cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq()

Browse source

select_fallback_rq() only needs to recheck for an allowed CPU if the
affinity mask of the task has changed since the last check.

Return a 'bool' from cpuset_cpus_allowed_fallback() to indicate whether
the affinity mask was updated, and use this to elide the allowed check
when the mask has been left alone.

No functional change.

Suggested-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lore.kernel.org/r/20210730112443.23245-5-will@kernel.org

...

This commit is contained in:

Will Deacon 2021-07-30 12:24:31 +01:00 • committed by Peter Zijlstra

parent 431c69fac0

commit 97c0054dbe

3 changed files with 12 additions and 6 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

5

include/linux/cpuset.h

View file

10

kernel/cgroup/cpuset.c

View file

3

kernel/sched/core.c

View file