[v1] lib/group_cpus: rework grp_spread_init_one() and make it O(1)

[PATCH 0/4] lib/group_cpus: rework grp_spread_init_one() and make it O(1)

Yury Norov posted 4 patches 2 years, 1 month ago

Diff against v1 v2 v3 v4 v5
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include/linux/cpumask.h | 11 +++++++++++
include/linux/find.h    |  3 +++
lib/group_cpus.c        | 29 ++++++++++++-----------------
3 files changed, 26 insertions(+), 17 deletions(-)

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[PATCH 0/4] lib/group_cpus: rework grp_spread_init_one() and make it O(1)

Posted by Yury Norov 2 years, 1 month ago

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

Re: [PATCH 0/4] lib/group_cpus: rework grp_spread_init_one() and make it O(1)

Posted by Yury Norov 2 years ago

Ping?

On Wed, Nov 01, 2023 at 03:58:16PM -0700, Yury Norov wrote:
> 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