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sched: Aggregate total task_group load 

Maintain a global running sum of the average load seen on each cfs_rq belonging
to each task group so that it may be used in calculating an appropriate
shares:weight distribution.

Signed-off-by: Paul Turner <pjt@google.com>
Reviewed-by: Ben Segall <bsegall@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120823141506.792901086@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Paul Turner 2012-10-04 13:18:30 +02:00 committed by Ingo Molnar
parent aff3e49884
commit c566e8e9e4
3 changed files with 30 additions and 0 deletions
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4
kernel/sched/debug.c
View File

@ -230,6 +230,10 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
cfs_rq->runnable_load_avg);
SEQ_printf(m, " .%-30s: %lld\n", "blocked_load_avg",
cfs_rq->blocked_load_avg);
SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
atomic64_read(&cfs_rq->tg->load_avg));
SEQ_printf(m, " .%-30s: %lld\n", "tg_load_contrib",
cfs_rq->tg_load_contrib);
#endif
print_cfs_group_stats(m, cpu, cfs_rq->tg);

22
kernel/sched/fair.c
View File

@ -1102,6 +1102,26 @@ static inline u64 __synchronize_entity_decay(struct sched_entity *se)
return decays;
}
#ifdef CONFIG_FAIR_GROUP_SCHED
static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
int force_update)
{
struct task_group *tg = cfs_rq->tg;
s64 tg_contrib;
tg_contrib = cfs_rq->runnable_load_avg + cfs_rq->blocked_load_avg;
tg_contrib -= cfs_rq->tg_load_contrib;
if (force_update || abs64(tg_contrib) > cfs_rq->tg_load_contrib / 8) {
atomic64_add(tg_contrib, &tg->load_avg);
cfs_rq->tg_load_contrib += tg_contrib;
}
}
#else
static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
int force_update) {}
#endif
/* Compute the current contribution to load_avg by se, return any delta */
static long __update_entity_load_avg_contrib(struct sched_entity *se)
{
@ -1172,6 +1192,8 @@ static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update)
atomic64_add(decays, &cfs_rq->decay_counter);
cfs_rq->last_decay = now;
}
__update_cfs_rq_tg_load_contrib(cfs_rq, force_update);
}
static inline void update_rq_runnable_avg(struct rq *rq, int runnable)

4
kernel/sched/sched.h
View File

@ -112,6 +112,7 @@ struct task_group {
unsigned long shares;
atomic_t load_weight;
atomic64_t load_avg;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
@ -232,6 +233,9 @@ struct cfs_rq {
u64 runnable_load_avg, blocked_load_avg;
atomic64_t decay_counter, removed_load;
u64 last_decay;
#ifdef CONFIG_FAIR_GROUP_SCHED
u64 tg_load_contrib;
#endif
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */