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selftests/resctrl: Add MBM test

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MBM (Memory Bandwidth Monitoring) test is the first implemented selftest.
It starts a stressful memory bandwidth benchmark and assigns the
bandwidth pid in a resctrl monitoring group. Read and compare perf IMC
counter and MBM total bytes for the benchmark. The numbers should be
close enough to pass the test.

Default benchmark is built-in fill_buf. But users can specify their
own benchmark by option "-b".

We can add memory bandwidth monitoring for multiple processes in the
future.

Co-developed-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Co-developed-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Fenghua Yu
2020-01-16 13:32:39 -08:00
committed by Shuah Khan
parent a2561b12fe
commit ecdbb911f2
6 changed files with 368 additions and 1 deletions
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tools/testing/selftests/resctrl/resctrlfs.c
+77
View File
@@ -388,6 +388,41 @@ out:
return ret;
}
bool check_resctrlfs_support(void)
{
FILE *inf = fopen("/proc/filesystems", "r");
DIR *dp;
char *res;
bool ret = false;
if (!inf)
return false;
res = fgrep(inf, "nodev\tresctrl\n");
if (res) {
ret = true;
free(res);
}
fclose(inf);
printf("%sok kernel supports resctrl filesystem\n", ret ? "" : "not ");
tests_run++;
dp = opendir(RESCTRL_PATH);
printf("%sok resctrl mountpoint \"%s\" exists\n",
dp ? "" : "not ", RESCTRL_PATH);
if (dp)
closedir(dp);
tests_run++;
printf("# resctrl filesystem %s mounted\n",
find_resctrl_mount(NULL) ? "not" : "is");
return ret;
}
char *fgrep(FILE *inf, const char *str)
{
char line[256];
@@ -433,6 +468,48 @@ bool validate_resctrl_feature_request(char *resctrl_val)
return found;
}
int filter_dmesg(void)
{
char line[1024];
FILE *fp;
int pipefds[2];
pid_t pid;
int ret;
ret = pipe(pipefds);
if (ret) {
perror("pipe");
return ret;
}
pid = fork();
if (pid == 0) {
close(pipefds[0]);
dup2(pipefds[1], STDOUT_FILENO);
execlp("dmesg", "dmesg", NULL);
perror("executing dmesg");
exit(1);
}
close(pipefds[1]);
fp = fdopen(pipefds[0], "r");
if (!fp) {
perror("fdopen(pipe)");
kill(pid, SIGTERM);
return -1;
}
while (fgets(line, 1024, fp)) {
if (strstr(line, "intel_rdt:"))
printf("# dmesg: %s", line);
if (strstr(line, "resctrl:"))
printf("# dmesg: %s", line);
}
fclose(fp);
waitpid(pid, NULL, 0);
return 0;
}
int validate_bw_report_request(char *bw_report)
{
if (strcmp(bw_report, "reads") == 0)