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| author | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2015-01-20 09:41:15 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2015-02-06 10:27:22 +0000 |
| commit | dd9fe29c80b8a35f12d98928a97be3aded80cf69 (patch) | |
| tree | 1dd36451cb2c4f425607b6472626c4376f79a6d0 | |
| parent | 16017c48547960539fcadb1f91d252124f442482 (diff) | |
| download | qemu-dd9fe29c80b8a35f12d98928a97be3aded80cf69.zip qemu-dd9fe29c80b8a35f12d98928a97be3aded80cf69.tar.gz qemu-dd9fe29c80b8a35f12d98928a97be3aded80cf69.tar.bz2 | |
trace: Print PID and time in stderr traces
When debugging migration it's useful to know the PID of
each trace message so you can figure out if it came from the source
or the destination.
Printing the time makes it easy to do latency measurements or timings
between trace points.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 1421746875-9962-1-git-send-email-dgilbert@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| -rw-r--r-- | scripts/tracetool/backend/stderr.py | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/scripts/tracetool/backend/stderr.py b/scripts/tracetool/backend/stderr.py index 2a1e906..ca58054 100644 --- a/scripts/tracetool/backend/stderr.py +++ b/scripts/tracetool/backend/stderr.py @@ -21,6 +21,9 @@ PUBLIC = True def generate_h_begin(events): out('#include <stdio.h>', + '#include <sys/time.h>', + '#include <sys/types.h>', + '#include <unistd.h>', '#include "trace/control.h"', '') @@ -31,7 +34,12 @@ def generate_h(event): argnames = ", " + argnames out(' if (trace_event_get_state(%(event_id)s)) {', - ' fprintf(stderr, "%(name)s " %(fmt)s "\\n" %(argnames)s);', + ' struct timeval _now;', + ' gettimeofday(&_now, NULL);', + ' fprintf(stderr, "%%d@%%zd.%%06zd:%(name)s " %(fmt)s "\\n",', + ' getpid(),', + ' (size_t)_now.tv_sec, (size_t)_now.tv_usec', + ' %(argnames)s);', ' }', event_id="TRACE_" + event.name.upper(), name=event.name, |