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authorVlastimil Babka <vbabka@suse.cz>2013-09-11 23:22:33 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-12 00:58:00 +0200
commit5b40998ae35cf64561868370e6c9f3d3e94b6bf7 (patch)
tree24f7142d850df3512392004501fc9db7573fc031 /Kbuild
parentmm: munlock: bypass per-cpu pvec for putback_lru_page (diff)
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mm: munlock: remove redundant get_page/put_page pair on the fast path
The performance of the fast path in munlock_vma_range() can be further improved by avoiding atomic ops of a redundant get_page()/put_page() pair. When calling get_page() during page isolation, we already have the pin from follow_page_mask(). This pin will be then returned by __pagevec_lru_add(), after which we do not reference the pages anymore. After this patch, an 8% speedup was measured for munlocking a 56GB large memory area with THP disabled. 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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