sched_ext: Implement auto local dispatching of migration disabled tasks

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Migration disabled tasks are special and pinned to their previous CPUs. They
tripped up some unsuspecting BPF schedulers as their ->nr_cpus_allowed may
not agree with the bits set in ->cpus_ptr. Make it easier for BPF schedulers
by automatically dispatching them to the pinned local DSQs by default. If a
BPF scheduler wants to handle migration disabled tasks explicitly, it can
set SCX_OPS_ENQ_MIGRATION_DISABLED.

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

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Tejun Heo 2025-02-07 10:58:23 -10:00

parent 029b6ce733

commit 2fa0fbeb69

1 changed files with 23 additions and 0 deletions

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kernel/sched/ext.c

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