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trace: make the 'log' backend timestamp configurable

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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>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20210125113507.224287-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2021-01-25 11:35:07 +00:00
parent 651d588f03
commit 418ed14268
2 changed files with 16 additions and 6 deletions
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3
docs/devel/tracing.rst
View File

@ -224,6 +224,9 @@ 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
-----------

19
scripts/tracetool/backend/log.py
View File

@ -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,