bcachefs: bucket_alloc_fail tracepoint should only fire when we have to block

We don't want to fire the bucket_alloc_fail tracepoint on transaction
restart, when we can retry immediately - only when we the allocation
actually has to block.

Also, switch from sched_clock() to local_clock(), as we've been doing
elsewhere.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/alloc_foreground.c

@@ -561,7 +561,7 @@ static struct open_bucket *bch2_bucket_alloc_trans(struct btree_trans *trans,
 				&s,
 				cl == NULL,
 				"");
-	else
+	else if (!bch2_err_matches(PTR_ERR(ob), BCH_ERR_transaction_restart))
 		trace_and_count(c, bucket_alloc_fail, ca,
 				bch2_alloc_reserves[reserve],
 				may_alloc_partial,
@@ -1093,7 +1093,7 @@ static struct write_point *writepoint_find(struct btree_trans *trans,
 	hlist_add_head_rcu(&wp->node, head);
 	mutex_unlock(&c->write_points_hash_lock);
 out:
-	wp->last_used = sched_clock();
+	wp->last_used = local_clock();
 	return wp;
 }
 
@@ -1341,7 +1341,7 @@ void bch2_fs_allocator_foreground_init(struct bch_fs *c)
 	     wp < c->write_points + c->write_points_nr; wp++) {
 		writepoint_init(wp, BCH_DATA_user);
 
-		wp->last_used	= sched_clock();
+		wp->last_used	= local_clock();
 		wp->write_point	= (unsigned long) wp;
 		hlist_add_head_rcu(&wp->node,
 				   writepoint_hash(c, wp->write_point));