Messages in this thread |  | | | Date | Tue, 13 May 2008 14:02:42 +0200 | | From | Ingo Molnar <> | | Subject | Re: [PATCHv3] Make for_each_cpu_mask a bit smaller | |
* Alexander van Heukelum <heukelum@mailshack.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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