Messages in this thread Patch in this message | | | Date | Mon, 17 Feb 2003 03:12:56 -0500 (EST) | From | Zwane Mwaikambo <> | Subject | [PATCH][2.5] Don't wake up tasks on offline processors |
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This patch stops waking up of tasks onto offline processors. We need this when migrating tasks from offline processors onto other online ones and to avert a livelock whilst doing so.
Index: linux-2.5.61-trojan/kernel/sched.c =================================================================== RCS file: /build/cvsroot/linux-2.5.61/kernel/sched.c,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 sched.c --- linux-2.5.61-trojan/kernel/sched.c 15 Feb 2003 12:32:44 -0000 1.1.1.1 +++ linux-2.5.61-trojan/kernel/sched.c 15 Feb 2003 16:04:51 -0000 @@ -465,7 +473,8 @@ * Fast-migrate the task if it's not running or runnable * currently. Do not violate hard affinity. */ - if (unlikely(sync && !task_running(rq, p) && + if (likely(cpu_online(smp_processor_id())) && + unlikely(sync && !task_running(rq, p) && (task_cpu(p) != smp_processor_id()) && (p->cpus_allowed & (1UL << smp_processor_id())))) { - 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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