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Date: Tue, 12 Jan 2021 13:42:51 -0800 From: Ben Gardon <bgardon@...gle.com> To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org, linux-kselftest@...r.kernel.org Cc: Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>, Andrew Jones <drjones@...hat.com>, Peter Shier <pshier@...gle.com>, Sean Christopherson <sean.j.christopherson@...el.com>, Thomas Huth <thuth@...hat.com>, Jacob Xu <jacobhxu@...gle.com>, Makarand Sonare <makarandsonare@...gle.com>, Ben Gardon <bgardon@...gle.com> Subject: [PATCH 4/6] KVM: selftests: Fix population stage in dirty_log_perf_test 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@...gle.com> Reviewed-by: Makarand Sonare <makarandsonare@...gle.com> Signed-off-by: Ben Gardon <bgardon@...gle.com> --- 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
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