On 2019/10/13 17:15, Like Xu wrote: ... Hi Paolo,
Do you have any concerns or comments for the KVM codes (the last two patches) about this vPMU efficiency optimization?
Thanks, Like Xu
--- Changes in v2: - use perf_event_pause() to disable, read, reset by only one lock; - use __perf_event_read_value() after _perf_event_disable(); - replace bitfields with 'u8 event_count; bool need_cleanup;'; - refine comments and commit messages; - fix two issues reported by kbuild test robot for ARCH=[nds32|sh] v1: https://lore.kernel.org/kvm/[email protected]/ Like Xu (4): perf/core: Provide a kernel-internal interface to recalibrate event period perf/core: Provide a kernel-internal interface to pause perf_event KVM: x86/vPMU: Reuse perf_event to avoid unnecessary pmc_reprogram_counter KVM: x86/vPMU: Add lazy mechanism to release perf_event per vPMC arch/x86/include/asm/kvm_host.h | 17 +++++++ arch/x86/kvm/pmu.c | 88 ++++++++++++++++++++++++++++++++- arch/x86/kvm/pmu.h | 15 +++++- arch/x86/kvm/pmu_amd.c | 14 ++++++ arch/x86/kvm/vmx/pmu_intel.c | 27 ++++++++++ arch/x86/kvm/x86.c | 12 +++++ include/linux/perf_event.h | 10 ++++ kernel/events/core.c | 44 ++++++++++++++--- 8 files changed, 216 insertions(+), 11 deletions(-)
