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Date:   Mon, 18 Feb 2019 20:28:44 -0800
From:   Alexei Starovoitov <>
To:     Masahiro Yamada <>
Cc:     "Joel Fernandes (Google)" <>,
        Networking <>,
        Linux Kernel Mailing List <>,
        Andrew Morton <>,
        Alexei Starovoitov <>,
        atish patra <>,
        Daniel Colascione <>,
        Dan Williams <>,
        Greg Kroah-Hartman <>,
        Jonathan Corbet <>,
        Karim Yaghmour <>,
        Kees Cook <>,,
        "open list:DOCUMENTATION" <>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        Manoj Rao <>,
        Paul McKenney <>,
        "Peter Zijlstra (Intel)" <>,
        Randy Dunlap <>,
        Steven Rostedt <>,
        Shuah Khan <>,
        Thomas Gleixner <>,
        Yonghong Song <>
Subject: Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to
 extend the kernel

On Tue, Feb 19, 2019 at 01:14:11PM +0900, Masahiro Yamada wrote:
> I was able to compile it in-tree
> but it makes the incremental build extremely slow.
> (Here, the incremental build means
> "make" without changing any code after the full build.)
> Before this patch, "make -j8" took 11 sec on my machine.
> After this patch, x86_64_defconfig + CONFIG_IKHEADERS_PROC=y
> takes 53 sec for me since kernel/kheaders_data.txz is regenerated
> every time even when you did not touch any source file.
> We should take time for careful review and test.
> Please give me more time for thorough review.

Thanks for taking a look. All are very valid points.
Incremental build is must have.

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