summaryrefslogtreecommitdiff
path: root/kernel/sched
diff options
context:
space:
mode:
authorSteve Muckle <steve.muckle@linaro.org>2016-03-24 15:26:07 -0700
committerIngo Molnar <mingo@kernel.org>2016-04-23 14:20:40 +0200
commita2c6c91f98247fef0fe75216d607812485aeb0df (patch)
tree6869393fd94f588a69e079f9ae4ea14d1dc68562 /kernel/sched
parent41e0d37f7ac81297c07ba311e4ad39465b8c8295 (diff)
sched/fair: Call cpufreq hook in additional paths
The cpufreq hook should be called any time the root CFS rq utilization changes. This can occur when a task is switched to or from the fair class, or a task moves between groups or CPUs, but these paths currently do not call the cpufreq hook. Fix this by adding the hook to attach_entity_load_avg() and detach_entity_load_avg(). Suggested-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Steve Muckle <smuckle@linaro.org> [ Added the .update_freq argument to update_cfs_rq_load_avg() to avoid a double cpufreq call. ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Byungchul Park <byungchul.park@lge.com> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Juri Lelli <Juri.Lelli@arm.com> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Morten Rasmussen <morten.rasmussen@arm.com> Cc: Patrick Bellasi <patrick.bellasi@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1458858367-2831-1-git-send-email-smuckle@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/fair.c73
1 files changed, 42 insertions, 31 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 81552819444c..c328bd77fe35 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2874,13 +2874,41 @@ static inline void update_tg_load_avg(struct cfs_rq *cfs_rq, int force) {}
static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq);
+static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq)
+{
+ struct rq *rq = rq_of(cfs_rq);
+ int cpu = cpu_of(rq);
+
+ if (cpu == smp_processor_id() && &rq->cfs == cfs_rq) {
+ unsigned long max = rq->cpu_capacity_orig;
+
+ /*
+ * There are a few boundary cases this might miss but it should
+ * get called often enough that that should (hopefully) not be
+ * a real problem -- added to that it only calls on the local
+ * CPU, so if we enqueue remotely we'll miss an update, but
+ * the next tick/schedule should update.
+ *
+ * It will not get called when we go idle, because the idle
+ * thread is a different class (!fair), nor will the utilization
+ * number include things like RT tasks.
+ *
+ * As is, the util number is not freq-invariant (we'd have to
+ * implement arch_scale_freq_capacity() for that).
+ *
+ * See cpu_util().
+ */
+ cpufreq_update_util(rq_clock(rq),
+ min(cfs_rq->avg.util_avg, max), max);
+ }
+}
+
/* Group cfs_rq's load_avg is used for task_h_load and update_cfs_share */
-static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
+static inline int
+update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
{
struct sched_avg *sa = &cfs_rq->avg;
- struct rq *rq = rq_of(cfs_rq);
int decayed, removed_load = 0, removed_util = 0;
- int cpu = cpu_of(rq);
if (atomic_long_read(&cfs_rq->removed_load_avg)) {
s64 r = atomic_long_xchg(&cfs_rq->removed_load_avg, 0);
@@ -2896,7 +2924,7 @@ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
removed_util = 1;
}
- decayed = __update_load_avg(now, cpu, sa,
+ decayed = __update_load_avg(now, cpu_of(rq_of(cfs_rq)), sa,
scale_load_down(cfs_rq->load.weight), cfs_rq->curr != NULL, cfs_rq);
#ifndef CONFIG_64BIT
@@ -2904,29 +2932,8 @@ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
cfs_rq->load_last_update_time_copy = sa->last_update_time;
#endif
- if (cpu == smp_processor_id() && &rq->cfs == cfs_rq &&
- (decayed || removed_util)) {
- unsigned long max = rq->cpu_capacity_orig;
-
- /*
- * There are a few boundary cases this might miss but it should
- * get called often enough that that should (hopefully) not be
- * a real problem -- added to that it only calls on the local
- * CPU, so if we enqueue remotely we'll miss an update, but
- * the next tick/schedule should update.
- *
- * It will not get called when we go idle, because the idle
- * thread is a different class (!fair), nor will the utilization
- * number include things like RT tasks.
- *
- * As is, the util number is not freq-invariant (we'd have to
- * implement arch_scale_freq_capacity() for that).
- *
- * See cpu_util().
- */
- cpufreq_update_util(rq_clock(rq),
- min(sa->util_avg, max), max);
- }
+ if (update_freq && (decayed || removed_util))
+ cfs_rq_util_change(cfs_rq);
return decayed || removed_load;
}
@@ -2947,7 +2954,7 @@ static inline void update_load_avg(struct sched_entity *se, int update_tg)
se->on_rq * scale_load_down(se->load.weight),
cfs_rq->curr == se, NULL);
- if (update_cfs_rq_load_avg(now, cfs_rq) && update_tg)
+ if (update_cfs_rq_load_avg(now, cfs_rq, true) && update_tg)
update_tg_load_avg(cfs_rq, 0);
}
@@ -2976,6 +2983,8 @@ skip_aging:
cfs_rq->avg.load_sum += se->avg.load_sum;
cfs_rq->avg.util_avg += se->avg.util_avg;
cfs_rq->avg.util_sum += se->avg.util_sum;
+
+ cfs_rq_util_change(cfs_rq);
}
static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
@@ -2988,6 +2997,8 @@ static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
cfs_rq->avg.load_sum = max_t(s64, cfs_rq->avg.load_sum - se->avg.load_sum, 0);
cfs_rq->avg.util_avg = max_t(long, cfs_rq->avg.util_avg - se->avg.util_avg, 0);
cfs_rq->avg.util_sum = max_t(s32, cfs_rq->avg.util_sum - se->avg.util_sum, 0);
+
+ cfs_rq_util_change(cfs_rq);
}
/* Add the load generated by se into cfs_rq's load average */
@@ -3005,7 +3016,7 @@ enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
cfs_rq->curr == se, NULL);
}
- decayed = update_cfs_rq_load_avg(now, cfs_rq);
+ decayed = update_cfs_rq_load_avg(now, cfs_rq, !migrated);
cfs_rq->runnable_load_avg += sa->load_avg;
cfs_rq->runnable_load_sum += sa->load_sum;
@@ -6213,7 +6224,7 @@ static void update_blocked_averages(int cpu)
if (throttled_hierarchy(cfs_rq))
continue;
- if (update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq))
+ if (update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, true))
update_tg_load_avg(cfs_rq, 0);
}
raw_spin_unlock_irqrestore(&rq->lock, flags);
@@ -6274,7 +6285,7 @@ static inline void update_blocked_averages(int cpu)
raw_spin_lock_irqsave(&rq->lock, flags);
update_rq_clock(rq);
- update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq);
+ update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, true);
raw_spin_unlock_irqrestore(&rq->lock, flags);
}