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    SubjectRe: [PATCH] proc: pagemap: Hold mmap_sem during page walk
    > So there is a very real reason for that pattern existing. It's just that 
    > that reason has nothing to do with locking the thing into the page tables.
    > That is absolutely NOT guaranteed by the get_user_pages() physical page
    > pinning (munmap() is an extreme example of this, but I think swapout will
    > clear it too in try_to_unmap_one().

    Right. To increment page->count only affect vmscan to prevent free page.
    Not prevent pageout I/O nor page unmapping from a process.


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