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Message-ID: <TYAPR01MB633033036DB3C6BA82E085828B4A9@TYAPR01MB6330.jpnprd01.prod.outlook.com>
Date: Tue, 4 Jan 2022 09:35:42 +0000
From: "tan.shaopeng@...itsu.com" <tan.shaopeng@...itsu.com>
To: "tan.shaopeng@...itsu.com" <tan.shaopeng@...itsu.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Shuah Khan <shuah@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: RE: [PATCH v2] selftests/resctrl: Print a message if the result of
MBM&CMT tests is failed when Intel Sub-NUMA is enabled
Hi,
Friendly ping for a review.
>
> If the result of MBM&CMT tests is failed when Intel Sub-NUMA is enabled,
> print a possible causes of failure.
> Since when the Intel Sub-NUMA Clustering(SNC) feature is enabled, the CMT
> and MBM counters may not be accurate.
>
> Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> ---
> Hello,
>
> According to the Intel RDT reference Manual, when the sub-numa clustering
> feature is enabled, the CMT and MBM counters may not be accurate.
> When running CMT tests and MBM tests on 2nd Generation Intel Xeon
> Scalable Processor, the result may be "not ok".
> If result of MBM&CMT tests is failed when Intel Sub-NUMA is enabled, fix it to
> print a possible cause of failure, instead of SKIP these tests in v1.
>
> Thanks,
>
> tools/testing/selftests/resctrl/Makefile | 1 +
> tools/testing/selftests/resctrl/cmt_test.c | 5 ++-
> tools/testing/selftests/resctrl/mbm_test.c | 5 ++-
> tools/testing/selftests/resctrl/resctrl.h | 2 ++
> .../testing/selftests/resctrl/resctrl_tests.c | 36
> +++++++++++++++++++
> tools/testing/selftests/resctrl/resctrlfs.c | 26 ++++++++++++++
> 6 files changed, 73 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/resctrl/Makefile
> b/tools/testing/selftests/resctrl/Makefile
> index adfd92145e12..6d257f40e6ac 100644
> --- a/tools/testing/selftests/resctrl/Makefile
> +++ b/tools/testing/selftests/resctrl/Makefile
> @@ -1,6 +1,7 @@
> #SPDX-License-Identifier: GPL-2.0
>
> CFLAGS += -g -Wall -O2 -D_FORTIFY_SOURCE=2
> +LDLIBS += -lnuma
>
> TEST_GEN_PROGS := resctrl_tests
> EXTRA_SOURCES := $(wildcard *.c)
> diff --git a/tools/testing/selftests/resctrl/cmt_test.c
> b/tools/testing/selftests/resctrl/cmt_test.c
> index 8968e36db99d..c5a49444c5a0 100644
> --- a/tools/testing/selftests/resctrl/cmt_test.c
> +++ b/tools/testing/selftests/resctrl/cmt_test.c
> @@ -136,8 +136,11 @@ int cmt_resctrl_val(int cpu_no, int n, char
> **benchmark_cmd)
> return ret;
>
> ret = check_results(¶m, n);
> - if (ret)
> + if (ret) {
> + if (sub_numa_cluster_enable)
> + ksft_print_msg("Sub-NUMA Clustering(SNC) feature
> is enabled, the CMT
> +counters may not be accurate.\n");
> return ret;
> + }
>
> cmt_test_cleanup();
>
> diff --git a/tools/testing/selftests/resctrl/mbm_test.c
> b/tools/testing/selftests/resctrl/mbm_test.c
> index 8392e5c55ed0..7dc1bdf2d0b8 100644
> --- a/tools/testing/selftests/resctrl/mbm_test.c
> +++ b/tools/testing/selftests/resctrl/mbm_test.c
> @@ -136,8 +136,11 @@ int mbm_bw_change(int span, int cpu_no, char
> *bw_report, char **benchmark_cmd)
> return ret;
>
> ret = check_results(span);
> - if (ret)
> + if (ret) {
> + if (sub_numa_cluster_enable)
> + ksft_print_msg("Sub-NUMA Clustering(SNC) feature
> is enabled, the MBM
> +counters may not be accurate.\n");
> return ret;
> + }
>
> mbm_test_cleanup();
>
> diff --git a/tools/testing/selftests/resctrl/resctrl.h
> b/tools/testing/selftests/resctrl/resctrl.h
> index 1ad10c47e31d..4b8ad4fbd016 100644
