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Subject[RFC PATCH v2 0/5] sched: support schedstat for RT sched class
Date
We want to measure the latency of RT tasks in our production
environment with schedstat facility, but currently schedstat is only
supported for fair sched class. This patchset enable it for RT sched class
as well.

The schedstat statistics are defined in struct sched_entity, which is a
member of struct task_struct, so we can resue it for RT sched class.

The schedstat usage in RT sched class is similar with fair sched class,
for example,
fair RT
enqueue update_stats_enqueue_fair update_stats_enqueue_rt
dequeue update_stats_dequeue_fair update_stats_dequeue_rt
put_prev_task update_stats_wait_start update_stats_wait_start
set_next_task update_stats_wait_end update_stats_wait_end
show /proc/[pid]/sched /proc/[pid]/sched

The sched:sched_stats_* tracepoints can be used to trace RT tasks as
well after that patchset.

PATCH #1 ~ #4 are the preparation of PATCH #5.

- v2:
keep the schedstats functions inline, per Mel.

Yafang Shao (5):
sched: don't include stats.h in sched.h
sched: define task_of() as a common helper
sched: make schedstats helper independent of cfs_rq
sched: define update_stats_curr_start() as a common helper
sched, rt: support schedstat for RT sched class

kernel/sched/core.c | 1 +
kernel/sched/deadline.c | 1 +
kernel/sched/debug.c | 1 +
kernel/sched/fair.c | 174 ++-------------------------------------
kernel/sched/idle.c | 1 +
kernel/sched/rt.c | 94 ++++++++++++++++++++-
kernel/sched/sched.h | 30 ++++++-
kernel/sched/stats.c | 1 +
kernel/sched/stats.h | 146 ++++++++++++++++++++++++++++++++
kernel/sched/stop_task.c | 1 +
10 files changed, 280 insertions(+), 170 deletions(-)

--
2.18.4

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