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Message-ID: <e567902b-4ae6-c880-2ed3-9c9170496cbd@linux.intel.com>
Date: Mon, 21 Oct 2019 10:26:01 +0800
From: Like Xu <like.xu@...ux.intel.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, peterz@...radead.org,
Jim Mattson <jmattson@...gle.com>, rkrcmar@...hat.com,
sean.j.christopherson@...el.com, vkuznets@...hat.com,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
ak@...ux.intel.com, wei.w.wang@...el.com, kan.liang@...el.com,
like.xu@...el.com, ehankland@...gle.com, arbel.moshe@...cle.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] KVM: x86/vPMU: Efficiency optimization by reusing
last created perf_event
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/20190930072257.43352-1-like.xu@linux.intel.com/
>
> 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(-)
>
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