From patchwork Mon Dec 11 12:18:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 753317 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="HtsK4smc" Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DC29186; Mon, 11 Dec 2023 04:20:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1702297248; x=1733833248; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=aQ7Uzjld6F7vOGPv885RCteUq5DHQavMT2G0u/Do9Zc=; b=HtsK4smcewQL/IvFoFAlHJ9nl51+DrIqy5PJAzryRVZQJR3Eo8Ae1+n3 THBsP8t8Vu1slA/oadw+r6xTWR6Rg2qFer4zfVS8tLDVp+vMCfACZWJbM /lnCe36oELlDe0NSrCaOGOz5pkS3MQOaRck9Ok7aiLh6E7Ho2JST9yhVK Sqa8c9QwwhzYlBp6UCpdQXziMO5Ykp+55VNJ2n3ubI2sm9RCU/YIhw6jB kK35n3xyZJZqs83lvk8dIss3mFGZxAtUoWfaknF1c+JfluWoO9N+9EZ1L dMKJIbQ6ciwfjRuJMPdqcv6RzB9jqWcyaY5EpRauB2OKb4uSrpvNuiOYa g==; X-IronPort-AV: E=McAfee;i="6600,9927,10920"; a="1758033" X-IronPort-AV: E=Sophos;i="6.04,267,1695711600"; d="scan'208";a="1758033" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Dec 2023 04:20:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10920"; a="1104461401" X-IronPort-AV: E=Sophos;i="6.04,267,1695711600"; d="scan'208";a="1104461401" Received: from ijarvine-desk1.ger.corp.intel.com (HELO localhost) ([10.246.50.188]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Dec 2023 04:20:43 -0800 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-kselftest@vger.kernel.org, Reinette Chatre , Shuah Khan , Shaopeng Tan , =?utf-8?q?Maciej_Wiecz=C3=B3r-R?= =?utf-8?q?etman?= , Fenghua Yu Cc: linux-kernel@vger.kernel.org, =?utf-8?q?Ilpo_J=C3=A4rvinen?= Subject: [PATCH v3 14/29] selftests/resctrl: Remove nested calls in perf event handling Date: Mon, 11 Dec 2023 14:18:11 +0200 Message-Id: <20231211121826.14392-15-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231211121826.14392-1-ilpo.jarvinen@linux.intel.com> References: <20231211121826.14392-1-ilpo.jarvinen@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Perf event handling has functions that are the sole caller of another perf event handling related function: - reset_enable_llc_perf() calls perf_event_open_llc_miss() - perf_event_measure() calls get_llc_perf() Remove the extra layer of calls to make the code easier to follow by moving the code into the calling function. Signed-off-by: Ilpo Järvinen Reviewed-by: Reinette Chatre --- tools/testing/selftests/resctrl/cache.c | 64 ++++++------------------- 1 file changed, 14 insertions(+), 50 deletions(-) diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c index 11d1a6ce14c2..4f846a2e5e26 100644 --- a/tools/testing/selftests/resctrl/cache.c +++ b/tools/testing/selftests/resctrl/cache.c @@ -29,24 +29,13 @@ static void initialize_perf_event_attr(void) pea_llc_miss.disabled = 1; } +/* Start counters to log values */ static void ioctl_perf_event_ioc_reset_enable(void) { ioctl(fd_lm, PERF_EVENT_IOC_RESET, 0); ioctl(fd_lm, PERF_EVENT_IOC_ENABLE, 0); } -static int perf_event_open_llc_miss(pid_t pid, int cpu_no) -{ - fd_lm = perf_event_open(&pea_llc_miss, pid, cpu_no, -1, - PERF_FLAG_FD_CLOEXEC); - if (fd_lm == -1) { - ksft_perror("Error opening leader"); - return -1; - } - - return 0; -} - static void initialize_llc_perf(void) { memset(&pea_llc_miss, 0, sizeof(struct perf_event_attr)); @@ -62,42 +51,13 @@ static void initialize_llc_perf(void) static int reset_enable_llc_perf(pid_t pid, int cpu_no) { - int ret = 0; - - ret = perf_event_open_llc_miss(pid, cpu_no); - if (ret < 0) - return ret; - - /* Start counters to log values */ - ioctl_perf_event_ioc_reset_enable(); - - return 0; -} - -/* - * get_llc_perf: llc cache miss through perf events - * @llc_perf_miss: LLC miss counter that is filled on success - * - * Perf events like HW_CACHE_MISSES could be used to validate number of - * cache lines allocated. - * - * Return: =0 on success. <0 on failure. - */ -static int get_llc_perf(__u64 *llc_perf_miss) -{ - int ret; - - /* Stop counters after one span to get miss rate */ - - ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0); - - ret = read(fd_lm, &rf_cqm, sizeof(struct read_format)); - if (ret == -1) { - ksft_perror("Could not get llc misses through perf"); + fd_lm = perf_event_open(&pea_llc_miss, pid, cpu_no, -1, PERF_FLAG_FD_CLOEXEC); + if (fd_lm == -1) { + ksft_perror("Error opening leader"); return -1; } - *llc_perf_miss = rf_cqm.values[0].value; + ioctl_perf_event_ioc_reset_enable(); return 0; } @@ -178,14 +138,18 @@ static int print_results_cache(const char *filename, int bm_pid, __u64 llc_value */ static int perf_event_measure(const char *filename, int bm_pid) { - __u64 llc_perf_miss = 0; int ret; - ret = get_llc_perf(&llc_perf_miss); - if (ret < 0) - return ret; + /* Stop counters after one span to get miss rate */ + ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0); + + ret = read(fd_lm, &rf_cqm, sizeof(struct read_format)); + if (ret == -1) { + ksft_perror("Could not get perf value"); + return -1; + } - return print_results_cache(filename, bm_pid, llc_perf_miss); + return print_results_cache(filename, bm_pid, rf_cqm.values[0].value); } /*