adding filtering example to trace.py help

yingtaojuzi · Jan 24, 2018 · 86293f0 · 86293f0
1 parent 89aa294
commit 86293f0
Show file tree

Hide file tree

Showing 2 changed files with 9 additions and 0 deletions.
diff --git a/tools/trace.py b/tools/trace.py
@@ -602,6 +602,10 @@ class Tool(object):
  in kernel/sched/sched.h which is in kernel source tree and not in kernel-devel
  package. So this command needs to run at the kernel source tree root directory
  so that the added header file can be found by the compiler.
+trace -I 'net/sock.h' \\
+ 'udpv6_sendmsg(struct sock *sk) (sk->sk_dport == 13568)'
+ Trace udpv6 sendmsg calls only if socket's destination port is equal
+ to 53 (DNS; 13568 in big endian order)
 """
 
  def __init__(self):

diff --git a/tools/trace_example.txt b/tools/trace_example.txt
@@ -292,3 +292,8 @@ trace -I 'kernel/sched/sched.h' \
  in kernel/sched/sched.h which is in kernel source tree and not in kernel-devel
  package. So this command needs to run at the kernel source tree root directory
  so that the added header file can be found by the compiler.
+trace -I 'net/sock.h' \\
+ 'udpv6_sendmsg(struct sock *sk) (sk->sk_dport == 13568)'
+ Trace udpv6 sendmsg calls only if socket's destination port is equal
+ to 53 (DNS; 13568 in big endian order)
+"