[kvm-unit-tests,v2,0/5] Fix PMU test failures on Sapphire Rapids

Message

Mi, Dapeng Oct. 31, 2023, 9:29 a.m. UTC

When running pmu test on Intel Sapphire Rapids, we found several
failures are encountered, such as "llc misses" failure, "all counters"
failure and "fixed counter 3" failure.

Intel Sapphire Rapids introduces new fixed counter 3, total PMU counters
including GP and fixed counters increase to 12 and also optimizes cache
subsystem. All these changes make the original assumptions in pmu test
be unavailable any more on Sapphire Rapids. Patches 2-4 fixes these
failures, especially patch 2 improves current loop() function and ensure
the LLC/branch misses are always be triggered and don't depend on the 
possibility like before, patch 1 removes the duplicate code and patch 5
adds asserts to ensure pre-defined fixed events are matched with HW fixed
counters.

Plese note 1) this patchset depends on the Kernel patches "Enable topdown
 slots event in vPMU" 2) this patchset is only tested on Intel Sapphire
rapids platform, the tests on other platforms are welcomed. 


Dapeng Mi (4):
  x86: pmu: Improve loop() to force to generate llc/branch misses
  x86: pmu: Enlarge cnt array length to 64 in check_counters_many()
  x86: pmu: Support validation for Intel PMU fixed counter 3
  x86: pmu: Add asserts to warn inconsistent fixed events and counters

Xiong Zhang (1):
  x86: pmu: Remove duplicate code in pmu_init()

 lib/x86/pmu.c |  5 -----
 x86/pmu.c     | 54 +++++++++++++++++++++++++++++++--------------------
 2 files changed, 33 insertions(+), 26 deletions(-)


base-commit: bfe5d7d0e14c8199d134df84d6ae8487a9772c48