diff --git a/kmod/src/radix.c b/kmod/src/radix.c
index c508054e..a973ab50 100644
--- a/kmod/src/radix.c
+++ b/kmod/src/radix.c
@@ -1341,6 +1341,12 @@ int scoutfs_radix_merge(struct super_block *sb,
 	int ind;
 	int ret;
 
+	trace_scoutfs_radix_merge(sb, le64_to_cpu(dst->ref.blkno),
+				  le64_to_cpu(dst->ref.sm_total),
+				  le64_to_cpu(src->ref.blkno),
+				  le64_to_cpu(src->ref.sm_total),
+				  le64_to_cpu(inp->ref.blkno),
+				  le64_to_cpu(inp->ref.sm_total), count);
 	scoutfs_inc_counter(sb, radix_merge);
 
 	mutex_lock(&alloc->mutex);
@@ -1426,10 +1432,11 @@ wrapped:
 		fixup_parent_refs(sb, src_bl, -merged, -src_lg_delta);
 		fixup_parent_refs(sb, dst_bl, merged, dst_lg_delta);
 
-		trace_scoutfs_radix_merge(sb, inp, inp_bl->blkno, src,
-					  src_bl->blkno, dst, dst_bl->blkno,
-					  count, bit, ind, merged,
-					  src_lg_delta, dst_lg_delta);
+		trace_scoutfs_radix_merged_blocks(sb, inp, inp_bl->blkno, src,
+						  src_bl->blkno, dst,
+						  dst_bl->blkno, count, bit,
+						  ind, merged, src_lg_delta,
+						  dst_lg_delta);
 
 		complete_change(sb, wri, &chg, 0);
 
diff --git a/kmod/src/scoutfs_trace.h b/kmod/src/scoutfs_trace.h
index f44d0241..5abe16fc 100644
--- a/kmod/src/scoutfs_trace.h
+++ b/kmod/src/scoutfs_trace.h
@@ -2463,6 +2463,38 @@ DEFINE_EVENT(scoutfs_radix_bitop, scoutfs_radix_set_bits,
 );
 
 TRACE_EVENT(scoutfs_radix_merge,
+	TP_PROTO(struct super_block *sb, u64 dst_blkno, u64 dst_sm_tot,
+		 u64 src_blkno, u64 src_sm_tot, u64 inp_blkno, u64 inp_sm_tot,
+		 u64 count),
+	TP_ARGS(sb, dst_blkno, dst_sm_tot, src_blkno, src_sm_tot, inp_blkno,
+		inp_sm_tot, count),
+	TP_STRUCT__entry(
+		SCSB_TRACE_FIELDS
+		__field(__u64, dst_blkno)
+		__field(__u64, dst_sm_tot)
+		__field(__u64, src_blkno)
+		__field(__u64, src_sm_tot)
+		__field(__u64, inp_blkno)
+		__field(__u64, inp_sm_tot)
+		__field(__u64, count)
+	),
+	TP_fast_assign(
+		SCSB_TRACE_ASSIGN(sb);
+		__entry->dst_blkno = dst_blkno;
+		__entry->dst_sm_tot = dst_sm_tot;
+		__entry->src_blkno = src_blkno;
+		__entry->src_sm_tot = src_sm_tot;
+		__entry->inp_blkno = inp_blkno;
+		__entry->inp_sm_tot = inp_sm_tot;
+		__entry->count = count;
+	),
+	TP_printk(SCSBF" d_blkno %llu d_sm_tot %llu s_blkno %llu s_sm_tot %llu i_blkno %llu i_sm_tot %llu count %llu",
+		  SCSB_TRACE_ARGS, __entry->dst_blkno, __entry->dst_sm_tot,
+		  __entry->src_blkno, __entry->src_sm_tot, __entry->inp_blkno,
+		  __entry->inp_sm_tot, __entry->count)
+);
+
+TRACE_EVENT(scoutfs_radix_merged_blocks,
 	TP_PROTO(struct super_block *sb,
 		 struct scoutfs_radix_root *inp, u64 inp_blkno,
 		 struct scoutfs_radix_root *src, u64 src_blkno,