From 953bfcd10e6f3697233e8e5128c611d275da39c1 Mon Sep 17 00:00:00 2001 From: Paul Turner Date: Thu, 21 Jul 2011 09:43:27 -0700 Subject: 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 Reviewed-by: Hidetoshi Seto Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20110721184756.878333391@google.com Signed-off-by: Ingo Molnar --- kernel/sched_stoptask.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'kernel/sched_stoptask.c') 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) static void enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) { + inc_nr_running(rq); } static void dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) { + dec_nr_running(rq); } static void yield_task_stop(struct rq *rq) -- cgit v1.2.3