From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f199.google.com (mail-pg1-f199.google.com [209.85.215.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECBC5376A15 for ; Fri, 31 Jul 2026 19:56:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785527783; cv=none; b=e/SMJtmKUJ3b3mrlZBybILhCAVZKy6ZR8t7/9DhwcEF2h07imZcDuRezPT2Z+XvwLx/h/XQU4cqWUx7zOp6tT2+nONalgDpDx033tXKoiBIcgm7buX871F2koyeUEWuD/rRPxs0AIcd1/SMqw1UsphfRMe39wAMRZZD4ILN+V00= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785527783; c=relaxed/simple; bh=cFWa99Xo2ScAZGQfMvB0ds8Ya6pH9puVFr0S2RC2rBc=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=WruUl6FY/nLr+tWh+dzTqy/e3ayyoxIcNAfgWCtZTaP6r7vPUlRoiU2Kx9N7oqC95n3AukWgag+6zRjhTEUfDqR+uO9OQa4Mzkl20hscy1+F9Uq4quycnvh/Nlwyf3JLqnlHg1eSRtftJwK187XHPUPm6xhEM3LpqM8rFwyjpNM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Uqmhx+xd; arc=none smtp.client-ip=209.85.215.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Uqmhx+xd" Received: by mail-pg1-f199.google.com with SMTP id 41be03b00d2f7-cab048cdb3eso1679390a12.0 for ; Fri, 31 Jul 2026 12:56:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785527780; x=1786132580; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:reply-to:from:to:cc:subject:date:message-id :reply-to:content-type; bh=QWTFo4fs/kSU6lr4ZzfhIdwS/NOVkYn2PmTaiQ/QINI=; b=Uqmhx+xde/OQk9o3ODE/bJ8K14+7evpgyTRwVq4pNNe1Ja3Va4Xr5mvEtJeeKLLiNb Q5HY382K7kNjMHGs/ozuMEMCIphJKTuN3HsY3i8Z7ouQptTJ7ss3jeuutxP2TLHMpN9w V8oRpkL8Amo8pBM69+OI1BvROvbVw/VaqpSvdsBntP/CLOFzonvxD668UTVe37xdtGMw LfXKmRJkdoHdExvcf4tCqD9YDzzTnr0fYmwmeZ8hkSOZB7dCKOHVzEtwgdoYU1f9NaAb czwJZYpuKRZavKQMNM/9s7JOE/qKtIuyHQk6+o42OxEmJgd89el6wGMqKEYR0LfaGcDW SnEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785527780; x=1786132580; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:reply-to:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=QWTFo4fs/kSU6lr4ZzfhIdwS/NOVkYn2PmTaiQ/QINI=; b=epOgldixsgzNMZq/B9WxF6kwyCH/QBUs0C/b9N9kVigVyaABv32G5/15DqYBbubvNN azNGE+pLLgy3r8/XRlYnxA9Aqq+EmHeHBijU5Em2gSu4NtgpKifGdkj1CiHFf1iOi2bP CYIZEx9cqTBLYqI1Rz2Rrz06Fvi5w8FZY9oNBa9TNcEY+LI6RM99JWkSB0YUT/M/Jigc B7TiqPKlfa0bYYx55OOKNoKDS/hD7fSnL5Q1ODxoCXSiif3lrvhitkdFvlpcaB/grwec /25E5cRQAIjOXNZI+xsHZ3fcnb8aCUMJBv5DDR6hgNShogKRuB+VVJ/cgpuE7SWhqmec 3S4Q== X-Forwarded-Encrypted: i=1; AHgh+RqzpYxsAFsqAI3zRgaPFU34t1wEl2ttT3ZpMfO1IMW0ro0C5idMFFZWSidlDPpCPThqoLxCmh2BwBA0fnc=@vger.kernel.org X-Gm-Message-State: AOJu0YxSMq5t1dsGG0EItW/7YvdYnD+iI1Ywpd4Ul31rFr0CnQqNeNsB 78PO/zbmCA4X4jK5zorz4ktwrvYvnMa00uZCVXjStjgrX2tTFt/e/t3gHuTRrCLhswAN0X+JuBm e02/+VA== X-Received: from pgnp30.prod.google.com ([2002:a63:7f5e:0:b0:cbb:b782:6be1]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:13aa:b0:847:1d73:f753 with SMTP id d2e1a72fcca58-84ee48a4d18mr834507b3a.45.1785527779971; Fri, 31 Jul 2026 12:56:19 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 31 Jul 2026 12:56:03 -0700 In-Reply-To: <20260731195612.2697986-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260731195612.2697986-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.508.g3f0d502094-goog Message-ID: <20260731195612.2697986-4-seanjc@google.com> Subject: [PATCH v3 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" 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 ~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..b4edeadfa3f4 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 _GNU_SOURCE 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 _GNU_SOURCE 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; + TEST_ASSERT_EQ(pthread_attr_init(&attr), 0); +#ifdef _GNU_SOURCE + TEST_ASSERT_EQ(pthread_attr_setaffinity_np(&attr, sizeof(cpu_set_t), &threads_cpu_set), 0); +#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