bcachefs: Switch to __func__for recording where btree_trans was initialized

Symbol decoding, via %ps, isn't supported in userspace - this will also
be faster when we're using trans->fn in the fast path, as with the new
BCH_JSET_ENTRY_log journal messages.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/btree_cache.c

@@ -857,7 +857,7 @@ struct btree *bch2_btree_node_get(struct btree_trans *trans, struct btree_path *
 			if (bch2_btree_node_relock(trans, path, level + 1))
 				goto retry;
 
-			trace_trans_restart_btree_node_reused(trans->ip,
+			trace_trans_restart_btree_node_reused(trans->fn,
 							      trace_ip,
 							      path->btree_id,
 							      &path->pos);

fs/bcachefs/btree_iter.c

@@ -350,7 +350,7 @@ bool __bch2_btree_node_lock(struct btree_trans *trans,
 	}
 
 	if (unlikely(deadlock_path)) {
-		trace_trans_restart_would_deadlock(trans->ip, ip,
+		trace_trans_restart_would_deadlock(trans->fn, ip,
 				trans->in_traverse_all, reason,
 				deadlock_path->btree_id,
 				deadlock_path->cached,
@@ -535,7 +535,7 @@ bool bch2_trans_relock(struct btree_trans *trans)
 	trans_for_each_path(trans, path)
 		if (path->should_be_locked &&
 		    !bch2_btree_path_relock(trans, path, _RET_IP_)) {
-			trace_trans_restart_relock(trans->ip, _RET_IP_,
+			trace_trans_restart_relock(trans->fn, _RET_IP_,
 					path->btree_id, &path->pos);
 			BUG_ON(!trans->restarted);
 			return false;
@@ -1505,7 +1505,9 @@ static int __btree_path_traverse_all(struct btree_trans *trans, int ret,
 out:
 	bch2_btree_cache_cannibalize_unlock(c);
 
-	trace_trans_traverse_all(trans->ip, trace_ip);
+	trans->in_traverse_all = false;
+
+	trace_trans_traverse_all(trans->fn, trace_ip);
 	return ret;
 }
 
@@ -2842,7 +2844,7 @@ void *bch2_trans_kmalloc(struct btree_trans *trans, size_t size)
 		trans->mem_bytes = new_bytes;
 
 		if (old_bytes) {
-			trace_trans_restart_mem_realloced(trans->ip, _RET_IP_, new_bytes);
+			trace_trans_restart_mem_realloced(trans->fn, _RET_IP_, new_bytes);
 			btree_trans_restart(trans);
 			return ERR_PTR(-EINTR);
 		}
@@ -2925,14 +2927,15 @@ static void bch2_trans_alloc_paths(struct btree_trans *trans, struct bch_fs *c)
 	trans->updates		= p; p += updates_bytes;
 }
 
-void bch2_trans_init(struct btree_trans *trans, struct bch_fs *c,
+void __bch2_trans_init(struct btree_trans *trans, struct bch_fs *c,
 		       unsigned expected_nr_iters,
-		     size_t expected_mem_bytes)
+		       size_t expected_mem_bytes,
+		       const char *fn)
 	__acquires(&c->btree_trans_barrier)
 {
 	memset(trans, 0, sizeof(*trans));
 	trans->c		= c;
-	trans->ip		= _RET_IP_;
+	trans->fn		= fn;
 	trans->journal_replay_not_finished =
 		!test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags);
 
@@ -2971,7 +2974,7 @@ static void check_btree_paths_leaked(struct btree_trans *trans)
 			goto leaked;
 	return;
 leaked:
-	bch_err(c, "btree paths leaked from %pS!", (void *) trans->ip);
+	bch_err(c, "btree paths leaked from %s!", trans->fn);
 	trans_for_each_path(trans, path)
 		if (path->ref)
 			printk(KERN_ERR "  btree %s %pS\n",
@@ -3069,7 +3072,7 @@ void bch2_btree_trans_to_text(struct printbuf *out, struct bch_fs *c)
 		if (!trans_has_locks(trans))
 			continue;
 
-		pr_buf(out, "%i %ps\n", trans->pid, (void *) trans->ip);
+		pr_buf(out, "%i %s\n", trans->pid, trans->fn);
 
 		trans_for_each_path(trans, path) {
 			if (!path->nodes_locked)

fs/bcachefs/btree_iter.h

@@ -379,9 +379,12 @@ __bch2_btree_iter_peek_and_restart(struct btree_trans *trans,
 /* new multiple iterator interface: */
 
 void bch2_dump_trans_paths_updates(struct btree_trans *);
-void bch2_trans_init(struct btree_trans *, struct bch_fs *, unsigned, size_t);
+void __bch2_trans_init(struct btree_trans *, struct bch_fs *,
+		       unsigned, size_t, const char *);
 void bch2_trans_exit(struct btree_trans *);
 
