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authorPaul Turner <pjt@google.com>2011-07-21 09:43:27 -0700
committerIngo Molnar <mingo@elte.hu>2011-08-14 12:01:13 +0200
commit953bfcd10e6f3697233e8e5128c611d275da39c1 (patch)
treea3ca8136bb9e992bb40945c5eee2a8dcc0fd0b57 /kernel/sched_rt.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_rt.c')
-rw-r--r--kernel/sched_rt.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index a8c207ff3492..a9d3c6bc684a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -936,6 +936,8 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags)
if (!task_current(rq, p) && p->rt.nr_cpus_allowed > 1)
enqueue_pushable_task(rq, p);
+
+ inc_nr_running(rq);
}
static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags)
@@ -946,6 +948,8 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags)
dequeue_rt_entity(rt_se);
dequeue_pushable_task(rq, p);
+
+ dec_nr_running(rq);
}
/*
@@ -1841,4 +1845,3 @@ static void print_rt_stats(struct seq_file *m, int cpu)
rcu_read_unlock();
}
#endif /* CONFIG_SCHED_DEBUG */
-