With more and more resctrl features are being added by Intel, AMD and ARM, a test tool is becoming more and more useful to validate that both hardware and software functionalities work as expected.
We introduce resctrl selftest to cover resctrl features on both X86 and ARM architectures. It first implements MBM (Memory Bandwidth Monitoring) and MBA (Memory Bandwidth Allocation) tests. We can enhance the selftest tool to include more functionality tests in future.
There is an existing resctrl test suite 'intel_cmt_cat'. But the major purpose of the tool is to test Intel(R) RDT hardware via writing and reading MSR registers. It does access resctrl file system; but the functionalities are very limited. And it doesn't support automatic test and a lot of manual verifications are involved.
So the selftest tool we are introducing here provides a convenient tool which does automatic resctrl testing, is easily available in kernel tree, and will be extended to AMD QoS and ARM MPAM.
The selftest tool is in tools/testing/selftests/resctrl in order to have generic test code for all architectures.
Changelog: v5: - Based the v4 patches submitted by Fenghua Yu and added changes to support AMD. - Changed the function name get_sock_num to get_resource_id. Intel uses socket number for schemata and AMD uses l3 index id. To generalize changed the function name to get_resource_id. - Added the code to detect vendor. - Disabled the few tests for AMD where the test results are not clear. Also AMD does not have IMC. - Fixed few compile issues. - Some cleanup to make each patch independent. - Tested the patches on AMD system. Fenghua, Need your help to test on Intel box. Please feel free to change and resubmit if something broken. - Here is the link for previous version. https://lore.kernel.org/lkml/1545438038-75107-1-git-send-email-fenghua.yu@in...
v4: - address comments from Balu and Randy - Add CAT and CQM tests
v3: - Change code based on comments from Babu Moger - Remove some unnessary code and use pipe to communicate b/w processes
v2: - Change code based on comments from Babu Moger - Clean up other places.
Arshiya Hayatkhan Pathan (4): selftests/resctrl: Add MBM test selftests/resctrl: Add MBA test selftests/resctrl Add Cache QoS Monitoring (CQM) selftest selftests/resctrl: Add Cache Allocation Technology (CAT) selftest
Babu Moger (3): selftests/resctrl: Add vendor detection mechanism selftests/resctrl: Use cache index3 id for AMD schemata masks selftests/resctrl: Disable MBA and MBM tests for AMD
Fenghua Yu (2): selftests/resctrl: Add README for resctrl tests selftests/resctrl: Add the test in MAINTAINERS
Sai Praneeth Prakhya (4): selftests/resctrl: Add basic resctrl file system operations and data selftests/resctrl: Read memory bandwidth from perf IMC counter and from resctrl file system selftests/resctrl: Add callback to start a benchmark selftests/resctrl: Add built in benchmark
MAINTAINERS | 1 + tools/testing/selftests/resctrl/Makefile | 16 + tools/testing/selftests/resctrl/README | 53 ++ tools/testing/selftests/resctrl/cache.c | 275 +++++++++ tools/testing/selftests/resctrl/cat_test.c | 243 ++++++++ tools/testing/selftests/resctrl/cqm_test.c | 169 ++++++ tools/testing/selftests/resctrl/fill_buf.c | 198 +++++++ tools/testing/selftests/resctrl/mba_test.c | 174 ++++++ tools/testing/selftests/resctrl/mbm_test.c | 146 +++++ tools/testing/selftests/resctrl/resctrl.h | 117 ++++ tools/testing/selftests/resctrl/resctrl_tests.c | 243 ++++++++ tools/testing/selftests/resctrl/resctrl_val.c | 727 ++++++++++++++++++++++++ tools/testing/selftests/resctrl/resctrlfs.c | 649 +++++++++++++++++++++ 13 files changed, 3011 insertions(+) create mode 100644 tools/testing/selftests/resctrl/Makefile create mode 100644 tools/testing/selftests/resctrl/README create mode 100644 tools/testing/selftests/resctrl/cache.c create mode 100644 tools/testing/selftests/resctrl/cat_test.c create mode 100644 tools/testing/selftests/resctrl/cqm_test.c create mode 100644 tools/testing/selftests/resctrl/fill_buf.c create mode 100644 tools/testing/selftests/resctrl/mba_test.c create mode 100644 tools/testing/selftests/resctrl/mbm_test.c create mode 100644 tools/testing/selftests/resctrl/resctrl.h create mode 100644 tools/testing/selftests/resctrl/resctrl_tests.c create mode 100644 tools/testing/selftests/resctrl/resctrl_val.c create mode 100644 tools/testing/selftests/resctrl/resctrlfs.c