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[Xen-ia64-devel] Re: [Xen-devel] RE: [Patch] Fix IDLE issue with sedf sc

To: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>
Subject: [Xen-ia64-devel] Re: [Xen-devel] RE: [Patch] Fix IDLE issue with sedf scheduler on IA64
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Thu, 14 Jul 2005 16:10:23 +0100
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Hollis Blanchard <hollisb@xxxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
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On 14 Jul 2005, at 15:48, Magenheimer, Dan (HP Labs Fort Collins) wrote:

So... an idle domain is a convenient abstraction which, it seems,
results in every platform inconveniently adding code to work around
the abstraction? ;-)

Isn't it really the case that an idle domain/process is an anachronistic
concept that pre-dates "low power states" and is used by Xen mostly
because Xen is leveraging OS scheduler designs (that also pre-date
low power states)?  I recognize that that's still a perfectly
reasonable design choice for Xen... just trying to ensure I
understand.

I think that what you execute during idle time, and what state you save/restore, is orthogonal to how you represent the idle state to the scheduler and other subsystems in the hypervisor.

 -- Keir


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