linux-kernel - Re: [PATCH/RFC] headers: drop 2 #included headers from <linux/interrupt.h>

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Date:   Mon, 26 Feb 2018 08:59:31 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH/RFC] headers: drop 2 #included headers from
 <linux/interrupt.h>


* Rasmus Villemoes <linux@...musvillemoes.dk> wrote:

> [...] Now I finally got around to writing some scripts for that, so here's a 
> visualization of (the evolution of) the problem:
> 
> https://wildmoose.dk/header-bloat/

Nice! In particular your final conclusion is impressive and scary:

> So the typical (median) translation unit ends up including over 450 headers 
> files, making the whole TU about 200 times bigger than the .c file itself, while 
> more than 25% of the translation units get bloated to over 400 times the size of 
> the .c file.

Even with a lot of this being eliminated at fairly early compiling stages that's a 
*huge* chunk of code that needs to be parsed again and again and again and again 
...

> I hope to find some time soonish to polish the old programs and see if they 
> actually still work.

That would be lovely!

Thanks,

	Ingo