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sched: move rcu_head to task_group struct

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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>
This commit is contained in:
Srivatsa Vaddagiri 2007-10-29 21:18:11 +01:00 committed by Ingo Molnar
parent 7bae49d498
commit ae8393e508
1 changed files with 4 additions and 4 deletions
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8
kernel/sched.c
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@ -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.