sched_ext: Do not enable LLC/NUMA optimizations when domains overlap

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When the LLC and NUMA domains fully overlap, enabling both optimizations
in the built-in idle CPU selection policy is redundant, as it leads to
searching for an idle CPU within the same domain twice.

Likewise, if all online CPUs are within a single LLC domain, LLC
optimization is unnecessary.

Therefore, detect overlapping domains and enable topology optimizations
only when necessary.

Moreover, rely on the online CPUs for this detection logic, instead of
using the possible CPUs.

Fixes: 860a45219b ("sched_ext: Introduce NUMA awareness to the default idle selection policy")
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Andrea Righi 2024-11-08 01:01:36 +01:00 • committed by Tejun Heo

parent 860a45219b

commit f6ce6b9493

1 changed files with 72 additions and 13 deletions

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kernel/sched/ext.c

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