path: root/init
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authorPaul Turner <>2011-07-21 09:43:27 -0700
committerIngo Molnar <>2011-08-14 12:01:13 +0200
commit953bfcd10e6f3697233e8e5128c611d275da39c1 (patch)
treea3ca8136bb9e992bb40945c5eee2a8dcc0fd0b57 /init
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 <> Reviewed-by: Hidetoshi Seto <> Signed-off-by: Peter Zijlstra <> Link: Signed-off-by: Ingo Molnar <>
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