Messages in this thread | | | Date | Mon, 26 Sep 2022 12:17:17 -0700 | From | Yury Norov <> | Subject | Re: [PATCH v3 0/5] lib/find: add find_nth_bit() |
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OK, take in bitmap-for-next.
On Fri, Sep 23, 2022 at 09:18:44AM -0700, Yury Norov wrote: > Ping? > > On Sat, Sep 17, 2022 at 08:07:10PM -0700, Yury Norov wrote: > > Kernel lacks for a function that searches for Nth bit in a bitmap. > > Usually people do it like this: > > for_each_set_bit(bit, mask, size) > > if (n-- == 0) > > return bit; > > > > Which is not so elegant and very slow. > > > > This series adds fast routines for this task, and applies them where > > appropriate. > > > > v1: https://lore.kernel.org/lkml/20220706182300.70862-4-yury.norov@gmail.com/T/ > > v2: https://lore.kernel.org/lkml/CAAH8bW_RYG_Tbpip=BkSFAymDm2y3jJBqTi0PJWA=H-a-L_3tg@mail.gmail.com/T/ > > v3: > > - add bitmap_weight_and() and use it in cpumask_local_spread(); > > - rework find_nth_bit() family: similarly to [1], introduce > > FIND_NTH_BIT(), and optimize the function to return earlier when > > it's known that the rest of bitmap can't meet the requirement. > > - patch "lib/nodemask: inline next_node_in() and node_random()" has > > been merged, so drop it from this series. > > > > On top of: > > [1] https://lore.kernel.org/lkml/20220915020730.852234-1-yury.norov@gmail.com/T/ > > > > Yury Norov (6): > > lib/bitmap: don't call __bitmap_weight() in kernel code > > lib/bitmap: add bitmap_weight_and() > > lib: add find_nth(,and,andnot)_bit() > > lib/bitmap: add tests for find_nth_bit() > > lib/bitmap: remove bitmap_ord_to_pos > > cpumask: add cpumask_nth_{,and,andnot} > > > > fs/ntfs3/bitmap.c | 4 +- > > include/linux/bitmap.h | 13 +++++- > > include/linux/bitops.h | 19 +++++++++ > > include/linux/cpumask.h | 55 +++++++++++++++++++++++++ > > include/linux/find.h | 86 ++++++++++++++++++++++++++++++++++++++++ > > include/linux/nodemask.h | 3 +- > > lib/bitmap.c | 68 ++++++++++++------------------- > > lib/cpumask.c | 28 ++++++------- > > lib/find_bit.c | 44 ++++++++++++++++++++ > > lib/find_bit_benchmark.c | 18 +++++++++ > > lib/test_bitmap.c | 47 +++++++++++++++++++++- > > 11 files changed, 320 insertions(+), 65 deletions(-) > > > > -- > > 2.34.1
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