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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 /include/trace | |
| parent | ext4: cache extent hole in extent status tree for ext4_da_map_blocks() (diff) | |
| download | linux-dev-edaa53cac8fd4b96ed4b8f96c4933158ff2dd337.tar.xz linux-dev-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 'include/trace')
| -rw-r--r-- | include/trace/events/ext4.h | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h index cd37a584ee88..6cfb841fea7c 100644 --- a/include/trace/events/ext4.h +++ b/include/trace/events/ext4.h @@ -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 */ |