Recent changes to active load balance (sched2-fix-smt-scheduling-problems.patch
in -mm) is not resulting in any task movement from busiest to target_cpu.
Attached patch(ontop of -mm) fixes this issue.
Signed-off-by: Suresh Siddha <[email protected]>
--- linux-2.6.12-rc2-mm3/kernel/sched.c 2005-04-11 23:08:30.875103512 -0700
+++ linux/kernel/sched.c 2005-04-13 10:44:37.400829992 -0700
@@ -2131,7 +2131,7 @@
*/
static void active_load_balance(runqueue_t *busiest_rq, int busiest_cpu)
{
- struct sched_domain *tmp = NULL, *sd;
+ struct sched_domain *sd;
runqueue_t *target_rq;
int target_cpu = busiest_rq->push_cpu;
@@ -2152,13 +2152,10 @@
double_lock_balance(busiest_rq, target_rq);
/* Search for an sd spanning us and the target CPU. */
- for_each_domain(target_cpu, sd) {
+ for_each_domain(target_cpu, sd)
if ((sd->flags & SD_LOAD_BALANCE) &&
- cpu_isset(busiest_cpu, sd->span)) {
- sd = tmp;
+ cpu_isset(busiest_cpu, sd->span))
break;
- }
- }
if (unlikely(sd == NULL))
goto out;
-
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