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sched/tg: Use 'unsigned long' for load variable in task group 

Since tg->load_avg is smaller than tg->load_weight, we don't need a
atomic64_t variable for load_avg in 32 bit machine.
The same reason for cfs_rq->tg_load_contrib.

The atomic_long_t/unsigned long variable type are more efficient and
convenience for them.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1371694737-29336-11-git-send-email-alex.shi@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alex Shi 2013-06-20 10:18:54 +08:00 committed by Ingo Molnar
parent 72a4cf20cb
commit bf5b986ed4
3 changed files with 11 additions and 11 deletions
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6
kernel/sched/debug.c
View File

@ -215,9 +215,9 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
cfs_rq->runnable_load_avg);
SEQ_printf(m, " .%-30s: %ld\n", "blocked_load_avg",
cfs_rq->blocked_load_avg);
SEQ_printf(m, " .%-30s: %lld\n", "tg_load_avg",
(unsigned long long)atomic64_read(&cfs_rq->tg->load_avg));
SEQ_printf(m, " .%-30s: %lld\n", "tg_load_contrib",
SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg",
atomic_long_read(&cfs_rq->tg->load_avg));
SEQ_printf(m, " .%-30s: %ld\n", "tg_load_contrib",
cfs_rq->tg_load_contrib);
SEQ_printf(m, " .%-30s: %d\n", "tg_runnable_contrib",
cfs_rq->tg_runnable_contrib);

12
kernel/sched/fair.c
View File

@ -1075,7 +1075,7 @@ static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
* to gain a more accurate current total weight. See
* update_cfs_rq_load_contribution().
*/
tg_weight = atomic64_read(&tg->load_avg);
tg_weight = atomic_long_read(&tg->load_avg);
tg_weight -= cfs_rq->tg_load_contrib;
tg_weight += cfs_rq->load.weight;
@ -1356,13 +1356,13 @@ 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;
long 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);
if (force_update || abs(tg_contrib) > cfs_rq->tg_load_contrib / 8) {
atomic_long_add(tg_contrib, &tg->load_avg);
cfs_rq->tg_load_contrib += tg_contrib;
}
}
@ -1397,8 +1397,8 @@ static inline void __update_group_entity_contrib(struct sched_entity *se)
u64 contrib;
contrib = cfs_rq->tg_load_contrib * tg->shares;
se->avg.load_avg_contrib = div64_u64(contrib,
atomic64_read(&tg->load_avg) + 1);
se->avg.load_avg_contrib = div_u64(contrib,
atomic_long_read(&tg->load_avg) + 1);
/*
* For group entities we need to compute a correction term in the case

4
kernel/sched/sched.h
View File

@ -150,7 +150,7 @@ struct task_group {
atomic_t load_weight;
#ifdef CONFIG_SMP
atomic64_t load_avg;
atomic_long_t load_avg;
atomic_t runnable_avg;
#endif
#endif
@ -284,7 +284,7 @@ struct cfs_rq {
#ifdef CONFIG_FAIR_GROUP_SCHED
/* Required to track per-cpu representation of a task_group */
u32 tg_runnable_contrib;
u64 tg_load_contrib;
unsigned long tg_load_contrib;
#endif /* CONFIG_FAIR_GROUP_SCHED */
/*