Re: [PATCH] x86: generic versions of find_first_(zero_)bit, convert i386

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From: Stephen Hemminger <shemminger@...>

To: Alexander van Heukelum <heukelum@...>

Cc: <linux-kernel@...>

Subject: Re: [PATCH] x86: generic versions of find_first_(zero_)bit, convert i386

Date: Monday, March 31, 2008 - 1:22 pm

On Mon, 31 Mar 2008 19:15:06 +0200
Alexander van Heukelum <heukelum@mailshack.com> wrote:

quoted text> Generic versions of __find_first_bit and __find_first_zero_bit
> are introduced as simplified versions of __find_next_bit and
> __find_next_zero_bit. Their compilation and use are guarded by
> a new config variable GENERIC_FIND_FIRST_BIT.
> 
> The generic versions of find_first_bit and find_first_zero_bit
> are implemented in terms of the newly introduced __find_first_bit
> and __find_first_zero_bit.
> 
> This patch also converts i386 to the generic functions. The text
> size shrinks slightly due to uninlining of the find_*_bit functions.
> 
>    text    data     bss     dec     hex filename
> 4764939  480324  622592 5867855  59894f vmlinux  (i386 defconfig before)
> 4764645  480324  622592 5867561  598829 vmlinux  (i386 defconfig after)
> 
> Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
> 

Size isn't everything, what is the performance difference?
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Messages in current thread:

[PATCH] x86: generic versions of find_first_(zero_)bit, conv..., Alexander van Heukelum, (Mon Mar 31, 1:15 pm)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Ingo Molnar, (Tue Apr 1, 4:47 am)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Alexander van Heukelum, (Tue Apr 1, 5:46 am)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., dean gaudet, (Sun Apr 6, 1:03 pm)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Alexander van Heukelum, (Sun Apr 6, 2:51 pm)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., dean gaudet, (Sun Apr 6, 4:22 pm)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Alexander van Heukelum, (Mon Apr 7, 6:25 am)

Alternative implementation of the generic __ffs, Alexander van Heukelum, (Fri Apr 18, 4:18 pm)

Re: Alternative implementation of the generic __ffs, dean gaudet, (Fri Apr 18, 7:46 pm)

Re: Alternative implementation of the generic __ffs, Harvey Harrison, (Fri Apr 18, 8:09 pm)

Re: Alternative implementation of the generic __ffs, dean gaudet, (Fri Apr 18, 8:20 pm)

Re: Alternative implementation of the generic __ffs, Joe Perches, (Fri Apr 18, 8:58 pm)

Re: Alternative implementation of the generic __ffs, Harvey Harrison, (Fri Apr 18, 9:04 pm)

Re: Alternative implementation of the generic __ffs, dean gaudet, (Fri Apr 18, 9:11 pm)

Re: Alternative implementation of the generic __ffs, Joe Perches, (Fri Apr 18, 10:55 pm)

Re: Alternative implementation of the generic __ffs, Matti Aarnio, (Sat Apr 19, 6:29 pm)

Re: Alternative implementation of the generic __ffs, Joe Perches, (Sat Apr 19, 11:06 pm)

Re: Alternative implementation of the generic __ffs, Alexander van Heukelum, (Sun Apr 20, 4:42 am)

Re: Alternative implementation of the generic __ffs, Matti Aarnio, (Sun Apr 20, 8:31 am)

Re: Alternative implementation of the generic __ffs, Alexander van Heukelum, (Mon Apr 21, 7:43 am)

Re: Alternative implementation of the generic __ffs, dean gaudet, (Sat Apr 19, 12:13 am)

Re: Alternative implementation of the generic __ffs, Alexander van Heukelum, (Sat Apr 19, 8:10 am)

Re: Alternative implementation of the generic __ffs, Joe Perches, (Sat Apr 19, 2:17 pm)

Re: Alternative implementation of the generic __ffs, Alexander van Heukelum, (Sat Apr 19, 4:26 pm)

Re: Alternative implementation of the generic __ffs, Mikael Pettersson, (Sat Apr 19, 6:05 am)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Ingo Molnar, (Mon Apr 7, 4:43 am)

[PATCH] x86: switch x86_64 to generic find_first_bit, Alexander van Heukelum, (Tue Apr 1, 11:41 am)

[PATCH] x86: optimize find_first_bit for small bitmaps, Alexander van Heukelum, (Tue Apr 1, 11:42 am)

[PATCH] x86: remove x86-specific implementations of find_fir..., Alexander van Heukelum, (Tue Apr 1, 11:47 am)

Re: [PATCH] x86: remove x86-specific implementations of find..., Ingo Molnar, (Fri Apr 4, 4:47 am)

Re: [PATCH] x86: remove x86-specific implementations of find..., Alexander van Heukelum, (Thu Apr 3, 5:34 am)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Stephen Hemminger, (Mon Mar 31, 1:22 pm)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Alexander van Heukelum, (Mon Mar 31, 3:38 pm)

Re: [PATCH] x86: generic versions of find_first_(zero_)bit, ..., Andi Kleen, (Mon Mar 31, 5:58 pm)

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