From patchwork Fri Mar 29 00:06:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elizabeth Figura X-Patchwork-Id: 783784 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 4AA9D8460; Fri, 29 Mar 2024 00:06:40 +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=1711670801; cv=none; b=XiMJLhpLoEJclOWQVQMOwLDsElx2wOW0q+t/eDexN9SRKPo+RBZL9mehsTTgCudyh19CAVC1TEDnQE6u5wraSiXJFGAaLgU4WGkbVLWScWEPyiKEj8hQW7YbxjXt5nw3NauXEN6eQa62YByFCks6efLjpWpkICdvW+JC9Mv2ZFI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711670801; c=relaxed/simple; bh=RxzO+9cowicVFB0C8g1tfr/5wcAsZKu2OdxghkIxD54=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=E5mjWnH0T8DZsyZmd12oYrckl4l3LAcX3SpJ5HUJDlgHAWSTScI1XHpxvcMew9iJ1/VZ3sAaTOo1Dlz7MTLnTYaL5SKjwOIa0BAUKoIQYyGghQ268cLPmPuL+pKTYzI34lttKodSpNtVhhajvhu6pn4dDJSA2AuXYSQ003DAw7s= 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=cvtefutj; 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="cvtefutj" 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=cvtefutjewPm4ztHzjlXXVH2QA CKR9CznPdZhtYpJ9IR//6H41Xgele3B3G+W0GGQIun+fd+/qlgPAkbhHtt4PTPbLy6iizFntlmR38 KugL0LWJTubQoKFy/0zzZ84umjrUVYG59hoToxjz5Rjd0N4spF1CBAkN82q8UPbJIQ400JFumSvDd Yl6IPipKxNzOQfnu1+gFz4pNmN6zqqSAsujEmueQFXLGe2wohiWmCnN88JbVWlaPHw9AEkfLg2XmW 8WWkpsvUX4YbOjkEAp5Y1uATBuj0sBti0BxHFOlZDGcv89jtLREhydn1WjVeEhsSPkzjPoYNuukcG v7ajT2eQ==; 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 1rpzlV-000iik-2s; Thu, 28 Mar 2024 19:06:38 -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_Almeida?= , Wolfram Sang , Arkadiusz Hiler , Peter Zijlstra , Andy Lutomirski , linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Randy Dunlap , Elizabeth Figura Subject: [PATCH v3 28/30] selftests: ntsync: Add a stress test for contended waits. Date: Thu, 28 Mar 2024 19:06:19 -0500 Message-ID: <20240329000621.148791-29-zfigura@codeweavers.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240329000621.148791-1-zfigura@codeweavers.com> References: <20240329000621.148791-1-zfigura@codeweavers.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Test a more realistic usage pattern, and one with heavy contention, in order 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/testing/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); } +#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 = {0}; + __u32 index, count, i; + int ret; + + wait_args.timeout = UINT64_MAX; + wait_args.count = 1; + wait_args.objs = (uintptr_t)&stress_start_event; + wait_args.owner = gettid(); + wait_args.index = 0xdeadbeef; + + ioctl(stress_device, NTSYNC_IOC_WAIT_ANY, &wait_args); + + wait_args.objs = (uintptr_t)&stress_mutex; + + for (i = 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 = open("/dev/ntsync", O_CLOEXEC | O_RDONLY); + ASSERT_LE(0, stress_device); + + mutex_args.owner = 0; + mutex_args.count = 0; + ret = ioctl(stress_device, NTSYNC_IOC_CREATE_MUTEX, &mutex_args); + EXPECT_EQ(0, ret); + stress_mutex = mutex_args.mutex; + + event_args.manual = 1; + event_args.signaled = 0; + ret = ioctl(stress_device, NTSYNC_IOC_CREATE_EVENT, &event_args); + EXPECT_EQ(0, ret); + stress_start_event = event_args.event; + + for (i = 0; i < STRESS_THREADS; ++i) + pthread_create(&threads[i], NULL, stress_thread, NULL); + + ret = ioctl(stress_start_event, NTSYNC_IOC_EVENT_SET, &signaled); + EXPECT_EQ(0, ret); + + for (i = 0; i < STRESS_THREADS; ++i) { + ret = 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