tools/biolatency: Use '<unknown>' instead of empty disk name
diff --git a/tools/biosnoop.py b/tools/biosnoop.py
index a2b636a..4b80df9 100755
--- a/tools/biosnoop.py
+++ b/tools/biosnoop.py
@@ -180,7 +180,7 @@
b.attach_kprobe(event="blk_account_io_done", fn_name="trace_req_completion")
# header
-print("%-11s %-14s %-6s %-7s %-1s %-10s %-7s" % ("TIME(s)", "COMM", "PID",
+print("%-11s %-14s %-6s %-9s %-1s %-10s %-7s" % ("TIME(s)", "COMM", "PID",
"DISK", "T", "SECTOR", "BYTES"), end="")
if args.queue:
print("%7s " % ("QUE(ms)"), end="")
@@ -206,10 +206,13 @@
delta = float(event.ts) - start_ts
- print("%-11.6f %-14.14s %-6s %-7s %-1s %-10s %-7s" % (
+ disk_name = event.disk_name.decode('utf-8', 'replace')
+ if not disk_name:
+ disk_name = '<unknown>'
+
+ print("%-11.6f %-14.14s %-6s %-9s %-1s %-10s %-7s" % (
delta / 1000000, event.name.decode('utf-8', 'replace'), event.pid,
- event.disk_name.decode('utf-8', 'replace'), rwflg, event.sector,
- event.len), end="")
+ disk_name, rwflg, event.sector, event.len), end="")
if args.queue:
print("%7.2f " % (float(event.qdelta) / 1000000), end="")
print("%7.2f" % (float(event.delta) / 1000000))
