Messages in this thread Patch in this message |  | | Date | Mon, 26 May 2003 11:55:20 +0200 (CEST) | From | Ingo Molnar <> | Subject | [patch] signal-latency-2.5.69-B0 |
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the attached patch, against BK-curr, further optimizes the 'kick wakeup' scheduler feature:
- do not kick any CPU on UP
- no need to mark the target task for reschedule - it's enough to send an interrupt to that CPU, that will initiate a signal processing pass.
tested on x86 SMP and UP.
Ingo
--- linux/kernel/sched.c.orig +++ linux/kernel/sched.c @@ -500,9 +500,12 @@ repeat_lock_task: resched_task(rq->curr); } success = 1; - } else - if (unlikely(kick) && task_running(rq, p)) - resched_task(rq->curr); + } +#if CONFIG_SMP + else + if (unlikely(kick) && task_running(rq, p) && (p->thread_info->cpu != smp_processor_id())) + smp_send_reschedule(p->thread_info->cpu); +#endif p->state = TASK_RUNNING; } task_rq_unlock(rq, &flags); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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