The Memory Bandwidth Allocation (MBA) test iterates through all possible MBA allocations, from 10% (ALLOCATION_MIN) to 100% (ALLOCATION_MAX) with increments of 10% (ALLOCATION_STEP) at each iteration. During each iteration the test measures the actual memory bandwidth NUM_OF_RUNS times to determine the impact of MBA on actual memory bandwidth.
After the MBA test completes all the memory bandwidth measurements are parsed into an array. One array for resctrl Memory Bandwidth Monitoring (MBM) measurements and one array for the Integrated Memory Controller (iMC) measurements. Each array has a hardcoded size of 1024 that is large enough to hold the current test data, but this hardcoded value makes the implementation difficult to understand. It will not be clear that this array needs to be reconsidered if any of the test parameters are changed.
Replace the magic constant as array size with the test parameters the array size depends on.
Reported-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Closes: https://lore.kernel.org/all/45af2a8c-517d-8f0d-137d-ad0f3f6a3c68@linux.intel... Signed-off-by: Reinette Chatre reinette.chatre@intel.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com --- Changes since V3: - Add Ilpo's Reviewed-by tag.
Changes since V2: - New patch. --- tools/testing/selftests/resctrl/mba_test.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c index 4e6645b172e3..536d9089d2f6 100644 --- a/tools/testing/selftests/resctrl/mba_test.c +++ b/tools/testing/selftests/resctrl/mba_test.c @@ -127,8 +127,9 @@ static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
static int check_results(void) { + unsigned long bw_resc[NUM_OF_RUNS * ALLOCATION_MAX / ALLOCATION_STEP]; + unsigned long bw_imc[NUM_OF_RUNS * ALLOCATION_MAX / ALLOCATION_STEP]; char *token_array[8], output[] = RESULT_FILE_NAME, temp[512]; - unsigned long bw_imc[1024], bw_resc[1024]; int runs; FILE *fp;