# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
#
-# For help see docs/tracing.txt
+# For help see docs/devel/tracing.txt
import struct
import re
import inspect
-from tracetool import _read_events, Event
+from tracetool import read_events, Event
from tracetool.backend.simple import is_string
header_event_id = 0xffffffffffffffff
header_magic = 0xf2b177cb0aa429b4
dropped_event_id = 0xfffffffffffffffe
+record_type_mapping = 0
+record_type_event = 1
+
log_header_fmt = '=QQQ'
rec_header_fmt = '=QQII'
return None
return struct.unpack(hfmt, hdr)
-def get_record(edict, rechdr, fobj):
- """Deserialize a trace record from a file into a tuple (event_num, timestamp, pid, arg1, ..., arg6)."""
+def get_record(edict, idtoname, rechdr, fobj):
+ """Deserialize a trace record from a file into a tuple
+ (name, timestamp, pid, arg1, ..., arg6)."""
if rechdr is None:
return None
- rec = (rechdr[0], rechdr[1], rechdr[3])
if rechdr[0] != dropped_event_id:
event_id = rechdr[0]
- event = edict[event_id]
+ name = idtoname[event_id]
+ rec = (name, rechdr[1], rechdr[3])
+ try:
+ event = edict[name]
+ except KeyError, e:
+ import sys
+ sys.stderr.write('%s event is logged but is not declared ' \
+ 'in the trace events file, try using ' \
+ 'trace-events-all instead.\n' % str(e))
+ sys.exit(1)
+
for type, name in event.args:
if is_string(type):
l = fobj.read(4)
(value,) = struct.unpack('=Q', fobj.read(8))
rec = rec + (value,)
else:
+ rec = ("dropped", rechdr[1], rechdr[3])
(value,) = struct.unpack('=Q', fobj.read(8))
rec = rec + (value,)
return rec
+def get_mapping(fobj):
+ (event_id, ) = struct.unpack('=Q', fobj.read(8))
+ (len, ) = struct.unpack('=L', fobj.read(4))
+ name = fobj.read(len)
-def read_record(edict, fobj):
+ return (event_id, name)
+
+def read_record(edict, idtoname, fobj):
"""Deserialize a trace record from a file into a tuple (event_num, timestamp, pid, arg1, ..., arg6)."""
rechdr = read_header(fobj, rec_header_fmt)
- return get_record(edict, rechdr, fobj) # return tuple of record elements
+ return get_record(edict, idtoname, rechdr, fobj)
def read_trace_header(fobj):
"""Read and verify trace file header"""
header = read_header(fobj, log_header_fmt)
- if header is None or \
- header[0] != header_event_id or \
- header[1] != header_magic:
+ if header is None:
raise ValueError('Not a valid trace file!')
+ if header[0] != header_event_id:
+ raise ValueError('Not a valid trace file, header id %d != %d' %
+ (header[0], header_event_id))
+ if header[1] != header_magic:
+ raise ValueError('Not a valid trace file, header magic %d != %d' %
+ (header[1], header_magic))
log_version = header[2]
- if log_version not in [0, 2, 3]:
+ if log_version not in [0, 2, 3, 4]:
raise ValueError('Unknown version of tracelog format!')
- if log_version != 3:
+ if log_version != 4:
raise ValueError('Log format %d not supported with this QEMU release!'
% log_version)
-def read_trace_records(edict, fobj):
- """Deserialize trace records from a file, yielding record tuples (event_num, timestamp, pid, arg1, ..., arg6)."""
+def read_trace_records(edict, idtoname, fobj):
+ """Deserialize trace records from a file, yielding record tuples (event_num, timestamp, pid, arg1, ..., arg6).
+
+ Note that `idtoname` is modified if the file contains mapping records.
+
+ Args:
+ edict (str -> Event): events dict, indexed by name
+ idtoname (int -> str): event names dict, indexed by event ID
+ fobj (file): input file
+
+ """
while True:
- rec = read_record(edict, fobj)
- if rec is None:
+ t = fobj.read(8)
+ if len(t) == 0:
break
- yield rec
+ (rectype, ) = struct.unpack('=Q', t)
+ if rectype == record_type_mapping:
+ event_id, name = get_mapping(fobj)
+ idtoname[event_id] = name
+ else:
+ rec = read_record(edict, idtoname, fobj)
+
+ yield rec
class Analyzer(object):
"""A trace file analyzer which processes trace records.
is invoked.
If a method matching a trace event name exists, it is invoked to process
- that trace record. Otherwise the catchall() method is invoked."""
+ that trace record. Otherwise the catchall() method is invoked.
+
+ Example:
+ The following method handles the runstate_set(int new_state) trace event::
+
+ def runstate_set(self, new_state):
+ ...
+
+ The method can also take a timestamp argument before the trace event
+ arguments::
+
+ def runstate_set(self, timestamp, new_state):
+ ...
+
+ Timestamps have the uint64_t type and are in nanoseconds.
+
+ The pid can be included in addition to the timestamp and is useful when
+ dealing with traces from multiple processes::
+
+ def runstate_set(self, timestamp, pid, new_state):
+ ...
+ """
def begin(self):
"""Called at the start of the trace."""
def process(events, log, analyzer, read_header=True):
"""Invoke an analyzer on each event in a log."""
if isinstance(events, str):
- events = _read_events(open(events, 'r'))
+ events = read_events(open(events, 'r'), events)
if isinstance(log, str):
log = open(log, 'rb')
read_trace_header(log)
dropped_event = Event.build("Dropped_Event(uint64_t num_events_dropped)")
- edict = {dropped_event_id: dropped_event}
+ edict = {"dropped": dropped_event}
+ idtoname = {dropped_event_id: "dropped"}
+
+ for event in events:
+ edict[event.name] = event
- for num, event in enumerate(events):
- edict[num] = event
+ # If there is no header assume event ID mapping matches events list
+ if not read_header:
+ for event_id, event in enumerate(events):
+ idtoname[event_id] = event.name
def build_fn(analyzer, event):
if isinstance(event, str):
fn_argcount = len(inspect.getargspec(fn)[0]) - 1
if fn_argcount == event_argcount + 1:
# Include timestamp as first argument
- return lambda _, rec: fn(*((rec[1:2],) + rec[3:3 + event_argcount]))
+ return lambda _, rec: fn(*(rec[1:2] + rec[3:3 + event_argcount]))
elif fn_argcount == event_argcount + 2:
# Include timestamp and pid
return lambda _, rec: fn(*rec[1:3 + event_argcount])
analyzer.begin()
fn_cache = {}
- for rec in read_trace_records(edict, log):
+ for rec in read_trace_records(edict, idtoname, log):
event_num = rec[0]
event = edict[event_num]
if event_num not in fn_cache:
'<trace-file>\n' % sys.argv[0])
sys.exit(1)
- events = _read_events(open(sys.argv[1], 'r'))
+ events = read_events(open(sys.argv[1], 'r'), sys.argv[1])
process(events, sys.argv[2], analyzer, read_header=read_header)
if __name__ == '__main__':
projects / qemu.git / blobdiff