From: Ingo Molnar <mingo@elte.hu>
Shortcut escape from this queue if a hot task is met. I'm skeptical that
it is good, but again it gives ppl something to test.
---
25-akpm/kernel/sched.c | 11 ++++++++---
1 files changed, 8 insertions(+), 3 deletions(-)
diff -puN kernel/sched.c~sched-migrate-shortcut kernel/sched.c
--- 25/kernel/sched.c~sched-migrate-shortcut Mon Apr 26 15:31:41 2004
+++ 25-akpm/kernel/sched.c Mon Apr 26 15:31:41 2004
@@ -1311,7 +1311,7 @@ int can_migrate_task(task_t *p, runqueue
if (idle == NEWLY_IDLE ||
sd->nr_balance_failed < sd->cache_nice_tries) {
if (task_hot(p, rq->timestamp_last_tick, sd))
- return 0;
+ return -1;
}
return 1;
@@ -1330,7 +1330,7 @@ static int move_tasks(runqueue_t *this_r
{
prio_array_t *array, *dst_array;
struct list_head *head, *curr;
- int idx, pulled = 0;
+ int ret, idx, pulled = 0;
task_t *tmp;
if (max_nr_move <= 0 || busiest->nr_running <= 1)
@@ -1369,7 +1369,12 @@ skip_queue:
curr = curr->next;
- if (!can_migrate_task(tmp, busiest, this_cpu, sd, idle)) {
+ ret = can_migrate_task(tmp, busiest, this_cpu, sd, idle);
+ if (ret == -1) {
+ idx++;
+ goto skip_bitmap;
+ }
+ if (!ret) {
if (curr != head)
goto skip_queue;
idx++;
_