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SubjectRe: [RFC PATCH v11 10/29] mm: Add AS_UNMOVABLE to mark mapping as completely unmovable
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On 7/28/23 18:02, Vlastimil Babka wrote:
>> There's even a comment to that effect later on in the function:
> Hmm, well spotted. But it wouldn't be so great if we now had to lock every
> inspected page (and not just dirty pages), just to check the AS_ bit.
>
> But I wonder if this is leftover from previous versions. Are the guest pages
> even PageLRU currently? (and should they be, given how they can't be swapped
> out or anything?) If not, isolate_migratepages_block will skip them anyway.

No, they're not (migration or even swap-out is not excluded for the
future, but for now it's left for future work.

Paolo

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