Changes since v2: - v2: https://lore.kernel.org/linux-patches/[email protected]/ - Rebased on top of v7.0-rc3. - Split "selftests/resctrl: Improve accuracy of cache occupancy test" into changes impacting L3 and L2 respectively. (Ilpo) - "long_mask" -> "full_mask", "return_value" -> "measurement", "org_count" -> "orig_count". (Ilpo) - Use PATH_MAX where appropriate. (Ilpo) - Handle errors first to reduce indentation. (Ilpo) - Detailed changes in changelogs. - No functional changes since v2. Series tested by running 20 iterations of all tests on Emerald Rapids, Granite Rapids, Sapphire Rapids, Ice Lake, Sierra Forest, and Broadwell.
Changes since v1: - v1: https://lore.kernel.org/lkml/[email protected]/ - The new perf interface that resctrl selftests can utilize has been accepted and merged into v7.0-rc2. This series can thus now be considered for inclusion. For reference, commit 6a8a48644c4b ("perf/x86/intel/uncore: Add per-scheduler IMC CAS count events") The resctrl selftest changes making use of the new perf interface are backward compatible. The selftests do not require a v7.0-rc2 kernel to run but the tests can only pass on recent Intel platforms running v7.0-rc2 or later. - Combine the two outstanding resctrl selftest submissions into one series for easier tracking: https://lore.kernel.org/lkml/084e82b5c29d75f16f24af8768d50d39ba0118a5.1769101788.git.reinette.cha...@intel.com/ https://lore.kernel.org/lkml/[email protected]/ - Fix typo in changelog of "selftests/resctrl: Improve accuracy of cache occupancy test": "the data my be in L2" -> "the data may be in L2" - Add Zide Chen's RB tags. Cover letter updated to be accurate wrt perf changes: The resctrl selftests fail on recent Intel platforms. Intermittent failures in the CAT test and permanent failures of MBM and MBA tests on new platforms like Sierra Forest and Granite Rapids. The MBM and MBA resctrl selftests both generate memory traffic and compare the memory bandwidth measurements between the iMC PMUs and MBM to determine pass or fail. Both these tests are failing on recent platforms like Sierra Forest and Granite Rapids that have two events that need to be read and combined for a total memory bandwidth count instead of the single event available on earlier platforms. resctrl selftests prefer to obtain event details via sysfs instead of adding model specific details on which events to read. Enhancements to perf to expose the new event details are available since: commit 6a8a48644c4b ("perf/x86/intel/uncore: Add per-scheduler IMC CAS count events") This series demonstrates use of the new sysfs interface to perf to obtain accurate iMC read memory bandwidth measurements. An additional issue with all the tests is that these selftests are part performance tests and determine pass/fail on performance heuristics selected after running the tests on a variety of platforms. When new platforms arrive the previous heuristics may cause the tests to fail. These failures are not because of an issue with the resctrl subsystem the tests intend to test but because of the architectural changes in the new platforms. Adapt the resctrl tests to not be as sensitive to architectural changes while adjusting the remaining heuristics to ensure tests pass on a variety of platforms. More details in individual patches. Tested by running 100 iterations of all tests on Emerald Rapids, Granite Rapids, Sapphire Rapids, Ice Lake, Sierra Forest, and Broadwell. Reinette Chatre (10): selftests/resctrl: Improve accuracy of cache occupancy test selftests/resctrl: Reduce interference from L2 occupancy during cache occupancy test selftests/resctrl: Do not store iMC counter value in counter config structure selftests/resctrl: Prepare for parsing multiple events per iMC selftests/resctrl: Support multiple events associated with iMC selftests/resctrl: Increase size of buffer used in MBM and MBA tests selftests/resctrl: Raise threshold at which MBM and PMU values are compared selftests/resctrl: Remove requirement on cache miss rate selftests/resctrl: Simplify perf usage in CAT test selftests/resctrl: Reduce L2 impact on CAT test tools/testing/selftests/resctrl/cache.c | 30 ++-- tools/testing/selftests/resctrl/cat_test.c | 41 ++---- tools/testing/selftests/resctrl/cmt_test.c | 36 ++++- tools/testing/selftests/resctrl/fill_buf.c | 4 +- tools/testing/selftests/resctrl/mba_test.c | 6 +- tools/testing/selftests/resctrl/mbm_test.c | 6 +- tools/testing/selftests/resctrl/resctrl.h | 20 ++- tools/testing/selftests/resctrl/resctrl_val.c | 135 +++++++++++++----- 8 files changed, 179 insertions(+), 99 deletions(-) -- 2.50.1
