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sched: remove PREEMPT_RESTRICT

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remove PREEMPT_RESTRICT. (this is a separate commit so that any
regression related to the removal itself is bisectable)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-11-09 22:39:39 +01:00
parent 52d3da1ad4
commit 3e3e13f399
3 changed files with 3 additions and 12 deletions
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1
include/linux/sched.h
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@ -863,7 +863,6 @@ struct sched_entity {
struct load_weight load; /* for load-balancing */
struct rb_node run_node;
unsigned int on_rq;
int peer_preempt;
u64 exec_start;
u64 sum_exec_runtime;

4
kernel/sched.c
View file

@ -460,7 +460,6 @@ enum {
SCHED_FEAT_TREE_AVG = 4,
SCHED_FEAT_APPROX_AVG = 8,
SCHED_FEAT_WAKEUP_PREEMPT = 16,
SCHED_FEAT_PREEMPT_RESTRICT = 32,
};
const_debug unsigned int sysctl_sched_features =
@ -468,8 +467,7 @@ const_debug unsigned int sysctl_sched_features =
SCHED_FEAT_START_DEBIT * 1 |
SCHED_FEAT_TREE_AVG * 0 |
SCHED_FEAT_APPROX_AVG * 0 |
SCHED_FEAT_WAKEUP_PREEMPT * 1 |
SCHED_FEAT_PREEMPT_RESTRICT * 0;
SCHED_FEAT_WAKEUP_PREEMPT * 1;
#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)

10
kernel/sched_fair.c
View file

@ -546,7 +546,6 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
update_stats_dequeue(cfs_rq, se);
if (sleep) {
se->peer_preempt = 0;
#ifdef CONFIG_SCHEDSTATS
if (entity_is_task(se)) {
struct task_struct *tsk = task_of(se);
@ -574,10 +573,8 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
ideal_runtime = sched_slice(cfs_rq, curr);
delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
if (delta_exec > ideal_runtime ||
(sched_feat(PREEMPT_RESTRICT) && curr->peer_preempt))
if (delta_exec > ideal_runtime)
resched_task(rq_of(cfs_rq)->curr);
curr->peer_preempt = 0;
}
static void
@ -867,9 +864,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
gran = calc_delta_fair(gran, &se->load);
if (delta > gran) {
int now = !sched_feat(PREEMPT_RESTRICT);
if (now || p->prio < curr->prio || !se->peer_preempt++)
if (p->prio < curr->prio)
resched_task(curr);
}
}
@ -1083,7 +1078,6 @@ static void task_new_fair(struct rq *rq, struct task_struct *p)
swap(curr->vruntime, se->vruntime);
}
se->peer_preempt = 0;
enqueue_task_fair(rq, p, 0);
resched_task(rq->curr);
}