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Subject[GIT pull] scheduler updates for 4.17
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

A few scheduler fixes:

- Prevent a bogus warning vs. runqueue clock update flags in
do_sched_rt_period_timer()

- Simplify the helper functions which handle requests for skipping the
runqueue clock updat.

- Do not unlock the tunables mutex in the error path of the cpu frequency
scheduler utils. Its not held.

- Enforce proper alignement for 'struct util_est' in sched_avg to prevent
a misalignment fault on IA64

Thanks,

tglx

------------------>
Davidlohr Bueso (2):
sched/rt: Fix rq->clock_update_flags < RQCF_ACT_SKIP warning
sched/core: Simplify helpers for rq clock update skip requests

Jules Maselbas (1):
sched/cpufreq/schedutil: Fix error path mutex unlock

Peter Zijlstra (1):
sched/core: Force proper alignment of 'struct util_est'


include/linux/sched.h | 6 +++---
kernel/sched/core.c | 2 +-
kernel/sched/cpufreq_schedutil.c | 3 +--
kernel/sched/deadline.c | 2 +-
kernel/sched/fair.c | 2 +-
kernel/sched/rt.c | 4 +++-
kernel/sched/sched.h | 17 ++++++++++++-----
7 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f228c6033832..b3d697f3b573 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -300,7 +300,7 @@ struct util_est {
unsigned int enqueued;
unsigned int ewma;
#define UTIL_EST_WEIGHT_SHIFT 2
-};
+} __attribute__((__aligned__(sizeof(u64))));

/*
* The load_avg/util_avg accumulates an infinite geometric series
@@ -364,7 +364,7 @@ struct sched_avg {
unsigned long runnable_load_avg;
unsigned long util_avg;
struct util_est util_est;
-};
+} ____cacheline_aligned;

struct sched_statistics {
#ifdef CONFIG_SCHEDSTATS
@@ -435,7 +435,7 @@ struct sched_entity {
* Put into separate cache line so it does not
* collide with read-mostly values above.
*/
- struct sched_avg avg ____cacheline_aligned_in_smp;
+ struct sched_avg avg;
#endif
};

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 28b68995a417..550a07f648b6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -874,7 +874,7 @@ void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags)
* this case, we can save a useless back to back clock update.
*/
if (task_on_rq_queued(rq->curr) && test_tsk_need_resched(rq->curr))
- rq_clock_skip_update(rq, true);
+ rq_clock_skip_update(rq);
}

#ifdef CONFIG_SMP
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 2b124811947d..d2c6083304b4 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -631,10 +631,9 @@ static int sugov_init(struct cpufreq_policy *policy)

stop_kthread:
sugov_kthread_stop(sg_policy);
-
-free_sg_policy:
mutex_unlock(&global_tunables_lock);

+free_sg_policy:
sugov_policy_free(sg_policy);

disable_fast_switch:
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index d1c7bf7c7e5b..e7b3008b85bb 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1560,7 +1560,7 @@ static void yield_task_dl(struct rq *rq)
* so we don't do microscopic update in schedule()
* and double the fastpath cost.
*/
- rq_clock_skip_update(rq, true);
+ rq_clock_skip_update(rq);
}

#ifdef CONFIG_SMP
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0951d1c58d2f..54dc31e7ab9b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7089,7 +7089,7 @@ static void yield_task_fair(struct rq *rq)
* so we don't do microscopic update in schedule()
* and double the fastpath cost.
*/
- rq_clock_skip_update(rq, true);
+ rq_clock_skip_update(rq);
}

set_skip_buddy(se);
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 86b77987435e..7aef6b4e885a 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -839,6 +839,8 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
continue;

raw_spin_lock(&rq->lock);
+ update_rq_clock(rq);
+
if (rt_rq->rt_time) {
u64 runtime;

@@ -859,7 +861,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
* 'runtime'.
*/
if (rt_rq->rt_nr_running && rq->curr == rq->idle)
- rq_clock_skip_update(rq, false);
+ rq_clock_cancel_skipupdate(rq);
}
if (rt_rq->rt_time || rt_rq->rt_nr_running)
idle = 0;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c3deaee7a7a2..15750c222ca2 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -976,13 +976,20 @@ static inline u64 rq_clock_task(struct rq *rq)
return rq->clock_task;
}

-static inline void rq_clock_skip_update(struct rq *rq, bool skip)
+static inline void rq_clock_skip_update(struct rq *rq)
{
lockdep_assert_held(&rq->lock);
- if (skip)
- rq->clock_update_flags |= RQCF_REQ_SKIP;
- else
- rq->clock_update_flags &= ~RQCF_REQ_SKIP;
+ rq->clock_update_flags |= RQCF_REQ_SKIP;
+}
+
+/*
+ * See rt task throttoling, which is the only time a skip
+ * request is cancelled.
+ */
+static inline void rq_clock_cancel_skipupdate(struct rq *rq)
+{
+ lockdep_assert_held(&rq->lock);
+ rq->clock_update_flags &= ~RQCF_REQ_SKIP;
}

struct rq_flags {
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