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mm: accelerate munlock() treatment of THP pages
munlock_vma_pages_range() was always incrementing addresses by PAGE_SIZE at a time. When munlocking THP pages (or the huge zero page), this resulted in taking the mm->page_table_lock 512 times in a row. We can do better by making use of the page_mask returned by follow_page_mask (for the huge zero page case), or the size of the page munlock_vma_page() operated on (for the true THP page case). Signed-off-by: Michel Lespinasse <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Hugh Dickins <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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