[GIT PULL] workqueue core changes for 3.9-rc1

From: Tejun Heo
Date: Tue Feb 19 2013 - 12:39:45 EST

Hello, Linus.

This is pull request for workqueue core changes. A lot of
reorganization is going on mostly to prepare for worker pools with
custom attributes so that workqueue can replace custom pool
implementations in places including writeback and btrfs and make CPU
assignment in crypto more flexible.

workqueue evolved from purely per-cpu design and implementation, so
there are a lot of assumptions regarding being bound to CPUs and even
unbound workqueues are implemented as an extension of the model -
workqueues running on the special unbound CPU. Bulk of changes this
round are about promoting worker_pools as the top level abstraction
replacing global_cwq (global cpu workqueue). At this point, I'm
fairly confident about getting custom worker pools working pretty
soon and ready for the next merge window.

Lai's patches are replacing the convoluted mb() dancing workqueue has
been doing with much simpler mechanism which only depends on
assignment atomicity of long. For details, please read the commit
message of 0b3dae68ac ("workqueue: simplify is-work-item-queued-here
test"). While the change ends up adding one pointer to struct
delayed_work, the inflation in percentage is less than five percent
and it decouples delayed_work logic a lot more cleaner from usual work
handling, removes the unusual memory barrier dancing, and allows for
further simplification, so I think the trade-off is acceptable.

There will be two more workqueue related pull requests and there are
some shared commits among them. I'll write further pull requests
assuming this pull request is pulled first.

The above described changes (and some one-off ones) are available in
the following git branch

git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-3.9

for you to fetch changes up to 112202d9098aae2c36436e5178c0cf3ced423c7b:

workqueue: rename cpu_workqueue to pool_workqueue (2013-02-13 19:29:12 -0800)

Lai Jiangshan (7):
workqueue: replace WORK_CPU_NONE/LAST with WORK_CPU_END
workqueue: make work_busy() test WORK_STRUCT_PENDING first
workqueue: add delayed_work->wq to simplify reentrancy handling
workqueue: make work->data point to pool after try_to_grab_pending()
workqueue: simplify is-work-item-queued-here test
workqueue: make get_work_pool_id() cheaper
workqueue: pick cwq instead of pool in __queue_work()

Sasha Levin (1):
workqueue: use new hashtable implementation

Tejun Heo (28):
workqueue: consider work function when searching for busy work items
workqueue: fix find_worker_executing_work() brekage from hashtable conversion
workqueue: set PF_WQ_WORKER on rescuers
workqueue: rename kernel/workqueue_sched.h to kernel/workqueue_internal.h
workqueue: move struct worker definition to workqueue_internal.h
workqueue: implement current_is_async()
workqueue: unexport work_cpu()
workqueue: use std_ prefix for the standard per-cpu pools
workqueue: make GCWQ_DISASSOCIATED a pool flag
workqueue: make GCWQ_FREEZING a pool flag
workqueue: introduce WORK_OFFQ_CPU_NONE
workqueue: add worker_pool->id
workqueue: record pool ID instead of CPU in work->data when off-queue
workqueue: move busy_hash from global_cwq to worker_pool
workqueue: move global_cwq->cpu to worker_pool
workqueue: move global_cwq->lock to worker_pool
workqueue: make hotplug processing per-pool
workqueue: make freezing/thawing per-pool
workqueue: replace for_each_worker_pool() with for_each_std_worker_pool()
workqueue: remove worker_pool->gcwq
workqueue: remove global_cwq
workqueue: rename nr_running variables
workqueue: post global_cwq removal cleanups
workqueue: cosmetic update in try_to_grab_pending()
workqueue: move nr_running into worker_pool
workqueue: fix is_chained_work() regression
workqueue: reimplement is_chained_work() using current_wq_worker()
workqueue: rename cpu_workqueue to pool_workqueue

include/linux/async.h | 1 +
include/linux/workqueue.h | 35 +-
include/trace/events/workqueue.h | 10 +-
kernel/async.c | 14 +
kernel/sched/core.c | 2 +-
kernel/workqueue.c | 1528 ++++++++++++++++++--------------------
kernel/workqueue_internal.h | 65 ++
kernel/workqueue_sched.h | 9 -
8 files changed, 817 insertions(+), 847 deletions(-)
create mode 100644 kernel/workqueue_internal.h
delete mode 100644 kernel/workqueue_sched.h


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