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Message-ID: <20250331213025.3602082-1-jthoughton@google.com>
Date: Mon, 31 Mar 2025 21:30:20 +0000
From: James Houghton <jthoughton@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org
Cc: Maxim Levitsky <mlevitsk@...hat.com>, Axel Rasmussen <axelrasmussen@...gle.com>,
Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>, mkoutny@...e.com,
Yosry Ahmed <yosry.ahmed@...ux.dev>, Yu Zhao <yuzhao@...gle.com>,
James Houghton <jthoughton@...gle.com>, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/5] KVM: selftests: access_tracking_perf_test fixes for
NUMA balancing and MGLRU
This series fixes some issues with access_tracking_perf_test when MGLRU
or NUMA balancing are in use.
With MGLRU, touching a page doesn't necessarily clear the Idle flag.
This has come up in the past, and the recommendation was to use MGLRU
generation numbers[1], which this series does.
With NUMA balancing, pages are temporarily mapped as PROT_NONE, so the
SPTEs will be zapped, losing the Accessed bits. The fix here is, in the
event we have lost access information to print a warning and continue
with the test, just like what we do if the test is running a nested VM.
A flag is added for the user to specify if they wish for the test to
always enforce or always skip this check.
Based on kvm/next.
Changelog:
v1[2] -> v2:
- Re-add clone3_selftests.h for cgroup selftests (thanks Michal!)
- Some comment fixes, patches 2 and 5 (thanks Maxim!).
[1]: https://lore.kernel.org/all/CAOUHufZeADNp_y=Ng+acmMMgnTR=ZGFZ7z-m6O47O=CmJauWjw@mail.gmail.com/
[2]: https://lore.kernel.org/kvm/20250327012350.1135621-1-jthoughton@google.com/
James Houghton (3):
cgroup: selftests: Move cgroup_util into its own library
KVM: selftests: Build and link selftests/cgroup/lib into KVM selftests
KVM: selftests: access_tracking_perf_test: Use MGLRU for access
tracking
Maxim Levitsky (1):
KVM: selftests: access_tracking_perf_test: Add option to skip the
sanity check
Sean Christopherson (1):
KVM: selftests: Extract guts of THP accessor to standalone sysfs
helpers
tools/testing/selftests/cgroup/Makefile | 21 +-
.../selftests/cgroup/{ => lib}/cgroup_util.c | 2 +-
.../cgroup/{ => lib/include}/cgroup_util.h | 4 +-
.../testing/selftests/cgroup/lib/libcgroup.mk | 14 +
tools/testing/selftests/kvm/Makefile.kvm | 4 +-
.../selftests/kvm/access_tracking_perf_test.c | 263 ++++++++++--
.../selftests/kvm/include/lru_gen_util.h | 51 +++
.../testing/selftests/kvm/include/test_util.h | 1 +
.../testing/selftests/kvm/lib/lru_gen_util.c | 383 ++++++++++++++++++
tools/testing/selftests/kvm/lib/test_util.c | 42 +-
10 files changed, 728 insertions(+), 57 deletions(-)
rename tools/testing/selftests/cgroup/{ => lib}/cgroup_util.c (99%)
rename tools/testing/selftests/cgroup/{ => lib/include}/cgroup_util.h (99%)
create mode 100644 tools/testing/selftests/cgroup/lib/libcgroup.mk
create mode 100644 tools/testing/selftests/kvm/include/lru_gen_util.h
create mode 100644 tools/testing/selftests/kvm/lib/lru_gen_util.c
base-commit: 782f9feaa9517caf33186dcdd6b50a8f770ed29b
--
2.49.0.472.ge94155a9ec-goog
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