+#define bch2_trans_init(...)	__bch2_trans_init(__VA_ARGS__, __func__)
+
 void bch2_btree_trans_to_text(struct printbuf *, struct bch_fs *);
 
 void bch2_fs_btree_iter_exit(struct bch_fs *);

fs/bcachefs/btree_key_cache.c

@@ -224,7 +224,7 @@ static int btree_key_cache_fill(struct btree_trans *trans,
 		goto err;
 
 	if (!bch2_btree_node_relock(trans, ck_path, 0)) {
-		trace_transaction_restart_ip(trans->ip, _THIS_IP_);
+		trace_transaction_restart_ip(trans->fn, _THIS_IP_);
 		ret = btree_trans_restart(trans);
 		goto err;
 	}
@@ -319,7 +319,7 @@ int bch2_btree_path_traverse_cached(struct btree_trans *trans, struct btree_path
 			if (!trans->restarted)
 				goto retry;
 
-			trace_transaction_restart_ip(trans->ip, _THIS_IP_);
+			trace_transaction_restart_ip(trans->fn, _THIS_IP_);
 			ret = -EINTR;
 			goto err;
 		}
@@ -339,7 +339,7 @@ int bch2_btree_path_traverse_cached(struct btree_trans *trans, struct btree_path
 	if (!ck->valid && !(flags & BTREE_ITER_CACHED_NOFILL)) {
 		if (!path->locks_want &&
 		    !__bch2_btree_path_upgrade(trans, path, 1)) {
-			trace_transaction_restart_ip(trans->ip, _THIS_IP_);
+			trace_transaction_restart_ip(trans->fn, _THIS_IP_);
 			ret = btree_trans_restart(trans);
 			goto err;
 		}

fs/bcachefs/btree_types.h

@@ -365,6 +365,7 @@ struct btree_trans_commit_hook {
 
 struct btree_trans {
 	struct bch_fs		*c;
+	const char		*fn;
 	struct list_head	list;
 	struct btree		*locking;
 	unsigned		locking_path_idx;
@@ -372,7 +373,6 @@ struct btree_trans {
 	u8			locking_btree_id;
 	u8			locking_level;
 	pid_t			pid;
-	unsigned long		ip;
 	int			srcu_idx;
 
 	u8			nr_sorted;

fs/bcachefs/btree_update_interior.c

@@ -955,7 +955,7 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
 	 * instead of locking/reserving all the way to the root:
 	 */
 	if (!bch2_btree_path_upgrade(trans, path, U8_MAX)) {
-		trace_trans_restart_iter_upgrade(trans->ip, _RET_IP_,
+		trace_trans_restart_iter_upgrade(trans->fn, _RET_IP_,
 						 path->btree_id, &path->pos);
 		ret = btree_trans_restart(trans);
 		return ERR_PTR(ret);
@@ -1019,7 +1019,7 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
 				BTREE_UPDATE_JOURNAL_RES,
 				journal_flags);
 		if (ret) {
-			trace_trans_restart_journal_preres_get(trans->ip, _RET_IP_);
+			trace_trans_restart_journal_preres_get(trans->fn, _RET_IP_);
 			goto err;
 		}
 

fs/bcachefs/btree_update_leaf.c

@@ -266,7 +266,7 @@ bch2_trans_journal_preres_get_cold(struct btree_trans *trans, unsigned u64s,
 		return ret;
 
 	if (!bch2_trans_relock(trans)) {
-		trace_trans_restart_journal_preres_get(trans->ip, trace_ip);
+		trace_trans_restart_journal_preres_get(trans->fn, trace_ip);
 		return -EINTR;
 	}
 
@@ -305,7 +305,8 @@ static noinline void journal_transaction_name(struct btree_trans *trans)
 	l->entry.pad[0]		= 0;
 	l->entry.pad[1]		= 0;
 	l->entry.pad[2]		= 0;
-	b = snprintf(l->d, buflen, "%ps", (void *) trans->ip);
+	b = min_t(unsigned, strlen(trans->fn), buflen);
+	memcpy(l->d, trans->fn, b);
 	while (b < buflen)
 		l->d[b++] = '\0';
 
