[PATCH v2 4/7] selftests/resctrl: Simplify span lifetime
From: Ilpo Järvinen
Date: Mon Aug 21 2023 - 06:24:02 EST
struct resctrl_val_param contains span member. resctrl_val(), however,
never uses it because the value of span is embedded into the default
benchmark command and parsed from it by run_benchmark().
Remove span from resctrl_val_param. Provide DEFAULT_SPAN for the code
that needs it. CMT and CAT tests communicate span that is different
from the DEFAULT_SPAN between their internal functions which is
converted into passing it directly as a parameter.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
---
tools/testing/selftests/resctrl/cache.c | 5 +++--
tools/testing/selftests/resctrl/cat_test.c | 13 +++++++------
tools/testing/selftests/resctrl/cmt_test.c | 11 ++++++-----
tools/testing/selftests/resctrl/mbm_test.c | 5 ++---
tools/testing/selftests/resctrl/resctrl.h | 8 ++++----
tools/testing/selftests/resctrl/resctrl_tests.c | 9 ++++-----
6 files changed, 26 insertions(+), 25 deletions(-)
diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index d3cbb829ff6a..a0318bd3a63d 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -205,10 +205,11 @@ int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
* cache_val: execute benchmark and measure LLC occupancy resctrl
* and perf cache miss for the benchmark
* @param: parameters passed to cache_val()
+ * @span: buffer size for the benchmark
*
* Return: 0 on success. non-zero on failure.
*/
-int cat_val(struct resctrl_val_param *param)
+int cat_val(struct resctrl_val_param *param, size_t span)
{
int memflush = 1, operation = 0, ret = 0;
char *resctrl_val = param->resctrl_val;
@@ -245,7 +246,7 @@ int cat_val(struct resctrl_val_param *param)
if (ret)
break;
- if (run_fill_buf(param->span, memflush, operation, true)) {
+ if (run_fill_buf(span, memflush, operation, true)) {
fprintf(stderr, "Error-running fill buffer\n");
ret = -1;
goto pe_close;
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 3848dfb46aba..97b87285ab2a 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -41,7 +41,7 @@ static int cat_setup(struct resctrl_val_param *p)
return ret;
}
-static int check_results(struct resctrl_val_param *param)
+static int check_results(struct resctrl_val_param *param, size_t span)
{
char *token_array[8], temp[512];
unsigned long sum_llc_perf_miss = 0;
@@ -76,7 +76,7 @@ static int check_results(struct resctrl_val_param *param)
fclose(fp);
no_of_bits = count_bits(param->mask);
- return show_cache_info(sum_llc_perf_miss, no_of_bits, param->span / 64,
+ return show_cache_info(sum_llc_perf_miss, no_of_bits, span / 64,
MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
get_vendor() == ARCH_INTEL, false);
}
@@ -96,6 +96,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
char cbm_mask[256];
int count_of_bits;
char pipe_message;
+ size_t span;
/* Get default cbm mask for L3/L2 cache */
ret = get_cbm_mask(cache_type, cbm_mask);
@@ -140,7 +141,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
/* Set param values for parent thread which will be allocated bitmask
* with (max_bits - n) bits
*/
- param.span = cache_size * (count_of_bits - n) / count_of_bits;
+ span = cache_size * (count_of_bits - n) / count_of_bits;
strcpy(param.ctrlgrp, "c2");
strcpy(param.mongrp, "m2");
strcpy(param.filename, RESULT_FILE_NAME2);
@@ -162,7 +163,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
param.mask = l_mask_1;
strcpy(param.ctrlgrp, "c1");
strcpy(param.mongrp, "m1");
- param.span = cache_size * n / count_of_bits;
+ span = cache_size * n / count_of_bits;
strcpy(param.filename, RESULT_FILE_NAME1);
param.num_of_runs = 0;
param.cpu_no = sibling_cpu_no;
@@ -176,9 +177,9 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
remove(param.filename);
- ret = cat_val(¶m);
+ ret = cat_val(¶m, span);
if (ret == 0)
- ret = check_results(¶m);
+ ret = check_results(¶m, span);
if (bm_pid == 0) {
/* Tell parent that child is ready */
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index cb2197647c6c..9d8e38e995ef 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -27,7 +27,7 @@ static int cmt_setup(struct resctrl_val_param *p)
return 0;
}
-static int check_results(struct resctrl_val_param *param, int no_of_bits)
+static int check_results(struct resctrl_val_param *param, size_t span, int no_of_bits)
{
char *token_array[8], temp[512];
unsigned long sum_llc_occu_resc = 0;
@@ -58,7 +58,7 @@ static int check_results(struct resctrl_val_param *param, int no_of_bits)
}
fclose(fp);
- return show_cache_info(sum_llc_occu_resc, no_of_bits, param->span,
+ return show_cache_info(sum_llc_occu_resc, no_of_bits, span,
MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
true, true);
}
@@ -74,6 +74,7 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
unsigned long long_mask;
