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authorMichel Lespinasse <walken@google.com>2013-02-28 02:02:44 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-28 04:10:09 +0100
commitff6a6da60b894d008f704fbeb5bc596f9994b16e (patch)
tree84c0fd2850edcd836afee8f9c542d4d4d98602f4 /Documentation/frv
parentbacklight: add new lp8788 backlight driver (diff)
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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 <walken@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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