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1 | 26f7227b | Stefan Hajnoczi | #!/usr/bin/env python
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2 | 26f7227b | Stefan Hajnoczi | #
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3 | 26f7227b | Stefan Hajnoczi | # Pretty-printer for simple trace backend binary trace files
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4 | 26f7227b | Stefan Hajnoczi | #
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5 | 26f7227b | Stefan Hajnoczi | # Copyright IBM, Corp. 2010
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6 | 26f7227b | Stefan Hajnoczi | #
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7 | 26f7227b | Stefan Hajnoczi | # This work is licensed under the terms of the GNU GPL, version 2. See
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8 | 26f7227b | Stefan Hajnoczi | # the COPYING file in the top-level directory.
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9 | 26f7227b | Stefan Hajnoczi | #
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10 | 26f7227b | Stefan Hajnoczi | # For help see docs/tracing.txt
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11 | 26f7227b | Stefan Hajnoczi | |
12 | 26f7227b | Stefan Hajnoczi | import sys |
13 | 26f7227b | Stefan Hajnoczi | import struct |
14 | 26f7227b | Stefan Hajnoczi | import re |
15 | 26f7227b | Stefan Hajnoczi | |
16 | 26f7227b | Stefan Hajnoczi | header_event_id = 0xffffffffffffffff
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17 | 26f7227b | Stefan Hajnoczi | header_magic = 0xf2b177cb0aa429b4
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18 | 26f7227b | Stefan Hajnoczi | header_version = 0
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19 | 26f7227b | Stefan Hajnoczi | |
20 | 26f7227b | Stefan Hajnoczi | trace_fmt = '=QQQQQQQQ'
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21 | 26f7227b | Stefan Hajnoczi | trace_len = struct.calcsize(trace_fmt) |
22 | 6df40080 | Stefan Hajnoczi | event_re = re.compile(r'(disable\s+)?([a-zA-Z0-9_]+)\(([^)]*)\).*')
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23 | 26f7227b | Stefan Hajnoczi | |
24 | 26f7227b | Stefan Hajnoczi | def err(msg): |
25 | 26f7227b | Stefan Hajnoczi | sys.stderr.write(msg + '\n')
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26 | 26f7227b | Stefan Hajnoczi | sys.exit(1)
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27 | 26f7227b | Stefan Hajnoczi | |
28 | 26f7227b | Stefan Hajnoczi | def parse_events(fobj): |
29 | 26f7227b | Stefan Hajnoczi | """Parse a trace-events file."""
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30 | 26f7227b | Stefan Hajnoczi | |
31 | 26f7227b | Stefan Hajnoczi | def get_argnames(args): |
32 | 26f7227b | Stefan Hajnoczi | """Extract argument names from a parameter list."""
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33 | 26f7227b | Stefan Hajnoczi | return tuple(arg.split()[-1].lstrip('*') for arg in args.split(',')) |
34 | 26f7227b | Stefan Hajnoczi | |
35 | 26f7227b | Stefan Hajnoczi | events = {} |
36 | 26f7227b | Stefan Hajnoczi | event_num = 0
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37 | 26f7227b | Stefan Hajnoczi | for line in fobj: |
38 | 26f7227b | Stefan Hajnoczi | m = event_re.match(line.strip()) |
39 | 26f7227b | Stefan Hajnoczi | if m is None: |
40 | 26f7227b | Stefan Hajnoczi | continue
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41 | 26f7227b | Stefan Hajnoczi | |
42 | 6df40080 | Stefan Hajnoczi | disable, name, args = m.groups() |
43 | 26f7227b | Stefan Hajnoczi | events[event_num] = (name,) + get_argnames(args) |
44 | 26f7227b | Stefan Hajnoczi | event_num += 1
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45 | 26f7227b | Stefan Hajnoczi | return events
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46 | 26f7227b | Stefan Hajnoczi | |
47 | 26f7227b | Stefan Hajnoczi | def read_record(fobj): |
48 | 26f7227b | Stefan Hajnoczi | """Deserialize a trace record from a file."""
