6.11-stable review patch. If anyone has any objections, please let me know.
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From: Reinette Chatre reinette.chatre@intel.com
[ Upstream commit 1b4840395f08e9723a15fea42c2d31090e8375f3 ]
By default the MBM test uses the "fill_buf" benchmark to keep reading from a buffer with size DEFAULT_SPAN while measuring memory bandwidth. User space can provide an alternate benchmark or amend the size of the buffer "fill_buf" should use.
Analysis of the MBM measurements do not require that a buffer be used and thus do not require knowing the size of the buffer if it was used during testing. Even so, the buffer size is printed as informational as part of the MBM test results. What is printed as buffer size is hardcoded as DEFAULT_SPAN, even if the test relied on another benchmark (that may or may not use a buffer) or if user space amended the buffer size.
Ensure that accurate buffer size is printed when using "fill_buf" benchmark and omit the buffer size information if another benchmark is used.
Fixes: ecdbb911f22d ("selftests/resctrl: Add MBM test") Signed-off-by: Reinette Chatre reinette.chatre@intel.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Shuah Khan skhan@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/resctrl/mbm_test.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c index 6b5a3b52d861b..cf08ba5e314e2 100644 --- a/tools/testing/selftests/resctrl/mbm_test.c +++ b/tools/testing/selftests/resctrl/mbm_test.c @@ -40,7 +40,8 @@ show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, size_t span) ksft_print_msg("%s Check MBM diff within %d%%\n", ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT); ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per); - ksft_print_msg("Span (MB): %zu\n", span / MB); + if (span) + ksft_print_msg("Span (MB): %zu\n", span / MB); ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc); ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
@@ -138,15 +139,26 @@ static int mbm_run_test(const struct resctrl_test *test, const struct user_param .setup = mbm_setup, .measure = mbm_measure, }; + char *endptr = NULL; + size_t span = 0; int ret;
remove(RESULT_FILE_NAME);
+ if (uparams->benchmark_cmd[0] && strcmp(uparams->benchmark_cmd[0], "fill_buf") == 0) { + if (uparams->benchmark_cmd[1] && *uparams->benchmark_cmd[1] != '\0') { + errno = 0; + span = strtoul(uparams->benchmark_cmd[1], &endptr, 10); + if (errno || *endptr != '\0') + return -EINVAL; + } + } + ret = resctrl_val(test, uparams, uparams->benchmark_cmd, ¶m); if (ret) return ret;
- ret = check_results(DEFAULT_SPAN); + ret = check_results(span); if (ret && (get_vendor() == ARCH_INTEL)) ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");