linux-kernel - Re: Overview of concurrency managed workqueue

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Message-ID: <4C191885.9080303@s5r6.in-berlin.de>
Date:	Wed, 16 Jun 2010 20:31:33 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Daniel Walker <dwalker@...eaurora.org>
CC:	Tejun Heo <tj@...nel.org>, mingo@...e.hu, awalls@...ix.net,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, dhowells@...hat.com,
	arjan@...ux.intel.com, johannes@...solutions.net, oleg@...hat.com,
	axboe@...nel.dk
Subject: Re: Overview of concurrency managed workqueue

Daniel Walker wrote:
[tweak scheduling priority of a worker thread]
> Let say I have a high priority
> thread in userspace , and I discover through analysis that my thread is
> being forced to wait on a workqueue thread (priority inversion) , so
> then I just increase the workqueue thread priority to overcome the
> inversion. That's totally valid, and you don't even need to know exactly
> what the thread is doing..

I suspect the _actual_ problem to solve here is not that of proper
scheduling priorities but that of having to meet deadlines.
-- 
Stefan Richter
-=====-==-=- -==- =----
http://arcgraph.de/sr/
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