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Subject[PATCHSET] workqueue: concurrency managed workqueue, take#5
Date
Hello, all.

This is the fifth take of cmwq (concurrency managed workqueue)
patchset. It's on top of v2.6.35-rc3 + sched/core patches. Git tree
is available at

git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-cmwq

Changes from the last take[L] are...

* fscache patches are omitted for now.

* The patchset is rebased on cpu_stop + sched/core, which now includes
all the necessary scheduler patches. cpu_stop already reimplements
stop_machine so that it doesn't use RT workqueue, so this patchset
simply drops RT wq support.

* __set_cpus_allowed() was determined to be unnecessary with recent
scheduler changes. On cpu re-onlining, cmwq now kills all idle
workers and tells busy ones to rebind after finishing the current
work by scheduling a dedicated work. This allows managing proper
cpu binding without adding overhead to hotpath.

* Oleg's clear work->data patch moved at the head of the queue and now
lives in the for-next branch which will be pushed to mainline on the
next merge window.

* Applied Oleg's review.

* Comments updated as suggested.

* work_flags_to_color() replaced w/ get_work_color()

* nr_cwqs_to_flush bug which could cause premature flush completion
fixed.

* Replace rewind + list_for_each_entry_safe_continue() w/
list_for_each_entry_safe_from().

* Don't directly write to *work_data_bits() but use __set_bit()
instead.

* Fixed cpu hotplug exclusion bug.

* Other misc tweaks.

Now that all scheduler bits are in place, I'll keep the tree stable
and publish it to linux-next soonish, so this hopefully is the last of
exhausting massive postings of this patchset.

Jeff, Arjan, I think it'll be best to route the libata and async
patches through wq tree. Would that be okay?

This patchset contains the following patches.

0001-sched-consult-online-mask-instead-of-active-in-selec.patch
0002-sched-rename-preempt_notifiers-to-sched_notifiers-an.patch
0003-sched-refactor-try_to_wake_up.patch
0004-sched-implement-__set_cpus_allowed.patch
0005-sched-make-sched_notifiers-unconditional.patch
0006-sched-add-wakeup-sleep-sched_notifiers-and-allow-NUL.patch
0007-sched-implement-try_to_wake_up_local.patch
0008-workqueue-change-cancel_work_sync-to-clear-work-data.patch
0009-acpi-use-queue_work_on-instead-of-binding-workqueue-.patch
0010-stop_machine-reimplement-without-using-workqueue.patch
0011-workqueue-misc-cosmetic-updates.patch
0012-workqueue-merge-feature-parameters-into-flags.patch
0013-workqueue-define-masks-for-work-flags-and-conditiona.patch
0014-workqueue-separate-out-process_one_work.patch
0015-workqueue-temporarily-disable-workqueue-tracing.patch
0016-workqueue-kill-cpu_populated_map.patch
0017-workqueue-update-cwq-alignement.patch
0018-workqueue-reimplement-workqueue-flushing-using-color.patch
0019-workqueue-introduce-worker.patch
0020-workqueue-reimplement-work-flushing-using-linked-wor.patch
0021-workqueue-implement-per-cwq-active-work-limit.patch
0022-workqueue-reimplement-workqueue-freeze-using-max_act.patch
0023-workqueue-introduce-global-cwq-and-unify-cwq-locks.patch
0024-workqueue-implement-worker-states.patch
0025-workqueue-reimplement-CPU-hotplugging-support-using-.patch
0026-workqueue-make-single-thread-workqueue-shared-worker.patch
0027-workqueue-add-find_worker_executing_work-and-track-c.patch
0028-workqueue-carry-cpu-number-in-work-data-once-executi.patch
0029-workqueue-implement-WQ_NON_REENTRANT.patch
0030-workqueue-use-shared-worklist-and-pool-all-workers-p.patch
0031-workqueue-implement-concurrency-managed-dynamic-work.patch
0032-workqueue-increase-max_active-of-keventd-and-kill-cu.patch
0033-workqueue-add-system_wq-system_long_wq-and-system_nr.patch
0034-workqueue-implement-DEBUGFS-workqueue.patch
0035-workqueue-implement-several-utility-APIs.patch
0036-libata-take-advantage-of-cmwq-and-remove-concurrency.patch
0037-async-use-workqueue-for-worker-pool.patch
0038-fscache-convert-object-to-use-workqueue-instead-of-s.patch
0039-fscache-convert-operation-to-use-workqueue-instead-o.patch
0040-fscache-drop-references-to-slow-work.patch
0041-cifs-use-workqueue-instead-of-slow-work.patch
0042-gfs2-use-workqueue-instead-of-slow-work.patch
0043-slow-work-kill-it.patch

diffstat.
arch/ia64/kernel/smpboot.c | 2
arch/x86/kernel/smpboot.c | 2
drivers/acpi/osl.c | 40
drivers/ata/libata-core.c | 20
drivers/ata/libata-eh.c | 4
drivers/ata/libata-scsi.c | 10
drivers/ata/libata-sff.c | 9
drivers/ata/libata.h | 1
include/linux/cpu.h | 2
include/linux/kthread.h | 1
include/linux/libata.h | 1
include/linux/workqueue.h | 146 +
kernel/async.c | 140 -
kernel/kthread.c | 15
kernel/power/process.c | 21
kernel/trace/Kconfig | 4
kernel/workqueue.c | 3313 +++++++++++++++++++++++++++++++++++++++------
kernel/workqueue_sched.h | 13
lib/Kconfig.debug | 7
19 files changed, 3128 insertions(+), 623 deletions(-)
Thanks.

--
tejun

[L] http://thread.gmane.org/gmane.linux.kernel/954759


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