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Red Hat Bugzilla – Attachment 217181 Details for
Bug 319911
2.6.9 and interactive task starvation
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[patch]
Mikes's patch to avoid expired starvation
avoid-interactive-starvation.patch (text/plain), 2.04 KB, created by
Bryn M. Reeves
on 2007-10-05 09:39:51 UTC
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Description:
Mikes's patch to avoid expired starvation
Filename:
MIME Type:
Creator:
Bryn M. Reeves
Created:
2007-10-05 09:39:51 UTC
Size:
2.04 KB
patch
obsolete
>--- kernel/sched.c.org 2006-03-17 14:48:35.000000000 +0100 >+++ kernel/sched.c 2006-03-17 17:41:25.000000000 +0100 >@@ -662,11 +662,30 @@ > } > > /* >+ * We place interactive tasks back into the active array, if possible. >+ * >+ * To guarantee that this does not starve expired tasks we ignore the >+ * interactivity of a task if the first expired task had to wait more >+ * than a 'reasonable' amount of time. This deadline timeout is >+ * load-dependent, as the frequency of array switched decreases with >+ * increasing number of running tasks. We also ignore the interactivity >+ * if a better static_prio task has expired: >+ */ >+#define EXPIRED_STARVING(rq) \ >+ ((STARVATION_LIMIT && ((rq)->expired_timestamp && \ >+ (jiffies - (rq)->expired_timestamp >= \ >+ STARVATION_LIMIT * ((rq)->nr_running) + 1))) || \ >+ ((rq)->curr->static_prio > (rq)->best_expired_prio)) >+ >+/* > * __activate_task - move a task to the runqueue. > */ > static inline void __activate_task(task_t *p, runqueue_t *rq) > { >- enqueue_task(p, rq->active); >+ prio_array_t *array = rq->active; >+ if (unlikely(EXPIRED_STARVING(rq))) >+ array = rq->expired; >+ enqueue_task(p, array); > rq->nr_running++; > } > >@@ -2461,22 +2480,6 @@ > } > > /* >- * We place interactive tasks back into the active array, if possible. >- * >- * To guarantee that this does not starve expired tasks we ignore the >- * interactivity of a task if the first expired task had to wait more >- * than a 'reasonable' amount of time. This deadline timeout is >- * load-dependent, as the frequency of array switched decreases with >- * increasing number of running tasks. We also ignore the interactivity >- * if a better static_prio task has expired: >- */ >-#define EXPIRED_STARVING(rq) \ >- ((STARVATION_LIMIT && ((rq)->expired_timestamp && \ >- (jiffies - (rq)->expired_timestamp >= \ >- STARVATION_LIMIT * ((rq)->nr_running) + 1))) || \ >- ((rq)->curr->static_prio > (rq)->best_expired_prio)) >- >-/* > * Account user cpu time to a process. > * @p: the process that the cpu time gets accounted to > * @hardirq_offset: the offset to subtract from hardirq_count() >
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