Re: [PATCH v5 6/7] sched/deadline: Deferrable dl server

[Steven Rostedt]

Just got this too (with the 20% we talked about on IRC).

 migrate-991     6.....   713.996237: print:                tracing_mark_write: thread 7 iter 3 sleeping

The above is 991 in userspace writing to trace_marker

 migrate-991     6d..2.   713.996251: bprint:               __schedule: Pick userspin:973:120

I added the above printk in the core pick_next_task().

 migrate-991     6d..2.   713.996254: sched_switch:         migrate:991 [90] S ==> userspin:973 [120]

We switch to userspin for just 16 microseconds, and notice, NEED_RESCHED is
not set.

userspin-973     6dN.2.   713.996270: bprint:               pick_task_rt: Pick RT migrate:988:93

The above printk is in pick_next_task_rt(), and NEED_RESCHED is now set!

userspin-973     6dN.2.   713.996271: bprint:               __schedule: Pick migrate:988:93
userspin-973     6d..2.   713.996272: sched_switch:         userspin:973 [120] R ==> migrate:988 [93]

I'll add your latest patch and see if that's different.

I'll also test this without any of the patches first.

-- Steve