linux-kernel - [PATCH 0/3] Use static_call for kvm_pmu

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Date:   Wed,  3 Nov 2021 15:03:07 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] Use static_call for kvm_pmu_ops

Hi,

This is a successor to a previous patch set from Jason Baron. Let's convert
kvm_pmu_ops to use static_call. Shows good performance gains for
a typical perf use case [2] in the guest (results in patch 3/3).

[1] https://lore.kernel.org/lkml/cover.1610680941.git.jbaron@akamai.com/
[2] perf record -e branch-instructions -e branch-misses \
-e cache-misses -e cache-references -e cpu-cycles \
-e instructions ./workload

Thanks,

Like Xu (3):
  KVM: x86: Copy kvm_pmu_ops by value to eliminate layer of indirection
  KVM: x86: Introduce definitions to support static calls for
    kvm_pmu_ops
  KVM: x86: Use static calls to reduce kvm_pmu_ops overhead

 arch/x86/include/asm/kvm-x86-pmu-ops.h | 32 ++++++++++++++++++
 arch/x86/kvm/pmu.c                     | 46 +++++++++++++++-----------
 arch/x86/kvm/pmu.h                     | 19 ++++++++++-
 arch/x86/kvm/vmx/nested.c              |  2 +-
 arch/x86/kvm/x86.c                     |  5 +++
 5 files changed, 83 insertions(+), 21 deletions(-)
 create mode 100644 arch/x86/include/asm/kvm-x86-pmu-ops.h

-- 
2.33.0