From patchwork Mon Mar 16 17:37:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Jones X-Patchwork-Id: 11441041 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 417AC17E6 for ; Mon, 16 Mar 2020 17:59:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 16D5D20409 for ; Mon, 16 Mar 2020 17:59:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="PKxTwVWJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732197AbgCPR7m (ORCPT ); Mon, 16 Mar 2020 13:59:42 -0400 Received: from us-smtp-delivery-74.mimecast.com ([63.128.21.74]:44212 "EHLO us-smtp-delivery-74.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730437AbgCPR7l (ORCPT ); Mon, 16 Mar 2020 13:59:41 -0400 X-Greylist: delayed 404 seconds by postgrey-1.27 at vger.kernel.org; Mon, 16 Mar 2020 13:59:40 EDT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584381580; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TRTLneNctVd48m8aoJhsTvpdr5/m+q8kCjqBn4ipaEM=; b=PKxTwVWJoYdFSHrqp0+jaQVVkI9vPe42hx1p1U003fW4K1Y7po4hRuR7Amurn9zRvjkwYj PwMZKzELTHeaHc7NKvw45SDjzg/yc7s4b0WDTR9q14kAPON6JKSgdt3YXZmwUSeptFegpY XhffQWBNfLCmE6Kcm8PxqVs/1lzvdBk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-203-gaHZk79-O-itVKFOwAHkUg-1; Mon, 16 Mar 2020 13:57:34 -0400 X-MC-Unique: gaHZk79-O-itVKFOwAHkUg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5F4E2117CA22 for ; Mon, 16 Mar 2020 17:37:15 +0000 (UTC) Received: from kamzik.brq.redhat.com (ovpn-204-240.brq.redhat.com [10.40.204.240]) by smtp.corp.redhat.com (Postfix) with ESMTP id 38FE17E300; Mon, 16 Mar 2020 17:37:14 +0000 (UTC) From: Andrew Jones To: kvm@vger.kernel.org Cc: pbonzini@redhat.com Subject: [PATCH v2 2/2] KVM: selftests: Rework timespec functions and usage Date: Mon, 16 Mar 2020 18:37:03 +0100 Message-Id: <20200316173703.12785-3-drjones@redhat.com> In-Reply-To: <20200316173703.12785-1-drjones@redhat.com> References: <20200316173703.12785-1-drjones@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The steal_time test's timespec stop condition was wrong and should have used the timespec functions instead to avoid being wrong, but timespec_diff had a strange interface. Rework all the timespec API and its use. Signed-off-by: Andrew Jones --- .../selftests/kvm/demand_paging_test.c | 37 ++++++++----------- .../testing/selftests/kvm/include/test_util.h | 3 +- tools/testing/selftests/kvm/lib/test_util.c | 37 ++++++++----------- tools/testing/selftests/kvm/steal_time.c | 2 +- 4 files changed, 35 insertions(+), 44 deletions(-) diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c index d82f7bc060c3..360cd3ea4cd6 100644 --- a/tools/testing/selftests/kvm/demand_paging_test.c +++ b/tools/testing/selftests/kvm/demand_paging_test.c @@ -117,8 +117,7 @@ static void *vcpu_worker(void *data) struct kvm_vm *vm = args->vm; int vcpu_id = args->vcpu_id; struct kvm_run *run; - struct timespec start; - struct timespec end; + struct timespec start, end, ts_diff; vcpu_args_set(vm, vcpu_id, 1, vcpu_id); run = vcpu_state(vm, vcpu_id); @@ -135,9 +134,9 @@ static void *vcpu_worker(void *data) } clock_gettime(CLOCK_MONOTONIC, &end); - PER_VCPU_DEBUG("vCPU %d execution time: %lld.%.9lds\n", vcpu_id, - (long long)(timespec_diff(start, end).tv_sec), - timespec_diff(start, end).tv_nsec); + ts_diff = timespec_sub(end, start); + PER_VCPU_DEBUG("vCPU %d execution time: %ld.%.9lds\n", vcpu_id, + ts_diff.tv_sec, ts_diff.tv_nsec); return NULL; } @@ -201,8 +200,8 @@ static int handle_uffd_page_request(int uffd, uint64_t addr) clock_gettime(CLOCK_MONOTONIC, &end); - PER_PAGE_DEBUG("UFFDIO_COPY %d \t%lld ns\n", tid, - (long long)timespec_to_ns(timespec_diff(start, end))); + PER_PAGE_DEBUG("UFFDIO_COPY %d \t%ld ns\n", tid, + timespec_to_ns(timespec_sub(end, start))); PER_PAGE_DEBUG("Paged in %ld bytes at 0x%lx from thread %d\n", host_page_size, addr, tid); @@ -224,8 +223,7 @@ static void *uffd_handler_thread_fn(void *arg) int pipefd = uffd_args->pipefd; useconds_t delay = uffd_args->delay; int64_t pages = 0; - struct timespec start; - struct timespec end; + struct timespec start, end, ts_diff; clock_gettime(CLOCK_MONOTONIC, &start); while (!quit_uffd_thread) { @@ -295,11 +293,10 @@ static void *uffd_handler_thread_fn(void *arg) } clock_gettime(CLOCK_MONOTONIC, &end); - PER_VCPU_DEBUG("userfaulted %ld pages over %lld.