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Message-Id: <20240311135230.7007-10-ilpo.jarvinen@linux.intel.com>
Date: Mon, 11 Mar 2024 15:52:26 +0200
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: linux-kselftest@...r.kernel.org,
Reinette Chatre <reinette.chatre@...el.com>,
Shuah Khan <shuah@...nel.org>,
Babu Moger <babu.moger@....com>,
Maciej Wieczór-Retman <maciej.wieczor-retman@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>,
linux-kernel@...r.kernel.org,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v2 09/13] selftests/resctrl: Simplify bandwidth report type handling
bw_report is only needed for selecting the correct value from the
values IMC measured. It is a member in the resctrl_val_param struct and
is always set to "reads". The value is then checked in resctrl_val()
using validate_bw_report_request() that besides validating the input,
assumes it can mutate the string which is questionable programming
practice.
Simplify handling bw_report:
- Convert validate_bw_report_request() into get_bw_report_type() that
inputs and returns const char *. Use NULL to indicate error.
- Validate the report types inside measure_mem_bw(), not in
resctrl_val().
- As resctrl_val() no longer needs bw_report for anything, it can just
be passed to measure_mem_bw() by the ->measure() hooks.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
v2:
- Rebased on top of next to resolve conflict in resctrl.h
---
tools/testing/selftests/resctrl/mba_test.c | 3 +--
tools/testing/selftests/resctrl/mbm_test.c | 3 +--
tools/testing/selftests/resctrl/resctrl.h | 7 +++----
tools/testing/selftests/resctrl/resctrl_val.c | 19 +++++++++----------
tools/testing/selftests/resctrl/resctrlfs.c | 13 ++++++-------
5 files changed, 20 insertions(+), 25 deletions(-)
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index 22c1f5e43352..89ad7f2cdd65 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -75,7 +75,7 @@ static int mba_setup(const struct resctrl_test *test,
static int mba_measure(const struct user_params *uparams,
struct resctrl_val_param *param, pid_t bm_pid)
{
- return measure_mem_bw(uparams, param, bm_pid, mbm_total_path);
+ return measure_mem_bw(uparams, param, bm_pid, mbm_total_path, "reads");
}
static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
@@ -176,7 +176,6 @@ static int mba_run_test(const struct resctrl_test *test, const struct user_param
.ctrlgrp = "c1",
.mongrp = "m1",
.filename = RESULT_FILE_NAME,
- .bw_report = "reads",
.init = set_mba_path,
.setup = mba_setup,
.measure = mba_measure,
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index ffbfcecf9bd6..c8c9aba81db8 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -129,7 +129,7 @@ static int mbm_setup(const struct resctrl_test *test,
static int mbm_measure(const struct user_params *uparams,
struct resctrl_val_param *param, pid_t bm_pid)
{
- return measure_mem_bw(uparams, param, bm_pid, mbm_total_path);
+ return measure_mem_bw(uparams, param, bm_pid, mbm_total_path, "reads");
}
void mbm_test_cleanup(void)
@@ -144,7 +144,6 @@ static int mbm_run_test(const struct resctrl_test *test, const struct user_param
.ctrlgrp = "c1",
.mongrp = "m1",
.filename = RESULT_FILE_NAME,
- .bw_report = "reads",
.init = set_mbm_path,
.setup = mbm_setup,
.measure = mbm_measure,
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index d9c6443a8524..0931c5c09c4f 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -83,7 +83,6 @@ struct resctrl_test {
* @ctrlgrp: Name of the control monitor group (con_mon grp)
* @mongrp: Name of the monitor group (mon grp)
* @filename: Name of file to which the o/p should be written
- * @bw_report: Bandwidth report type (reads vs writes)
* @init: Callback function to initialize test environment
* @setup: Callback function to setup per test run environment
