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Date:   Sun, 22 Nov 2020 15:35:44 +0000
From:   Pavel Begunkov <>
To:     Jens Axboe <>,,
        Omar Sandoval <>
Subject: [PATCH v2 for-next 0/4] optimise sbitmap deferred clear

sbitmap takes away some cycles for my tag-deficient test, removal of
locking in sbitmap_deferred_clear() gives +~1% throuhput.

[1/4] and [4/4] are simple, it'd be great if someone could double
check for ordering issues for other two patches.

v2: add 3rd (CAS -> atomic and) and 4th patches

Pavel Begunkov (4):
  sbitmap: optimise sbitmap_deferred_clear()
  sbitmap: remove swap_lock
  sbitmap: replace CAS with atomic and
  sbitmap: simplify wrap check

 include/linux/sbitmap.h |  5 -----
 lib/sbitmap.c           | 44 +++++++++++++++++------------------------
 2 files changed, 18 insertions(+), 31 deletions(-)


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