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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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11
include/trace/events/ext4.h
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@@ -2450,15 +2450,14 @@ TRACE_EVENT(ext4_collapse_range,
TRACE_EVENT(ext4_es_shrink,
TP_PROTO(struct super_block *sb, int nr_shrunk, u64 scan_time,
int skip_precached, int nr_skipped, int retried),
int nr_skipped, int retried),
TP_ARGS(sb, nr_shrunk, scan_time, skip_precached, nr_skipped, retried),
TP_ARGS(sb, nr_shrunk, scan_time, nr_skipped, retried),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( int, nr_shrunk )
__field( unsigned long long, scan_time )
__field( int, skip_precached )
__field( int, nr_skipped )
__field( int, retried )
),
@@ -2467,16 +2466,14 @@ TRACE_EVENT(ext4_es_shrink,
__entry->dev = sb->s_dev;
__entry->nr_shrunk = nr_shrunk;
__entry->scan_time = div_u64(scan_time, 1000);
__entry->skip_precached = skip_precached;
__entry->nr_skipped = nr_skipped;
__entry->retried = retried;
),
TP_printk("dev %d,%d nr_shrunk %d, scan_time %llu skip_precached %d "
TP_printk("dev %d,%d nr_shrunk %d, scan_time %llu "
"nr_skipped %d retried %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->nr_shrunk,
__entry->scan_time, __entry->skip_precached,
__entry->nr_skipped, __entry->retried)
__entry->scan_time, __entry->nr_skipped, __entry->retried)
);
#endif /* _TRACE_EXT4_H */