linux-kernel - Re: [PATCH v4 08/10] Documentation: admin-guide: Add riscv sysctl_perf_user

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Date:   Tue, 4 Jul 2023 08:28:08 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
cc:     Jonathan Corbet <corbet@....net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atishp@...shpatra.org>,
        Anup Patel <anup@...infault.org>,
        Will Deacon <will@...nel.org>, Rob Herring <robh@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 08/10] Documentation: admin-guide: Add riscv
 sysctl_perf_user_access



On Mon, 3 Jul 2023, Alexandre Ghiti wrote:

> -=================================
> +perf_user_access (arm64 and riscv only)
> +=======================================

so I complained about this when support for this went in for arm64.

Why do we have two separate ways of getting this info, one for x86 and one 
for arm64/riscv?

Could we get x86 patched to use the same interface?

It's a pain for tool users to have to maintain multiple code paths because 
the various architectures can't agree on how to export this info to 
userspace.

Vince