%.9lds. (%f/sec)\n", - pages, (long long)(timespec_diff(start, end).tv_sec), - timespec_diff(start, end).tv_nsec, pages / - ((double)timespec_diff(start, end).tv_sec + - (double)timespec_diff(start, end).tv_nsec / 100000000.0)); + ts_diff = timespec_sub(end, start); + PER_VCPU_DEBUG("userfaulted %ld pages over %ld.%.9lds. (%f/sec)\n", + pages, ts_diff.tv_sec, ts_diff.tv_nsec, + pages / ((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0)); return NULL; } @@ -360,13 +357,12 @@ static void run_test(enum vm_guest_mode mode, bool use_uffd, pthread_t *vcpu_threads; pthread_t *uffd_handler_threads = NULL; struct uffd_handler_args *uffd_args = NULL; + struct timespec start, end, ts_diff; int *pipefds = NULL; struct kvm_vm *vm; uint64_t guest_num_pages; int vcpu_id; int r; - struct timespec start; - struct timespec end; vm = create_vm(mode, vcpus, vcpu_memory_bytes); @@ -514,12 +510,11 @@ static void run_test(enum vm_guest_mode mode, bool use_uffd, } } - pr_info("Total guest execution time: %lld.%.9lds\n", - (long long)(timespec_diff(start, end).tv_sec), - timespec_diff(start, end).tv_nsec); + ts_diff = timespec_sub(end, start); + pr_info("Total guest execution time: %ld.%.9lds\n", + ts_diff.tv_sec, ts_diff.tv_nsec); pr_info("Overall demand paging rate: %f pgs/sec\n", - guest_num_pages / ((double)timespec_diff(start, end).tv_sec + - (double)timespec_diff(start, end).tv_nsec / 100000000.0)); + guest_num_pages / ((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0)); ucall_uninit(vm); kvm_vm_free(vm); diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h index f588ad1403f1..5eb01bf51b86 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h @@ -61,7 +61,8 @@ void test_assert(bool exp, const char *exp_str, size_t parse_size(const char *size); int64_t timespec_to_ns(struct timespec ts); -struct timespec timespec_diff(struct timespec start, struct timespec end); struct timespec timespec_add_ns(struct timespec ts, int64_t ns); +struct timespec timespec_add(struct timespec ts1, struct timespec ts2); +struct timespec timespec_sub(struct timespec ts1, struct timespec ts2); #endif /* SELFTEST_KVM_TEST_UTIL_H */ diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index ee12c4b9ae05..689e97c27ee2 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -56,36 +56,31 @@ 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; -} - struct timespec timespec_add_ns(struct timespec ts, int64_t ns) { struct timespec res; - res.tv_sec = ts.tv_sec; res.tv_nsec = ts.tv_nsec + ns; - - if (res.tv_nsec > 1000000000UL) { - res.tv_sec += 1; - res.tv_nsec -= 1000000000UL; - } + res.tv_sec = ts.tv_sec + res.tv_nsec / 1000000000LL; + res.tv_nsec %= 1000000000LL; return res; } +struct timespec timespec_add(struct timespec ts1, struct timespec ts2) +{ + int64_t ns1 = timespec_to_ns(ts1); + int64_t ns2 = timespec_to_ns(ts2); + return timespec_add_ns((struct timespec){0}, ns1 + ns2); +} + +struct timespec timespec_sub(struct timespec ts1, struct timespec ts2) +{ + int64_t ns1 = timespec_to_ns(ts1); + int64_t ns2 = timespec_to_ns(ts2); + return timespec_add_ns((struct timespec){0}, ns1 - ns2); +} + void print_skip(const char *fmt, ...) { va_list ap; diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c index 21990d653099..86f30eda0ae7 100644 --- a/tools/testing/selftests/kvm/steal_time.c +++ b/tools/testing/selftests/kvm/steal_time.c @@ -242,7 +242,7 @@ static void *do_steal_time(void *arg) while (1) { clock_gettime(CLOCK_MONOTONIC, &ts); - if (ts.tv_sec > stop.tv_sec || ts.tv_nsec >= stop.tv_nsec) + if (timespec_to_ns(timespec_sub(ts, stop)) >= 0) break; }