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Date: Thu, 15 Dec 2022 21:11:32 +0800 From: Like Xu <like.xu.linux@...il.com> To: Marc Zyngier <maz@...nel.org> Cc: Peter Zijlstra <peterz@...radead.org>, Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, Fenghua Yu <fenghua.yu@...el.com>, kvmarm@...ts.linux.dev, linux-perf-users@...r.kernel.org Subject: Re: [PATCH RFC 1/8] perf/core: Add *group_leader to perf_event_create_kernel_counter() On 12/12/2022 9:23 pm, Marc Zyngier wrote: > On Mon, 12 Dec 2022 12:58:37 +0000, > Like Xu <like.xu.linux@...il.com> wrote: >> >> From: Like Xu <likexu@...cent.com> >> >> Like syscalls users, kernel-space perf_event creators may also use group >> counters abstraction to gain pmu functionalities, and an in-kernel counter >> groups behave much like normal 'single' counters, following the group >> semantics-based behavior. >> >> No functional changes at this time. An example will be that KVM creates >> Intel slot event as group leader and other topdown metric events to emulate >> MSR_PERF_METRICS pmu capability for guests. >> >> Cc: Peter Zijlstra <peterz@...radead.org> >> Cc: Marc Zyngier <maz@...nel.org> >> Cc: Fenghua Yu <fenghua.yu@...el.com> >> Cc: kvmarm@...ts.linux.dev >> Cc: linux-perf-users@...r.kernel.org >> Signed-off-by: Like Xu <likexu@...cent.com> >> --- >> arch/arm64/kvm/pmu-emul.c | 4 ++-- >> arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 4 ++-- >> arch/x86/kvm/pmu.c | 2 +- >> arch/x86/kvm/vmx/pmu_intel.c | 2 +- >> include/linux/perf_event.h | 1 + >> kernel/events/core.c | 4 +++- >> kernel/events/hw_breakpoint.c | 4 ++-- >> kernel/events/hw_breakpoint_test.c | 2 +- >> kernel/watchdog_hld.c | 2 +- >> 9 files changed, 14 insertions(+), 11 deletions(-) >> >> diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c >> index 24908400e190..11c3386bc86b 100644 >> --- a/arch/arm64/kvm/pmu-emul.c >> +++ b/arch/arm64/kvm/pmu-emul.c >> @@ -624,7 +624,7 @@ static void kvm_pmu_create_perf_event(struct kvm_pmc *pmc) >> >> attr.sample_period = compute_period(pmc, kvm_pmu_get_pmc_value(pmc)); >> >> - event = perf_event_create_kernel_counter(&attr, -1, current, >> + event = perf_event_create_kernel_counter(&attr, -1, current, NULL, >> kvm_pmu_perf_overflow, pmc); > > Wouldn't it be better to have a separate helper that takes the group leader > as a parameter, and reimplement perf_event_create_kernel_counter() in term > of this helper? > > M. > Applied. It makes changes more concise, thank you.
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