Subject: Re: Overview of concurrency managed workqueue
From: Daniel Walker <dwalker@codeaurora.org>
To: Tejun Heo <tj@kernel.org>
Cc: mingo@elte.hu, awalls@radix.net, linux-kernel@vger.kernel.org,
       jeff@garzik.org, akpm@linux-foundation.org, rusty@rustcorp.com.au,
       cl@linux-foundation.org, dhowells@redhat.com, arjan@linux.intel.com,
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Date: Thu, 17 Jun 2010 15:28:53 -0700
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On Wed, 2010-06-16 at 15:45 +0200, Tejun Heo wrote:
> On 06/16/2010 03:41 PM, Daniel Walker wrote:
> > Any workqueue that has a thread which can be prioritized from userspace.
> > As long as there is a thread it can usually be given a priority from
> > userspace, so any _current_ workqueue which uses a single thread or
> > multiple threads is an example of what I'm talking about.
> 
> Eh... what's the use case for that?  That's just so wrong.  What do
> you do after a suspend/resume cycle?  Reprioritize all of them from
> suspend/resume hooks?


I tested your assertion about suspend/resume, and it doesn't seem to be
true.. I tested workqueues with nice levels, and real time priorities on
a random laptop using 2.6.31 both held their priorities across suspend
to RAM and suspend to disk .. Was this change added after 2.6.31 ?

Daniel

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