Daisuke Nishimura 7ceff013c4 sched: Fix cgroup movement of newly created process ... There is a small race between do_fork() and sched_move_task(), which is trying to move the child. do_fork() sched_move_task() --------------------------------+--------------------------------- copy_process() sched_fork() task_fork_fair() -> vruntime of the child is initialized based on that of the parent. -> we can see the child in "tasks" file now. task_rq_lock() task_move_group_fair() -> child.se.vruntime -= (old)cfs_rq->min_vruntime += (new)cfs_rq->min_vruntime task_rq_unlock() wake_up_new_task() ... enqueue_entity() child.se.vruntime += cfs_rq->min_vruntime As a result, vruntime of the child becomes far bigger than min_vruntime, if (new)cfs_rq->min_vruntime >> (old)cfs_rq->min_vruntime. This patch fixes this problem by just ignoring such process in task_move_group_fair(), because the vruntime has already been normalized in task_fork_fair(). Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/20111215143607.2ee12c5d.nishimura@mxp.nes.nec.co.jp Signed-off-by: Ingo Molnar <mingo@elte.hu>		2011-12-21 10:34:51 +01:00
..
auto_group.c
auto_group.h
clock.c
core.c	sched: Remove cfs bandwidth period check in tg_set_cfs_period()	2011-12-21 10:34:48 +01:00
cpupri.c
cpupri.h
debug.c
fair.c	sched: Fix cgroup movement of newly created process	2011-12-21 10:34:51 +01:00
features.h
idle_task.c
Makefile
rt.c
sched.h
stats.c
stats.h
stop_task.c