[PATCH v5 0/5] dirty_log_perf_test vCPU pinning

[Vipin Sharma]

Pin vCPUs to a host physical CPUs (pCPUs) in dirty_log_perf_test and
optionally pin the main application thread to a physical cpu if
provided. All tests based on perf_test_util framework can take advantage
of it if needed.

While at it, I changed atoi() to atoi_paranoid(), atoi_positive,
atoi_non_negative() in other tests, sorted command line options
alphabetically in dirty_log_perf_test, and added break between -e and -g
which was missed in original commit when -e was introduced.

v5:
- Added atoi_postive() and atoi_non_negative() APIs for string parsing.
- Using sched_getaffinity() to verify if a pCPU is allowed or not.
- Changed Suggested-by to add only person came up with original idea of
  pinning.
- Updated strings and commit messages.

v4: https://lore.kernel.org/lkml/20221006171133.372359-1-vipinsh@xxxxxxxxxx/
- Moved boolean to check vCPUs pinning from perf_test_vcpu_args to
  perf_test_args.
- Changed assert statements to make error more descriptive.
- Modified break statement between 'e' and 'g' option in v3 by not copying
  dirty_log_manual_caps = 0 to 'e'.

v3: https://lore.kernel.org/lkml/20220826184500.1940077-1-vipinsh@xxxxxxxxxx
- Moved atoi_paranoid() to test_util.c and replaced all atoi() usage
  with atoi_paranoid()
- Sorted command line options alphabetically.
- Instead of creating a vcpu thread on a specific pcpu the thread will
  migrate to the provided pcpu after its creation.
- Decoupled -e and -g option.

v2: https://lore.kernel.org/lkml/20220819210737.763135-1-vipinsh@xxxxxxxxxx/
- Removed -d option.
- One cpu list passed as option, cpus for vcpus, followed by
  application thread cpu.
- Added paranoid cousin of atoi().

v1: https://lore.kernel.org/lkml/20220817152956.4056410-1-vipinsh@xxxxxxxxxx

Vipin Sharma (5):
  KVM: selftests: Add missing break between -e and -g option in
    dirty_log_perf_test
  KVM: selftests: Put command line options in alphabetical order in
    dirty_log_perf_test
  KVM: selftests: Add atoi_paranoid() to catch errors missed by atoi()
  KVM: selftests: Add atoi_positive() and atoi_non_negative() for input
    validation
  KVM: selftests: Run dirty_log_perf_test on specific CPUs

 .../selftests/kvm/aarch64/arch_timer.c        | 25 ++-----
 .../testing/selftests/kvm/aarch64/vgic_irq.c  |  6 +-
 .../selftests/kvm/access_tracking_perf_test.c |  2 +-
 .../selftests/kvm/demand_paging_test.c        |  4 +-
 .../selftests/kvm/dirty_log_perf_test.c       | 62 ++++++++++++------
 .../selftests/kvm/include/perf_test_util.h    |  6 ++
 .../testing/selftests/kvm/include/test_util.h |  4 ++
 .../selftests/kvm/kvm_page_table_test.c       |  4 +-
 .../selftests/kvm/lib/perf_test_util.c        | 65 ++++++++++++++++++-
 tools/testing/selftests/kvm/lib/test_util.c   | 35 ++++++++++
 .../selftests/kvm/max_guest_memory_test.c     |  7 +-
 .../kvm/memslot_modification_stress_test.c    |  6 +-
 .../testing/selftests/kvm/memslot_perf_test.c | 24 ++-----
 .../selftests/kvm/set_memory_region_test.c    |  2 +-
 .../selftests/kvm/x86_64/nx_huge_pages_test.c |  4 +-
 15 files changed, 178 insertions(+), 78 deletions(-)

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2.38.0.rc1.362.ged0d419d3c-goog