From: Yury Norov <yury.norov@gmail.com>
To: linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>
Cc: Yury Norov <yury.norov@gmail.com>,
linux-m68k@lists.linux-m68k.org, linux-arch@vger.kernel.org,
linux-sh@vger.kernel.org, Alexey Klimov <aklimov@redhat.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Arnd Bergmann <arnd@arndb.de>, David Sterba <dsterba@suse.com>,
Dennis Zhou <dennis@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Jianpeng Ma <jianpeng.ma@intel.com>,
Joe Perches <joe@perches.com>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Rich Felker <dalias@libc.org>,
Stefano Brivio <sbrivio@redhat.com>,
Wei Yang <richard.weiyang@linux.alibaba.com>,
Wolfram Sang <wsa+renesas@sang-engineering.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>
Subject: [PATCH v6 00/12] lib/find_bit: fast path for small bitmaps
Date: Wed, 31 Mar 2021 17:31:41 -0700 [thread overview]
Message-ID: <20210401003153.97325-1-yury.norov@gmail.com> (raw)
Bitmap operations are much simpler and faster in case of small bitmaps
which fit into a single word. In linux/bitmap.c we have a machinery that
allows compiler to replace actual function call with a few instructions
if bitmaps passed into the function are small and their size is known at
compile time.
find_*_bit() API lacks this functionality; but users will benefit from it
a lot. One important example is cpumask subsystem when
NR_CPUS <= BITS_PER_LONG.
v6 is mostly a resend. The only change comparing to v5 is a fix of
small_const_nbits() synchronization patch.
v1: https://www.spinics.net/lists/kernel/msg3804727.html
v2: https://www.spinics.net/lists/linux-m68k/msg16945.html
v3: https://www.spinics.net/lists/kernel/msg3837020.html
v4: https://patchwork.kernel.org/project/linux-sh/cover/20210316015424.1999082-1-yury.norov@gmail.com/
v5: https://lore.kernel.org/linux-arch/20210321215457.588554-1-yury.norov@gmail.com/T/
v6: - sync small_const_nbits() properly (patch 6).
- Rasmus' ack added.
Yury Norov (12):
tools: disable -Wno-type-limits
tools: bitmap: sync function declarations with the kernel
tools: sync BITMAP_LAST_WORD_MASK() macro with the kernel
arch: rearrange headers inclusion order in asm/bitops for m68k and sh
lib: extend the scope of small_const_nbits() macro
tools: sync small_const_nbits() macro with the kernel
lib: inline _find_next_bit() wrappers
tools: sync find_next_bit implementation
lib: add fast path for find_next_*_bit()
lib: add fast path for find_first_*_bit() and find_last_bit()
tools: sync lib/find_bit implementation
MAINTAINERS: Add entry for the bitmap API
MAINTAINERS | 16 ++++
arch/m68k/include/asm/bitops.h | 6 +-
arch/sh/include/asm/bitops.h | 5 +-
include/asm-generic/bitops/find.h | 108 +++++++++++++++++++++---
include/asm-generic/bitops/le.h | 38 ++++++++-
include/asm-generic/bitsperlong.h | 12 +++
include/linux/bitmap.h | 8 --
include/linux/bitops.h | 12 ---
lib/find_bit.c | 68 ++-------------
tools/include/asm-generic/bitops/find.h | 85 +++++++++++++++++--
tools/include/asm-generic/bitsperlong.h | 3 +
tools/include/linux/bitmap.h | 18 ++--
tools/lib/bitmap.c | 4 +-
tools/lib/find_bit.c | 56 +++++-------
tools/scripts/Makefile.include | 1 +
15 files changed, 284 insertions(+), 156 deletions(-)
--
2.25.1
next reply other threads:[~2021-04-01 0:33 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 0:31 Yury Norov [this message]
2021-04-01 0:31 ` [PATCH 01/12] tools: disable -Wno-type-limits Yury Norov
2021-04-01 0:31 ` [PATCH 02/12] tools: bitmap: sync function declarations with the kernel Yury Norov
2021-04-01 0:31 ` [PATCH 03/12] tools: sync BITMAP_LAST_WORD_MASK() macro " Yury Norov
2021-04-01 0:31 ` [PATCH 04/12] arch: rearrange headers inclusion order in asm/bitops for m68k and sh Yury Norov
2021-04-01 0:31 ` [PATCH 05/12] lib: extend the scope of small_const_nbits() macro Yury Norov
2021-04-01 8:35 ` Andy Shevchenko
2021-04-01 0:31 ` [PATCH 06/12] tools: sync small_const_nbits() macro with the kernel Yury Norov
2021-04-01 0:31 ` [PATCH 07/12] lib: inline _find_next_bit() wrappers Yury Norov
2021-04-01 8:37 ` Andy Shevchenko
2021-04-01 0:31 ` [PATCH 08/12] tools: sync find_next_bit implementation Yury Norov
2021-04-01 0:31 ` [PATCH 09/12] lib: add fast path for find_next_*_bit() Yury Norov
2021-04-01 8:48 ` Andy Shevchenko
2021-04-01 0:31 ` [PATCH 10/12] lib: add fast path for find_first_*_bit() and find_last_bit() Yury Norov
2021-04-01 8:58 ` Andy Shevchenko
2021-04-01 0:31 ` [PATCH 11/12] tools: sync lib/find_bit implementation Yury Norov
2021-05-10 15:27 ` Tetsuo Handa
2021-05-10 15:44 ` Andy Shevchenko
2021-05-10 17:21 ` Yury Norov
2021-05-10 22:51 ` Rikard Falkeborn
2021-05-11 7:28 ` Andy Shevchenko
2021-05-11 10:36 ` Rikard Falkeborn
2021-05-11 11:53 ` Tetsuo Handa
2021-05-11 20:37 ` Rikard Falkeborn
2021-05-12 7:48 ` Arnd Bergmann
2021-05-12 8:15 ` Rasmus Villemoes
2021-05-12 8:33 ` Arnd Bergmann
2021-05-11 12:17 ` Andy Shevchenko
2021-04-01 0:31 ` [PATCH 12/12] MAINTAINERS: Add entry for the bitmap API Yury Norov
2021-04-01 9:14 ` [PATCH v6 00/12] lib/find_bit: fast path for small bitmaps Andy Shevchenko
2021-04-01 9:28 ` Arnd Bergmann
2021-04-01 9:50 ` Andy Shevchenko
2021-04-02 0:32 ` Andrew Morton
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