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| author | Zheng Liu | 2014-11-25 17:45:37 +0100 |
|---|---|---|
| committer | Theodore Ts'o | 2014-11-25 17:45:37 +0100 |
| commit | edaa53cac8fd4b96ed4b8f96c4933158ff2dd337 (patch) | |
| tree | f414417ca79fe9678743ea5af75bd5afb70ad8cd /fs/ext4/extents_status.h | |
| parent | ext4: cache extent hole in extent status tree for ext4_da_map_blocks() (diff) | |
| download | kernel-qcow2-linux-edaa53cac8fd4b96ed4b8f96c4933158ff2dd337.tar.gz kernel-qcow2-linux-edaa53cac8fd4b96ed4b8f96c4933158ff2dd337.tar.xz kernel-qcow2-linux-edaa53cac8fd4b96ed4b8f96c4933158ff2dd337.zip | |
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>
Diffstat (limited to 'fs/ext4/extents_status.h')
| -rw-r--r-- | fs/ext4/extents_status.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h index efd5f970b501..0e6a33e81e5f 100644 --- a/fs/ext4/extents_status.h +++ b/fs/ext4/extents_status.h @@ -65,14 +65,13 @@ struct ext4_es_tree { }; struct ext4_es_stats { - unsigned long es_stats_last_sorted; unsigned long es_stats_shrunk; unsigned long es_stats_cache_hits; unsigned long es_stats_cache_misses; u64 es_stats_scan_time; u64 es_stats_max_scan_time; struct percpu_counter es_stats_all_cnt; - struct percpu_counter es_stats_lru_cnt; + struct percpu_counter es_stats_shk_cnt; }; extern int __init ext4_init_es(void); @@ -151,7 +150,7 @@ static inline void ext4_es_store_pblock_status(struct extent_status *es, extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi); extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi); -extern void ext4_es_lru_add(struct inode *inode); -extern void ext4_es_lru_del(struct inode *inode); +extern void ext4_es_list_add(struct inode *inode); +extern void ext4_es_list_del(struct inode *inode); #endif /* _EXT4_EXTENTS_STATUS_H */ |