linux-kernel - Re: RFC for a new Scheduling policy/class in the Linux-kernel

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Date:	Thu, 16 Jul 2009 08:59:15 -0400
From:	"James H. Anderson" <anderson@...unc.edu>
To:	Raistlin <raistlin@...ux.it>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ted Baker <baker@...fsu.edu>,
	Chris Friesen <cfriesen@...tel.com>,
	Noah Watkins <jayhawk@....ucsc.edu>,
	Douglas Niehaus <niehaus@...c.ku.edu>,
	Henrik Austad <henrik@...tad.us>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Bill Huey <billh@...ppy.monkey.org>,
	Linux RT <linux-rt-users@...r.kernel.org>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dhaval Giani <dhaval.giani@...il.com>,
	KUSP Google Group <kusp@...glegroups.com>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Giuseppe Lipari <lipari@...is.sssup.it>,
	"Bjoern B. Brandenburg" <bbb@...il.unc.edu>
Subject: Re: RFC for a new Scheduling policy/class in the Linux-kernel



Raistlin wrote:
> Also, I'm not sure I can find in the FMLP paper information about the
> possibility of a task to suspend itself (e.g., I/O completion) while
> holding a short lock... I assume this is not recommended, but may be
> wrong, and, in that case, I hope Prof. Anderson and Bjorn will excuse
> and correct me. :-)
>
>   
This is a really excellent point and something I probably should have 
mentioned.  We developed the FMLP strictly for real-time (only) 
workloads.  We were specifically looking at protecting memory-resident 
resources (not I/O).  The FMLP would have to be significantly extended 
to work in settings where these assumptions don't hold.

Thanks for pointing this out.

-Jim
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