sched_ext: Introduce LLC awareness to the default idle selection policy

Browse source

Rely on the scheduler topology information to implement basic LLC
awareness in the sched_ext build-in idle selection policy.

This allows schedulers using the built-in policy to make more informed
decisions when selecting an idle CPU in systems with multiple LLCs, such
as NUMA systems or chiplet-based architectures, and it helps keep tasks
within the same LLC domain, thereby improving cache locality.

For efficiency, LLC awareness is applied only to tasks that can run on
all the CPUs in the system for now. If a task's affinity is modified
from user space, it's the responsibility of user space to choose the
appropriate optimized scheduling domain.

Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

...

This commit is contained in:

Andrea Righi 2024-10-23 01:47:18 +02:00 • committed by Tejun Heo

parent b452ae4d20

commit dfa4ed29b1

1 changed files with 60 additions and 0 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

60

kernel/sched/ext.c

View file