linux-kernel - Re: [PATCH v2 0/6] kbuild: optimize output directory creation

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Message-ID: <CAK7LNASTaSum7Lk70fFmfGFmonycizo7FBv9H=j1URttCo6LvA@mail.gmail.com>
Date:   Thu, 16 Nov 2017 09:10:16 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <mmarek@...e.com>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2 0/6] kbuild: optimize output directory creation

2017-11-13 19:29 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
>
> I looked into the build scripts, focusing on "mkdir" optimization.
>
> With this series, I succeeded in speeding up the incremental build
> with O= option.
>
> The following is the result of "time make O=foo",
> where "foo" is the output directory that has already been built.
>
> Before:
>
> real    0m8.322s
> user    0m4.324s
> sys     0m1.220s
>
> After:
>
> real    0m6.989s
> user    0m4.168s
> sys     0m1.080s
>
> 4/6 gave the biggest impact.
>
>


Series, applied to linux-kbuild/kbuild.

-- 
Best Regards
Masahiro Yamada