From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6BA72C5516F for ; Fri, 31 Jul 2026 19:56:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:Cc:To: From:Subject:Message-ID:References:Mime-Version:In-Reply-To:Date: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=QWTFo4fs/kSU6lr4ZzfhIdwS/NOVkYn2PmTaiQ/QINI=; b=Zr61EZTHMrtjuCnwlJhuaz8t+1 x5Gtf6XiL6FAdjqPu+UBWu7wwSTo83g/iGqE+6/6gouWtKKdM/OsFmDuEvRgwVOpB/SEj1/CyY4BJ nk7u9apWLEuDxTafCBW5Kk1N5IP8Gs6BuF/+Ounc2SpdE8Q5FOH4pgO24QHGuHnhNgVk0ODiBTfk/ 7VxhId5ewVZjDypld6Jx+oRuYsRmeu0q+YT7Gm/d+i7xeaQJYOwfPgoLBfLrRtjFwoqgY66/k8/yB iELLTIy+HYjDKqT6s3/anOgdcPQBusitbXxthYiOc4D8fAXN3XfWrC/WBghRYWj2rM5Au2tpcXiq3 Dy+meayA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wptLI-0000000DUtE-1X1B; Fri, 31 Jul 2026 19:56:28 +0000 Received: from mail-pg1-x546.google.com ([2607:f8b0:4864:20::546]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wptLB-0000000DUq1-2zMd for linux-arm-kernel@lists.infradead.org; Fri, 31 Jul 2026 19:56:22 +0000 Received: by mail-pg1-x546.google.com with SMTP id 41be03b00d2f7-cab048cdb3eso1679391a12.0 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=lists.infradead.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=M73JbxA3LaMq2rjpQyKiUYWm/bRjJPzqQ2xbgjds1/EU6vKI9ss/vSiglJ+DUZFwkh clx2ToC3ZWaYiJyQ4Z5MJQIayPXdaykJl+VewZL2hXfvUl1CNVc6X5EweJpJBfdy8kAa mkT3Msvv8GD6CmFLnFLadm6aIV1OifVZtYDOB22LV0Xi3jWJZWWf0iy4zo1xKmg36DlF W404YGbbG3/WK8wcp/n88tEYb5QJT1OLWFj2RxwsV9ezI4zm+PYsI/sVoaKME2wVyyxW Xn06mOiomUz8gi7j3exusrnukRqTSXiOZUSNc/vlGE3ufel8jPt+0YGhisQrIKxzwv4g j0hQ== 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=I4bm4jgGJeNG4/5xs7LwEwM8e3y0dVolYeih9RIjAqG2olB8+ViYMFPXhglaHwvBw6 GRVppPTv/CXS5CSGi0AQqo1GZ4t9ZWEs4n8S9aGyiZqVUcS+LVR76b5P7hnpMGAoCNIR ux4IOFiv9x2XAV3tfIWq8DtImQiGeNGuA145EAlKz62+CI6MIPmF4YHt/l9q2cYXFhmG CA+YK/S5oTcj1GxtpS37HRlMUFaZXkuu7CXJJ06mNlUs8WMO6O1PONrZUp0ghiBtCJdH PPTUdAoLOGgLZRwM5VfBLFDX3u5+GZozmV9DaoQrbVGZ3/xN8UGJUOX2C/YabaEogLo/ zqvg== X-Forwarded-Encrypted: i=1; AHgh+Rp5VM/id0qqFHxdyNMQO7384jjBITAmbulr9oJr7TCIAHXKfIfUKxjOvuhf6+Gs7CJESdo34YKWwA5yON1q84Tu@lists.infradead.org X-Gm-Message-State: AOJu0YxmmmwYUl8Txea8sWwa3PbGZ3b4Dl+iAlUa3+UPgKFnJofdXtBw dGa/v4zZ7uY2/A1uyNU3USa4v7AZd5dXsu/gQr5RtWqaUz1TLGi1ImtxVr0d5vPhaVfc8syq/pl 7Xwg0iQ== 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) Date: Fri, 31 Jul 2026 12:56:03 -0700 In-Reply-To: <20260731195612.2697986-1-seanjc@google.com> 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" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260731_125621_755567_E4D2FA53 X-CRM114-Status: GOOD ( 11.13 ) 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 ~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