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Subject[PATCH V1 12/13] selftests/resctrl: Dynamically select buffer size for CAT test
Date
Presently, while running CAT test case, if user hasn't given any input for
'-n' option, the test defaults to 5 bits to determine the buffer size that
is used during test. Instead of statically running always with 5 bits,
change it such that the buffer size is always half of the cache size.

Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
---
tools/testing/selftests/resctrl/cat_test.c | 16 +++++++++++-----
tools/testing/selftests/resctrl/resctrl.h | 3 ++-
tools/testing/selftests/resctrl/resctrl_tests.c | 7 ++++---
3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index f7a67f005fe5..d1c50430ab20 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -109,7 +109,8 @@ void cat_test_cleanup(void)
remove(RESULT_FILE_NAME);
}

-static int prepare_masks_for_two_processes(int no_of_bits, char *cache_type)
+static int prepare_masks_for_two_processes(int *no_of_bits, bool user_bits,
+ char *cache_type)
{
int ret, i;
unsigned long long_mask, shareable_mask;
@@ -123,12 +124,15 @@ static int prepare_masks_for_two_processes(int no_of_bits, char *cache_type)
long_mask = strtoul(cbm_mask, NULL, 16);
count_of_bits = count_bits(long_mask);

+ if (!user_bits)
+ *no_of_bits = count_of_bits / 2;
+
/*
* Max limit is count_of_bits - 1 because we need exclusive masks for
* the two processes. So, the last saved bit will be used by the other
* process.
*/
- if (no_of_bits < 1 || no_of_bits > count_of_bits - 1) {
+ if (*no_of_bits < 1 || *no_of_bits > count_of_bits - 1) {
printf("Invalid input value for no_of_bits 'n'\n");
printf("Please Enter value in range 1 to %d\n",
count_of_bits - 1);
@@ -140,7 +144,7 @@ static int prepare_masks_for_two_processes(int no_of_bits, char *cache_type)
return ret;

/* Prepare cbm mask without any shareable bits */
- for (i = 0; i < no_of_bits; i++) {
+ for (i = 0; i < *no_of_bits; i++) {
p1_mask <<= 1;
p1_mask |= 1;
}
@@ -176,7 +180,8 @@ static int start_noisy_process(pid_t pid, int sibling_cpu_no)
return 0;
}

-int cat_perf_miss_val(int cpu_no, int no_of_bits, char *cache_type)
+int cat_perf_miss_val(int cpu_no, int no_of_bits, bool user_bits,
+ char *cache_type)
{
int ret, sibling_cpu_no;
unsigned long buf_size;
@@ -194,7 +199,8 @@ int cat_perf_miss_val(int cpu_no, int no_of_bits, char *cache_type)
if (!validate_resctrl_feature_request("cat"))
return -1;

- ret = prepare_masks_for_two_processes(no_of_bits, cache_type);
+ ret = prepare_masks_for_two_processes(&no_of_bits, user_bits,
+ cache_type);
if (ret)
return ret;

diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index cb67ad689475..393f2f34ccac 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -102,7 +102,8 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
int setup_critical_process(pid_t pid, struct resctrl_val_param *param);
int run_critical_process(pid_t pid, struct resctrl_val_param *param);
void cat_test_cleanup(void);
-int cat_perf_miss_val(int cpu_no, int no_of_bits, char *cache_type);
+int cat_perf_miss_val(int cpu_no, int no_of_bits, bool user_bits,
+ char *cache_type);
int cqm_schemata_change(int cpu_no, int span, char *cache_type,
char **benchmark_cmd);
unsigned int count_bits(unsigned long n);
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index 3c408c636b6d..4461c3dc8cce 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -57,11 +57,11 @@ void tests_cleanup(void)
int main(int argc, char **argv)
{
bool has_ben = false, mbm_test = true, mba_test = true, cqm_test = true;
- int res, c, cpu_no = 1, span = 250, argc_new = argc, i, no_of_bits = 5;
+ int res, c, cpu_no = 1, span = 250, argc_new = argc, i, no_of_bits;
char *benchmark_cmd[BENCHMARK_ARGS], bw_report[64], bm_type[64];
char benchmark_cmd_area[BENCHMARK_ARGS][BENCHMARK_ARG_SIZE];
int ben_ind, ben_count;
- bool cat_test = true;
+ bool cat_test = true, user_bits = false;

for (i = 0; i < argc; i++) {
if (strcmp(argv[i], "-b") == 0) {
@@ -105,6 +105,7 @@ int main(int argc, char **argv)
cpu_no = atoi(optarg);
break;
case 'n':
+ user_bits = true;
no_of_bits = atoi(optarg);
break;
case 'h':
@@ -192,7 +193,7 @@ int main(int argc, char **argv)

if (cat_test) {
printf("# Starting CAT test ...\n");
- res = cat_perf_miss_val(cpu_no, no_of_bits, "L3");
+ res = cat_perf_miss_val(cpu_no, no_of_bits, user_bits, "L3");
printf("%sok CAT: test\n", res ? "not " : "");
cat_test_cleanup();
tests_run++;
--
2.7.4
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