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>
48 lines
1.3 KiB
Python
48 lines
1.3 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Stderr built-in backend.
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"""
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__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
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__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
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__license__ = "GPL version 2 or (at your option) any later version"
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__maintainer__ = "Stefan Hajnoczi"
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__email__ = "stefanha@linux.vnet.ibm.com"
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from tracetool import out
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PUBLIC = True
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def generate_h_begin(events):
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out('#include <stdio.h>',
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'#include <sys/time.h>',
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'#include <sys/types.h>',
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'#include <unistd.h>',
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'#include "trace/control.h"',
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'')
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def generate_h(event):
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argnames = ", ".join(event.args.names())
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if len(event.args) > 0:
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argnames = ", " + argnames
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out(' if (trace_event_get_state(%(event_id)s)) {',
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' struct timeval _now;',
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' gettimeofday(&_now, NULL);',
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' fprintf(stderr, "%%d@%%zd.%%06zd:%(name)s " %(fmt)s "\\n",',
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' getpid(),',
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' (size_t)_now.tv_sec, (size_t)_now.tv_usec',
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' %(argnames)s);',
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' }',
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event_id="TRACE_" + event.name.upper(),
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name=event.name,
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fmt=event.fmt.rstrip("\n"),
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argnames=argnames)
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