,7 @@ static void *vcpu_worker(void *data) vcpu_args_set(vm, vcpu_id, 1, vcpu_id); run = vcpu_state(vm, vcpu_id);
- clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start);
/* Let the guest access its memory */ ret = _vcpu_run(vm, vcpu_id); @@ -86,7 +86,7 @@ static int handle_uffd_page_request(int uffd, uint64_t addr) copy.len = perf_test_args.host_page_size; copy.mode = 0;
- clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start);
r = ioctl(uffd, UFFDIO_COPY, ©); if (r == -1) { @@ -123,7 +123,7 @@ static void *uffd_handler_thread_fn(void *arg) struct timespec start; struct timespec ts_diff;
- clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); while (!quit_uffd_thread) { struct uffd_msg msg; struct pollfd pollfd[2]; @@ -336,7 +336,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
pr_info("Finished creating vCPUs and starting uffd threads\n");
- clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start);
for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) { pthread_create(&vcpu_threads[vcpu_id], NULL, vcpu_worker, diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c index 04a2641261be..6cff4ccf9525 100644 --- a/tools/testing/selftests/kvm/dirty_log_perf_test.c +++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c @@ -50,7 +50,7 @@ static void *vcpu_worker(void *data) while (!READ_ONCE(host_quit)) { int current_iteration = READ_ONCE(iteration);
- clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); ret = _vcpu_run(vm, vcpu_id); ts_diff = timespec_elapsed(start);
@@ -141,7 +141,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) iteration = 0; host_quit = false;
- clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) { vcpu_last_completed_iteration[vcpu_id] = -1;
@@ -162,7 +162,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) ts_diff.tv_sec, ts_diff.tv_nsec);
/* Enable dirty logging */ - clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); vm_mem_region_set_flags(vm, PERF_TEST_MEM_SLOT_INDEX, KVM_MEM_LOG_DIRTY_PAGES); ts_diff = timespec_elapsed(start); @@ -174,7 +174,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) * Incrementing the iteration number will start the vCPUs * dirtying memory again. */ - clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); iteration++;
pr_debug("Starting iteration %d\n", iteration); @@ -189,7 +189,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) pr_info("Iteration %d dirty memory time: %ld.%.9lds\n", iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
- clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); kvm_vm_get_dirty_log(vm, PERF_TEST_MEM_SLOT_INDEX, bmap);
ts_diff = timespec_elapsed(start); @@ -199,7 +199,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
if (dirty_log_manual_caps) { - clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); kvm_vm_clear_dirty_log(vm, PERF_TEST_MEM_SLOT_INDEX, bmap, 0, host_num_pages);
@@ -212,7 +212,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) }
/* Disable dirty logging */ - clock_gettime(CLOCK_MONOTONIC, &start); + clock_gettime(CLOCK_MONOTONIC_RAW, &start); vm_mem_region_set_flags(vm, PERF_TEST_MEM_SLOT_INDEX, 0); ts_diff = timespec_elapsed(start); pr_info("Disabling dirty logging time: %ld.%.9lds\n", diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index 906c955384e2..c7c0627c6842 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -89,7 +89,7 @@ struct timespec timespec_elapsed(struct timespec start) { struct timespec end;
- clock_gettime(CLOCK_MONOTONIC, &end); + clock_gettime(CLOCK_MONOTONIC_RAW, &end); return timespec_sub(end, start); }
diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c index fcc840088c91..5bc582d3f2a2 100644 --- a/tools/testing/selftests/kvm/steal_time.c +++ b/tools/testing/selftests/kvm/steal_time.c @@ -237,11 +237,11 @@ static void *do_steal_time(void *arg) { struct timespec ts, stop;
- clock_gettime(CLOCK_MONOTONIC, &ts); + clock_gettime(CLOCK_MONOTONIC_RAW, &ts); stop = timespec_add_ns(ts, MIN_RUN_DELAY_NS);
while (1) { - clock_gettime(CLOCK_MONOTONIC, &ts); + clock_gettime(CLOCK_MONOTONIC_RAW, &ts); if (timespec_to_ns(timespec_sub(ts, stop)) >= 0) break; }