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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-02-29 15:21:01 -0500
committerIngo Molnar <mingo@elte.hu>2008-03-07 16:42:59 +0100
commit810b38179e9e4d4f57b4b733767bb08f8291a965 (patch)
tree91692de4fbd46879b29d803839b5bf7e25f30cd8
parentce4796d1e16cf3761dc2a02b8d588667d05b3078 (diff)
sched: retain vruntime
Kei Tokunaga reported an interactivity problem when moving tasks between control groups. Tasks would retain their old vruntime when moved between groups, this can cause funny lags. Re-set the vruntime on group move to fit within the new tree. Reported-by: Kei Tokunaga <tokunaga.keiich@jp.fujitsu.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/sched.h4
-rw-r--r--kernel/sched.c5
-rw-r--r--kernel/sched_fair.c14
3 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 9ae4030067a..11d8e9a74ef 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -899,6 +899,10 @@ struct sched_class {
int running);
void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
int oldprio, int running);
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ void (*moved_group) (struct task_struct *p);
+#endif
};
struct load_weight {
diff --git a/kernel/sched.c b/kernel/sched.c
index dcd553cc4ee..0b949c4e73a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7625,6 +7625,11 @@ void sched_move_task(struct task_struct *tsk)
set_task_rq(tsk, task_cpu(tsk));
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ if (tsk->sched_class->moved_group)
+ tsk->sched_class->moved_group(tsk);
+#endif
+
if (on_rq) {
if (unlikely(running))
tsk->sched_class->set_curr_task(rq);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 3df4d46994c..e2a53051561 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1353,6 +1353,16 @@ static void set_curr_task_fair(struct rq *rq)
set_next_entity(cfs_rq_of(se), se);
}
+#ifdef CONFIG_FAIR_GROUP_SCHED
+static void moved_group_fair(struct task_struct *p)
+{
+ struct cfs_rq *cfs_rq = task_cfs_rq(p);
+
+ update_curr(cfs_rq);
+ place_entity(cfs_rq, &p->se, 1);
+}
+#endif
+
/*
* All the scheduling class methods:
*/
@@ -1381,6 +1391,10 @@ static const struct sched_class fair_sched_class = {
.prio_changed = prio_changed_fair,
.switched_to = switched_to_fair,
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ .moved_group = moved_group_fair,
+#endif
};
#ifdef CONFIG_SCHED_DEBUG