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authorBharata B Rao <bharata@linux.vnet.ibm.com>2008-09-25 09:53:54 +0530
committerIngo Molnar <mingo@elte.hu>2008-09-25 11:24:11 +0200
commitb87f17242da6b2ac6db2d179b2f93fb84cff2fbe (patch)
tree7c90ccd5b3a307670f939b944a2bf32d523a3b15 /kernel/sched_fair.c
parent57fdc26d4a734a3e00c6b2fc0e1e40ff8da4dc31 (diff)
downloadblackbird-op-linux-b87f17242da6b2ac6db2d179b2f93fb84cff2fbe.tar.gz
blackbird-op-linux-b87f17242da6b2ac6db2d179b2f93fb84cff2fbe.zip
sched: maintain only task entities in cfs_rq->tasks list
cfs_rq->tasks list is used by the load balancer to iterate over all the tasks. Currently it holds all the entities (both task and group entities) because of which there is a need to check for group entities explicitly during load balancing. This patch changes the cfs_rq->tasks list to hold only task entities. Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c26
1 files changed, 9 insertions, 17 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index e3f3c10f7033..95c1295ad26d 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -528,11 +528,12 @@ account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
update_load_add(&cfs_rq->load, se->load.weight);
if (!parent_entity(se))
inc_cpu_load(rq_of(cfs_rq), se->load.weight);
- if (entity_is_task(se))
+ if (entity_is_task(se)) {
add_cfs_task_weight(cfs_rq, se->load.weight);
+ list_add(&se->group_node, &cfs_rq->tasks);
+ }
cfs_rq->nr_running++;
se->on_rq = 1;
- list_add(&se->group_node, &cfs_rq->tasks);
}
static void
@@ -541,11 +542,12 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
update_load_sub(&cfs_rq->load, se->load.weight);
if (!parent_entity(se))
dec_cpu_load(rq_of(cfs_rq), se->load.weight);
- if (entity_is_task(se))
+ if (entity_is_task(se)) {
add_cfs_task_weight(cfs_rq, -se->load.weight);
+ list_del_init(&se->group_node);
+ }
cfs_rq->nr_running--;
se->on_rq = 0;
- list_del_init(&se->group_node);
}
static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
@@ -1335,19 +1337,9 @@ __load_balance_iterator(struct cfs_rq *cfs_rq, struct list_head *next)
if (next == &cfs_rq->tasks)
return NULL;
- /* Skip over entities that are not tasks */
- do {
- se = list_entry(next, struct sched_entity, group_node);
- next = next->next;
- } while (next != &cfs_rq->tasks && !entity_is_task(se));
-
- if (next == &cfs_rq->tasks && !entity_is_task(se))
- return NULL;
-
- cfs_rq->balance_iterator = next;
-
- if (entity_is_task(se))
- p = task_of(se);
+ se = list_entry(next, struct sched_entity, group_node);
+ p = task_of(se);
+ cfs_rq->balance_iterator = next->next;
return p;
}
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