The patch titled
sched: consider migration thread with smp nice
has been added to the -mm tree. Its filename is
sched-consider-migration-thread-with-smp-nice.patch
Patches currently in -mm which might be from [EMAIL PROTECTED] are
sched-run-sched_normal-tasks-with-real-time-tasks-on-smt-siblings.patch
sched-implement-nice-support-across-physical-cpus-on-smp.patch
sched-change_prio_bias_only_if_queued.patch
sched-account_rt_tasks_in_prio_bias.patch
sched-smp-nice-bias-busy-queues-on-idle-rebalance.patch
sched-correct_smp_nice_bias.patch
sched-consider-migration-thread-with-smp-nice.patch
From: Con Kolivas <[EMAIL PROTECTED]>
The intermittent scheduling of the migration thread at ultra high priority
makes the smp nice handling see that runqueue as being heavily loaded. The
migration thread itself actually handles the balancing so its influence on
priority balancing should be ignored.
Signed-off-by: Con Kolivas <[EMAIL PROTECTED]>
Cc: Ingo Molnar <[EMAIL PROTECTED]>
Cc: Nick Piggin <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
kernel/sched.c | 35 ++++++++++++++++++++++++++---------
1 files changed, 26 insertions(+), 9 deletions(-)
diff -puN kernel/sched.c~sched-consider-migration-thread-with-smp-nice
kernel/sched.c
--- devel/kernel/sched.c~sched-consider-migration-thread-with-smp-nice
2005-07-06 00:26:09.000000000 -0700
+++ devel-akpm/kernel/sched.c 2005-07-06 00:26:09.000000000 -0700
@@ -668,6 +668,31 @@ static inline void dec_prio_bias(runqueu
{
rq->prio_bias -= MAX_PRIO - prio;
}
+
+static inline void inc_nr_running(task_t *p, runqueue_t *rq)
+{
+ rq->nr_running++;
+ if (rt_task(p)) {
+ if (p != rq->migration_thread)
+ /*
+ * The migration thread does the actual balancing. Do
+ * not bias by its priority as the ultra high priority
+ * will skew balancing adversely.
+ */
+ inc_prio_bias(rq, p->prio);
+ } else
+ inc_prio_bias(rq, p->static_prio);
+}
+
+static inline void dec_nr_running(task_t *p, runqueue_t *rq)
+{
+ rq->nr_running--;
+ if (rt_task(p)) {
+ if (p != rq->migration_thread)
+ dec_prio_bias(rq, p->prio);
+ } else
+ dec_prio_bias(rq, p->static_prio);
+}
#else
static inline void inc_prio_bias(runqueue_t *rq, int prio)
{
@@ -676,25 +701,17 @@ static inline void inc_prio_bias(runqueu
static inline void dec_prio_bias(runqueue_t *rq, int prio)
{
}
-#endif
static inline void inc_nr_running(task_t *p, runqueue_t *rq)
{
rq->nr_running++;
- if (rt_task(p))
- inc_prio_bias(rq, p->prio);
- else
- inc_prio_bias(rq, p->static_prio);
}
static inline void dec_nr_running(task_t *p, runqueue_t *rq)
{
rq->nr_running--;
- if (rt_task(p))
- dec_prio_bias(rq, p->prio);
- else
- dec_prio_bias(rq, p->static_prio);
}
+#endif
/*
* __activate_task - move a task to the runqueue.
_
-
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