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"""Convenience wrapper around mmap'ed sched_trace binary files.
"""
from .format import RECORD_LEN, unpack, get_event, EVENTS
import mmap
class SchedTraceFile(object):
def __init__(self, fname):
self.source = fname
with open(fname, 'rw') as f:
self.mem = mmap.mmap(f.fileno(), 0, mmap.MAP_PRIVATE)
def __len__(self):
return len(self.mem) / RECORD_LEN
def events_of_type(self, event_ids):
for i in xrange(len(self)):
if get_event(self.mem, i) in event_ids:
record = self.mem[i * RECORD_LEN:]
yield unpack(record)
def __iter__(self):
for i in xrange(len(self)):
record = self.mem[i * RECORD_LEN:]
yield unpack(record)
def __reversed__(self):
for i in reversed(xrange(len(self))):
record = self.mem[i * RECORD_LEN:]
yield unpack(record)
def raw_iter(self):
for i in xrange(len(self)):
record = self.mem[i * RECORD_LEN:(i + 1) * RECORD_LEN]
yield record
def scheduling_intervals(self):
to_id = EVENTS['ST_SWITCH_TO']
away_id = EVENTS['ST_SWITCH_AWAY']
# assumption: we are looking at a per-CPU trace
events = self.events_of_type(set((to_id, away_id)))
rec = events.next()
while True:
# fast-forward to next SWITCH_TO
while rec[0] != to_id:
rec = events.next()
to = rec
# next one on this CPU should be a SWITCH_AWAY
rec = events.next()
away = rec
# check for event ID and matching PID and CPU and monotonic time
if away[0] == away_id and away[1] == to[1] and away[2] == to[2] \
and to[4] <= away[4]:
yield (to, away)
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