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SubjectRe: [RFC][PATCH] nameing reserved pages [0/3]
Arjan van de Ven wrote:

>On Wed, 2005-04-20 at 23:15 +0900, Kamezawa Hiroyuki wrote:
>
>
>MCA's probably shouldn't set PG_reserved; I don't see why they should.
>They could just steal the page and "leak" it.
>
>
Actually leaked pages cannot be hot-removed/replaced. So we have to
trace which pages is removed by MCA.
I think Set PG_reserved and set page->private = Removed_by_MCA is a
simple idea.

>>>/dev/memstate really looks like a bad idea to me as well... I rather
>>>have less than more /dev/*mem*
>>>
>>>
>>>
>>>
>>For showing page usage and its "location", I've thought of other
>>interface, sysfs, procfs...
>>But I have no idea.
>>
>>
>
>Why do you want this exported to userspace? There is absolutely no way
>you can get this exported race free without shutting the VM down, and
>without being race free this information has absolutely no meaning !!
>
>
No meaning ?
Before memory-hotremove, we can guessing whether memory is hot-removable
or not.
As you say , this is not atomic and not fully responsible.

After failing memory-hotremove, detecting why hot-remove was failed is
very important.
I think ,when memory hot-remove faild, memory area is isolated until it
is pushed back by an operator.
We can get a real snapshot of specified memory area.

Regards,
-- Kame

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