[GIT PULL] scheduler fixes

Ingo Molnar
2013-12-19T16:55:38Z

Linus,

Please pull the latest sched-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus

# HEAD: 757dfcaa41844595964f1220f1d33182dae49976 sched/rt: Fix rq's cpupri leak while enqueue/dequeue child RT entities

An RT group-scheduling fix and the sched-domains topology setup fix
from Mel.

Thanks,

Ingo

------------------>
Kirill Tkhai (1):
sched/rt: Fix rq's cpupri leak while enqueue/dequeue child RT entities

Mel Gorman (1):
sched: Assign correct scheduling domain to 'sd_llc'

kernel/sched/core.c | 5 +++--
kernel/sched/rt.c | 14 ++++++++++++++
2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 19af58f..a88f4a4 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4902,6 +4902,7 @@ DEFINE_PER_CPU(struct sched_domain *, sd_asym);
static void update_top_cache_domain(int cpu)
{
struct sched_domain *sd;
+ struct sched_domain *busy_sd = NULL;
int id = cpu;
int size = 1;

@@ -4909,9 +4910,9 @@ static void update_top_cache_domain(int cpu)
if (sd) {
id = cpumask_first(sched_domain_span(sd));
size = cpumask_weight(sched_domain_span(sd));
- sd = sd->parent; /* sd_busy */
+ busy_sd = sd->parent; /* sd_busy */
}
- rcu_assign_pointer(per_cpu(sd_busy, cpu), sd);
+ rcu_assign_pointer(per_cpu(sd_busy, cpu), busy_sd);

rcu_assign_pointer(per_cpu(sd_llc, cpu), sd);
per_cpu(sd_llc_size, cpu) = size;
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 7d57275..1c40655 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -901,6 +901,13 @@ inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
{
struct rq *rq = rq_of_rt_rq(rt_rq);

+#ifdef CONFIG_RT_GROUP_SCHED
+ /*
+ * Change rq's cpupri only if rt_rq is the top queue.
+ */
+ if (&rq->rt != rt_rq)
+ return;
+#endif
if (rq->online && prio < prev_prio)
cpupri_set(&rq->rd->cpupri, rq->cpu, prio);
}
@@ -910,6 +917,13 @@ dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
{
struct rq *rq = rq_of_rt_rq(rt_rq);

+#ifdef CONFIG_RT_GROUP_SCHED
+ /*
+ * Change rq's cpupri only if rt_rq is the top queue.
+ */
+ if (&rq->rt != rt_rq)
+ return;
+#endif
if (rq->online && rt_rq->highest_prio.curr != prev_prio)
cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio.curr);
}