> --- a/tools/testing/selftests/resctrl/resctrl.h
> +++ b/tools/testing/selftests/resctrl/resctrl.h
> @@ -76,6 +76,7 @@ extern pid_t bm_pid, ppid;
>
> extern char llc_occup_path[1024];
> extern bool is_amd;
> +extern bool sub_numa_cluster_enable;
>
> bool check_resctrlfs_support(void);
> int filter_dmesg(void);
> @@ -85,6 +86,7 @@ int umount_resctrlfs(void); int
> validate_bw_report_request(char *bw_report); bool
> validate_resctrl_feature_request(const char *resctrl_val); char *fgrep(FILE
> *inf, const char *str);
> +char *fgrep_last_match_line(FILE *inf, const char *str);
> int taskset_benchmark(pid_t bm_pid, int cpu_no); void run_benchmark(int
> signum, siginfo_t *info, void *ucontext); int write_schemata(char *ctrlgrp,
> char *schemata, int cpu_no, diff --git
> a/tools/testing/selftests/resctrl/resctrl_tests.c
> b/tools/testing/selftests/resctrl/resctrl_tests.c
> index 3be0895c492b..bbab4a7f37ed 100644
> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
> @@ -8,12 +8,15 @@
> * Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
> * Fenghua Yu <fenghua.yu@...el.com>
> */
> +#include <numa.h>
> +#include <string.h>
> #include "resctrl.h"
>
> #define BENCHMARK_ARGS 64
> #define BENCHMARK_ARG_SIZE 64
>
> bool is_amd;
> +bool sub_numa_cluster_enable;
>
> void detect_amd(void)
> {
> @@ -34,6 +37,35 @@ void detect_amd(void)
> fclose(inf);
> }
>
> +void check_sub_numa_cluster(void)
> +{
> + FILE *inf = fopen("/proc/cpuinfo", "r");
> + char *res, *s;
> + int socket_num = 0;
> + int numa_nodes = 0;
> +
> + if (!inf)
> + return;
> +
> + res = fgrep_last_match_line(inf, "physical id");
> +
> + if (res) {
> + s = strpbrk(res, "1234567890");
> + socket_num = atoi(s) + 1;
> + free(res);
> + }
> + fclose(inf);
> +
> + numa_nodes = numa_max_node() + 1;
> +
> + /*
> + * when the Sub-NUMA Clustering(SNC) feature is enabled,
> + * the number of numa nodes is twice the number of sockets.
> + */
> + if (numa_nodes == (2 * socket_num))
> + sub_numa_cluster_enable = true;
> +}
> +
> static void cmd_help(void)
> {
> printf("usage: resctrl_tests [-h] [-b \"benchmark_cmd [options]\"]
> [-t test list] [-n no_of_bits]\n"); @@ -210,6 +242,10 @@ int main(int argc, char
> **argv)
> /* Detect AMD vendor */
> detect_amd();
>
> + /* check whether sub numa clustering is enable or not */
> + if (!is_amd)
> + check_sub_numa_cluster();
> +
> if (has_ben) {
> /* Extract benchmark command from command line. */
> for (i = ben_ind; i < argc; i++) {
> diff --git a/tools/testing/selftests/resctrl/resctrlfs.c
> b/tools/testing/selftests/resctrl/resctrlfs.c
> index 5f5a166ade60..1908ecb14b70 100644
> --- a/tools/testing/selftests/resctrl/resctrlfs.c
> +++ b/tools/testing/selftests/resctrl/resctrlfs.c
> @@ -605,6 +605,32 @@ char *fgrep(FILE *inf, const char *str)
> return NULL;
> }
>
> +/*
> + * Find the last matched line.
> + * Return a pointer to the string of the matched line,
> + * else retuen NULL if no matched line
> + */
> +char *fgrep_last_match_line(FILE *inf, const char *str) {
> + char line[256];
> + char result_line[256];
> + int slen = strlen(str);
> +
> + while (!feof(inf)) {
> + if (!fgets(line, 256, inf))
> + break;
> + if (strncmp(line, str, slen))
> + continue;
> +
> + strcpy(result_line, line);
> + }
> +
> + if (strlen(result_line) >= slen)
> + return strdup(result_line);
> +
> + return NULL;
> +}
> +
> /*
> * validate_resctrl_feature_request - Check if requested feature is valid.
> * @resctrl_val: Requested feature
> --
> 2.27.0
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