char cbm_mask[256];
int count_of_bits;
+ size_t span;
int ret;
if (!validate_resctrl_feature_request(CMT_STR))
@@ -105,13 +106,13 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
.cpu_no = cpu_no,
.filename = RESULT_FILE_NAME,
.mask = ~(long_mask << n) & long_mask,
- .span = cache_size * n / count_of_bits,
.num_of_runs = 0,
.setup = cmt_setup,
};
+ span = cache_size * n / count_of_bits;
if (strcmp(benchmark_cmd[0], "fill_buf") == 0)
- sprintf(benchmark_cmd[1], "%zu", param.span);
+ sprintf(benchmark_cmd[1], "%zu", span);
remove(RESULT_FILE_NAME);
@@ -119,7 +120,7 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
if (ret)
goto out;
- ret = check_results(¶m, n);
+ ret = check_results(¶m, span, n);
out:
cmt_test_cleanup();
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 3e4a800e0e40..b830fc84338b 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -109,13 +109,12 @@ void mbm_test_cleanup(void)
remove(RESULT_FILE_NAME);
}
-int mbm_bw_change(size_t span, int cpu_no, char **benchmark_cmd)
+int mbm_bw_change(int cpu_no, char **benchmark_cmd)
{
struct resctrl_val_param param = {
.resctrl_val = MBM_STR,
.ctrlgrp = "c1",
.mongrp = "m1",
- .span = span,
.cpu_no = cpu_no,
.filename = RESULT_FILE_NAME,
.bw_report = "reads",
@@ -129,7 +128,7 @@ int mbm_bw_change(size_t span, int cpu_no, char **benchmark_cmd)
if (ret)
goto out;
- ret = check_results(span);
+ ret = check_results(DEFAULT_SPAN);
out:
mbm_test_cleanup();
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index f3446ac664c2..bcd0d2060f81 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -38,6 +38,8 @@
#define END_OF_TESTS 1
+#define DEFAULT_SPAN (250 * MB)
+
#define PARENT_EXIT(err_msg) \
do { \
perror(err_msg); \
@@ -52,7 +54,6 @@
* @ctrlgrp: Name of the control monitor group (con_mon grp)
* @mongrp: Name of the monitor group (mon grp)
* @cpu_no: CPU number to which the benchmark would be binded
- * @span: Memory bytes accessed in each benchmark iteration
* @filename: Name of file to which the o/p should be written
* @bw_report: Bandwidth report type (reads vs writes)
* @setup: Call back function to setup test environment
@@ -62,7 +63,6 @@ struct resctrl_val_param {
char ctrlgrp[64];
char mongrp[64];
int cpu_no;
- size_t span;
char filename[64];
char *bw_report;
unsigned long mask;
@@ -98,7 +98,7 @@ int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
int group_fd, unsigned long flags);
int run_fill_buf(size_t span, int memflush, int op, bool once);
int resctrl_val(char **benchmark_cmd, struct resctrl_val_param *param);
-int mbm_bw_change(size_t span, int cpu_no, char **benchmark_cmd);
+int mbm_bw_change(int cpu_no, char **benchmark_cmd);
void tests_cleanup(void);
void mbm_test_cleanup(void);
int mba_schemata_change(int cpu_no, char **benchmark_cmd);
@@ -108,7 +108,7 @@ int get_cache_size(int cpu_no, char *cache_type, unsigned long *cache_size);
void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
int signal_handler_register(void);
void signal_handler_unregister(void);
-int cat_val(struct resctrl_val_param *param);
+int cat_val(struct resctrl_val_param *param, size_t span);
void cat_test_cleanup(void);
int cat_perf_miss_val(int cpu_no, int no_of_bits, char *cache_type);
int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd);
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index af0d32abf08e..d4ce8592466c 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -70,7 +70,7 @@ void tests_cleanup(void)
cat_test_cleanup();
}
-static void run_mbm_test(char **benchmark_cmd, size_t span, int cpu_no)
+static void run_mbm_test(char **benchmark_cmd, int cpu_no)
{
int res;
@@ -87,7 +87,7 @@ static void run_mbm_test(char **benchmark_cmd, size_t span, int cpu_no)
goto umount;
}
- res = mbm_bw_change(span, cpu_no, benchmark_cmd);
+ res = mbm_bw_change(cpu_no, benchmark_cmd);
ksft_test_result(!res, "MBM: bw change\n");
if ((get_vendor() == ARCH_INTEL) && res)
ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
@@ -177,7 +177,6 @@ int main(int argc, char **argv)
int c, cpu_no = 1, argc_new = argc, i, no_of_bits = 0;
char *benchmark_cmd[BENCHMARK_ARGS];
int ben_ind, ben_count, tests = 0;
- size_t span = 250 * MB;
bool cat_test = true;
for (i = 0; i < argc; i++) {
@@ -271,7 +270,7 @@ int main(int argc, char **argv)
benchmark_cmd[i] = benchmark_cmd_area[i];
strcpy(benchmark_cmd[0], "fill_buf");
- sprintf(benchmark_cmd[1], "%zu", span);
+ sprintf(benchmark_cmd[1], "%u", DEFAULT_SPAN);
strcpy(benchmark_cmd[2], "1");
strcpy(benchmark_cmd[3], "0");
strcpy(benchmark_cmd[4], "false");
@@ -289,7 +288,7 @@ int main(int argc, char **argv)
ksft_set_plan(tests ? : 4);
if (mbm_test)
- run_mbm_test(benchmark_cmd, span, cpu_no);
+ run_mbm_test(benchmark_cmd, cpu_no);
if (mba_test)
run_mba_test(benchmark_cmd, cpu_no);
--
2.30.2