From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) (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 5C861449B1A for ; Fri, 31 Jul 2026 17:06:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785517588; cv=none; b=d7DmmzIRcgP3Uaa6bTd/Q+CtfdgE53aw0+eNlxP5XDuoFpMegBy2nYCVlv6/O5R5+msw+wRV5ErmhkUPCZ+mw5XGo/Zi7ZxeWwLMXOFk2A2T0kJmka2qIphB9asIwJqoU6idyL3VxfblHBoUy3jDvbsmuxdKuO/50nIlzwgRIm0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785517588; c=relaxed/simple; bh=O/HA18lT4V9uEUyS4D559RXemgyAqdlbEZKAn/jF9Js=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=RsIJ/uAxbM+v22OK0X6i/JEegj0MYOO/HNoVFimD6EnM+25t2cmmxTvYUPUsYff7YxhksjjrF5eU1uSDsmsQnRpjwIqNppXZ4vxiZlMqO+LbOSUq5rRYK9l8Wgzf8EaJ36ooB9QwCS9HY+otL98hWXMiKm88/rBL+xJsc73b/20= 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=Kr95OI8i; arc=none smtp.client-ip=209.85.210.198 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="Kr95OI8i" Received: by mail-pf1-f198.google.com with SMTP id d2e1a72fcca58-848544a8496so1480642b3a.0 for ; Fri, 31 Jul 2026 10:06:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785517587; x=1786122387; 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=i3VSeeQ+TY0YcGO9FGsFVyU5sUODRimnbCxeJHurnMk=; b=Kr95OI8i6I+oJAzJ/+qc4GOrxGjRir/mM8Yb7bWXfpNXmvFQ1YHSX3oYkTVY1PGScV +U1+SMmdSZ0z94gnP+e1kHpY/TSW8RUmhmThxaSo1u28VH6BfVvuyAUuoj+Kkf5E1fUz Jk9F2nSuUvaAJFyyS3qJ4f8ShaGGQyIwb2Anvtow5b/3of00/AQRIHkRpcyvD27LLxJm cnTrWCO7Urnx1oBroYJspVzNJvMU235QluAaIL9FqRroSIk5b1m49nqGPnn+eFdM8rTt 3hrhpWljxmIfBGgNNeGPRbBYlLmT7L7hiLPtYpnx+GArn3Zic2JAh7314nReBBgcBDxL ntMg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785517587; x=1786122387; 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=i3VSeeQ+TY0YcGO9FGsFVyU5sUODRimnbCxeJHurnMk=; b=s8TCI4t/GVQxJ5k056QyQp8g+Z9YNesj+eJirgA5i2ghh4iT5l0sfcjJzoDW3l4+vV deIHkJ43jT7l0ujwC/t1XI2p6kk0usih//+so1bnAaLyhIc3ZYJfgvhIiAWfMOZkYgpo qayezcA9k5I3e7a/R0MB2jS2/WAJ+JmJAQw+NvD3pKPM9by1J2R/IzMtuPp+Q3stRJJv dm9jvia13l3BhRzvqHvY8uZQTPZbtlC/n11osktULuZ4/9C02Ik1sow76uQfc8yEVjNm l0OSnCujyz5U30V0ipZkqf47UmkdotiY5OTzAbnV+L0KBT20/FTA9AtPEuJeaMQNqpAF BhlQ== X-Forwarded-Encrypted: i=1; AHgh+Roq0AFxn886CbVHvXTb2ziVFJd29H0g0LyUpquCf7blDaCigz6uGH5daKS2vMXJrnyGtVi1H79nnUIo2wQ=@vger.kernel.org X-Gm-Message-State: AOJu0Yz8FQ1UaXg+WCx+N0Y4nYMyDSBrqLMNjWroxJprUYwBLlnszKqu NTX8Vy3Jvwoowkaxa8Yb9apBRLuQxMJL4LP2vDojCIKnSka8Xf5esRKYr4XNr2o8Pu2qqD8ZUiU +90MLDQ== X-Received: from pfoc6.prod.google.com ([2002:aa7:8806:0:b0:847:9199:e06]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:ac07:b0:84e:d46f:492a with SMTP id d2e1a72fcca58-84ee496c951mr366009b3a.70.1785517586327; Fri, 31 Jul 2026 10:06:26 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 31 Jul 2026 10:06:10 -0700 In-Reply-To: <20260731170619.2620845-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <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" 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