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eb68d0e2fc
This commit adds some statictics in extent status tree shrinker. The
purpose to add these is that we want to collect more details when we
encounter a stall caused by extent status tree shrinker. Here we count
the following statictics:
stats:
the number of all objects on all extent status trees
the number of reclaimable objects on lru list
cache hits/misses
the last sorted interval
the number of inodes on lru list
average:
scan time for shrinking some objects
the number of shrunk objects
maximum:
the inode that has max nr. of objects on lru list
the maximum scan time for shrinking some objects
The output looks like below:
$ cat /proc/fs/ext4/sda1/es_shrinker_info
stats:
28228 objects
6341 reclaimable objects
5281/631 cache hits/misses
586 ms last sorted interval
250 inodes on lru list
average:
153 us scan time
128 shrunk objects
maximum:
255 inode (255 objects, 198 reclaimable)
125723 us max scan time
If the lru list has never been sorted, the following line will not be
printed:
586ms last sorted interval
If there is an empty lru list, the following lines also will not be
printed:
250 inodes on lru list
...
maximum:
255 inode (255 objects, 198 reclaimable)
0 us max scan time
Meanwhile in this commit a new trace point is defined to print some
details in __ext4_es_shrink().
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/*
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* fs/ext4/extents_status.h
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*
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* Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
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* Modified by
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* Allison Henderson <achender@linux.vnet.ibm.com>
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* Zheng Liu <wenqing.lz@taobao.com>
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*
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*/
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#ifndef _EXT4_EXTENTS_STATUS_H
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#define _EXT4_EXTENTS_STATUS_H
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/*
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* Turn on ES_DEBUG__ to get lots of info about extent status operations.
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*/
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#ifdef ES_DEBUG__
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#define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
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#else
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#define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
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#endif
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/*
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* With ES_AGGRESSIVE_TEST defined, the result of es caching will be
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* checked with old map_block's result.
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*/
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#define ES_AGGRESSIVE_TEST__
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/*
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* These flags live in the high bits of extent_status.es_pblk
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*/
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#define ES_SHIFT 60
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#define EXTENT_STATUS_WRITTEN (1 << 3)
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#define EXTENT_STATUS_UNWRITTEN (1 << 2)
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#define EXTENT_STATUS_DELAYED (1 << 1)
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#define EXTENT_STATUS_HOLE (1 << 0)
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#define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \
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EXTENT_STATUS_UNWRITTEN | \
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EXTENT_STATUS_DELAYED | \
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EXTENT_STATUS_HOLE)
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#define ES_WRITTEN (1ULL << 63)
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#define ES_UNWRITTEN (1ULL << 62)
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#define ES_DELAYED (1ULL << 61)
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#define ES_HOLE (1ULL << 60)
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#define ES_MASK (ES_WRITTEN | ES_UNWRITTEN | \
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ES_DELAYED | ES_HOLE)
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struct ext4_sb_info;
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struct ext4_extent;
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struct extent_status {
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struct rb_node rb_node;
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ext4_lblk_t es_lblk; /* first logical block extent covers */
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ext4_lblk_t es_len; /* length of extent in block */
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ext4_fsblk_t es_pblk; /* first physical block */
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};
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struct ext4_es_tree {
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struct rb_root root;
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struct extent_status *cache_es; /* recently accessed extent */
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};
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struct ext4_es_stats {
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unsigned long es_stats_last_sorted;
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unsigned long es_stats_shrunk;
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unsigned long es_stats_cache_hits;
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unsigned long es_stats_cache_misses;
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u64 es_stats_scan_time;
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u64 es_stats_max_scan_time;
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struct percpu_counter es_stats_all_cnt;
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struct percpu_counter es_stats_lru_cnt;
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};
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extern int __init ext4_init_es(void);
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extern void ext4_exit_es(void);
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extern void ext4_es_init_tree(struct ext4_es_tree *tree);
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extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
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ext4_lblk_t len, ext4_fsblk_t pblk,
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unsigned int status);
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extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
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ext4_lblk_t len, ext4_fsblk_t pblk,
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unsigned int status);
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extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
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ext4_lblk_t len);
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extern void ext4_es_find_delayed_extent_range(struct inode *inode,
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ext4_lblk_t lblk, ext4_lblk_t end,
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struct extent_status *es);
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extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
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struct extent_status *es);
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static inline int ext4_es_is_written(struct extent_status *es)
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{
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return (es->es_pblk & ES_WRITTEN) != 0;
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}
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static inline int ext4_es_is_unwritten(struct extent_status *es)
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{
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return (es->es_pblk & ES_UNWRITTEN) != 0;
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}
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static inline int ext4_es_is_delayed(struct extent_status *es)
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{
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return (es->es_pblk & ES_DELAYED) != 0;
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}
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static inline int ext4_es_is_hole(struct extent_status *es)
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{
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return (es->es_pblk & ES_HOLE) != 0;
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}
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static inline unsigned int ext4_es_status(struct extent_status *es)
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{
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return es->es_pblk >> ES_SHIFT;
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}
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static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
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{
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return es->es_pblk & ~ES_MASK;
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}
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static inline void ext4_es_store_pblock(struct extent_status *es,
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ext4_fsblk_t pb)
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{
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ext4_fsblk_t block;
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block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
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es->es_pblk = block;
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}
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static inline void ext4_es_store_status(struct extent_status *es,
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unsigned int status)
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{
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es->es_pblk = (((ext4_fsblk_t)
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(status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
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(es->es_pblk & ~ES_MASK));
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}
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static inline void ext4_es_store_pblock_status(struct extent_status *es,
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ext4_fsblk_t pb,
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unsigned int status)
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{
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es->es_pblk = (((ext4_fsblk_t)
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(status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
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(pb & ~ES_MASK));
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}
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extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
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extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
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extern void ext4_es_lru_add(struct inode *inode);
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extern void ext4_es_lru_del(struct inode *inode);
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#endif /* _EXT4_EXTENTS_STATUS_H */
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