Messages in this thread | | | From | Yury Norov <> | Subject | [PATCH v2 0/6] lib/group_cpus: rework grp_spread_init_one() and make it O(1) | Date | Thu, 7 Dec 2023 12:38:54 -0800 |
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grp_spread_init_one() implementation is sub-optimal because it traverses bitmaps from the beginning, instead of picking from the previous iteration.
Fix it and use find_bit API where appropriate. While here, optimize cpumasks allocation and drop unneeded cpumask_empty() call.
--- v1: https://lore.kernel.org/all/ZW5MI3rKQueLM0Bz@yury-ThinkPad/T/ v2: add few more optimizations (patches 5-6)
Yury Norov (6): 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() lib/cgroup_cpus.c: don't zero cpumasks in group_cpus_evenly() on allocation lib/group_cpus.c: drop unneeded cpumask_empty() call in __group_cpus_evenly()
include/linux/cpumask.h | 11 ++++++++++ include/linux/find.h | 3 +++ lib/group_cpus.c | 47 +++++++++++++++++++---------------------- 3 files changed, 36 insertions(+), 25 deletions(-)
-- 2.40.1
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