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From:   Vince Weaver <vincent.weaver@maine.edu>
Date:   Tue, 4 Jul 2023 08:28:08 -0400 (EDT)
To:     Alexandre Ghiti <alexghiti@rivosinc.com>
cc:     Jonathan Corbet <corbet@lwn.net>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Ian Rogers <irogers@google.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Atish Patra <atishp@atishpatra.org>,
        Anup Patel <anup@brainfault.org>,
        Will Deacon <will@kernel.org>, Rob Herring <robh@kernel.org>,
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        linux-perf-users@vger.kernel.org, linux-riscv@lists.infradead.org,
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Subject: Re: [PATCH v4 08/10] Documentation: admin-guide: Add riscv
 sysctl_perf_user_access
In-Reply-To: <20230703124647.215952-9-alexghiti@rivosinc.com>
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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