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authorVlastimil Babka <vbabka@suse.cz>2013-09-11 14:22:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:58:00 -0700
commit7225522bb429a2f7dae6667e533e2d735b4882d0 (patch)
treebea75219dc36159322ddcd6de8dc4a4d5e1f6c79 /scripts/coccicheck
parent586a32ac1d33ce7a7548a27e4087e98842c3a06f (diff)
mm: munlock: batch non-THP page isolation and munlock+putback using pagevec
Currently, munlock_vma_range() calls munlock_vma_page on each page in a loop, which results in repeated taking and releasing of the lru_lock spinlock for isolating pages one by one. This patch batches the munlock operations using an on-stack pagevec, so that isolation is done under single lru_lock. For THP pages, the old behavior is preserved as they might be split while putting them into the pagevec. After this patch, a 9% speedup was measured for munlocking a 56GB large memory area with THP disabled. A new function __munlock_pagevec() is introduced that takes a pagevec and: 1) It clears PageMlocked and isolates all pages under lru_lock. Zone page stats can be also updated using the variant which assumes disabled interrupts. 2) It finishes the munlock and lru putback on all pages under their lock_page. Note that previously, lock_page covered also the PageMlocked clearing and page isolation, but it is not needed for those operations. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Jörn Engel <joern@logfs.org> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Michel Lespinasse <walken@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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