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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 10:42:59 -0500
commit810b38179e9e4d4f57b4b733767bb08f8291a965 (patch)
tree91692de4fbd46879b29d803839b5bf7e25f30cd8 /kernel/sched_fair.c
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>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 3df4d46994ca..e2a530515619 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1353,6 +1353,16 @@ static void set_curr_task_fair(struct rq *rq)
1353 set_next_entity(cfs_rq_of(se), se); 1353 set_next_entity(cfs_rq_of(se), se);
1354} 1354}
1355 1355
1356#ifdef CONFIG_FAIR_GROUP_SCHED
1357static void moved_group_fair(struct task_struct *p)
1358{
1359 struct cfs_rq *cfs_rq = task_cfs_rq(p);
1360
1361 update_curr(cfs_rq);
1362 place_entity(cfs_rq, &p->se, 1);
1363}
1364#endif
1365
1356/* 1366/*
1357 * All the scheduling class methods: 1367 * All the scheduling class methods:
1358 */ 1368 */
@@ -1381,6 +1391,10 @@ static const struct sched_class fair_sched_class = {
1381 1391
1382 .prio_changed = prio_changed_fair, 1392 .prio_changed = prio_changed_fair,
1383 .switched_to = switched_to_fair, 1393 .switched_to = switched_to_fair,
1394
1395#ifdef CONFIG_FAIR_GROUP_SCHED
1396 .moved_group = moved_group_fair,
1397#endif
1384}; 1398};
1385 1399
1386#ifdef CONFIG_SCHED_DEBUG 1400#ifdef CONFIG_SCHED_DEBUG