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authorPaul Turner <pjt@google.com>2011-07-21 12:43:27 -0400
committerIngo Molnar <mingo@elte.hu>2011-08-14 06:01:13 -0400
commit953bfcd10e6f3697233e8e5128c611d275da39c1 (patch)
treea3ca8136bb9e992bb40945c5eee2a8dcc0fd0b57 /kernel/sched_stoptask.c
parent5710f15b52664ae0bfa60a66d75464769d297b2b (diff)
sched: Implement hierarchical task accounting for SCHED_OTHER
Introduce hierarchical task accounting for the group scheduling case in CFS, as well as promoting the responsibility for maintaining rq->nr_running to the scheduling classes. The primary motivation for this is that with scheduling classes supporting bandwidth throttling it is possible for entities participating in throttled sub-trees to not have root visible changes in rq->nr_running across activate and de-activate operations. This in turn leads to incorrect idle and weight-per-task load balance decisions. This also allows us to make a small fixlet to the fastpath in pick_next_task() under group scheduling. Note: this issue also exists with the existing sched_rt throttling mechanism. This patch does not address that. Signed-off-by: Paul Turner <pjt@google.com> Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110721184756.878333391@google.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_stoptask.c')
-rw-r--r--kernel/sched_stoptask.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched_stoptask.c b/kernel/sched_stoptask.c
index 6f437632afab..8b44e7fa7fb3 100644
--- a/kernel/sched_stoptask.c
+++ b/kernel/sched_stoptask.c
@@ -34,11 +34,13 @@ static struct task_struct *pick_next_task_stop(struct rq *rq)
34static void 34static void
35enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) 35enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags)
36{ 36{
37 inc_nr_running(rq);
37} 38}
38 39
39static void 40static void
40dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) 41dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags)
41{ 42{
43 dec_nr_running(rq);
42} 44}
43 45
44static void yield_task_stop(struct rq *rq) 46static void yield_task_stop(struct rq *rq)