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[v2,0/2] Calculate memory access latency stats

Message ID 20230316222752.1911001-1-coltonlewis@google.com (mailing list archive)
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Series Calculate memory access latency stats | expand

Message

Colton Lewis March 16, 2023, 10:27 p.m. UTC 
Sample the latency of memory accesses in dirty_log_perf_test and
report summary stats to give a picture of the latency
distribution. Specifically, focus on the right tail with the 50th,
90th, and 99th percentile reported in ns.

v2:
* rebase to v6.3-rc2
* move counter measurement to common code helpers
* fix page allocation math for only the exact number needed
* add command line argument to control number of samples

v1: https://lore.kernel.org/kvm/20221115173258.2530923-1-coltonlewis@google.com/

Colton Lewis (2):
  KVM: selftests: Provide generic way to read system counter
  KVM: selftests: Print summary stats of memory latency distribution

 .../selftests/kvm/access_tracking_perf_test.c |  3 +-
 .../selftests/kvm/demand_paging_test.c        |  2 +-
 .../selftests/kvm/dirty_log_perf_test.c       | 10 ++-
 .../testing/selftests/kvm/include/kvm_util.h  | 15 ++++
 .../testing/selftests/kvm/include/memstress.h | 10 ++-
 tools/testing/selftests/kvm/lib/kvm_util.c    | 30 ++++++++
 tools/testing/selftests/kvm/lib/memstress.c   | 68 ++++++++++++++++---
 .../kvm/memslot_modification_stress_test.c    |  2 +-
 .../kvm/system_counter_offset_test.c          | 10 +--
 9 files changed, 128 insertions(+), 22 deletions(-)

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2.40.0.rc1.284.g88254d51c5-goog