linux-kernel - Re: [perf] Explicitly use python[3]-[config]

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Message-ID: <CA+icZUV0NRkvbb5Nn86qN_KnXd3qAo9kCqrkPEvf9GHc0SAt3w@mail.gmail.com>
Date:   Fri, 31 Jul 2020 12:42:17 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [perf] Explicitly use python[3]-[config]

> Please let me know if you need further help.
>
> - Arnaldo

Hi Arnaldo,

YES, I need further help.

I have published in [1] numbers for "perf stat make ..." with
GNU/gcc+binutils vs. LLVM toolchain for building Linux v5.8-rc7.

[ GNU/gcc+binutils toolchain ]

   10964.876434769 seconds time elapsed

   29666.464675000 seconds user
    2149.943729000 seconds sys

[ LLVM toolchain ]

   17149.393417675 seconds time elapsed

   47787.158036000 seconds user
    2289.196142000 seconds sys

How can I dig further to see why the time for user is higher when
building with LLVM toolchain?
Any suggestions?

Thanks.

Regards,
- Sedat -

[1] https://github.com/ClangBuiltLinux/linux/issues/1086#issuecomment-667036028