linux-kernel - Re: [kvm-devel] [GIT PULL][RESEND] KVM cpu hotplug fixes

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Message-ID: <46611D2B.1060004@qumranet.com>
Date:	Sat, 02 Jun 2007 10:32:59 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Jun Koi <junkoi2004@...il.com>
CC:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [GIT PULL][RESEND] KVM cpu hotplug fixes

Jun Koi wrote:
> Hi Avi,
>
> On 6/2/07, Avi Kivity <avi@...ranet.com> wrote:
>> Linus Torvalds wrote:
>> > Don't send me pull requests like this. And absolutely do NOT send
>> them as
>> > resends. I just  get grumpy.
>> >
>> > If all the added code had been KVM-only, I might not care. But when
>> the
>> > bulk of the code touches core files, you had better explain why
>> this is so
>> > important that it cannot wait for the next merge window.
>>
>> Ok.  This was really wanted by laptop-carrying users, but I guess
>> they'll have to wait for 2.6.23.
>>
>
> Could you explain a bit:
>
> 1) Why CPU hotplug is that important for virtualization?
>

It's not specifically important for virtualization.  It's a Linux kernel
feature, and right now it doesn't work very well when kvm is enabled,
and that should be fixed.


> 2) Why this patch is wanted by laptop users?

CPU hotplug is used by suspend/resume (basically, suspend hot-unplugs
all cpus except one an then suspends the machine.  Resume hotplugs the
cpus back after restarting the devices).

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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