tools: fix a python 3 map issue in dbstat and dbslower
In python 3, map returns an iterator and not a list anymore. This
patch cast the map into a list. It fixes the following error:
$ /usr/share/bcc/tools/dbstat mysql
Traceback (most recent call last):
File "/usr/share/bcc/tools/dbstat", line 95, in <module>
bpf = BPF(text=program, usdt_contexts=usdts)
File "/usr/lib/python3.6/site-packages/bcc/__init__.py", line 339, in __init__
ctx_array = (ct.c_void_p * len(usdt_contexts))()
TypeError: object of type 'map' has no len()
diff --git a/tools/dbslower.py b/tools/dbslower.py
index 9db225f..090d521 100755
--- a/tools/dbslower.py
+++ b/tools/dbslower.py
@@ -194,7 +194,7 @@
args.pids = map(int, subprocess.check_output(
"pidof postgres".split()).split())
- usdts = map(lambda pid: USDT(pid=pid), args.pids)
+ usdts = list(map(lambda pid: USDT(pid=pid), args.pids))
for usdt in usdts:
usdt.enable_probe("query__start", "query_start")
usdt.enable_probe("query__done", "query_end")