sched/fair: Fix pelt lost idle time detection

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The check for some lost idle pelt time should be always done when
pick_next_task_fair() fails to pick a task and not only when we call it
from the fair fast-path.

The case happens when the last running task on rq is a RT or DL task. When
the latter goes to sleep and the /Sum of util_sum of the rq is at the max
value, we don't account the lost of idle time whereas we should.

Fixes: 67692435c4 ("sched: Rework pick_next_task() slow-path")
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

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Vincent Guittot 2025-10-08 15:12:14 +02:00 • committed by Peter Zijlstra

parent ee6e44dfe6

commit 17e3e88ed0

1 changed files with 13 additions and 13 deletions

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kernel/sched/fair.c

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