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SubjectRe: [RFC][Patch v8 0/7] KVM: Guest Free Page Hinting

On 2/15/19 4:05 AM, Wang, Wei W wrote:
> On Thursday, February 14, 2019 5:43 PM, David Hildenbrand wrote:
>> Yes indeed, that is the important bit. They must not be put pack to the
>> buddy before they have been processed by the hypervisor. But as the pages
>> are not in the buddy, no one allocating a page will stumble over such a page
>> and try to allocate it. Threads trying to allocate memory will simply pick
>> another buddy page instead of "busy waiting" for that page to be finished
>> reporting.
> What if a guest thread try to allocate some pages but the buddy cannot satisfy
> because all the pages are isolated? Would it be the same case that the guest thread
> gets blocked by waiting all the isolated pages to get madvised by the host and
> returned to the guest buddy, or even worse, some guest threads get killed due to oom?

If you are referring to a situation when guest is under memory pressure
then isolation request will fail and memory will not be
reported/isolated. However, there can always be a corner case and we can
definitely take that into consideration later.

> Best,
> Wei

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