linux-kernel - [PATCH 0/4] lib/group_cpus: rework grp_spread_init

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Date:   Wed,  1 Nov 2023 15:58:16 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Cc:     Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH 0/4] lib/group_cpus: rework grp_spread_init_one() and make it O(1)

grp_spread_init_one() implementation is sub-optimal now because it
traverses bitmaps from the beginning, instead of picking from the
previous iteration.

Fix it and use find_bit API where appropriate.

Yury Norov (4):
  cpumask: introduce for_each_cpu_and_from()
  lib/group_cpus: relax atomicity requirement in grp_spread_init_one()
  lib/group_cpus: optimize inner loop in grp_spread_init_one()
  lib/group_cpus: optimize outer loop in grp_spread_init_one()

 include/linux/cpumask.h | 11 +++++++++++
 include/linux/find.h    |  3 +++
 lib/group_cpus.c        | 29 ++++++++++++-----------------
 3 files changed, 26 insertions(+), 17 deletions(-)

-- 
2.39.2