linux-kernel - [PATCH 0/2] Avoid unnecessary page locks in the generic read path

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Message-Id: <1453716204-20409-1-git-send-email-mgorman@techsingularity.net>
Date:	Mon, 25 Jan 2016 10:03:22 +0000
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 0/2] Avoid unnecessary page locks in the generic read path

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