linux-arm.git - Russell King's ARM Linux kernel tree

Age	Commit message (Collapse)	Author
2022-06-08	KVM: x86/pmu: Drop amd_event_mapping[] in the KVM context	Like Xu
	All gp or fixed counters have been reprogrammed using PERF_TYPE_RAW, which means that the table that maps perf_hw_id to event select values is no longer useful, at least for AMD. For Intel, the logic to check if the pmu event reported by Intel cpuid is not available is still required, in which case pmc_perf_hw_id() could be renamed to hw_event_is_unavail() and a bool value is returned to replace the semantics of "PERF_COUNT_HW_MAX+1". Signed-off-by: Like Xu <likexu@tencent.com> Message-Id: <20220518132512.37864-12-likexu@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-04-13	KVM: x86: Use static calls to reduce kvm_pmu_ops overhead	Like Xu
	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>