linux-kernel - Re: [PATCH RFC v1 2/3] perf: Add perf_event

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Message-ID: <CAL_Jsq+wviPPgnFc0vj9j6cKqqnL8HRO8wa8MFeX2fP5J8BcUA@mail.gmail.com>
Date:   Wed, 31 Aug 2022 14:06:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Will Deacon <will@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH RFC v1 2/3] perf: Add perf_event_attr::config3

On Thu, Aug 25, 2022 at 1:08 PM Rob Herring <robh@...nel.org> wrote:
>
> Arm SPEv1.2 adds another 64-bits of event filtering control. As the
> existing perf_event_attr::configN fields are all used up for SPE PMU, an
> additional field is needed. Add a new 'config3' field.

In testing this, just exposing 'config3' in the format attributes
causes the SPE PMU to be disabled. So we can't add this without
breaking existing perf. Shouldn't perf just skip any format fields it
doesn't know about?

Rob