>So this is impossible without THP swapin. While 2M swapout makes a lot of
>sense, I doubt 2M swapin is really useful. What kind of application is 
>to do sequential memory access?

We waste a lot of cpu cycles to re-compact 4K pages back to a large page
under THP.  Swapping it back in as a single large page can avoid
fragmentation and this overhead.



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