[PATCH 00/10] workqueue: async worker destruction and pool-binding synchronization

[Lai Jiangshan]

Patch1-4: async worker destruction

The old version(https://lkml.org/lkml/2014/2/17/418) code of async worker
destruction has to dance with pool->lock and worker_idr, it is complicated.

But worker_idr in the new version dosn't requies pool->lock, and the code in
put_unbound_pool() which waits workers exit is changed to wait on a
wait_queue_head_t. These two changes make the new async worker destruction
much simpler.

Patch2 reduces the review burden. It will be easier to review the whole
patchset if we know destroy_worker() is forced to destroy idle workers only.

==========
Patch5-10: pool-binding synchronization and simplify the workers management

The code which binds a worker to the pool and unbind a worker from the pool
is unfolded in create_worker()/destroy_worker().
The patchset moves this pool-binding code out and wraps them.

patch3-4 moves the pool-unbinding code out from destroy_worker(), and make
manger_mutex only protects the pool-unbinding code only rather than
protects the whole worker-destruction path.

patch5-7 makes manger_mutex only protects the pool-binding code rather than the
whole worker-creation path.

patch8: rename manger_mutex to bind_mutex
patch9-10: moves the pool-binding code out from create_worker() and use it for
rescuer.

Lai Jiangshan (10):
  workqueue: use manager lock only to protect worker_idr
  workqueue: destroy_worker() should destroy idle workers only
  workqueue: async worker destruction
  workqueue: destroy worker directly in the idle timeout handler
  workqueue: separate iteration role from worker_idr
  workqueue: convert worker_idr to worker_ida
  workqueue: narrow the protection range of manager_mutex
  workqueue: rename manager_mutex to bind_mutex
  workqueue: separate pool-binding code out from create_worker()
  workqueue: use generic pool-bind/unbind routine for rescuers

 kernel/workqueue.c          |  396 +++++++++++++------------------------------
 kernel/workqueue_internal.h |    1 +
 2 files changed, 120 insertions(+), 277 deletions(-)

-- 
1.7.4.4

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