linux-kernel - Re: [PATCH v2 1/6] KVM: x86/pmu: Setup pmc->eventsel for fixed PMCs

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Message-ID: <0815b30f-c0e5-4261-df03-bd82d69b05c7@gmail.com>
Date:   Fri, 10 Dec 2021 18:20:36 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Like Xu <likexu@...cent.com>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 1/6] KVM: x86/pmu: Setup pmc->eventsel for fixed PMCs

On 10/12/2021 2:49 am, Paolo Bonzini wrote:
> 
> or we modify find_fixed_event and its caller to support PERF_TYPE_RAW
> counters, and then add support for the IceLake TOPDOWN.SLOTS fixed
> counter.

It looks like the TOPDOWN approach from "Yasin Ahmad"
has recently been widely advertised among developers.

But I still need bandwidth to clean up some perf driver stuff
in order to enable topdown counter smoothly in the guest.

cc linux-perf-users@...r.kernel.org for user voices.

> 
> What's your preference?
> 
> Paolo