From patchwork Mon Mar 1 06:59:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yanan Wang X-Patchwork-Id: 390651 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 536B2C433E6 for ; Mon, 1 Mar 2021 07:01:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A9FD64E31 for ; Mon, 1 Mar 2021 07:01:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232225AbhCAHBX (ORCPT ); Mon, 1 Mar 2021 02:01:23 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:13394 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232220AbhCAHBR (ORCPT ); Mon, 1 Mar 2021 02:01:17 -0500 Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4Dprgk03yFzjSjg; Mon, 1 Mar 2021 14:58:10 +0800 (CST) Received: from DESKTOP-TMVL5KK.china.huawei.com (10.174.187.128) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.498.0; Mon, 1 Mar 2021 14:59:22 +0800 From: Yanan Wang To: , , CC: Paolo Bonzini , Ben Gardon , "Sean Christopherson" , Vitaly Kuznetsov , Andrew Jones , Peter Xu , Marc Zyngier , Ingo Molnar , Adrian Hunter , Jiri Olsa , "Arnaldo Carvalho de Melo" , Arnd Bergmann , Michael Kerrisk , Thomas Gleixner , , , , Yanan Wang Subject: [RFC PATCH v3 3/8] KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing Date: Mon, 1 Mar 2021 14:59:11 +0800 Message-ID: <20210301065916.11484-4-wangyanan55@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20210301065916.11484-1-wangyanan55@huawei.com> References: <20210301065916.11484-1-wangyanan55@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.187.128] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org 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 Signed-off-by: Yanan Wang --- 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; }