From: Yury Norov <yury.norov@gmail.com>
To: linux-kernel@vger.kernel.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>,
Andrew Morton <akpm@linux-foundation.org>,
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 v4 00/13] lib/find_bit: fast path for small bitmaps
Date: Mon, 15 Mar 2021 18:54:11 -0700 [thread overview]
Message-ID: <20210316015424.1999082-1-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.
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: - move le.h header together with find.h for m68 and sh;
- preserve small_const_nbits() macro;
- drop FAST_PATH config option as this series doesn't increase .text,
instead, it compacts it;
- add Andy and Rasmus as reviewers of BITMAP API.
Yury Norov (13):
tools: disable -Wno-type-limits
tools: bitmap: sync function declarations with the kernel
arch: rearrange headers inclusion order in asm/bitops for m68k and sh
lib: introduce BITS_{FIRST,LAST} macro
tools: sync BITS_MASK macros with the kernel
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 | 9 ++
include/linux/bitmap.h | 30 +++----
include/linux/bitops.h | 12 ---
include/linux/bits.h | 6 ++
include/linux/cpumask.h | 8 +-
include/linux/netdev_features.h | 2 +-
include/linux/nodemask.h | 2 +-
lib/bitmap.c | 26 +++---
lib/find_bit.c | 72 +++-------------
lib/genalloc.c | 8 +-
tools/include/asm-generic/bitops/find.h | 85 +++++++++++++++++--
tools/include/asm-generic/bitsperlong.h | 3 +
tools/include/linux/bitmap.h | 31 +++----
tools/include/linux/bits.h | 6 ++
tools/lib/bitmap.c | 10 +--
tools/lib/find_bit.c | 56 +++++-------
tools/scripts/Makefile.include | 1 +
tools/testing/radix-tree/bitmap.c | 4 +-
23 files changed, 340 insertions(+), 204 deletions(-)
--
2.25.1
next reply other threads:[~2021-03-16 1:55 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-16 1:54 Yury Norov [this message]
2021-03-16 1:54 ` [PATCH 01/13] tools: disable -Wno-type-limits Yury Norov
2021-03-16 8:17 ` Rasmus Villemoes
2021-03-16 11:39 ` Andy Shevchenko
2021-03-16 1:54 ` [PATCH 02/13] tools: bitmap: sync function declarations with the kernel Yury Norov
2021-03-16 8:18 ` Rasmus Villemoes
2021-03-16 1:54 ` [PATCH 03/13] arch: rearrange headers inclusion order in asm/bitops for m68k and sh Yury Norov
2021-03-16 1:54 ` [PATCH 04/13] lib: introduce BITS_{FIRST,LAST} macro Yury Norov
2021-03-16 8:35 ` Rasmus Villemoes
2021-03-16 11:42 ` Andy Shevchenko
2021-03-17 5:40 ` Yury Norov
2021-03-17 19:58 ` Rasmus Villemoes
2021-03-17 23:33 ` Yury Norov
2021-03-16 1:54 ` [PATCH 05/13] tools: sync BITS_MASK macros with the kernel Yury Norov
2021-03-16 1:54 ` [PATCH 06/13] lib: extend the scope of small_const_nbits() macro Yury Norov
2021-03-16 8:56 ` Rasmus Villemoes
2021-03-17 4:53 ` Yury Norov
2021-03-16 1:54 ` [PATCH 07/13] tools: sync small_const_nbits() macro with the kernel Yury Norov
2021-03-16 1:54 ` [PATCH 08/13] lib: inline _find_next_bit() wrappers Yury Norov
2021-03-16 1:54 ` [PATCH 09/13] tools: sync find_next_bit implementation Yury Norov
2021-03-16 1:54 ` [PATCH 10/13] lib: add fast path for find_next_*_bit() Yury Norov
2021-03-16 1:54 ` [PATCH 11/13] lib: add fast path for find_first_*_bit() and find_last_bit() Yury Norov
2021-04-06 16:03 ` Guenter Roeck
2021-04-06 18:15 ` Yury Norov
2021-03-16 1:54 ` [PATCH 12/13] tools: sync lib/find_bit implementation Yury Norov
2021-03-16 1:54 ` [PATCH 13/13] MAINTAINERS: Add entry for the bitmap API Yury Norov
2021-03-16 11:45 ` Andy Shevchenko
2021-03-17 4:47 ` Yury Norov
2021-03-17 4:57 ` Joe Perches
2021-03-17 6:40 ` Lukas Bulwahn
2021-03-17 19:29 ` Yury Norov
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