@@ -211,6 +211,9 @@ effectively turns trace events into debug printfs.
This is the simplest backend and can be used together with existing code that
uses DPRINTF().
+The -msg timestamp=on|off command-line option controls whether or not to print
+the tid/timestamp prefix for each trace event.
+
=== Simpletrace ===
The "simple" backend supports common use cases and comes as part of the QEMU
@@ -20,6 +20,7 @@ PUBLIC = True
def generate_h_begin(events, group):
out('#include "qemu/log-for-trace.h"',
+ '#include "qemu/error-report.h"',
'')
@@ -35,14 +36,20 @@ def generate_h(event, group):
cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper())
out(' if (%(cond)s && qemu_loglevel_mask(LOG_TRACE)) {',
- ' struct timeval _now;',
- ' gettimeofday(&_now, NULL);',
+ ' if (message_with_timestamp) {',
+ ' struct timeval _now;',
+ ' gettimeofday(&_now, NULL);',
'#line %(event_lineno)d "%(event_filename)s"',
- ' qemu_log("%%d@%%zu.%%06zu:%(name)s " %(fmt)s "\\n",',
- ' qemu_get_thread_id(),',
- ' (size_t)_now.tv_sec, (size_t)_now.tv_usec',
- ' %(argnames)s);',
+ ' qemu_log("%%d@%%zu.%%06zu:%(name)s " %(fmt)s "\\n",',
+ ' qemu_get_thread_id(),',
+ ' (size_t)_now.tv_sec, (size_t)_now.tv_usec',
+ ' %(argnames)s);',
'#line %(out_next_lineno)d "%(out_filename)s"',
+ ' } else {',
+ '#line %(event_lineno)d "%(event_filename)s"',
+ ' qemu_log("%(name)s " %(fmt)s "\\n"%(argnames)s);',
+ '#line %(out_next_lineno)d "%(out_filename)s"',
+ ' }',
' }',
cond=cond,
event_lineno=event.lineno,
Timestamps in tracing output can be distracting. Make it possible to control tid/timestamp printing with -msg timestamp=on|off. The default is no tid/timestamps. Previously they were always printed. Suggested-by: BALATON Zoltan <balaton@eik.bme.hu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- docs/devel/tracing.txt | 3 +++ scripts/tracetool/backend/log.py | 19 +++++++++++++------ 2 files changed, 16 insertions(+), 6 deletions(-)