On 25/02/14 20:52, Peter Zijlstra wrote:
> On Tue, Feb 25, 2014 at 11:47:42AM +0000, Dietmar Eggemann wrote:
>> +++ b/kernel/sched/sched.h
>> @@ -630,7 +630,9 @@ struct rq {
>> struct llist_head wake_list;
>> #endif
>>
>> +#ifdef CONFIG_FAIR_GROUP_SCHED
>> struct sched_avg avg;
>> +#endif
>> };
>
> There is already a CONFIG_FAIR_GROUP_SCHED #ifdef in that structure;
> does it make sense to move this variable in there instead of adding yet
> another #ifdef?
>
I changed the patch accordingly.
-- >8 --
Subject: [PATCH] sched: put rq's sched_avg under CONFIG_FAIR_GROUP_SCHED
The struct sched_avg of struct rq is only used in case group
scheduling is enabled inside __update_tg_runnable_avg() to update
per-cpu representation of a task group. I.e. that there is no need to
maintain the runnable avg of a rq in the !CONFIG_FAIR_GROUP_SCHED case.
This patch guards struct sched_avg of struct rq and
update_rq_runnable_avg() with CONFIG_FAIR_GROUP_SCHED.
There is an extra empty definition for update_rq_runnable_avg()
necessary for the !CONFIG_FAIR_GROUP_SCHED && CONFIG_SMP case.
The function print_cfs_group_stats() which prints out struct sched_avg
of struct rq is already guarded with CONFIG_FAIR_GROUP_SCHED.
Signed-off-by: Dietmar Eggemann <dietmar.eggem...@arm.com>
---
kernel/sched/fair.c | 13 +++++++------
kernel/sched/sched.h | 4 ++--
2 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5f6ddbef80af..76c6513b6889 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2376,12 +2376,19 @@ static inline void __update_group_entity_contrib(struct
sched_entity *se)
se->avg.load_avg_contrib >>= NICE_0_SHIFT;
}
}
+
+static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
+{
+ __update_entity_runnable_avg(rq_clock_task(rq), &rq->avg, runnable);
+ __update_tg_runnable_avg(&rq->avg, &rq->cfs);
+}
#else /* CONFIG_FAIR_GROUP_SCHED */
static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
int force_update) {}
static inline void __update_tg_runnable_avg(struct sched_avg *sa,
struct cfs_rq *cfs_rq) {}
static inline void __update_group_entity_contrib(struct sched_entity *se) {}
+static inline void update_rq_runnable_avg(struct rq *rq, int runnable) {}
#endif /* CONFIG_FAIR_GROUP_SCHED */
static inline void __update_task_entity_contrib(struct sched_entity *se)
@@ -2480,12 +2487,6 @@ static void update_cfs_rq_blocked_load(struct cfs_rq
*cfs_rq, int force_update)
__update_cfs_rq_tg_load_contrib(cfs_rq, force_update);
}
-static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
-{
- __update_entity_runnable_avg(rq_clock_task(rq), &rq->avg, runnable);
- __update_tg_runnable_avg(&rq->avg, &rq->cfs);
-}
-
/* Add the load generated by se into cfs_rq's child load-average */
static inline void enqueue_entity_load_avg(struct cfs_rq *cfs_rq,
struct sched_entity *se,
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 4be68da1fe00..b1fb1a62c52d 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -540,6 +540,8 @@ struct rq {
#ifdef CONFIG_FAIR_GROUP_SCHED
/* list of leaf cfs_rq on this cpu: */
struct list_head leaf_cfs_rq_list;
+
+ struct sched_avg avg;
#endif /* CONFIG_FAIR_GROUP_SCHED */
/*
@@ -629,8 +631,6 @@ struct rq {
#ifdef CONFIG_SMP
struct llist_head wake_list;
#endif
-
- struct sched_avg avg;
};
static inline int cpu_of(struct rq *rq)
--
1.7.9.5
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