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Fri, 31 Jul 2026 10:06:26 -0700 (PDT) Date: Fri, 31 Jul 2026 10:06:10 -0700 In-Reply-To: <20260731170619.2620845-1-seanjc@google.com> Mime-Version: 1.0 References: <20260731170619.2620845-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.508.g3f0d502094-goog Message-ID: <20260731170619.2620845-4-seanjc@google.com> Subject: [PATCH v2 03/12] KVM: selftests: Pre-set threads affinity in hardware disable test when possible From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson Cc: Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260731_100627_744264_29C4363A X-CRM114-Status: GOOD ( 11.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When building against a libc that provides pthread_attr_setaffinity_np(), pre-set the grandchildren threads CPU affinity in the hardware disable test to further reduce the perceived latency of pthread_create(). On large NUMA systems, this reduces the average runtime from ~10s to ~3.5s. Signed-off-by: Sean Christopherson --- .../testing/selftests/kvm/hardware_disable_test.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/hardware_disable_test.c b/tools/testing/selftests/kvm/hardware_disable_test.c index f088b4af3ccc..d8288147b0a6 100644 --- a/tools/testing/selftests/kvm/hardware_disable_test.c +++ b/tools/testing/selftests/kvm/hardware_disable_test.c @@ -36,7 +36,9 @@ static void *run_vcpu(void *arg) struct kvm_vcpu *vcpu = arg; struct kvm_run *run = vcpu->run; +#ifndef __USE_GNU kvm_sched_setaffinity(0, sizeof(cpu_set_t), &threads_cpu_set); +#endif vcpu_run(vcpu); @@ -50,7 +52,9 @@ static void *sleeping_thread(void *arg) { int fd; +#ifndef __USE_GNU kvm_sched_setaffinity(0, sizeof(cpu_set_t), &threads_cpu_set); +#endif while (true) { fd = open("/dev/null", O_RDWR); @@ -80,22 +84,28 @@ static inline void check_join(pthread_t thread, void **retval) static void run_test(u32 run) { struct kvm_vcpu *vcpu; + pthread_attr_t attr; struct kvm_vm *vm; pthread_t threads[VCPU_NUM]; pthread_t throw_away; void *b; u32 i, j; + pthread_attr_init(&attr); +#ifdef __USE_GNU + pthread_attr_setaffinity_np(&attr, sizeof(cpu_set_t), &threads_cpu_set); +#endif + vm = vm_create(VCPU_NUM); pr_debug("%s: [%d] start vcpus\n", __func__, run); for (i = 0; i < VCPU_NUM; ++i) { vcpu = vm_vcpu_add(vm, i, guest_code); - check_create_thread(&threads[i], NULL, run_vcpu, vcpu); + check_create_thread(&threads[i], &attr, run_vcpu, vcpu); for (j = 0; j < SLEEPING_THREAD_NUM; ++j) { - check_create_thread(&throw_away, NULL, sleeping_thread, + check_create_thread(&throw_away, &attr, sleeping_thread, (void *)NULL); } } -- 2.55.0.508.g3f0d502094-goog