A long time ago there was an attempt to merge a patch that reduced the
cost of unlock_page by avoiding the page_waitqueue lookup if there were no
waiters. It was rejected on the grounds of complexity but it was pointed
out that the read paths call lock_page unnecessarily. This series reduces
the number of calls to lock_page when multiple processes read data in at
the same time.

 mm/filemap.c | 90 ++++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 60 insertions(+), 30 deletions(-)

-- 
2.6.4

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