linux-kernel - Re: [PATCHSET wq/for-3.10-tmp] workqueue: implement workqueue with custom worker attributes

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Message-ID: <513C61B9.5030004@cn.fujitsu.com>
Date:	Sun, 10 Mar 2013 18:34:33 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-kernel@...r.kernel.org, axboe@...nel.dk, jmoyer@...hat.com,
	zab@...hat.com
Subject: Re: [PATCHSET wq/for-3.10-tmp] workqueue: implement workqueue with
 custom worker attributes

On 02/03/13 11:23, Tejun Heo wrote:

Hi, Tejun,

I agree almost the whole design.(only except some locks)
And I found only a little problems for current review.

> 
> This patchset contains the following 31 patches.
> 
>  0001-workqueue-make-sanity-checks-less-punshing-using-WAR.patch

>  0002-workqueue-make-workqueue_lock-irq-safe.patch

workqueue_lock protects too many things. We can introduce different locks
for different purpose later.

>  0003-workqueue-introduce-kmem_cache-for-pool_workqueues.patch
>  0004-workqueue-add-workqueue_struct-pwqs-list.patch
>  0005-workqueue-replace-for_each_pwq_cpu-with-for_each_pwq.patch
>  0006-workqueue-introduce-for_each_pool.patch
>  0007-workqueue-restructure-pool-pool_workqueue-iterations.patch
>  0008-workqueue-add-wokrqueue_struct-maydays-list-to-repla.patch
>  0009-workqueue-consistently-use-int-for-cpu-variables.patch
>  0010-workqueue-remove-workqueue_struct-pool_wq.single.patch
>  0011-workqueue-replace-get_pwq-with-explicit-per_cpu_ptr-.patch
>  0012-workqueue-update-synchronization-rules-on-workqueue-.patch
>  0013-workqueue-update-synchronization-rules-on-worker_poo.patch

>  0014-workqueue-replace-POOL_MANAGING_WORKERS-flag-with-wo.patch
>  0015-workqueue-separate-out-init_worker_pool-from-init_wo.patch
>  0016-workqueue-introduce-workqueue_attrs.patch
>  0017-workqueue-implement-attribute-based-unbound-worker_p.patch
>  0018-workqueue-remove-unbound_std_worker_pools-and-relate.patch
>  0019-workqueue-drop-std-from-cpu_std_worker_pools-and-for.patch
>  0020-workqueue-add-pool-ID-to-the-names-of-unbound-kworke.patch
>  0021-workqueue-drop-WQ_RESCUER-and-test-workqueue-rescuer.patch
>  0022-workqueue-restructure-__alloc_workqueue_key.patch


>  0023-workqueue-implement-get-put_pwq.patch

I guess this patch and patch25 may have very deep issue VS RCU.

>  0024-workqueue-prepare-flush_workqueue-for-dynamic-creati.patch
>  0025-workqueue-perform-non-reentrancy-test-when-queueing-.patch
>  0026-workqueue-implement-apply_workqueue_attrs.patch
>  0027-workqueue-make-it-clear-that-WQ_DRAINING-is-an-inter.patch
>  0028-workqueue-reject-increasing-max_active-for-ordered-w.patch
>  0029-cpumask-implement-cpumask_parse.patch
>  0030-driver-base-implement-subsys_virtual_register.patch
>  0031-workqueue-implement-sysfs-interface-for-workqueues.patch
> 


for 1~13,15~22,26~28, please add Reviewed-by: Lai Jiangshan <laijs@...fujitsu.com>


> 0001-0003 are misc preps.
> 
> 0004-0008 update various iterators such that they don't operate on cpu
> number.
> 
> 0009-0011 are another set of misc preps / cleanups.
> 
> 0012-0014 update synchronization rules to prepare for dynamic
> management of pwqs and pools.
> 
> 0015-0022 introduce workqueue_attrs and prepare for dynamic management
> of pwqs and pools.
> 
> 0023-0026 implement dynamic application of workqueue_attrs which
> involes creating and destroying unbound pwqs and pools dynamically.
> 
> 0027-0028 prepare workqueue for sysfs exports.
> 
> 0029-0030 make cpumask and driver core changes for workqueue sysfs
> exports.
> 
> 0031 implements sysfs exports for workqueues.
> 
> This patchset is on top of
> 
> [1] wq/for-3.10-tmp 7bceeff75e ("workqueue: better define synchronization rule around rescuer->pool updates")
> 
> which is scheduled to be rebased on top of v3.9-rc1 once it comes out.
> The changes are also available in the following git branch.
> 
>  git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-attrs
> 
> diffstat follows.
> 
>  drivers/base/base.h         |    2 
>  drivers/base/bus.c          |   73 +
>  drivers/base/core.c         |    2 
>  include/linux/cpumask.h     |   15 
>  include/linux/device.h      |    2 
>  include/linux/workqueue.h   |   34 
>  kernel/workqueue.c          | 1716 +++++++++++++++++++++++++++++++-------------
>  kernel/workqueue_internal.h |    5 
>  8 files changed, 1322 insertions(+), 527 deletions(-)
> 
> Thanks.
> 
> --
> tejun
> 
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-3.10-tmp
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