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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2007-10-15 17:00:18 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:18 +0200
commitff56b2f01537aef7237d5ac8bf6bfbb409c1a127 (patch)
tree52f7a687f8d3e15b17dc8e6a1789cc537e87d6c8
parentda84d96176729fb48a8458561e5d8647103168b8 (diff)
sched: activate task_hot() only on fair-scheduled tasks
activate task_hot() only for fair-scheduled tasks (i.e. disable it for RT tasks). Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/sched.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 089d8b12ab7..945ab1322e1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2122,11 +2122,16 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
* Is this task likely cache-hot:
*/
static inline int
-task_hot(struct task_struct *p, unsigned long long now, struct sched_domain *sd)
+task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
{
- s64 delta = now - p->se.exec_start;
+ s64 delta;
- return delta < (long long)sysctl_sched_migration_cost;
+ if (p->sched_class != &fair_sched_class)
+ return 0;
+
+ delta = now - p->se.exec_start;
+
+ return delta < (s64)sysctl_sched_migration_cost;
}
/*