def start_tracing_binding(tracename, tracepoints = None):
os.remove('lttng.out')
lttng.create(tracename, "/home/mogeb/git/benchtrace/trace-client")
domain = lttng.Domain()
domain.type = lttng.DOMAIN_KERNEL
handle = lttng.Handle(tracename, domain)
lttng.channel_set_default_attr
lttng.list_tracepoints(handle)
event = lttng.Event()
event.name = 'empty_ioctl_1b'
#event.name = 'getuid'
#event.type = lttng.EVENT_SYSCALL
lttng.enable_event(handle, event, None)
lttng.start(tracename)
def _create_session(session_name: str, full_path: str) -> None:
"""
Create session from name and full directory path, and check for errors.
:param session_name: the name of the session
:param full_path: the full path to the main directory to write trace data to
"""
result = lttng.create(session_name, full_path)
LTTNG_ERR_EXIST_SESS = 28
if result == -LTTNG_ERR_EXIST_SESS:
# Sessions seem to persist, so if it already exists,
# just destroy it and try again
destroy(session_name)
result = lttng.create(session_name, full_path)
if result < 0:
raise RuntimeError(
f'session creation failed: {lttng.strerror(result)}')
def _create_session(
session_name: str,
full_path: str,
) -> None:
"""
Create session from name and full directory path, and check for errors.
:param session_name: the name of the session
:param full_path: the full path to the main directory to write trace data to
"""
result = lttng.create(session_name, full_path)
# See lttng-tools/include/lttng/lttng-error.h
if -28 == result:
# Sessions seem to persist, so if it already exists,
# just destroy it and try again
destroy(session_name=session_name)
result = lttng.create(session_name, full_path)
if result < 0:
raise RuntimeError(
f'session creation failed: {lttng.strerror(result)}')
def __init__(self, sess_type, **kwargs):
self.name = 'untitled_'+sess_type if kwargs.get('name')==None else kwargs.get('name')
self.path = '/lttng-traces/'+self.name if kwargs.get('path')==None else kwargs.get('path')+'/'+self.name
# Making sure session does not already exist
lttng.destroy(self.name)
#Creating LTTng session domain
self.domain = lttng.Domain()
if sess_type=='kernel':
self.domain.type = lttng.DOMAIN_KERNEL
elif sess_type=='ust':
self.domain.type = lttng.DOMAIN_UST
else:
print("invalid tracing session type '%r', session not created" %(sess_type))
#Enabling channel
self.channel = lttng.Channel()
self.channel.name="channel_1"
self.channel.attr.overwrite = 0
self.channel.attr.subbuf_size = 4096
self.channel.attr.num_subbuf = 8
self.channel.attr.switch_timer_interval = 0
self.channel.attr.read_timer_interval = 200
self.channel.attr.output = lttng.EVENT_MMAP
#creating handle
self.handle = None
self.handle = lttng.Handle(self.name, self.domain)
if self.handle is None:
raise LTTngError("Handle not created")
#creating session
ret = lttng.create(self.name,self.path)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
#enabling channel on handle
lttng.enable_channel(self.handle, self.channel)
# Enabling all events
self.event = lttng.Event()
self.event.type = lttng.EVENT_ALL
self.event.loglevel_type = lttng.EVENT_LOGLEVEL_ALL
print
ret = lttng.enable_event(self.handle, self.event, self.channel.name)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
def _start_session(self):
def make_event(nm):
ev = lttng.Event()
ev.name = nm
ev.type = lttng.EVENT_TRACEPOINT
ev.loglevel = lttng.EVENT_LOGLEVEL_ALL
return ev
events = (make_event(nm=name) for name in self.trace_events)
r = lttng.create(name=self.sess_name, path=self.outdir)
if r < 0:
raise Exception("lttng.create({nm}) return code {code}".format(
nm=self.sess_name, code=r))
for ev in events:
r = lttng.enable_event(handle=self.handle,
event=ev,
channel_name=None)
if r < 0:
raise Exception(
"lttng.enable_event({nm}) return code {code}".format(
