[PATCH 0/2] Avoid unnecessary page locks in the generic read path v2r1

From: Mel Gorman
Date: Tue Jan 26 2016 - 09:10:01 EST

Changelog since V1
o Use lock_page_killable consistently do_generic_file_read (jan)

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(-)