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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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10
fs/ext4/ext4.h
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@@ -878,10 +878,9 @@ struct ext4_inode_info {
/* extents status tree */
struct ext4_es_tree i_es_tree;
rwlock_t i_es_lock;
struct list_head i_es_lru;
struct list_head i_es_list;
unsigned int i_es_all_nr; /* protected by i_es_lock */
unsigned int i_es_lru_nr; /* protected by i_es_lock */
unsigned long i_touch_when; /* jiffies of last accessing */
unsigned int i_es_shk_nr; /* protected by i_es_lock */
/* ialloc */
ext4_group_t i_last_alloc_group;
@@ -1322,10 +1321,11 @@ struct ext4_sb_info {
/* Reclaim extents from extent status tree */
struct shrinker s_es_shrinker;
struct list_head s_es_lru;
struct list_head s_es_list;
long s_es_nr_inode;
struct ext4_es_stats s_es_stats;
struct mb_cache *s_mb_cache;
spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
spinlock_t s_es_lock ____cacheline_aligned_in_smp;
/* Ratelimit ext4 messages. */
struct ratelimit_state s_err_ratelimit_state;