@@ -426,7 +427,7 @@ bch2_trans_commit_write_locked(struct btree_trans *trans,
 	int ret;
 
 	if (race_fault()) {
-		trace_trans_restart_fault_inject(trans->ip, trace_ip);
+		trace_trans_restart_fault_inject(trans->fn, trace_ip);
 		trans->restarted = true;
 		return -EINTR;
 	}
@@ -619,7 +620,7 @@ static inline int trans_lock_write(struct btree_trans *trans)
 		bch2_btree_node_unlock_write_inlined(trans, i->path, insert_l(i)->b);
 	}
 
-	trace_trans_restart_would_deadlock_write(trans->ip);
+	trace_trans_restart_would_deadlock_write(trans->fn);
 	return btree_trans_restart(trans);
 }
 
@@ -650,9 +651,8 @@ static inline int do_bch2_trans_commit(struct btree_trans *trans,
 			char buf[200];
 
 			bch2_bkey_val_to_text(&PBUF(buf), c, bkey_i_to_s_c(i->k));
-			bch_err(c, "invalid bkey %s on insert from %ps -> %ps: %s\n",
-				buf, (void *) trans->ip,
-				(void *) i->ip_allocated, invalid);
+			bch_err(c, "invalid bkey %s on insert from %s -> %ps: %s\n",
+				buf, trans->fn, (void *) i->ip_allocated, invalid);
 			bch2_fatal_error(c);
 			return -EINVAL;
 		}
@@ -758,7 +758,7 @@ int bch2_trans_commit_error(struct btree_trans *trans,
 			return 0;
 
 		if (ret == -EINTR)
-			trace_trans_restart_btree_node_split(trans->ip, trace_ip,
+			trace_trans_restart_btree_node_split(trans->fn, trace_ip,
 						i->btree_id, &i->path->pos);
 		break;
 	case BTREE_INSERT_NEED_MARK_REPLICAS:
@@ -771,7 +771,7 @@ int bch2_trans_commit_error(struct btree_trans *trans,
 		if (bch2_trans_relock(trans))
 			return 0;
 
-		trace_trans_restart_mark_replicas(trans->ip, trace_ip);
+		trace_trans_restart_mark_replicas(trans->fn, trace_ip);
 		ret = -EINTR;
 		break;
 	case BTREE_INSERT_NEED_JOURNAL_RES:
@@ -791,13 +791,13 @@ int bch2_trans_commit_error(struct btree_trans *trans,
 		if (bch2_trans_relock(trans))
 			return 0;
 
-		trace_trans_restart_journal_res_get(trans->ip, trace_ip);
+		trace_trans_restart_journal_res_get(trans->fn, trace_ip);
 		ret = -EINTR;
 		break;
 	case BTREE_INSERT_NEED_JOURNAL_RECLAIM:
 		bch2_trans_unlock(trans);
 
-		trace_trans_blocked_journal_reclaim(trans->ip, trace_ip);
+		trace_trans_blocked_journal_reclaim(trans->fn, trace_ip);
 
 		wait_event_freezable(c->journal.reclaim_wait,
 				     (ret = journal_reclaim_wait_done(c)));
@@ -807,7 +807,7 @@ int bch2_trans_commit_error(struct btree_trans *trans,
 		if (bch2_trans_relock(trans))
 			return 0;
 
-		trace_trans_restart_journal_reclaim(trans->ip, trace_ip);
+		trace_trans_restart_journal_reclaim(trans->fn, trace_ip);
 		ret = -EINTR;
 		break;
 	default:
@@ -902,7 +902,7 @@ static int bch2_trans_commit_run_triggers(struct btree_trans *trans)
 				}
 
 				if (ret == -EINTR)
-					trace_trans_restart_mark(trans->ip, _RET_IP_,
+					trace_trans_restart_mark(trans->fn, _RET_IP_,
 							i->btree_id, &i->path->pos);
 				if (ret)
 					return ret;
@@ -932,7 +932,7 @@ static int bch2_trans_commit_run_triggers(struct btree_trans *trans)
 						BTREE_TRIGGER_OVERWRITE|i->flags);
 
 				if (ret == -EINTR)
-					trace_trans_restart_mark(trans->ip, _RET_IP_,
+					trace_trans_restart_mark(trans->fn, _RET_IP_,
 							i->btree_id, &i->path->pos);
 				if (ret)
 					return ret;
@@ -999,7 +999,7 @@ int __bch2_trans_commit(struct btree_trans *trans)
 		BUG_ON(!i->path->should_be_locked);
 
 		if (unlikely(!bch2_btree_path_upgrade(trans, i->path, i->level + 1))) {
-			trace_trans_restart_upgrade(trans->ip, _RET_IP_,
+			trace_trans_restart_upgrade(trans->fn, _RET_IP_,
 						    i->btree_id, &i->path->pos);
 			ret = btree_trans_restart(trans);
 			goto out;

fs/bcachefs/fs.c

@@ -135,7 +135,6 @@ int __must_check bch2_write_inode(struct bch_fs *c,
 	int ret;
 
 	bch2_trans_init(&trans, c, 0, 512);
-	trans.ip = _RET_IP_;
 retry:
 	bch2_trans_begin(&trans);
 

fs/bcachefs/trace.h

@@ -546,94 +546,81 @@ TRACE_EVENT(copygc_wait,
 		  __entry->wait_amount, __entry->until)
 );
 
