Re: [PATCH v11 07/14] HMM: mm add helper to update page table when migrating memory v2.

[Hillf Danton]

> 
> This is a multi-stage process, first we save and replace page table
> entry with special HMM entry, also flushing tlb in the process. If
> we run into non allocated entry we either use the zero page or we
> allocate new page. For swaped entry we try to swap them in.
> 
Please elaborate why swap entry is handled this way.


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