linux-kernel - Work queue questions

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Message-ID: <CAHCeSFpar4ykz5cr9dLrO5J4r3ZXkwbNkU1O3q=QZs9rFEyB6w@mail.gmail.com>
Date:	Fri, 21 Sep 2012 18:35:25 +0100
From:	Dinky Verma <dverma249@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Work queue questions

Hi,

I have one question regarding concurrency managed workqueue. In the
previous kernel versions, I was using
create_singlethread_workqueue("driver_wq") e.g workqueue name is
driver_wq. In my device driver with the latest kernel version, I am
doing the same to have a support in my device driver for previous
kernel versions and new kernel version, I started using
alloc_workqueue (in intention to create single threaded workqueue)
e.g.

wq = alloc_workqueue("driver_wq", WQ_UNBOUND,1);

create_singlethread_workqueue (Depricated) and alloc_workqueue creates
work queue both work on the newer kernel versions.

I have created 3 single threaded workqueues. when I do ps on linux
console, I see the workqueue thread with process id. When I am queuing
the work simultaneously on these worker threads, I found that threads
named with Kworker/X.Y will process the work from the work queue not
the one that had been created create_singlethread_workqueue.

When I schedule the three works at the same time, I saw sometimes one
Kworker/X.Y thread processes all work items.

The question is why the main worker thread that I created does not
process the work that is intended for it why instead kworker will
process it? I have queued the work using queue_work(wq,
worker_struct).

Regards,
Deepa
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