[PATCH v2] sched/deadline: overrun could happen in start_hrtick_dl

2014-07-13 Thread xiaofeng.yan
It could be wrong for the precision of runtime and deadline when the precision is within microsecond level. For example: Task runtime deadline period P1 200us 500us 500us This case need enbale HRTICK feature by the next command PC#echo "HRTICK" > /sys/kernel/debug/sched_features PC#trace-cm

[PATCH v2] sched/deadline: overrun could happen in start_hrtick_dl

2014-07-09 Thread xiaofeng.yan
It could be wrong for the precision of runtime and deadline when the precision is within microsecond level. For example: Task runtime deadline period P1 200us 500us 500us This case need enbale HRTICK feature by the next command PC#echo "HRTICK" > /sys/kernel/debug/sched_features PC#trace-cm