sched: Simplify update_cfs_shares parameters

Re-visiting this: Since update_cfs_shares will now only ever re-weight an
entity that is a relative parent of the current entity in enqueue_entity; we
can safely issue the account_entity_enqueue relative to that cfs_rq and avoid
the requirement for special handling of the enqueue case in update_cfs_shares.

Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110122044851.915214637@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 15 insertions, 17 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 18d38e4ec7ba..e0fa3ff7f194 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8510,7 +8510,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
                 /* Propagate contribution to hierarchy */
                 raw_spin_lock_irqsave(&rq->lock, flags);
                 for_each_sched_entity(se)
-                        update_cfs_shares(group_cfs_rq(se), 0);
+                        update_cfs_shares(group_cfs_rq(se));
                 raw_spin_unlock_irqrestore(&rq->lock, flags);
         }
 
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0c26e2df450e..0c550c841eee 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -540,7 +540,7 @@ static u64 sched_vslice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 }
 
 static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update);
-static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta);
+static void update_cfs_shares(struct cfs_rq *cfs_rq);
 
 /*
  * Update the current task's runtime statistics. Skip current tasks that
@@ -763,16 +763,15 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
                 list_del_leaf_cfs_rq(cfs_rq);
 }
 
-static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg,
-                                long weight_delta)
+static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
 {
         long load_weight, load, shares;
 
-        load = cfs_rq->load.weight + weight_delta;
+        load = cfs_rq->load.weight;
 
         load_weight = atomic_read(&tg->load_weight);
-        load_weight -= cfs_rq->load_contribution;
         load_weight += load;
+        load_weight -= cfs_rq->load_contribution;
 
         shares = (tg->shares * load);
         if (load_weight)
@@ -790,7 +789,7 @@ static void update_entity_shares_tick(struct cfs_rq *cfs_rq)
 {
         if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) {
                 update_cfs_load(cfs_rq, 0);
-                update_cfs_shares(cfs_rq, 0);
+                update_cfs_shares(cfs_rq);
         }
 }
 # else /* CONFIG_SMP */
@@ -798,8 +797,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
 {
 }
 
-static inline long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg,
-                                long weight_delta)
+static inline long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
 {
         return tg->shares;
 }
@@ -824,7 +822,7 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
                 account_entity_enqueue(cfs_rq, se);
 }
 
-static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta)
+static void update_cfs_shares(struct cfs_rq *cfs_rq)
 {
         struct task_group *tg;
         struct sched_entity *se;
@@ -838,7 +836,7 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta)
         if (likely(se->load.weight == tg->shares))
                 return;
 #endif
-        shares = calc_cfs_shares(cfs_rq, tg, weight_delta);
+        shares = calc_cfs_shares(cfs_rq, tg);
 
         reweight_entity(cfs_rq_of(se), se, shares);
 }
@@ -847,7 +845,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
 {
 }
 
-static inline void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta)
+static inline void update_cfs_shares(struct cfs_rq *cfs_rq)
 {
 }
 
@@ -978,8 +976,8 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
          */
         update_curr(cfs_rq);
         update_cfs_load(cfs_rq, 0);
-        update_cfs_shares(cfs_rq, se->load.weight);
         account_entity_enqueue(cfs_rq, se);
+        update_cfs_shares(cfs_rq);
 
         if (flags & ENQUEUE_WAKEUP) {
                 place_entity(cfs_rq, se, 0);
@@ -1041,7 +1039,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
         update_cfs_load(cfs_rq, 0);
         account_entity_dequeue(cfs_rq, se);
         update_min_vruntime(cfs_rq);
-        update_cfs_shares(cfs_rq, 0);
+        update_cfs_shares(cfs_rq);
 
         /*
          * Normalize the entity after updating the min_vruntime because the
@@ -1282,7 +1280,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
                 struct cfs_rq *cfs_rq = cfs_rq_of(se);
 
                 update_cfs_load(cfs_rq, 0);
-                update_cfs_shares(cfs_rq, 0);
+                update_cfs_shares(cfs_rq);
         }
 
         hrtick_update(rq);
@@ -1312,7 +1310,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
                 struct cfs_rq *cfs_rq = cfs_rq_of(se);
 
                 update_cfs_load(cfs_rq, 0);
-                update_cfs_shares(cfs_rq, 0);
+                update_cfs_shares(cfs_rq);
         }
 
         hrtick_update(rq);
@@ -2123,7 +2121,7 @@ static int update_shares_cpu(struct task_group *tg, int cpu)
          * We need to update shares after updating tg->load_weight in
          * order to adjust the weight of groups with long running tasks.
          */
-        update_cfs_shares(cfs_rq, 0);
+        update_cfs_shares(cfs_rq);
 
         raw_spin_unlock_irqrestore(&rq->lock, flags);