Add support for java method tracing with systemtap

[Mark Wielaard]

Hi,

The latest release of systemtap (0.9.9) adds better support for handling
dtrace markers in user space programs as also used in hotspot. The
following patch adds some cleanups so these probes are activated and
provides a nice tapset to use with it.

2009-08-05  Mark Wielaard  <mjw at redhat.com>

    * patches/icedtea-systemtap.patch: Remove workaround for
    nmethod.cpp.
    * tapset/hotspot.stp.in: Add tapset functions for
    hotspot.method_entry, hotspot.method_return,
    hotspot.compiled_method_load and hotspot.compiled_method_unload.
    * NEWS: Metion new support for java method tracing.
    * INSTALL: Add that java method tracing support needs systemtap
    0.9.9 or higher.

With this you can now do stuff like:

$ stap -e \
'probe hotspot.method_entry
 {log(thread_indent(1) . "=> " . class . "." . method . sig)}
 probe hotspot.method_return
 {log(thread_indent(-1) . "<= " . class . "." . method . sig)}' \
-c 'java -XX:+ExtendedDTraceProbes Hello'

And get output like:

     0 java(26933):=> Hello.main([Ljava/lang/String;)V
     9 java(26933): => java/lang/ClassLoader.checkPackageAccess(Ljava/lang/Class;Ljava/security/ProtectionDomain;)V
    16 java(26933):  => java/lang/System.getSecurityManager()Ljava/lang/SecurityManager;
    23 java(26933):  <= java/lang/System.getSecurityManager()Ljava/lang/SecurityManager;
    30 java(26933):  => java/util/HashSet.add(Ljava/lang/Object;)Z
    37 java(26933):   => java/util/HashMap.put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    43 java(26933):    => java/lang/Object.hashCode()I
    50 java(26933):    <= java/lang/Object.hashCode()I
    56 java(26933):    => java/util/HashMap.hash(I)I
    63 java(26933):    <= java/util/HashMap.hash(I)I
    69 java(26933):    => java/util/HashMap.indexFor(II)I
    76 java(26933):    <= java/util/HashMap.indexFor(II)I
    83 java(26933):   <= java/util/HashMap.put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    89 java(26933):  <= java/util/HashSet.add(Ljava/lang/Object;)Z
    96 java(26933): <= java/lang/ClassLoader.checkPackageAccess(Ljava/lang/Class;Ljava/security/ProtectionDomain;)V
[...]
  2611 java(26933):   => java/io/BufferedOutputStream.flush()V
  2617 java(26933):    => java/io/BufferedOutputStream.flushBuffer()V
  2624 java(26933):    <= java/io/BufferedOutputStream.flushBuffer()V
  2630 java(26933):   <= java/io/BufferedOutputStream.flush()V
  2636 java(26933):  <= java/io/PrintStream.newLine()V
  2643 java(26933): <= java/io/PrintStream.println(Ljava/lang/String;)V
  2649 java(26933):<= Hello.main([Ljava/lang/String;)V

Have fun!

Mark
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