sched: remove the sleep-bonus interactivity code
remove the sleep-bonus interactivity code from the core scheduler.
scheduling policy is implemented in the policy modules, and CFS does
not need such type of heuristics.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index 8e44da6..f5a204b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -894,7 +894,7 @@
{
int bonus, prio;
- bonus = CURRENT_BONUS(p) - MAX_BONUS / 2;
+ bonus = 0;
prio = p->static_prio - bonus;
if (prio < MAX_RT_PRIO)
@@ -970,42 +970,6 @@
*/
static int recalc_task_prio(struct task_struct *p, unsigned long long now)
{
- /* Caller must always ensure 'now >= p->timestamp' */
- unsigned long sleep_time = now - p->timestamp;
-
- if (batch_task(p))
- sleep_time = 0;
-
- if (likely(sleep_time > 0)) {
- /*
- * This ceiling is set to the lowest priority that would allow
- * a task to be reinserted into the active array on timeslice
- * completion.
- */
- unsigned long ceiling = INTERACTIVE_SLEEP(p);
-
- if (p->mm && sleep_time > ceiling && p->sleep_avg < ceiling) {
- /*
- * Prevents user tasks from achieving best priority
- * with one single large enough sleep.
- */
- p->sleep_avg = ceiling;
- } else {
- /*
- * This code gives a bonus to interactive tasks.
- *
- * The boost works by updating the 'average sleep time'
- * value here, based on ->timestamp. The more time a
- * task spends sleeping, the higher the average gets -
- * and the higher the priority boost gets as well.
- */
- p->sleep_avg += sleep_time;
-
- }
- if (p->sleep_avg > NS_MAX_SLEEP_AVG)
- p->sleep_avg = NS_MAX_SLEEP_AVG;
- }
-
return effective_prio(p);
}
@@ -3560,9 +3524,6 @@
clear_tsk_need_resched(prev);
rcu_qsctr_inc(task_cpu(prev));
- prev->sleep_avg -= run_time;
- if ((long)prev->sleep_avg <= 0)
- prev->sleep_avg = 0;
prev->timestamp = prev->last_ran = now;
sched_info_switch(prev, next);
@@ -4204,11 +4165,6 @@
p->normal_prio = normal_prio(p);
/* we are holding p->pi_lock already */
p->prio = rt_mutex_getprio(p);
- /*
- * SCHED_BATCH tasks are treated as perpetual CPU hogs:
- */
- if (policy == SCHED_BATCH)
- p->sleep_avg = 0;
set_load_weight(p);
}
@@ -4931,7 +4887,6 @@
unsigned long flags;
idle->timestamp = sched_clock();
- idle->sleep_avg = 0;
idle->array = NULL;
idle->prio = idle->normal_prio = MAX_PRIO;
idle->state = TASK_RUNNING;
