From: Zheng Liu <wenqing.lz@taobao.com>
Date: Tue, 25 Nov 2014 16:45:37 +0000 (-0500)
Subject: ext4: change LRU to round-robin in extent status tree shrinker
X-Git-Tag: omap-for-v3.19/fixes-rc1~116^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=edaa53cac8fd4b96ed4b8f96c4933158ff2dd337;p=pandora-kernel.git

ext4: change LRU to round-robin in extent status tree shrinker

In this commit we discard the lru algorithm for inodes with extent
status tree because it takes significant effort to maintain a lru list
in extent status tree shrinker and the shrinker can take a long time to
scan this lru list in order to reclaim some objects.

We replace the lru ordering with a simple round-robin.  After that we
never need to keep a lru list.  That means that the list needn't be
sorted if the shrinker can not reclaim any objects in the first round.

Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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