sched: optimize task_tick_rt() a bit

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Mitchell Erblich suggested a quality-of-implementation change to
not requeue SCHED_RR tasks if there's only a single task on the
runqueue, by checking for rq->nr_running == 1.

provide a more efficient implementation of that, to check that
particular RT priority-queue only.

[ From: mingo@elte.hu ]

Also first requeue the task then set need_resched - results in slightly
better machine-instruction ordering. Also clean up the code a bit.

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Dmitry Adamushko 2007-08-24 20:39:10 +02:00 • committed by Ingo Molnar

parent deac4ee65a

commit 98fbc79853

1 changed files with 8 additions and 3 deletions

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kernel/sched_rt.c

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