lkml.org 
[lkml]   [2023]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/6] lib/group_cpus: rework grp_spread_init_one() and make it O(1)
Date
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

\
 
 \ /
  Last update: 2023-12-07 21:39    [W:0.125 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site