linux-kernel - Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to extend the kernel

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Message-ID: <20190219042843.x4rf526x4x6dprli@ast-mbp.dhcp.thefacebook.com>
Date:   Mon, 18 Feb 2019 20:28:44 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        atish patra <atishp04@...il.com>,
        Daniel Colascione <dancol@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Karim Yaghmour <karim.yaghmour@...rsys.com>,
        Kees Cook <keescook@...omium.org>, kernel-team@...roid.com,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Manoj Rao <linux@...ojrajarao.com>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yonghong Song <yhs@...com>
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.