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[Xen-devel] RE: [PATCH] Disable auto-balloon on ia64

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject: [Xen-devel] RE: [PATCH] Disable auto-balloon on ia64
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Mon, 22 May 2006 21:21:02 +0800
Cc: Charles Coffing <ccoffing@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxx>, xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-index: AcZ9g1zhQ6Y7eNo8ThWePtaGeyl5rAAHjVDg
Thread-topic: [PATCH] Disable auto-balloon on ia64
>From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx]
>Sent: 2006年5月22日 17:37
>On 22 May 2006, at 10:06, Tian, Kevin wrote:
>>      We just need to reverse the whole change for ia64, since both
>> and domVTI are insert a hole by this auto-balloon patch. Due to
>> missing balloon support on xen/ia64 as you said, both domU and
>> failed due to this change.
>The first patch that you work around seems okay to me. That is, it
>seems correct that we make initial reservation exclude
>headroom'. Shouldn't ia64 reserve extra memory as it needs it, as x86
>does,  rather than up front?

I have to admit that currently xen/ia64 hasn't enough sanity check 
about reserving extra memory, which should be changed once balloon 
feature is added. Then same policy whatever is applicable can be 
added to ia64. Now ia64 dom0 has been changed to vp model (p!=m) 
by Isaku, and thus balloon can be foreseeable soon.

In currently stage, we can just ensure ia64 working by ensuring all 
max_pages frames are allocated without empty holes.

>The second bit of your workaround, which applies to getDomainMemory:
>I'll wait and see if Charles has anything to say, but otherwise I'll
>remove the code that adds the extra slack entirely.
>  -- Keir

Yes, let's see whether Charles has other good reason for that change. :-)


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