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cbb6589904
If you switch the cgroup of a sleeping thread, its vruntime does not get adjusted correctly for the difference between the min_vruntime values of the two groups. This patch adds a new callback, prep_move_task, to struct sched_class to give sched_fair the opportunity to adjust the task's vruntime just before setting its new group. This allows us to properly normalize a sleeping task's vruntime when moving it between different cgroups. More details about the problem: http://lkml.org/lkml/2010/9/28/24 Cc: Arve Hjønnevåg <arve@android.com> Signed-off-by: Dima Zavin <dima@android.com>