sched: Separate group-scheduling code more clearly
Clean up cfs/rt runqueue initialization by moving group scheduling
related code into the corresponding functions.
Also, keep group scheduling as an add-on, so that things are only done
additionally, i. e. remove the init_*_rq() calls from init_tg_*_entry().
(This removes a redundant initalization during sched_init()).
In case of group scheduling rt_rq->highest_prio.curr is now initialized
twice, but adding another #ifdef seems not worth it.
Signed-off-by: Jan H. Schönherr <schnhrr@cs.tu-berlin.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1310661163-16606-1-git-send-email-schnhrr@cs.tu-berlin.de
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index e3f0bac..6fdf7ff 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7859,17 +7859,10 @@
&& addr < (unsigned long)__sched_text_end);
}
-static void init_cfs_rq(struct cfs_rq *cfs_rq, struct rq *rq)
+static void init_cfs_rq(struct cfs_rq *cfs_rq)
{
cfs_rq->tasks_timeline = RB_ROOT;
INIT_LIST_HEAD(&cfs_rq->tasks);
-#ifdef CONFIG_FAIR_GROUP_SCHED
- cfs_rq->rq = rq;
- /* allow initial update_cfs_load() to truncate */
-#ifdef CONFIG_SMP
- cfs_rq->load_stamp = 1;
-#endif
-#endif
cfs_rq->min_vruntime = (u64)(-(1LL << 20));
#ifndef CONFIG_64BIT
cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
@@ -7889,13 +7882,9 @@
/* delimiter for bitsearch: */
__set_bit(MAX_RT_PRIO, array->bitmap);
-#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
+#if defined CONFIG_SMP
rt_rq->highest_prio.curr = MAX_RT_PRIO;
-#ifdef CONFIG_SMP
rt_rq->highest_prio.next = MAX_RT_PRIO;
-#endif
-#endif
-#ifdef CONFIG_SMP
rt_rq->rt_nr_migratory = 0;
rt_rq->overloaded = 0;
plist_head_init_raw(&rt_rq->pushable_tasks, &rq->lock);
@@ -7905,11 +7894,6 @@
rt_rq->rt_throttled = 0;
rt_rq->rt_runtime = 0;
raw_spin_lock_init(&rt_rq->rt_runtime_lock);
-
-#ifdef CONFIG_RT_GROUP_SCHED
- rt_rq->rt_nr_boosted = 0;
- rt_rq->rq = rq;
-#endif
}
#ifdef CONFIG_FAIR_GROUP_SCHED
@@ -7918,11 +7902,17 @@
struct sched_entity *parent)
{
struct rq *rq = cpu_rq(cpu);
- tg->cfs_rq[cpu] = cfs_rq;
- init_cfs_rq(cfs_rq, rq);
- cfs_rq->tg = tg;
+ cfs_rq->tg = tg;
+ cfs_rq->rq = rq;
+#ifdef CONFIG_SMP
+ /* allow initial update_cfs_load() to truncate */
+ cfs_rq->load_stamp = 1;
+#endif
+
+ tg->cfs_rq[cpu] = cfs_rq;
tg->se[cpu] = se;
+
/* se could be NULL for root_task_group */
if (!se)
return;
@@ -7945,12 +7935,14 @@
{
struct rq *rq = cpu_rq(cpu);
- tg->rt_rq[cpu] = rt_rq;
- init_rt_rq(rt_rq, rq);
+ rt_rq->highest_prio.curr = MAX_RT_PRIO;
+ rt_rq->rt_nr_boosted = 0;
+ rt_rq->rq = rq;
rt_rq->tg = tg;
- rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
+ tg->rt_rq[cpu] = rt_rq;
tg->rt_se[cpu] = rt_se;
+
if (!rt_se)
return;
@@ -8032,7 +8024,7 @@
rq->nr_running = 0;
rq->calc_load_active = 0;
rq->calc_load_update = jiffies + LOAD_FREQ;
- init_cfs_rq(&rq->cfs, rq);
+ init_cfs_rq(&rq->cfs);
init_rt_rq(&rq->rt, rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
root_task_group.shares = root_task_group_load;
@@ -8335,6 +8327,7 @@
if (!se)
goto err_free_rq;
+ init_cfs_rq(cfs_rq);
init_tg_cfs_entry(tg, cfs_rq, se, i, parent->se[i]);
}
@@ -8425,6 +8418,8 @@
if (!rt_se)
goto err_free_rq;
+ init_rt_rq(rt_rq, cpu_rq(i));
+ rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
init_tg_rt_entry(tg, rt_rq, rt_se, i, parent->rt_se[i]);
}
