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Re: [Xen-devel] Cpupools and pdata_alloc

To: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Cpupools and pdata_alloc
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 11 May 2010 19:55:30 +0100
Cc: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 11/05/2010 19:52, "George Dunlap" <George.Dunlap@xxxxxxxxxxxxx> wrote:

> On Tue, May 11, 2010 at 1:41 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
> wrote:
>> Well, once secondary CPUs are fully up they are of course running their
>> respective idle VCPUs, so we can't call schedule_init() very late. The right
>> thing to do is dynamically allocate state as CPUs are brought online -- and
>> potentially free that state when CPUs are taken offline. Which is pretty
>> much the direction the code points in already.
> Except that it's done a little indirectly, via initializing the idle
> vcpu, rather than calling something like sched_init_pcpu() when the
> cpu is brought up before creating an idle vcpu for it. :-)  Anyway,
> maybe once I get the credit2 stuff working again, I may think about
> writing a patch to clean it up a bit... mostly so that it's easier to
> follow what's going on.

Splitting it into an explicit separate call into the scheduling subsystem
would be acceptable, I think.

 -- Keir

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