linux-kernel - Re: [PATCH 0/3] arm64: perf: Make compat tracing better

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Date:   Tue, 25 May 2021 08:04:12 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Seth LaForge <sethml@...gle.com>,
        Ricky Liang <jcliang@...omium.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 0/3] arm64: perf: Make compat tracing better

Catalin / Will,

On Fri, May 7, 2021 at 1:55 PM Douglas Anderson <dianders@...omium.org> wrote:
>
> The goal for this series is to improve "perf" behavior when 32-bit
> userspace code is involved. This turns out to be fairly important for
> Chrome OS which still runs 32-bit userspace for the time being (long
> story there).
>
> I won't repeat everything said in the individual patches since since
> they are wordy enough as it is.
>
> Please enjoy and I hope this isn't too ugly/hacky for inclusion in
> mainline.
>
> Thanks to Nick Desaulniers for his early review of these patches and
> to Ricky for the super early prototype that some of this is based on.
>
>
> Douglas Anderson (3):
>   arm64: perf: perf_callchain_user() compat support for
>     clang/non-APCS-gcc-arm
>   arm64: perf: Improve compat perf_callchain_user() for clang leaf
>     functions
>   arm64: perf: Add a config option saying 32-bit thumb code uses R11 for
>     FP
>
>  arch/arm64/Kconfig                 |  12 ++
>  arch/arm64/kernel/perf_callchain.c | 329 +++++++++++++++++++++++++----
>  2 files changed, 305 insertions(+), 36 deletions(-)

While this isn't massively urgent, I'd like to confirm that this is on
your plate to eventually review and/or land. If it's not, do you have
any suggestions for how I should proceed?

Thanks!

-Doug