[RFC 1/6] Revert "sched: introduce temporary FAIR_GROUP_SCHED dependency for load-tracking"

From: Vincent Guittot
Date: Sun Oct 07 2012 - 03:44:28 EST


This reverts commit f0494c69d387db9496b6f9aa71b3bc49f1dcf474.

Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
---
include/linux/sched.h | 8 +-------
kernel/sched/core.c | 7 +------
kernel/sched/fair.c | 13 ++-----------
kernel/sched/sched.h | 9 +--------
4 files changed, 5 insertions(+), 32 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f45da5f..4786b20 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1214,13 +1214,7 @@ struct sched_entity {
/* rq "owned" by this entity/group: */
struct cfs_rq *my_q;
#endif
-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
- /* Per-entity load-tracking */
+#ifdef CONFIG_SMP
struct sched_avg avg;
#endif
};
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b81915c..d50fbac 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1715,12 +1715,7 @@ static void __sched_fork(struct task_struct *p)
p->se.vruntime = 0;
INIT_LIST_HEAD(&p->se.group_node);

-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
+#ifdef CONFIG_SMP
p->se.avg.runnable_avg_period = 0;
p->se.avg.runnable_avg_sum = 0;
#endif
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 095d86c..4f4a4f6 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -877,8 +877,7 @@ static inline void update_cfs_shares(struct cfs_rq *cfs_rq)
}
#endif /* CONFIG_FAIR_GROUP_SCHED */

-/* Only depends on SMP, FAIR_GROUP_SCHED may be removed when useful in lb */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
+#ifdef CONFIG_SMP
/*
* We choose a half-life close to 1 scheduling period.
* Note: The tables below are dependent on this value.
@@ -3204,12 +3203,6 @@ unlock:
}

/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#ifdef CONFIG_FAIR_GROUP_SCHED
-/*
* Called immediately before a task is migrated to a new cpu; task_cpu(p) and
* cfs_rq_of(p) references at time of call are still valid and identify the
* previous cpu. However, the caller only guarantees p->pi_lock is held; no
@@ -3232,7 +3225,6 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu)
atomic64_add(se->avg.load_avg_contrib, &cfs_rq->removed_load);
}
}
-#endif
#endif /* CONFIG_SMP */

static unsigned long
@@ -5812,9 +5804,8 @@ const struct sched_class fair_sched_class = {

#ifdef CONFIG_SMP
.select_task_rq = select_task_rq_fair,
-#ifdef CONFIG_FAIR_GROUP_SCHED
.migrate_task_rq = migrate_task_rq_fair,
-#endif
+
.rq_online = rq_online_fair,
.rq_offline = rq_offline_fair,

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 81135f9..a95d5c1 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -225,12 +225,6 @@ struct cfs_rq {
#endif

#ifdef CONFIG_SMP
-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#ifdef CONFIG_FAIR_GROUP_SCHED
/*
* CFS Load tracking
* Under CFS, load is tracked on a per-entity basis and aggregated up.
@@ -240,8 +234,7 @@ struct cfs_rq {
u64 runnable_load_avg, blocked_load_avg;
atomic64_t decay_counter, removed_load;
u64 last_decay;
-#endif /* CONFIG_FAIR_GROUP_SCHED */
-/* These always depend on CONFIG_FAIR_GROUP_SCHED */
+
#ifdef CONFIG_FAIR_GROUP_SCHED
u32 tg_runnable_contrib, tg_usage_contrib;
u64 tg_load_contrib;
--
1.7.9.5

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