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bcache: add reclaimed_journal_buckets to struct cache_set 

Now we have counters for how many times jouranl is reclaimed, how many
times cached dirty btree nodes are flushed, but we don't know how many
jouranl buckets are really reclaimed.

This patch adds reclaimed_journal_buckets into struct cache_set, this
is an increasing only counter, to tell how many journal buckets are
reclaimed since cache set runs. From all these three counters (reclaim,
reclaimed_journal_buckets, flush_write), we can have idea how well
current journal space reclaim code works.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2019-06-28 20:00:00 +08:00 committed by Jens Axboe
parent 91be66e131
commit dff90d58a1
3 changed files with 7 additions and 0 deletions
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1
drivers/md/bcache/bcache.h
View File

@ -705,6 +705,7 @@ struct cache_set {
atomic_long_t writeback_keys_failed;
atomic_long_t reclaim;
atomic_long_t reclaimed_journal_buckets;
atomic_long_t flush_write;
enum {

1
drivers/md/bcache/journal.c
View File

@ -614,6 +614,7 @@ static void journal_reclaim(struct cache_set *c)
k->ptr[n++] = MAKE_PTR(0,
bucket_to_sector(c, ca->sb.d[ja->cur_idx]),
ca->sb.nr_this_dev);
atomic_long_inc(&c->reclaimed_journal_buckets);
}
if (n) {

5
drivers/md/bcache/sysfs.c
View File

@ -82,6 +82,7 @@ read_attribute(bset_tree_stats);
read_attribute(state);
read_attribute(cache_read_races);
read_attribute(reclaim);
read_attribute(reclaimed_journal_buckets);
read_attribute(flush_write);
read_attribute(writeback_keys_done);
read_attribute(writeback_keys_failed);
@ -705,6 +706,9 @@ SHOW(__bch_cache_set)
sysfs_print(reclaim,
atomic_long_read(&c->reclaim));
sysfs_print(reclaimed_journal_buckets,
atomic_long_read(&c->reclaimed_journal_buckets));
sysfs_print(flush_write,
atomic_long_read(&c->flush_write));
@ -931,6 +935,7 @@ static struct attribute *bch_cache_set_internal_files[] = {
&sysfs_bset_tree_stats,
&sysfs_cache_read_races,
&sysfs_reclaim,
&sysfs_reclaimed_journal_buckets,
&sysfs_flush_write,
&sysfs_writeback_keys_done,
&sysfs_writeback_keys_failed,