From: Reinette Chatre reinette.chatre@intel.com
The resctrl tests can accept a CPU on which the tests are run and use default of CPU #1 if it is not provided. In the CAT test a "sibling CPU" is determined that is from the same package where another thread will be run.
The current algorithm with which a "sibling CPU" is determined does not take the provided/default CPU into account and when that CPU is the first CPU in a package then the "sibling CPU" will be selected to be the same CPU since it starts by picking the first CPU from core_siblings_list.
Fix the "sibling CPU" selection by taking the provided/default CPU into account and ensuring a sibling that is a different CPU is selected.
Fixes: 78941183d1b1 ("selftests/resctrl: Add Cache QoS Monitoring (CQM) selftest") Signed-off-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Sai Praneeth Prakhya sai.praneeth.prakhya@intel.com --- tools/testing/selftests/resctrl/resctrlfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index 67d775d03271..05956319d9ce 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -268,7 +268,7 @@ int get_core_sibling(int cpu_no) while (token) { sibling_cpu_no = atoi(token); /* Skipping core 0 as we don't want to run test on core 0 */ - if (sibling_cpu_no != 0) + if (sibling_cpu_no != 0 && sibling_cpu_no != cpu_no) break; token = strtok(NULL, "-,"); }