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49 | 26f7227b | Stefan Hajnoczi | s = fobj.read(trace_len) |
50 | 26f7227b | Stefan Hajnoczi | if len(s) != trace_len: |
51 | 26f7227b | Stefan Hajnoczi | return None |
52 | 26f7227b | Stefan Hajnoczi | return struct.unpack(trace_fmt, s)
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53 | 26f7227b | Stefan Hajnoczi | |
54 | 26f7227b | Stefan Hajnoczi | def read_trace_file(fobj): |
55 | 26f7227b | Stefan Hajnoczi | """Deserialize trace records from a file."""
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56 | 26f7227b | Stefan Hajnoczi | header = read_record(fobj) |
57 | 26f7227b | Stefan Hajnoczi | if header is None or \ |
58 | 26f7227b | Stefan Hajnoczi | header[0] != header_event_id or \ |
59 | 26f7227b | Stefan Hajnoczi | header[1] != header_magic or \ |
60 | 26f7227b | Stefan Hajnoczi | header[2] != header_version:
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61 | 26f7227b | Stefan Hajnoczi | err('not a trace file or incompatible version')
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62 | 26f7227b | Stefan Hajnoczi | |
63 | 26f7227b | Stefan Hajnoczi | while True: |
64 | 26f7227b | Stefan Hajnoczi | rec = read_record(fobj) |
65 | 26f7227b | Stefan Hajnoczi | if rec is None: |
66 | 26f7227b | Stefan Hajnoczi | break
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67 | 26f7227b | Stefan Hajnoczi | |
68 | 26f7227b | Stefan Hajnoczi | yield rec
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69 | 26f7227b | Stefan Hajnoczi | |
70 | 26f7227b | Stefan Hajnoczi | class Formatter(object): |
71 | 26f7227b | Stefan Hajnoczi | def __init__(self, events): |
72 | 26f7227b | Stefan Hajnoczi | self.events = events
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73 | 26f7227b | Stefan Hajnoczi | self.last_timestamp = None |
74 | 26f7227b | Stefan Hajnoczi | |
75 | 26f7227b | Stefan Hajnoczi | def format_record(self, rec): |
76 | 26f7227b | Stefan Hajnoczi | if self.last_timestamp is None: |
77 | 26f7227b | Stefan Hajnoczi | self.last_timestamp = rec[1] |
78 | 26f7227b | Stefan Hajnoczi | delta_ns = rec[1] - self.last_timestamp |
79 | 26f7227b | Stefan Hajnoczi | self.last_timestamp = rec[1] |
80 | 26f7227b | Stefan Hajnoczi | |
81 | 26f7227b | Stefan Hajnoczi | event = self.events[rec[0]] |
82 | 26f7227b | Stefan Hajnoczi | fields = [event[0], '%0.3f' % (delta_ns / 1000.0)] |
83 | 26f7227b | Stefan Hajnoczi | for i in xrange(1, len(event)): |
84 | 26f7227b | Stefan Hajnoczi | fields.append('%s=0x%x' % (event[i], rec[i + 1])) |
85 | 26f7227b | Stefan Hajnoczi | return ' '.join(fields) |
86 | 26f7227b | Stefan Hajnoczi | |
87 | 26f7227b | Stefan Hajnoczi | if len(sys.argv) != 3: |
88 | 26f7227b | Stefan Hajnoczi | err('usage: %s <trace-events> <trace-file>' % sys.argv[0]) |
89 | 26f7227b | Stefan Hajnoczi | |
90 | 26f7227b | Stefan Hajnoczi | events = parse_events(open(sys.argv[1], 'r')) |
91 | 26f7227b | Stefan Hajnoczi | formatter = Formatter(events) |
92 | 26f7227b | Stefan Hajnoczi | for rec in read_trace_file(open(sys.argv[2], 'rb')): |
93 | 26f7227b | Stefan Hajnoczi | print formatter.format_record(rec) |