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sched: track the next-highest priority on each runqueue

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We will use this later in the series to reduce the amount of rq-lock
contention during a pull operation

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
This commit is contained in:
Gregory Haskins
2008-12-29 09:39:49 -05:00
parent 4d9842776a
commit e864c499d9
2 changed files with 67 additions and 22 deletions
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8
kernel/sched.c
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@@ -463,7 +463,10 @@ struct rt_rq {
struct rt_prio_array active;
unsigned long rt_nr_running;
#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
int highest_prio; /* highest queued rt task prio */
struct {
int curr; /* highest queued rt task prio */
int next; /* next highest */
} highest_prio;
#endif
#ifdef CONFIG_SMP
unsigned long rt_nr_migratory;
@@ -8169,7 +8172,8 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
__set_bit(MAX_RT_PRIO, array->bitmap);
#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
rt_rq->highest_prio = MAX_RT_PRIO;
rt_rq->highest_prio.curr = MAX_RT_PRIO;
rt_rq->highest_prio.next = MAX_RT_PRIO;
#endif
#ifdef CONFIG_SMP
rt_rq->rt_nr_migratory = 0;