linux-kernel - Re: [PATCHv3] Make for_each_cpu

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Message-ID: <20080513120242.GD32022@elte.hu>
Date:	Tue, 13 May 2008 14:02:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alexander van Heukelum <heukelum@...lshack.com>
Cc:	Andreas Schwab <schwab@...e.de>, Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Jackson <pj@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Matthew Wilcox <matthew@....cx>,
	ARCH <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander van Heukelum <heukelum@...tmail.fm>
Subject: Re: [PATCHv3] Make for_each_cpu_mask a bit smaller


* Alexander van Heukelum <heukelum@...lshack.com> wrote:

> The for_each_cpu_mask loop is used quite often in the kernel. It makes 
> use of two functions: first_cpu and next_cpu. This patch changes 
> for_each_cpu_mask to use only the latter. Because next_cpu finds the 
> next eligible cpu _after_ the given one, the iteration variable has to 
> be initialized to -1 and next_cpu has to be called with this value 
> before the first iteration. An x86_64 defconfig kernel (from 
> sched/latest) is about 2500 bytes smaller with this patch applied:
> 
>    text	   data	    bss	    dec	    hex	filename
> 6222517	 917952	 749932	7890401	 7865e1	vmlinux.orig
> 6219922	 917952	 749932	7887806	 785bbe	vmlinux
> 
> The same size reduction is seen for defconfig+MAXSMP
> 
>    text	   data	    bss	    dec	    hex	filename
> 6241772	2563968	1492716	10298456	 9d2458	vmlinux.orig
> 6239211	2563968	1492716	10295895	 9d1a57	vmlinux

applied for testing, thanks Alexander.

	Ingo
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