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authorSrivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>2007-10-29 21:18:11 +0100
committerIngo Molnar <mingo@elte.hu>2007-10-29 21:18:11 +0100
commitae8393e508e5f17add66964688c49bf0bfe4fcf9 (patch)
tree41df1c369499d862b2b4a7896f938fd4d30463b7
parent7bae49d498de87f0da0c20c67adaa278eac84566 (diff)
sched: move rcu_head to task_group struct
Peter Zijlstra noticed that the rcu_head object need not be present in every cfs_rq of a group. Move it to the task_group structure instead. Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/sched.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 235952b100e..470480790f3 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -172,6 +172,7 @@ struct task_group {
unsigned long shares;
/* spinlock to serialize modification to shares */
spinlock_t lock;
+ struct rcu_head rcu;
};
/* Default task group's sched entity on each cpu */
@@ -258,7 +259,6 @@ struct cfs_rq {
*/
struct list_head leaf_cfs_rq_list; /* Better name : task_cfs_rq_list? */
struct task_group *tg; /* group that "owns" this runqueue */
- struct rcu_head rcu;
#endif
};
@@ -7019,8 +7019,8 @@ err:
/* rcu callback to free various structures associated with a task group */
static void free_sched_group(struct rcu_head *rhp)
{
- struct cfs_rq *cfs_rq = container_of(rhp, struct cfs_rq, rcu);
- struct task_group *tg = cfs_rq->tg;
+ struct task_group *tg = container_of(rhp, struct task_group, rcu);
+ struct cfs_rq *cfs_rq;
struct sched_entity *se;
int i;
@@ -7052,7 +7052,7 @@ void sched_destroy_group(struct task_group *tg)
BUG_ON(!cfs_rq);
/* wait for possible concurrent references to cfs_rqs complete */
- call_rcu(&cfs_rq->rcu, free_sched_group);
+ call_rcu(&tg->rcu, free_sched_group);
}
/* change task's runqueue when it moves between groups.