linux-kernel - Re: [PATCH] kbuild: Disable extra debugging info in .s output

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Message-ID: <CAK7LNATW11-DBFZtF0j8S9KsCa1gOGcfAbfNeWm2epkb=1RnGg@mail.gmail.com>
Date:   Fri, 1 Feb 2019 19:51:07 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Subject: Re: [PATCH] kbuild: Disable extra debugging info in .s output

On Fri, Feb 1, 2019 at 7:32 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Fri, Feb 01, 2019 at 07:09:36PM +0900, Masahiro Yamada wrote:
> > I provide the result of "perf stat" of the incremental build for you.
>
> One more question: what exactly is that "incremental build" you're
> measuring with?


I meant "make" after you the full build


> Exact command line please.


$ make defconfig
$ make -j8

 [Wait until the full build finished]

$ perf stat --repeat 20 --null make -j8

 [Wait until the perf result is displayed]




> > Without your patch:
> >
> >
> >  Performance counter stats for 'make -j8' (20 runs):
> >
> >        2.721312445 seconds time elapsed
> >           ( +-  1.02% )
> >
> >
> >
> > With you patch:
> >
> >
> >  Performance counter stats for 'make -j8' (20 runs):
> >
> >        5.038521415 seconds time elapsed
> >           ( +-  0.56% )
>
> This can't be a full kernel build.
>
> Thx.
>
> --
> Regards/Gruss,
>     Boris.
>
> Good mailing practices for 400: avoid top-posting and trim the reply.


--
Best Regards
Masahiro Yamada