* @measure: Callback that performs the measurement (a single test)
@@ -93,7 +92,6 @@ struct resctrl_val_param {
char ctrlgrp[64];
char mongrp[64];
char filename[64];
- char *bw_report;
unsigned long mask;
int num_of_runs;
int (*init)(const struct resctrl_val_param *param,
@@ -133,7 +131,7 @@ int filter_dmesg(void);
int get_domain_id(const char *resource, int cpu_no, int *domain_id);
int mount_resctrlfs(void);
int umount_resctrlfs(void);
-int validate_bw_report_request(char *bw_report);
+const char *get_bw_report_type(const char *bw_report);
bool resctrl_resource_exists(const char *resource);
bool resctrl_mon_feature_exists(const char *resource, const char *feature);
bool resource_info_file_exists(const char *resource, const char *file);
@@ -153,7 +151,8 @@ int run_fill_buf(size_t buf_size, int memflush, int op, bool once);
int initialize_mem_bw_imc(void);
int measure_mem_bw(const struct user_params *uparams,
struct resctrl_val_param *param,
- pid_t bm_pid, const char *mbm_total_path);
+ pid_t bm_pid, const char *mbm_total_path,
+ const char *bw_report);
int resctrl_val(const struct resctrl_test *test,
const struct user_params *uparams,
const char * const *benchmark_cmd,
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 1a96298592ed..2f166a5c0c9b 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -320,7 +320,7 @@ static void do_imc_mem_bw_test(void)
*
* Return: = 0 on success. < 0 on failure.
*/
-static int get_mem_bw_imc(char *bw_report, float *bw_imc)
+static int get_mem_bw_imc(const char *bw_report, float *bw_imc)
{
float reads, writes, of_mul_read, of_mul_write;
int imc, j;
@@ -517,15 +517,21 @@ static int print_results_bw(char *filename, pid_t bm_pid, float bw_imc,
* @param: parameters passed to resctrl_val()
* @bm_pid: PID that runs the benchmark
* @mbm_total_path: Resctrl FS monitoring file to read mem BW from
+ * @bw_report: Bandwidth report type (reads, writes)
*/
int measure_mem_bw(const struct user_params *uparams,
struct resctrl_val_param *param,
- pid_t bm_pid, const char *mbm_total_path)
+ pid_t bm_pid, const char *mbm_total_path,
+ const char *bw_report)
{
unsigned long bw_resc, bw_resc_start, bw_resc_end;
float bw_imc;
int ret;
+ bw_report = get_bw_report_type(bw_report);
+ if (!bw_report)
+ return -1;
+
/*
* Measure memory bandwidth from resctrl and from
* another source which is perf imc value or could
@@ -547,7 +553,7 @@ int measure_mem_bw(const struct user_params *uparams,
if (ret < 0)
return ret;
- ret = get_mem_bw_imc(param->bw_report, &bw_imc);
+ ret = get_mem_bw_imc(bw_report, &bw_imc);
if (ret < 0)
return ret;
@@ -642,13 +648,6 @@ int resctrl_val(const struct resctrl_test *test,
return ret;
}
- if (!strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR)) ||
- !strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR))) {
- ret = validate_bw_report_request(param->bw_report);
- if (ret)
- return ret;
- }
-
/*
* If benchmark wasn't successfully started by child, then child should
* kill parent, so save parent's pid
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 1cade75176eb..5f113b813253 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -837,22 +837,21 @@ int filter_dmesg(void)
return 0;
}
-int validate_bw_report_request(char *bw_report)
+const char *get_bw_report_type(const char *bw_report)
{
if (strcmp(bw_report, "reads") == 0)
- return 0;
+ return bw_report;
if (strcmp(bw_report, "writes") == 0)
- return 0;
+ return bw_report;
if (strcmp(bw_report, "nt-writes") == 0) {
- strcpy(bw_report, "writes");
- return 0;
+ return "writes";
}
if (strcmp(bw_report, "total") == 0)
- return 0;
+ return bw_report;
fprintf(stderr, "Requested iMC B/W report type unavailable\n");
- return -1;
+ return NULL;
}
int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
--
2.39.2
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