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bcachefs: Add more time stats for being blocked on allocator

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2019-03-18 13:42:10 -04:00 • committed by Kent Overstreet
parent 7c648fe899
commit 49a67206e4
3 changed files with 28 additions and 3 deletions
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21
fs/bcachefs/alloc_foreground.c
View file

@ -246,6 +246,10 @@ struct open_bucket *bch2_bucket_alloc(struct bch_fs *c, struct bch_dev *ca,
if (unlikely(c->open_buckets_nr_free <= open_buckets_reserved(reserve))) {
if (cl)
closure_wait(&c->open_buckets_wait, cl);
if (!c->blocked_allocate_open_bucket)
c->blocked_allocate_open_bucket = local_clock();
spin_unlock(&c->freelist_lock);
trace_open_bucket_alloc_fail(ca, reserve);
return ERR_PTR(-OPEN_BUCKETS_EMPTY);
@ -276,6 +280,9 @@ struct open_bucket *bch2_bucket_alloc(struct bch_fs *c, struct bch_dev *ca,
if (cl)
closure_wait(&c->freelist_wait, cl);
if (!c->blocked_allocate)
c->blocked_allocate = local_clock();
spin_unlock(&c->freelist_lock);
trace_bucket_alloc_fail(ca, reserve);
@ -301,6 +308,20 @@ out:
bucket_io_clock_reset(c, ca, bucket, WRITE);
spin_unlock(&ob->lock);
if (c->blocked_allocate_open_bucket) {
bch2_time_stats_update(
&c->times[BCH_TIME_blocked_allocate_open_bucket],
c->blocked_allocate_open_bucket);
c->blocked_allocate_open_bucket = 0;
}
if (c->blocked_allocate) {
bch2_time_stats_update(
&c->times[BCH_TIME_blocked_allocate],
c->blocked_allocate);
c->blocked_allocate = 0;
}
spin_unlock(&c->freelist_lock);
bch2_wake_allocator(ca);

8
fs/bcachefs/bcachefs.h
View file

@ -302,8 +302,10 @@ do { \
x(data_promote) \
x(journal_write) \
x(journal_delay) \
x(journal_blocked) \
x(journal_flush_seq)
x(journal_flush_seq) \
x(blocked_journal) \
x(blocked_allocate) \
x(blocked_allocate_open_bucket)
enum bch_time_stats {
#define x(name) BCH_TIME_##name,
@ -653,6 +655,8 @@ struct bch_fs {
/* ALLOCATOR */
spinlock_t freelist_lock;
struct closure_waitlist freelist_wait;
u64 blocked_allocate;
u64 blocked_allocate_open_bucket;
u8 open_buckets_freelist;
u8 open_buckets_nr_free;
struct closure_waitlist open_buckets_wait;

2
fs/bcachefs/super.c
View file

@ -596,7 +596,7 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
c->journal.write_time = &c->times[BCH_TIME_journal_write];
c->journal.delay_time = &c->times[BCH_TIME_journal_delay];
c->journal.blocked_time = &c->times[BCH_TIME_journal_blocked];
c->journal.blocked_time = &c->times[BCH_TIME_blocked_journal];
c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
bch2_fs_btree_cache_init_early(&c->btree_cache);