Re: [Xen-devel] [PATCH 1/1] Xen ARINC 653 Scheduler (updated to

To:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH 1/1] Xen ARINC 653 Scheduler (updated to add support for CPU pools)
From:	Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
Date:	Thu, 17 Jun 2010 07:02:28 +0200
Cc:	George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Kathy Hadley <Kathy.Hadley@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date:	Wed, 16 Jun 2010 22:03:22 -0700
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On 06/16/2010 06:20 PM, Keir Fraser wrote:

On 16/06/2010 17:14, "George Dunlap"<George.Dunlap@xxxxxxxxxxxxx>  wrote:

  I actually tried the xmalloc() method first.  I found that when the
.adjust_global function was called, the address of the "ops" data structure
passed to that function was different from the address of the "ops" data
structure when the .init function was called.  I wanted to use .adjust_global
to modify the data structure that was created when the .init function was
called, but I could not figure out a way to get the address of the second
data structure.  Suggestions?


It's been a month or two since I trawled through the cpupools code;
but I seem to recall that .init is called twice -- once for the
"default pool" (cpupool0), and once for an actually in-use pool.
(Juergen, can you correct me if I'm wrong?)  Is it possible that
that's the difference in the pointers that you're seeing?


Oh yes, that was the old behaviour. I took a hatchet to the
scheduler/cpupool interfaces a few weeks ago and now we should only
initialise the scheduler once, unless extra cpupools are manually created.


Keir, what do you think about creating an "idle-scheduler" for the cpus not in
any cpupool? It would only schedule the idle vcpu and could be VERY minimal.
This could reduce the complexity of moving cpus from and to cpupools.

I could try to setup a patch if you support this idea (I'm asking for your
opinion before starting this, as I'm rather busy with other tasks).


Juergen

P.S.: George, you still seem to use my old mail address which isn't valid any
      more...

--
Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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Re: [Xen-devel] [PATCH 1/1] Xen ARINC 653 Scheduler (updated to add supp