examples: disksnoop checks if blk_start_request exists before attachi…

…ng kprobe
ego · May 28, 2019 · a57dad4 · a57dad4
1 parent 7554866
commit a57dad4
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/examples/tracing/disksnoop.py b/examples/tracing/disksnoop.py
@@ -43,7 +43,8 @@
 }
 """)
 
-b.attach_kprobe(event="blk_start_request", fn_name="trace_start")
+if BPF.get_kprobe_functions(b'blk_start_request'):
+ b.attach_kprobe(event="blk_start_request", fn_name="trace_start")
 b.attach_kprobe(event="blk_mq_start_request", fn_name="trace_start")
 b.attach_kprobe(event="blk_account_io_completion", fn_name="trace_completion")