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authorIngo Molnar <mingo@elte.hu>2007-10-15 17:00:12 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:12 +0200
commit5522d5d5f70005faeffff3ffc0cfa8eec0155de4 (patch)
treed05fc41d19b8a70102a0ad3ad7ed8f6fd2d1cf7d /kernel
parentb9fa3df33f9166daf81bfa8253d339f5a7726122 (diff)
sched: mark scheduling classes as const
mark scheduling classes as const. The speeds up the code a bit and shrinks it: text data bss dec hex filename 40027 4018 292 44337 ad31 sched.o.before 40190 3842 292 44324 ad24 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c17
-rw-r--r--kernel/sched_fair.c5
-rw-r--r--kernel/sched_idletask.c3
-rw-r--r--kernel/sched_rt.c3
4 files changed, 11 insertions, 17 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index e1657e0c86d0..f582e2cedb09 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -847,9 +847,9 @@ static int balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
int *this_best_prio, struct rq_iterator *iterator);
#include "sched_stats.h"
-#include "sched_rt.c"
-#include "sched_fair.c"
#include "sched_idletask.c"
+#include "sched_fair.c"
+#include "sched_rt.c"
#ifdef CONFIG_SCHED_DEBUG
# include "sched_debug.c"
#endif
@@ -2251,7 +2251,7 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
struct sched_domain *sd, enum cpu_idle_type idle,
int *all_pinned)
{
- struct sched_class *class = sched_class_highest;
+ const struct sched_class *class = sched_class_highest;
unsigned long total_load_moved = 0;
int this_best_prio = this_rq->curr->prio;
@@ -2276,7 +2276,7 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
static int move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
struct sched_domain *sd, enum cpu_idle_type idle)
{
- struct sched_class *class;
+ const struct sched_class *class;
int this_best_prio = MAX_PRIO;
for (class = sched_class_highest; class; class = class->next)
@@ -3432,7 +3432,7 @@ static inline void schedule_debug(struct task_struct *prev)
static inline struct task_struct *
pick_next_task(struct rq *rq, struct task_struct *prev)
{
- struct sched_class *class;
+ const struct sched_class *class;
struct task_struct *p;
/*
@@ -6504,13 +6504,6 @@ void __init sched_init(void)
int highest_cpu = 0;
int i, j;
- /*
- * Link up the scheduling class hierarchy:
- */
- rt_sched_class.next = &fair_sched_class;
- fair_sched_class.next = &idle_sched_class;
- idle_sched_class.next = NULL;
-
for_each_possible_cpu(i) {
struct rt_prio_array *array;
struct rq *rq;
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index de13a6f5b977..32fd976f8566 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -76,8 +76,6 @@ const_debug unsigned int sysctl_sched_batch_wakeup_granularity = 25000000UL;
*/
const_debug unsigned int sysctl_sched_wakeup_granularity = 2000000UL;
-extern struct sched_class fair_sched_class;
-
/**************************************************************
* CFS operations on generic schedulable entities:
*/
@@ -1031,7 +1029,8 @@ static void set_curr_task_fair(struct rq *rq)
/*
* All the scheduling class methods:
*/
-struct sched_class fair_sched_class __read_mostly = {
+static const struct sched_class fair_sched_class = {
+ .next = &idle_sched_class,
.enqueue_task = enqueue_task_fair,
.dequeue_task = dequeue_task_fair,
.yield_task = yield_task_fair,
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 5ebf829cdd73..6e2ead41516e 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -57,7 +57,8 @@ static void set_curr_task_idle(struct rq *rq)
/*
* Simple, special scheduling class for the per-CPU idle tasks:
*/
-static struct sched_class idle_sched_class __read_mostly = {
+const struct sched_class idle_sched_class = {
+ /* .next is NULL */
/* no enqueue/yield_task for idle tasks */
/* dequeue is not valid, we print a debug message there: */
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index e1d5f1c8b532..dbe4d8cf80d6 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -225,7 +225,8 @@ static void set_curr_task_rt(struct rq *rq)
p->se.exec_start = rq->clock;
}
-static struct sched_class rt_sched_class __read_mostly = {
+const struct sched_class rt_sched_class = {
+ .next = &fair_sched_class,
.enqueue_task = enqueue_task_rt,
.dequeue_task = dequeue_task_rt,
.yield_task = yield_task_rt,