This series is against topic-sunrpc-thread-scheduling (7fddd9be200c).
There are two changes since last post (other than dropping patches
that have been included in the topic branch.
1/ When I dropped the test on freezing(current), need needed to
add TASK_FREEZABLE to the wait state. I could keep testing
freezing(current) before calling schedule, but TASK_FREEZABLE
is cleaner and seems to be prefered ... except ...
/proc/PID/stat reports a status for "D" for tasks that are
TASK_IDLE | TASK_FREEZABLE
instead of the correct "I". I've included a fix for that in
the relevant patch. I should probably post is separately
to the scheduler team.
2/ There was a bug in lwq_dequeue(). It tested lwq_empty() without
taking the spinlock. This could result in call-positive results
if it raced with another lwq_dequeue(). So lwq_dequeue() now
ensure the queue never looks transiently empty.
lwq_empty() is also more careful about memory ordering.
NeilBrown
[PATCH 1/7] SUNRPC: change service idle list to be an llist
[PATCH 2/7] SUNRPC: only have one thread waking up at a time
[PATCH 3/7] SUNRPC/svc: add light-weight queuing mechanism.
[PATCH 4/7] SUNRPC: use lwq for sp_sockets - renamed to sp_xprts
[PATCH 5/7] SUNRPC: change sp_nrthreads to atomic_t
[PATCH 6/7] SUNRPC: discard sp_lock
[PATCH 7/7] SUNRPC: change the back-channel queue to lwq
