ext4: correct the cache_nr in tracepoint ext4_es_shrink_exit
The cache_cnt parameter of tracepoint ext4_es_shrink_exit means the
remaining cache count after shrink, but now it is the cache count before
shrink, fix it by read sbi->s_extent_cache_cnt again.
Fixes: 1ab6c4997e
("fs: convert fs shrinkers to new scan/count API")
Cc: stable@vger.kernel.org # 3.12+
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210522103045.690103-3-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -1576,6 +1576,7 @@ static unsigned long ext4_es_scan(struct shrinker *shrink,
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nr_shrunk = __es_shrink(sbi, nr_to_scan, NULL);
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ret = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt);
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trace_ext4_es_shrink_scan_exit(sbi->s_sb, nr_shrunk, ret);
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return nr_shrunk;
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}
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