[PATCH 12/24] selftests/resctrl: Improve perf init

From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: linux-kselftest@vger.kernel.org,
	"Reinette Chatre" <reinette.chatre@intel.com>,
	"Shuah Khan" <shuah@kernel.org>,
	"Shaopeng Tan" <tan.shaopeng@jp.fujitsu.com>,
	"Maciej Wieczór-Retman" <maciej.wieczor-retman@intel.com>,
	"Fenghua Yu" <fenghua.yu@intel.com>
Cc: linux-kernel@vger.kernel.org,
	"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Subject: [PATCH 12/24] selftests/resctrl: Improve perf init
Date: Tue, 24 Oct 2023 12:26:22 +0300	[thread overview]
Message-ID: <20231024092634.7122-13-ilpo.jarvinen@linux.intel.com> (raw)
In-Reply-To: <20231024092634.7122-1-ilpo.jarvinen@linux.intel.com>

struct perf_event_attr initialization is spread into
perf_event_initialize() and perf_event_attr_initialize() and setting
->config is hardcoded by the deepest level.

perf_event_attr init belongs to perf_event_attr_initialize() so move it
entirely there. Rename the other function
perf_event_initialized_read_format().

Call each init function directly from the test as they will take
different parameters (especially tue after the perf related global
variables are moved to local variables).

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
 tools/testing/selftests/resctrl/cache.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index a70ace82e76e..a84679a4ac0c 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -15,8 +15,9 @@ static struct perf_event_read pe_read;
 static int pe_fd;
 char llc_occup_path[1024];
 
-static void perf_event_attr_initialize(void)
+static void perf_event_attr_initialize(__u64 config)
 {
+	memset(&pea_llc_miss, 0, sizeof(struct perf_event_attr));
 	pea_llc_miss.type = PERF_TYPE_HARDWARE;
 	pea_llc_miss.size = sizeof(struct perf_event_attr);
 	pea_llc_miss.read_format = PERF_FORMAT_GROUP;
@@ -27,18 +28,12 @@ static void perf_event_attr_initialize(void)
 	pea_llc_miss.inherit = 1;
 	pea_llc_miss.exclude_guest = 1;
 	pea_llc_miss.disabled = 1;
+	pea_llc_miss.config = config;
 }
 
-static void perf_event_initialize(void)
+static void perf_event_initialize_read_format(void)
 {
-	memset(&pea_llc_miss, 0, sizeof(struct perf_event_attr));
 	memset(&pe_read, 0, sizeof(struct perf_event_read));
-
-	/* Initialize perf_event_attr structures for HW_CACHE_MISSES */
-	perf_event_attr_initialize();
-
-	pea_llc_miss.config = PERF_COUNT_HW_CACHE_MISSES;
-
 	pe_read.nr = 1;
 }
 
@@ -192,7 +187,8 @@ int cat_val(struct resctrl_val_param *param, size_t span)
 	if (ret)
 		return ret;
 
-	perf_event_initialize();
+	perf_event_attr_initialize(PERF_COUNT_HW_CACHE_MISSES);
+	perf_event_initialize_read_format();
 
 	/* Test runs until the callback setup() tells the test to stop. */
 	while (1) {
-- 
2.30.2