-TRACE_EVENT(transaction_restart_ip,
-	TP_PROTO(unsigned long caller, unsigned long ip),
-	TP_ARGS(caller, ip),
-
-	TP_STRUCT__entry(
-		__field(unsigned long,		caller	)
-		__field(unsigned long,		ip	)
-	),
-
-	TP_fast_assign(
-		__entry->caller	= caller;
-		__entry->ip	= ip;
-	),
-
-	TP_printk("%pS %pS", (void *) __entry->caller, (void *) __entry->ip)
-);
-
 DECLARE_EVENT_CLASS(transaction_restart,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip),
+	TP_ARGS(trans_fn, caller_ip),
 
 	TP_STRUCT__entry(
-		__field(unsigned long,		trans_ip	)
+		__array(char,			trans_fn, 24	)
 		__field(unsigned long,		caller_ip	)
 	),
 
 	TP_fast_assign(
-		__entry->trans_ip		= trans_ip;
+		strncpy(__entry->trans_fn, trans_fn, sizeof(__entry->trans_fn));
 		__entry->caller_ip		= caller_ip;
 	),
 
-	TP_printk("%pS %pS",
-		  (void *) __entry->trans_ip,
-		  (void *) __entry->caller_ip)
+	TP_printk("%s %pS", __entry->trans_fn, (void *) __entry->caller_ip)
+);
+
+DEFINE_EVENT(transaction_restart,	transaction_restart_ip,
+	TP_PROTO(const char *trans_fn,
+		 unsigned long caller_ip),
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DEFINE_EVENT(transaction_restart,	trans_blocked_journal_reclaim,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip)
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DEFINE_EVENT(transaction_restart,	trans_restart_journal_res_get,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip)
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DEFINE_EVENT(transaction_restart,	trans_restart_journal_preres_get,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip)
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DEFINE_EVENT(transaction_restart,	trans_restart_journal_reclaim,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip)
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DEFINE_EVENT(transaction_restart,	trans_restart_fault_inject,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip)
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DEFINE_EVENT(transaction_restart,	trans_traverse_all,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip)
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DEFINE_EVENT(transaction_restart,	trans_restart_mark_replicas,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip),
-	TP_ARGS(trans_ip, caller_ip)
+	TP_ARGS(trans_fn, caller_ip)
 );
 
 DECLARE_EVENT_CLASS(transaction_restart_iter,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos),
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos),
 
 	TP_STRUCT__entry(
-		__field(unsigned long,		trans_ip	)
+		__array(char,			trans_fn, 24	)
 		__field(unsigned long,		caller_ip	)
 		__field(u8,			btree_id	)
 		__field(u64,			pos_inode	)
@@ -642,7 +629,7 @@ DECLARE_EVENT_CLASS(transaction_restart_iter,
 	),
 
 	TP_fast_assign(
-		__entry->trans_ip		= trans_ip;
+		strncpy(__entry->trans_fn, trans_fn, sizeof(__entry->trans_fn));
 		__entry->caller_ip		= caller_ip;
 		__entry->btree_id		= btree_id;
 		__entry->pos_inode		= pos->inode;
@@ -650,8 +637,8 @@ DECLARE_EVENT_CLASS(transaction_restart_iter,
 		__entry->pos_snapshot		= pos->snapshot;
 	),
 
-	TP_printk("%ps %pS btree %u pos %llu:%llu:%u",
-		  (void *) __entry->trans_ip,
+	TP_printk("%s %pS btree %u pos %llu:%llu:%u",
+		  __entry->trans_fn,
 		  (void *) __entry->caller_ip,
 		  __entry->btree_id,
 		  __entry->pos_inode,
@@ -660,63 +647,63 @@ DECLARE_EVENT_CLASS(transaction_restart_iter,
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_btree_node_reused,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos)
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos)
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_btree_node_split,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos)
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos)
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_mark,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos)
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos)
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_upgrade,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos)
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos)
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_iter_upgrade,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos)
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos)
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_relock,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos)
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos)
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_traverse,
-	TP_PROTO(unsigned long trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long caller_ip,
 		 enum btree_id btree_id,
 		 struct bpos *pos),
-	TP_ARGS(trans_ip, caller_ip, btree_id, pos)
+	TP_ARGS(trans_fn, caller_ip, btree_id, pos)
 );
 
