linux-kernel - Re: [PATCH v2 1/7] perf/x86/core: Update x86_pmu.pebs_capable for ICELAKE

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Message-ID: <YvpGxaSRK3T5SOQB@worktop.programming.kicks-ass.net>
Date:   Mon, 15 Aug 2022 15:14:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Like Xu <like.xu.linux@...il.com>
Cc:     Kan Liang <kan.liang@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 1/7] perf/x86/core: Update x86_pmu.pebs_capable for
 ICELAKE_{X,D}

On Mon, Aug 15, 2022 at 08:48:36PM +0800, Like Xu wrote:

> In the SDM world, we actually have three PEBS sub-features:
> 
> [July 2017] 18.5.4.1 Extended PEBS (first on Goldmont Plus)
> [January 2019] 18.9.2 Adaptive PEBS (first on Tremont)
> [April 2021] IA32_PERF_CAPABILITIES.PEBS_BASELINE in the Table 2-2. IA-32
> Architectural MSRs
> 
> Waiting Kan to confirm the real world.

Right, so it's possible GLM would need the FMS thing, but AFAIK ICX
has Baseline and therefore shouldn't need it.