From nobody Tue Feb 10 05:10:48 2026 Received: from mail.codeweavers.com (mail.codeweavers.com [4.36.192.163]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 766E310A22; Tue, 16 Apr 2024 01:10:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=4.36.192.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713229833; cv=none; b=UG7MLFbLLcNdDMRFsuRR37Bry5SrqZfPvx+MoL4EJKCV7Cn7Emd6NF50aSXxfsIBTZ/rUYOOSPqLSQdYPrNUyhHhHxDerYe9NcMAH57YNg+ZwEJ79V0Ws9IKIZUaQ2UMN1P1++wj81BzhEUWt3f+9OjDNjTPd4kHr8o8SwQF9c0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713229833; c=relaxed/simple; bh=RxzO+9cowicVFB0C8g1tfr/5wcAsZKu2OdxghkIxD54=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jkK3kap3L1jq1tplncf0/zIKLmdwZHtDnLFskWgQgU741ENDJ9VgUehmhFG1uZQHEwro/SDOH6uLNRZsrx1CxWLqT1MxHxfc25jviBZvQFXCy7DCohIpSKM7XUOKmvMXUILfmn94EJTzPmz/OCrD1j8rrqlHoiJTpZ+meCV3tlw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeweavers.com; spf=pass smtp.mailfrom=codeweavers.com; dkim=pass (2048-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b=qD/chXd8; arc=none smtp.client-ip=4.36.192.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeweavers.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codeweavers.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b="qD/chXd8" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=codeweavers.com; s=s1; h=Message-ID:Date:Subject:Cc:To:From:Sender; bh=oYv/7gpkTd7m3dOtwqdlHd+jUV1xxytJ6Ebv/6cbmco=; b=qD/chXd8GqOIrUevoPCz9DzI5H c/I3ME9OJCm6XQxTp3fsJBY5wqnhLqdFR3t3kTGBSglPXDiTZ9ZA2eONHFpkDKB9GvUAxiWX4bXwg gmaKc7tpIiwNzVQ55vMMgAF5C5p1TZuXLiwqLDcDYWTRv4E6t5W1VZEkDumOIJ1v7/cRHrbfeJEpu W3r3Y9VGMnpngG7P4YDp4QGgV9wTZAyDRhq87puYc8EtHWVEYegEAE3FO+Y7BxCdrRWiLpLD9QoQh qkiPCrC+kBD0QEBn2Xx5ciblJ3mbk5hd0yNIMuB+LDFtv79gRupQjpM68cFeOTHOjmjLl/F1EIScO ckOKiKCA==; Received: from cw137ip160.mn.codeweavers.com ([10.69.137.160] helo=camazotz.mn.codeweavers.com) by mail.codeweavers.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1rwXL5-00FbQv-34; Mon, 15 Apr 2024 20:10:24 -0500 From: Elizabeth Figura To: Arnd Bergmann , Greg Kroah-Hartman , Jonathan Corbet , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, wine-devel@winehq.org, =?UTF-8?q?Andr=C3=A9=20Almeida?= , Wolfram Sang , Arkadiusz Hiler , Peter Zijlstra , Andy Lutomirski , linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Randy Dunlap , Ingo Molnar , Will Deacon , Waiman Long , Boqun Feng , Elizabeth Figura Subject: [PATCH v4 25/27] selftests: ntsync: Add a stress test for contended waits. Date: Mon, 15 Apr 2024 20:08:35 -0500 Message-ID: <20240416010837.333694-26-zfigura@codeweavers.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240416010837.333694-1-zfigura@codeweavers.com> References: <20240416010837.333694-1-zfigura@codeweavers.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Test a more realistic usage pattern, and one with heavy contention, in orde= r to actually exercise ntsync's internal synchronization. This test has several threads in a tight loop acquiring a mutex, modifying = some shared data, and then releasing the mutex. At the end we check if the data = is consistent. Signed-off-by: Elizabeth Figura --- .../testing/selftests/drivers/ntsync/ntsync.c | 74 +++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/tools/testing/selftests/drivers/ntsync/ntsync.c b/tools/testin= g/selftests/drivers/ntsync/ntsync.c index 968874d7e325..5fa2c9a0768c 100644 --- a/tools/testing/selftests/drivers/ntsync/ntsync.c +++ b/tools/testing/selftests/drivers/ntsync/ntsync.c @@ -1330,4 +1330,78 @@ TEST(alert_all) close(fd); } =20 +#define STRESS_LOOPS 10000 +#define STRESS_THREADS 4 + +static unsigned int stress_counter; +static int stress_device, stress_start_event, stress_mutex; + +static void *stress_thread(void *arg) +{ + struct ntsync_wait_args wait_args =3D {0}; + __u32 index, count, i; + int ret; + + wait_args.timeout =3D UINT64_MAX; + wait_args.count =3D 1; + wait_args.objs =3D (uintptr_t)&stress_start_event; + wait_args.owner =3D gettid(); + wait_args.index =3D 0xdeadbeef; + + ioctl(stress_device, NTSYNC_IOC_WAIT_ANY, &wait_args); + + wait_args.objs =3D (uintptr_t)&stress_mutex; + + for (i =3D 0; i < STRESS_LOOPS; ++i) { + ioctl(stress_device, NTSYNC_IOC_WAIT_ANY, &wait_args); + + ++stress_counter; + + unlock_mutex(stress_mutex, wait_args.owner, &count); + } + + return NULL; +} + +TEST(stress_wait) +{ + struct ntsync_event_args event_args; + struct ntsync_mutex_args mutex_args; + pthread_t threads[STRESS_THREADS]; + __u32 signaled, i; + int ret; + + stress_device =3D open("/dev/ntsync", O_CLOEXEC | O_RDONLY); + ASSERT_LE(0, stress_device); + + mutex_args.owner =3D 0; + mutex_args.count =3D 0; + ret =3D ioctl(stress_device, NTSYNC_IOC_CREATE_MUTEX, &mutex_args); + EXPECT_EQ(0, ret); + stress_mutex =3D mutex_args.mutex; + + event_args.manual =3D 1; + event_args.signaled =3D 0; + ret =3D ioctl(stress_device, NTSYNC_IOC_CREATE_EVENT, &event_args); + EXPECT_EQ(0, ret); + stress_start_event =3D event_args.event; + + for (i =3D 0; i < STRESS_THREADS; ++i) + pthread_create(&threads[i], NULL, stress_thread, NULL); + + ret =3D ioctl(stress_start_event, NTSYNC_IOC_EVENT_SET, &signaled); + EXPECT_EQ(0, ret); + + for (i =3D 0; i < STRESS_THREADS; ++i) { + ret =3D pthread_join(threads[i], NULL); + EXPECT_EQ(0, ret); + } + + EXPECT_EQ(STRESS_LOOPS * STRESS_THREADS, stress_counter); + + close(stress_start_event); + close(stress_mutex); + close(stress_device); +} + TEST_HARNESS_MAIN --=20 2.43.0