commit f733cacf002567f590c1a4eb2675d1429652736b
author Sasha Goldshtein <goldshtn@gmail.com> Tue Oct 04 18:39:01 2016 +0300
committer 4ast <alexei.starovoitov@gmail.com> Tue Oct 04 08:39:01 2016 -0700
tree 092e39814f4d872c2411cf1d22f6cc5db047b80b
parent ec679711ea310c40d3f1d929325e09f072624935

trace: Print USDT arg helpers in verbose mode (#723)

When verbose mode is enabled, ask all USDT helper
objects to print out the argument helper functions,
which help retrieve the argument values for each
individual probe location. This can be useful for
debugging probes; the helper functions are part of
the loaded BPF program, so they need to be printed
in verbose mode.

tools/trace.py

diff --git a/tools/trace.py b/tools/trace.py
index ee41373..742587b 100755
--- a/tools/trace.py
+++ b/tools/trace.py
@@ -576,6 +576,8 @@
                         # uprobe is being attached.
                         probe.usdt.enable_probe(
                                 probe.usdt_name, probe.probe_name)
+                        if self.args.verbose:
+                                print(probe.usdt.get_text())
                         usdt_contexts.append(probe.usdt)
                 self.bpf = BPF(text=self.program, usdt_contexts=usdt_contexts)
                 Tracepoint.attach(self.bpf)