Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

# gpg: Signature made Wed 12 Oct 2016 09:43:03 BST
# gpg:                using RSA key 0x9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/tracing-pull-request:
  trace: Add missing execution mode of guest events
  trace: introduce a formal group name for trace events
  trace: pass trace-events to tracetool as a positional param
  trace: push reading of events up a level to tracetool main
  trace: rename _read_events to read_events
  trace: get rid of generated-events.h/generated-events.c
  trace: dynamically allocate event IDs at runtime
  trace: dynamically allocate trace_dstate in CPUState
  trace: provide mechanism for registering trace events
  trace: don't abort qemu if ftrace can't be initialized
  trace: emit name <-> ID mapping in simpletrace header
  trace: remove the TraceEventID and TraceEventVCPUID enums
  trace: give each trace event a named TraceEvent struct
  trace: break circular dependency in event-internal.h
  trace: remove duplicate control.h includes in generated-tracers.h
  trace: remove global 'uint16 dstate[]' array
  trace: remove some now unused functions
  trace: convert code to use event iterators
  trace: add trace event iterator APIs
  trace: move colo trace events to net/ sub-directory

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 23 insertions, 3 deletions

diff --git a/scripts/tracetool/format/simpletrace_stap.py b/scripts/tracetool/format/simpletrace_stap.py
index 7e44bc1811..c35e662e00 100644
--- a/scripts/tracetool/format/simpletrace_stap.py
+++ b/scripts/tracetool/format/simpletrace_stap.py
@@ -19,8 +19,27 @@ from tracetool.backend.simple import is_string
 from tracetool.format.stap import stap_escape
 
 
-def generate(events, backend):
+def generate(events, backend, group):
     out('/* This file is autogenerated by tracetool, do not edit. */',
+        '',
+        'global event_name_to_id_map',
+        'global event_next_id',
+        'function simple_trace_map_event(name)',
+        '',
+        '{',
+        '    if (!([name] in event_name_to_id_map)) {',
+        '        event_name_to_id_map[name] = event_next_id',
+        '        name_len = strlen(name)',
+        '        printf("%%8b%%8b%%4b%%.*s", 0, ',
+        '               event_next_id, name_len, name_len, name)',
+        '        event_next_id = event_next_id + 1',
+        '    }',
+        '    return event_name_to_id_map[name]',
+        '}',
+        'probe begin',
+        '{',
+        '    printf("%%8b%%8b%%8b", 0xffffffffffffffff, 0xf2b177cb0aa429b4, 4)',
+        '}',
         '')
 
     for event_id, e in enumerate(events):
@@ -29,6 +48,7 @@ def generate(events, backend):
 
         out('probe %(probeprefix)s.simpletrace.%(name)s = %(probeprefix)s.%(name)s ?',
             '{',
+            '    id = simple_trace_map_event("%(name)s")',
             probeprefix=probeprefix(),
             name=e.name)
 
@@ -48,7 +68,7 @@ def generate(events, backend):
         sizestr = ' + '.join(sizes)
 
         # Generate format string and value pairs for record header and arguments
-        fields = [('8b', str(event_id)),
+        fields = [('8b', 'id'),
                   ('8b', 'gettimeofday_ns()'),
                   ('4b', sizestr),
                   ('4b', 'pid()')]
@@ -63,7 +83,7 @@ def generate(events, backend):
         # Emit the entire record in a single SystemTap printf()
         fmt_str = '%'.join(fmt for fmt, _ in fields)
         arg_str = ', '.join(arg for _, arg in fields)
-        out('    printf("%%%(fmt_str)s", %(arg_str)s)',
+        out('    printf("%%8b%%%(fmt_str)s", 1, %(arg_str)s)',
             fmt_str=fmt_str, arg_str=arg_str)
 
         out('}')