From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
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 <suresh.b.siddha@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
kernel/sched.c | 9 +++------
1 files changed, 3 insertions(+), 6 deletions(-)
diff -puN kernel/sched.c~sched2-fix-smt-scheduling-problems-fix kernel/sched.c
--- 25/kernel/sched.c~sched2-fix-smt-scheduling-problems-fix 2005-04-25 18:32:19.005310240 -0700
+++ 25-akpm/kernel/sched.c 2005-04-25 18:32:28.330892536 -0700
@@ -2106,7 +2106,7 @@ static inline void idle_balance(int this
*/
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;
@@ -2127,13 +2127,10 @@ static void active_load_balance(runqueue
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;
_