[PATCH v2 3/3] sched/deadline: Add statistics to track runtime underruns

Add accounting to track cases that runtime isn't running out, and export the information in "/proc//sched". Specifically, the patch adds three members "nr_underrun_sched", "nr_underrun_block", and "nr_underrun_yield" in sched_dl_entity: -@nr_underrun_sched hints some scheduling issue.

[PATCH v2 3/3] sched/deadline: Add statistics to track runtime underruns

Add accounting to track cases that runtime isn't running out, and export the information in "/proc//sched". Specifically, the patch adds three members "nr_underrun_sched", "nr_underrun_block", and "nr_underrun_yield" in sched_dl_entity: -@nr_underrun_sched hints some scheduling issue.