linux-kernel - Re: [bloat] Measuring header file bloat effects on kernel build performance: a more than 2x slowdown ...

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Message-ID: <20110523170126.GA14407@elte.hu>
Date:	Mon, 23 May 2011 19:01:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [bloat] Measuring header file bloat effects on kernel build
 performance: a more than 2x slowdown ...


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Mon, May 23, 2011 at 2:09 AM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > I've attached a totally hacky patch that removes all the big #include's from
> > kernel/pid.c and includes all structure and API definitions explicitly.
> 
> Hmm.
> 
> A less hacky patch might be to split up "sched.h" into multiple
> smaller things and at least get *part* of the way.
> 

Yeah, absolutely - Peter already raised that a couple of days ago in a sched.h 
discussion so it's on the radar.

The hacky patch was really just a throw-away attempt to see where we stand - we 
only had vague impressions about the level of problems we have, now we know 
some numbers.

> A lot of things want "struct task_struct" (and in some cases thread_info, but 
> that's already split).
> 
> Much fewer care about the signal stuff.
> 
> And many things probably don't even need the task_struct definition, and 
> might be perfectly happy with just function calls rather than having intimate 
> knowledge of the structure layout and an inline function.

Yeah.

Thanks,

	Ingo
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