From: Keir Fraser <keir.xen@gmail.com>
To: Juergen Gross <juergen.gross@ts.fujitsu.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: [PATCH] Allow ACPI state change with active cpupools
Date: Tue, 20 Mar 2012 14:55:53 +0000 [thread overview]
Message-ID: <CB8E4AF9.2ECDC%keir.xen@gmail.com> (raw)
In-Reply-To: <4F689847.1020709@ts.fujitsu.com>
On 20/03/2012 14:46, "Juergen Gross" <juergen.gross@ts.fujitsu.com> wrote:
>> Is it better to have cpupools know about offlining/suspend, or have
>> offlining/suspend know about cpupools? I would have thought the latter makes
>> more sense since it is offlining/suspend which calls into the cpupool
>> subsystem.
>
> I thought of a more relaxed solution in the cpupool coding:
>
> Instead of allowing to offline a cpu only if it is in Pool-0, I would allow it
> if:
> - the cpu is not the last one in the cpupool
> - or no domain is active in the cpupool (this would include the suspend case,
> where all domains are paused)
>
> Together with your proposal to remember the cpupool for an offlined cpu to add
> it again when it is onlined the handling should be rather simple and local.
Ah, I see. Yes, a more flexible policy like this in the cpupool subsystem is
best solution of all, imo.
-- Keir
next prev parent reply other threads:[~2012-03-20 14:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-20 12:15 [PATCH] Allow ACPI state change with active cpupools Juergen Gross
2012-03-20 12:52 ` Keir Fraser
2012-03-20 13:35 ` Juergen Gross
2012-03-20 14:30 ` Keir Fraser
2012-03-20 14:46 ` Juergen Gross
2012-03-20 14:55 ` Keir Fraser [this message]
2012-03-21 13:46 ` Juergen Gross
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