linux-kernel - Re: [PATCH 12/16] rtmutex: turn the plist into an rb-tree.

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Message-ID: <1335170023.28150.97.camel@twins>
Date:	Mon, 23 Apr 2012 10:33:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Juri Lelli <juri.lelli@...il.com>, tglx@...utronix.de,
	mingo@...hat.com, oleg@...hat.com, fweisbec@...il.com,
	darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...csson.com, liming.wang@...driver.com
Subject: Re: [PATCH 12/16] rtmutex: turn the plist into an rb-tree.

On Wed, 2012-04-11 at 17:11 -0400, Steven Rostedt wrote:
> 
> I have to ask. Why not just add a rbtree with a plist? That is, add all
> deadline tasks to the rbtree and all others to the plist. As plist has a
> O(1) operation, and rbtree does not. We are making all RT tasks suffer
> the overhead of the rbtree.

You always love to add complexity to stuff before making it work, don't
you ;-)

I'm not quite convinced the plist stuff is _that_ much faster, anyway,
its all a stop-gap measure until we can do proper BWI which would wipe
all this code anyway.
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