From 1e876231785d82443a5ac8b6c660e9f51bc5dede Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 17 May 2011 16:21:10 -0700 Subject: [PATCH] sched: Fix ->min_vruntime calculation in dequeue_entity() Dima Zavin reported: "After pulling the thread off the run-queue during a cgroup change, the cfs_rq.min_vruntime gets recalculated. The dequeued thread's vruntime then gets normalized to this new value. This can then lead to the thread getting an unfair boost in the new group if the vruntime of the next task in the old run-queue was way further ahead." Reported-by: Dima Zavin Signed-off-by: John Stultz Recalls-having-tested-once-upon-a-time-by: Mike Galbraith Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1305674470-23727-1-git-send-email-john.stultz@linaro.org Signed-off-by: Ingo Molnar --- kernel/sched_fair.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index e32a9b70ee9c..433491c2dc8f 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1076,8 +1076,6 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) se->on_rq = 0; update_cfs_load(cfs_rq, 0); account_entity_dequeue(cfs_rq, se); - update_min_vruntime(cfs_rq); - update_cfs_shares(cfs_rq); /* * Normalize the entity after updating the min_vruntime because the @@ -1086,6 +1084,9 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) */ if (!(flags & DEQUEUE_SLEEP)) se->vruntime -= cfs_rq->min_vruntime; + + update_min_vruntime(cfs_rq); + update_cfs_shares(cfs_rq); } /* -- GitLab