lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

sched: revert recent removal of set_curr_task()

Browse Source 
Revert removal of set_curr_task.
Use put_prev_task/set_curr_task when changing groups/policies

Signed-off-by: Srivatsa Vaddagiri < vatsa@linux.vnet.ibm.com>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
This commit is contained in:
Srivatsa Vaddagiri
2007-10-15 17:00:08 +02:00
committed by Ingo Molnar
parent edcb60a309
commit 83b699ed20
5 changed files with 72 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
kernel/sched_fair.c
View File

@@ -472,19 +472,8 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
}
static void
enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
int wakeup, int set_curr)
enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup)
{
/*
* In case of the 'current'.
*/
if (unlikely(set_curr)) {
update_stats_curr_start(cfs_rq, se);
cfs_rq->curr = se;
account_entity_enqueue(cfs_rq, se);
return;
}
/*
* Update the fair clock.
*/
@@ -496,7 +485,8 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
}
update_stats_enqueue(cfs_rq, se);
__enqueue_entity(cfs_rq, se);
if (se != cfs_rq->curr)
__enqueue_entity(cfs_rq, se);
account_entity_enqueue(cfs_rq, se);
}
@@ -516,12 +506,8 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
}
}
#endif
if (likely(se != cfs_rq->curr))
if (se != cfs_rq->curr)
__dequeue_entity(cfs_rq, se);
else {
update_stats_curr_end(cfs_rq, se);
cfs_rq->curr = NULL;
}
account_entity_dequeue(cfs_rq, se);
}
@@ -539,15 +525,20 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
resched_task(rq_of(cfs_rq)->curr);
}
static inline void
static void
set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
/*
* Any task has to be enqueued before it get to execute on
* a CPU. So account for the time it spent waiting on the
* runqueue.
*/
update_stats_wait_end(cfs_rq, se);
/* 'current' is not kept within the tree. */
if (se->on_rq) {
/*
* Any task has to be enqueued before it get to execute on
* a CPU. So account for the time it spent waiting on the
* runqueue.
*/
update_stats_wait_end(cfs_rq, se);
__dequeue_entity(cfs_rq, se);
}
update_stats_curr_start(cfs_rq, se);
cfs_rq->curr = se;
#ifdef CONFIG_SCHEDSTATS
@@ -568,10 +559,6 @@ static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq)
{
struct sched_entity *se = __pick_next_entity(cfs_rq);
/* 'current' is not kept within the tree. */
if (se)
__dequeue_entity(cfs_rq, se);
set_next_entity(cfs_rq, se);
return se;
@@ -703,17 +690,12 @@ static void enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup)
{
struct cfs_rq *cfs_rq;
struct sched_entity *se = &p->se;
int set_curr = 0;
/* Are we enqueuing the current task? */
if (unlikely(task_running(rq, p)))
set_curr = 1;
for_each_sched_entity(se) {
if (se->on_rq)
break;
cfs_rq = cfs_rq_of(se);
enqueue_entity(cfs_rq, se, wakeup, set_curr);
enqueue_entity(cfs_rq, se, wakeup);
}
}
@@ -761,7 +743,7 @@ static void yield_task_fair(struct rq *rq)
* position within the tree:
*/
dequeue_entity(cfs_rq, se, 0);
enqueue_entity(cfs_rq, se, 0, 1);
enqueue_entity(cfs_rq, se, 0);
return;
}
@@ -1004,6 +986,19 @@ static void task_new_fair(struct rq *rq, struct task_struct *p)
resched_task(rq->curr);
}
/* Account for a task changing its policy or group.
*
* This routine is mostly called to set cfs_rq->curr field when a task
* migrates between groups/classes.
*/
static void set_curr_task_fair(struct rq *rq)
{
struct sched_entity *se = &rq->curr->se;
for_each_sched_entity(se)
set_next_entity(cfs_rq_of(se), se);
}
/*
* All the scheduling class methods:
*/
@@ -1019,6 +1014,7 @@ struct sched_class fair_sched_class __read_mostly = {
.load_balance = load_balance_fair,
.set_curr_task = set_curr_task_fair,
.task_tick = task_tick_fair,
.task_new = task_new_fair,
};