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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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2
tools/testing/selftests/resctrl/resctrl_val.c
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@ -435,6 +435,8 @@ pid_t bm_pid, ppid;
static void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
{
kill(bm_pid, SIGKILL);
umount_resctrlfs();
tests_cleanup();
printf("Ending\n\n");
exit(EXIT_SUCCESS);