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| author | Zheng Liu <wenqing.lz@taobao.com> | 2014-11-25 11:45:37 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-11-25 11:45:37 -0500 |
| commit | edaa53cac8fd4b96ed4b8f96c4933158ff2dd337 (patch) | |
| tree | f414417ca79fe9678743ea5af75bd5afb70ad8cd /fs/ext4/ext4.h | |
| parent | 2f8e0a7c6c89f850ebd5d6c0b9a08317030d1b89 (diff) | |
| download | op-kernel-dev-edaa53cac8fd4b96ed4b8f96c4933158ff2dd337.zip op-kernel-dev-edaa53cac8fd4b96ed4b8f96c4933158ff2dd337.tar.gz | |
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/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 98da4cd..ab6caf5 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -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; |
