linux-kernel - Re: [PATCH V2 16/25] perf/x86: Register hybrid PMUs

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Message-ID: <20210311175358.GF203350@tassilo.jf.intel.com>
Date:   Thu, 11 Mar 2021 09:53:58 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kan.liang@...ux.intel.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, acme@...nel.org, tglx@...utronix.de,
        bp@...en8.de, namhyung@...nel.org, jolsa@...hat.com,
        yao.jin@...ux.intel.com, alexander.shishkin@...ux.intel.com,
        adrian.hunter@...el.com
Subject: Re: [PATCH V2 16/25] perf/x86: Register hybrid PMUs

> AFAICT we could register them all here. That instantly fixes that
> CPU_STARTING / CPU_DEAD fail elsewhere in this patch.

This would mean a system that only has Atoms or only has big cores
would still show the other CPU's PMU. We expect those to exist.

-Andi