sched_ext: Initialize idle masks as busy

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The built-in idle masks are reset with all online CPUs marked idle
before sched_ext is enabled. Busy CPUs can therefore be incorrectly
advertised as idle until their next idle transition.

Initialize the masks empty so that the initial state is conservative.
When bypass is lifted, every CPU is rescheduled and idle-to-idle
re-picks populate the masks with CPUs that are actually idle. Later
idle transitions keep the masks up to date.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Reviewed-by: Kuba Piecuch <jpiecuch@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Andrea Righi 2026-08-03 08:08:12 +02:00 • committed by Tejun Heo

parent c5b9316cf3

commit ba190ed3f4

1 changed files with 8 additions and 8 deletions

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kernel/sched/ext/idle.c

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