From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Tejun Heo <tj@kernel.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 11/12] workqueue: add WQ_CPU_INTENSIVE to system_long_wq
Date: Fri, 28 Sep 2012 16:06:48 +0800 [thread overview]
Message-ID: <50655A98.3090507@cn.fujitsu.com> (raw)
In-Reply-To: <20120926183833.GI12544@google.com>
Hi, Tejun
On 09/27/2012 02:38 AM, Tejun Heo wrote:
> On Thu, Sep 27, 2012 at 01:20:42AM +0800, Lai Jiangshan wrote:
>> works in system_long_wq will be running long.
>> add WQ_CPU_INTENSIVE to system_long_wq to avoid these kinds of works occupy
>> the running wokers which delay the normal works.
>>
>> if system_long_wq is designed for only sleep-long works, not running-long works,
>> this patch makes no sense.
>
> There "long" doesn't mean it's gonna consume a lot of CPU cycles, so
> it should contribute to concurrency management. The plan is to remove
> system_long_wq once we got rid of flushing of system_wq via
> flush_scheduled_work() and directly through flush_workqueue(). I
> think we're pretty close, so let's not add more usage of it.
>
OK.
But does we need a stand-alone workqueue for work_on_cpu() as it is original
introduced? (2d3854a3)
Thanks,
Lai
next prev parent reply other threads:[~2012-09-28 8:04 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-26 17:20 [PATCH 00/12] workqueue: simple cleanups Lai Jiangshan
2012-09-26 17:20 ` [PATCH 01/12] workqueue: add WORKER_RESCUER Lai Jiangshan
2012-09-26 18:07 ` Tejun Heo
2012-09-28 10:11 ` Lai Jiangshan
2012-09-26 17:20 ` [PATCH 02/12] workqueue: disallow set_cpus_allowed_ptr() from work item Lai Jiangshan
2012-09-26 18:12 ` Tejun Heo
2012-09-26 17:20 ` [PATCH 03/12] workqueue: remove WORKER_PREP from rescuer Lai Jiangshan
2012-09-26 18:24 ` Tejun Heo
2012-09-28 10:04 ` Lai Jiangshan
2012-09-30 7:39 ` Tejun Heo
2012-09-26 17:20 ` [PATCH 04/12] workqueue: simplify is_chained_work() Lai Jiangshan
2012-09-26 18:28 ` Tejun Heo
2012-09-28 9:52 ` Lai Jiangshan
2012-09-30 7:32 ` Tejun Heo
2012-09-26 17:20 ` [PATCH 05/12] workqueue: don't wake up other workers in rescuer Lai Jiangshan
2012-09-26 18:34 ` Tejun Heo
2012-09-28 10:18 ` Lai Jiangshan
2012-09-26 17:20 ` [PATCH 06/12] workqueue: destroy_worker() can only destory idle worker not just created worker Lai Jiangshan
2012-09-26 18:35 ` Tejun Heo
2012-09-26 17:20 ` [PATCH 07/12] workqueue: remove WORKER_STARTED Lai Jiangshan
2012-09-26 18:36 ` Tejun Heo
2012-09-28 9:52 ` Lai Jiangshan
2012-09-26 17:20 ` [PATCH 08/12] workqueue: fix comments of insert_work() Lai Jiangshan
2012-09-26 17:20 ` [PATCH 09/12] workqueue: declare system_highpri_wq Lai Jiangshan
2012-09-26 17:20 ` [PATCH 10/12] cpu-hotplug.txt: fix comments of work_on_cpu() Lai Jiangshan
2012-09-26 17:20 ` [RFC PATCH 11/12] workqueue: add WQ_CPU_INTENSIVE to system_long_wq Lai Jiangshan
2012-09-26 18:38 ` Tejun Heo
2012-09-28 8:06 ` Lai Jiangshan [this message]
2012-09-30 7:22 ` Tejun Heo
2012-09-26 17:20 ` [PATCH 12/12] workqueue: avoid work_on_cpu() to interfere system_wq Lai Jiangshan
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