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

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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>
This commit is contained in:
Zheng Liu
2014-11-25 11:45:37 -05:00
committed by Theodore Ts'o
parent 2f8e0a7c6c
commit edaa53cac8
8 changed files with 119 additions and 154 deletions
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4
fs/ext4/ioctl.c
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@@ -78,8 +78,8 @@ static void swap_inode_data(struct inode *inode1, struct inode *inode2)
memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
ext4_es_lru_del(inode1);
ext4_es_lru_del(inode2);
ext4_es_list_del(inode1);
ext4_es_list_del(inode2);
isize = i_size_read(inode1);
i_size_write(inode1, i_size_read(inode2));