nm=ev.name, code=r))
# Errors to raise if something goes wrong
class LTTngError(Exception):
pass
class BabeltraceError(Exception):
pass
# LTTNG-TOOLS
# Making sure session does not already exist
lttng.destroy(ses_name)
# Creating a new session and handle
ret = lttng.create(ses_name, trace_path)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
domain = lttng.Domain()
domain.type = lttng.DOMAIN_KERNEL
han = None
han = lttng.Handle(ses_name, domain)
if han is None:
raise LTTngError("Handle not created")
# Enabling all events
event = lttng.Event()
event.type = lttng.EVENT_ALL
event.loglevel_type = lttng.EVENT_LOGLEVEL_ALL
def lttng_session(session_name, command, names, analyzer):
ts = datetime.datetime.fromtimestamp(time.time()).strftime('%Y-%m-%d-%H-%M-%S-%f')
tracedir = os.environ['HOME'] + "/lttng-traces/" + session_name + "-" + ts
print('Writing trace to ' + tracedir)
lttng.destroy(session_name)
res = lttng.create(session_name, tracedir)
if res<0:
raise Exception("Failed to create lttng session")
dom = lttng.Domain()
dom.type = lttng.DOMAIN_UST
han = None
han = lttng.Handle(session_name, dom)
if han is None:
raise Exception("Handle not created")
channel = lttng.Channel()
channel.name = "channel0"
channel.attr.overwrite = 0
channel.attr.subbuf_size = 1048576
channel.attr.num_subbuf = 8
channel.attr.switch_timer_interval = 0
channel.attr.read_timer_interval = 0
channel.attr.output = lttng.EVENT_MMAP
res = lttng.enable_channel(han, channel)
if res<0:
raise Exception("Failed to enable channel")
for n in names:
# lttng enable-event -u 'memcached:*'
event = lttng.Event()
event.type = lttng.EVENT_TRACEPOINT
event.name = n
lttng.enable_event(han, event, "channel0")
os.system("lttng add-context -s" + session_name + " -u -t perf:thread:cycles -t pthread_id")
# ctx = lttng.EventContext()
# ctx.type = EVENT_CONTEXT_PTHREAD_ID
# res = lttng.add_context(han, ctx, None, None)
# assert res >= 0
#
# ctx.type = EVENT_CONTEXT_PERF_COUNTER
# ctx.u.perf_counter.name = "cpu-cycles"
# res = lttng.add_context(han, ctx, None, None)
# assert res >= 0
lttng.start(session_name)
print("running ", command)
os.system(command)
lttng.stop(session_name)
lttng.destroy(session_name)
subdir = subprocess.check_output(['ls', tracedir+'/ust/pid/']).decode("utf-8").rstrip()
babeldir = tracedir+'/ust/pid/'+subdir
print("analyzing trace in", babeldir)
col = babeltrace.TraceCollection()
if col.add_trace(babeldir, 'ctf') is None:
raise RuntimeError('Cannot add trace')
return analyzer(col)
# Errors to raise if something goes wrong
class LTTngError(Exception):
pass
class BabeltraceError(Exception):
pass
# LTTNG-TOOLS
# Making sure session does not already exist
lttng.destroy(ses_name)
# Creating a new session and handle
ret = lttng.create(ses_name, trace_path)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
domain = lttng.Domain()
domain.type = lttng.DOMAIN_KERNEL
han = None
han = lttng.Handle(ses_name, domain)
if han is None:
raise LTTngError("Handle not created")
# Enabling all events
event = lttng.Event()
event.type = lttng.EVENT_ALL
channel = lttng.Channel()
channel.name = "exp_chan"
channel.attr.overwrite = 0
channel.attr.subbuf_size = 4096
channel.attr.num_subbuf = 8
channel.attr.switch_timer_interval = 0
channel.attr.read_timer_interval = 200
channel.attr.output = lttng.EVENT_SPLICE
event = lttng.Event()
event.name = "sched_switch"
event.type = lttng.EVENT_TRACEPOINT
event.loglevel_type = lttng.EVENT_LOGLEVEL_ALL
ret = lttng.create(sess_name, trace_dest)
assert ret == 0
han = None
han = lttng.Handle(sess_name, dom)
assert han != None
lttng.enable_channel(han, channel)
lttng.enable_event(han, event, channel.name)
print(lttng.list_channels(han))
lttng.start(sess_name)
time.sleep(0.1)
lttng.stop(sess_name)
