sched_ext: Make watchdog sub-sched aware

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Currently, the watchdog checks all tasks as if they are all on scx_root.
Move scx_watchdog_timeout inside scx_sched and make check_rq_for_timeouts()
use the timeout from the scx_sched associated with each task.
refresh_watchdog() is added, which determines the timer interval as half of
the shortest watchdog timeouts of all scheds and arms or disarms it as
necessary. Every scx_sched instance has equivalent or better detection
latency while sharing the same timer.

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

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Tejun Heo 2026-03-06 07:58:04 -10:00

parent 34ecfb3551

commit cde94c032b

2 changed files with 56 additions and 25 deletions

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74

kernel/sched/ext.c

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7

kernel/sched/ext_internal.h

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