diff options
| author | Like Xu <likexu@tencent.com> | 2022-03-29 23:50:54 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-13 13:37:45 -0400 |
| commit | 1921f3aa9263977f6c31b1c3eb2814bff2e84a12 (patch) | |
| tree | c015e1b55f22311ab59645010b56c5bc42d5ce9f /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | 34886e796c413273908b036df57cc9ae731badae (diff) | |
KVM: x86: Use static calls to reduce kvm_pmu_ops overhead
Use static calls to improve kvm_pmu_ops performance, following the same
pattern and naming scheme used by kvm-x86-ops.h.
Here are the worst fenced_rdtsc() cycles numbers for the kvm_pmu_ops
functions that is most often called (up to 7 digits of calls) when running
a single perf test case in a guest on an ICX 2.70GHz host (mitigations=on):
| legacy | static call
------------------------------------------------------------
.pmc_idx_to_pmc | 1304840 | 994872 (+23%)
.pmc_is_enabled | 978670 | 1011750 (-3%)
.msr_idx_to_pmc | 47828 | 41690 (+12%)
.is_valid_msr | 28786 | 30108 (-4%)
Signed-off-by: Like Xu <likexu@tencent.com>
[sean: Handle static call updates in pmu.c, tweak changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220329235054.3534728-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions