linux-kernel - Re: [RFC/PATCH 2/3] rt: PI-workqueue support

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Date:	Mon, 22 Oct 2007 08:33:31 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gregory Haskins <ghaskins@...ell.com>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: [RFC/PATCH 2/3] rt: PI-workqueue support

On Mon, 2007-10-22 at 14:15 +0200, Peter Zijlstra wrote:

> Daniel wrote this bit, but I tend to agree with him, but can't give his
> rationale. Mine is that worklets are typically asynchonous and thus its
> prio should not depend on temporal things like boosting.
> 
> OTOH it would probably make sense to allow it to depend on it through
> the barrier constructs, but for that I have to hook the completions into
> the PI chain. Something that needs more thought.

Yeah, I think Peter summarized it .. Since the task isn't waiting on
work when it's inserted it didn't seem right to use a priority that may
be boosted, since the work isn't preventing completion .. I think the
only time you would want to transfer the boosted priority is when a task
gets blocked, which does happen when you flush the workqueue.

Although, If there is one area of this code that needs attention I think
it's the PI stuff, it wasn't my first priority at the time .. I also
recall Oleg find some issue with it ..

Daniel

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