 TRACE_EVENT(trans_restart_would_deadlock,
-	TP_PROTO(unsigned long	trans_ip,
+	TP_PROTO(const char *trans_fn,
 		 unsigned long	caller_ip,
 		 bool		in_traverse_all,
 		 unsigned	reason,
@@ -726,12 +713,12 @@ TRACE_EVENT(trans_restart_would_deadlock,
 		 enum btree_id	want_btree_id,
 		 unsigned	want_iter_type,
 		 struct bpos	*want_pos),
-	TP_ARGS(trans_ip, caller_ip, in_traverse_all, reason,
+	TP_ARGS(trans_fn, caller_ip, in_traverse_all, reason,
 		have_btree_id, have_iter_type, have_pos,
 		want_btree_id, want_iter_type, want_pos),
 
 	TP_STRUCT__entry(
-		__field(unsigned long,		trans_ip	)
+		__array(char,			trans_fn, 24	)
 		__field(unsigned long,		caller_ip	)
 		__field(u8,			in_traverse_all	)
 		__field(u8,			reason		)
@@ -749,7 +736,7 @@ TRACE_EVENT(trans_restart_would_deadlock,
 	),
 
 	TP_fast_assign(
-		__entry->trans_ip		= trans_ip;
+		strncpy(__entry->trans_fn, trans_fn, sizeof(__entry->trans_fn));
 		__entry->caller_ip		= caller_ip;
 		__entry->in_traverse_all	= in_traverse_all;
 		__entry->reason			= reason;
@@ -767,8 +754,8 @@ TRACE_EVENT(trans_restart_would_deadlock,
 		__entry->want_pos_snapshot	= want_pos->snapshot;
 	),
 
-	TP_printk("%pS %pS traverse_all %u because %u have %u:%u %llu:%llu:%u want %u:%u %llu:%llu:%u",
-		  (void *) __entry->trans_ip,
+	TP_printk("%s %pS traverse_all %u because %u have %u:%u %llu:%llu:%u want %u:%u %llu:%llu:%u",
+		  __entry->trans_fn,
 		  (void *) __entry->caller_ip,
 		  __entry->in_traverse_all,
 		  __entry->reason,
@@ -785,39 +772,40 @@ TRACE_EVENT(trans_restart_would_deadlock,
 );
 
 TRACE_EVENT(trans_restart_would_deadlock_write,
-	TP_PROTO(unsigned long trans_ip),
-	TP_ARGS(trans_ip),
+	TP_PROTO(const char *trans_fn),
+	TP_ARGS(trans_fn),
 
 	TP_STRUCT__entry(
-		__field(unsigned long,		trans_ip	)
+		__array(char,			trans_fn, 24	)
 	),
 
 	TP_fast_assign(
-		__entry->trans_ip	= trans_ip;
+		strncpy(__entry->trans_fn, trans_fn, sizeof(__entry->trans_fn));
 	),
 
-	TP_printk("%ps", (void *) __entry->trans_ip)
+	TP_printk("%s", __entry->trans_fn)
 );
 
 TRACE_EVENT(trans_restart_mem_realloced,
-	TP_PROTO(unsigned long trans_ip, unsigned long caller_ip,
+	TP_PROTO(const char *trans_fn,
+		 unsigned long caller_ip,
 		 unsigned long bytes),
-	TP_ARGS(trans_ip, caller_ip, bytes),
+	TP_ARGS(trans_fn, caller_ip, bytes),
 
 	TP_STRUCT__entry(
-		__field(unsigned long,		trans_ip	)
+		__array(char,			trans_fn, 24	)
 		__field(unsigned long,		caller_ip	)
 		__field(unsigned long,		bytes		)
 	),
 
 	TP_fast_assign(
-		__entry->trans_ip	= trans_ip;
+		strncpy(__entry->trans_fn, trans_fn, sizeof(__entry->trans_fn));
 		__entry->caller_ip	= caller_ip;
 		__entry->bytes		= bytes;
 	),
 
-	TP_printk("%pS %pS bytes %lu",
-		  (void *) __entry->trans_ip,
+	TP_printk("%s %pS bytes %lu",
+		  __entry->trans_fn,
 		  (void *) __entry->caller_ip,
 		  __entry->bytes)
 );