linux-kernel - Re: [PATCH 0/6] {sched_,}find_first{_zero}

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Date:   Fri, 2 Jun 2017 14:34:43 +0300
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Akinobu Mita <mita@...aclelinux.com>,
        Mike Galbraith <efault@....de>, Paul Bolle <pebolle@...cali.nl>
Subject: Re: [PATCH 0/6] {sched_,}find_first{_zero}_bit optimizations

Ping?

On Tue, May 23, 2017 at 09:43:15PM +0300, Yury Norov wrote:
> The series is the result of this discussion: https://lkml.org/lkml/2017/5/12/665
> plus this patch: https://lkml.org/lkml/2017/5/13/137
> (I'd like to have it together with others.)
> 
> Patch 1 remove useless GENERIC_FIND_FIRST_BIT option.  Patches 2 and 3 change
> the order of macros definition and/or headers inclusion for frv and m86k, as
> it's needed in patch 4. Patch 4 adds the optimization for find_first_bit() and
> find_first_zero_bit(). Patches 5 and 6 consolidate the implementation of
> sched_find_first_bit(), and make it local.
> 
> According to previous discussion, I added Arnd's ack to patches 5 and 6.
> https://lkml.org/lkml/2017/5/15/514 and suggested-by to patch 4.
> Arnd, are you OK with it?
> 
> Yury Norov (6):
>   arch: remove GENERIC_FIND_FIRST_BIT
>   m68k: make __ffs and ffz defined prior to including find.h
>   frv: make __ffs() visible for find.h
>   find_first{,_zero}_bit: unroll search cycle for small bitmaps
>   alpha: drop custom implementation for sched_find_first_bit()
>   sched: move sched_find_first_bit() from bitops.h to
>     kernel/sched/sched.h
> 
>  arch/alpha/include/asm/bitops.h    |  18 -----
>  arch/arc/Kconfig                   |   1 -
>  arch/arc/include/asm/bitops.h      |   1 -
>  arch/arm/include/asm/bitops.h      |   1 -
>  arch/arm64/include/asm/bitops.h    |   1 -
>  arch/blackfin/include/asm/bitops.h |   1 -
>  arch/c6x/include/asm/bitops.h      |   1 -
>  arch/cris/include/asm/bitops.h     |   2 -
>  arch/frv/include/asm/bitops.h      |   4 +-
>  arch/h8300/include/asm/bitops.h    |   1 -
>  arch/hexagon/include/asm/bitops.h  |   1 -
>  arch/ia64/include/asm/bitops.h     |   2 -
>  arch/m32r/include/asm/bitops.h     |   1 -
>  arch/m68k/include/asm/bitops.h     | 162 ++++++++++++++++++-------------------
>  arch/metag/include/asm/bitops.h    |   1 -
>  arch/mips/include/asm/bitops.h     |   2 -
>  arch/mn10300/include/asm/bitops.h  |   1 -
>  arch/openrisc/include/asm/bitops.h |   1 -
>  arch/parisc/include/asm/bitops.h   |   1 -
>  arch/powerpc/include/asm/bitops.h  |   2 -
>  arch/s390/Kconfig                  |   1 -
>  arch/s390/include/asm/bitops.h     |   1 -
>  arch/sh/include/asm/bitops.h       |   1 -
>  arch/sparc/include/asm/bitops_32.h |   1 -
>  arch/sparc/include/asm/bitops_64.h |   1 -
>  arch/tile/Kconfig                  |   1 -
>  arch/tile/include/asm/bitops.h     |   1 -
>  arch/unicore32/Kconfig             |   1 -
>  arch/x86/Kconfig                   |   1 -
>  arch/x86/include/asm/bitops.h      |   2 -
>  arch/x86/um/Kconfig                |   1 -
>  arch/xtensa/include/asm/bitops.h   |   1 -
>  include/asm-generic/bitops.h       |   1 -
>  include/asm-generic/bitops/find.h  |  82 +++++++++++++++++--
>  include/asm-generic/bitops/sched.h |  31 -------
>  kernel/sched/sched.h               |  23 ++++++
>  lib/Kconfig                        |   3 -
>  lib/find_bit.c                     |   8 +-
>  38 files changed, 182 insertions(+), 184 deletions(-)
>  delete mode 100644 include/asm-generic/bitops/sched.h
> 
> -- 
> 2.11.0