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Use lttng built from source as a workaround

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This commit is contained in:
Christophe Bedard 2019-06-06 09:24:16 +02:00
parent 182fc771ee
commit 031f30460a
2 changed files with 23 additions and 19 deletions
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7
trace.py
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@ -12,11 +12,10 @@ def main(argv=sys.argv):
exit(1)
session_name = argv[1]
path = argv[2]
# TODO fix kernel tracing
lttng_setup(session_name, path, kernel_events=None)
path = argv[2] + '/' + session_name
lttng_setup(session_name, path)
lttng_start(session_name)
print('tracing session started')
print(f'tracing session started: {path}')
# TODO integrate this with launch + ROS shutdown
input('press enter to stop...')

35
tracing/lttng.py
View file

@ -1,13 +1,17 @@
# LTTng tracing interface
# Temporary workaround
import sys
sys.path = ['/usr/local/lib/python3.6/site-packages'] + sys.path
from lttng import *
from .names import DEFAULT_EVENTS_ROS, DEFAULT_EVENTS_KERNEL, DEFAULT_CONTEXT
def lttng_setup(session_name, path, ros_events=DEFAULT_EVENTS_ROS, kernel_events=DEFAULT_EVENTS_KERNEL, context_names=DEFAULT_CONTEXT):
def lttng_setup(session_name, directory, ros_events=DEFAULT_EVENTS_ROS, kernel_events=DEFAULT_EVENTS_KERNEL, context_names=DEFAULT_CONTEXT):
"""
Setup LTTng session, with events and context
:param session_name (str): the name of the session
:param path (str): the path to write trace data to
:param directory (str): the path of the main directory to write trace data to
:param ros_events (list(str)): list of ROS events to enable
:param kernel_events (list(str)): list of kernel events to enable
:param context_names (list(str)): list of context elements to enable
@ -21,10 +25,11 @@ def lttng_setup(session_name, path, ros_events=DEFAULT_EVENTS_ROS, kernel_events
if ust_enabled:
domain_ust = Domain()
domain_ust.type = DOMAIN_UST
domain_ust.buf_type = BUFFER_PER_UID
channel_ust = Channel()
channel_ust.name = 'ros2'
channel_ust.attr.overwrite = 0
channel_ust.attr.subbuf_size = 4096
channel_ust.attr.subbuf_size = 2*4096
channel_ust.attr.num_subbuf = 8
channel_ust.attr.switch_timer_interval = 0
channel_ust.attr.read_timer_interval = 200
@ -33,19 +38,19 @@ def lttng_setup(session_name, path, ros_events=DEFAULT_EVENTS_ROS, kernel_events
if kernel_enabled:
domain_kernel = Domain()
domain_kernel.type = DOMAIN_KERNEL
domain_kernel.buf_type = BUFFER_GLOBAL
channel_kernel = Channel()
channel_kernel.name = 'kchan'
# TODO fix kernel tracing
# channel_kernel.attr.overwrite = 0
# channel_kernel.attr.subbuf_size = 4096
# channel_kernel.attr.num_subbuf = 8
# channel_kernel.attr.switch_timer_interval = 0
# channel_kernel.attr.read_timer_interval = 200
# channel_kernel.attr.output = EVENT_MMAP
channel_kernel.attr.overwrite = 0
channel_kernel.attr.subbuf_size = 8*4096
channel_kernel.attr.num_subbuf = 8
channel_kernel.attr.switch_timer_interval = 0
channel_kernel.attr.read_timer_interval = 200
channel_kernel.attr.output = EVENT_MMAP
events_list_kernel = _create_events(kernel_events)
# Session
_create_session(session_name, path)
_create_session(session_name, directory)
# Handles, channels, events
handle_ust = None
@ -101,17 +106,17 @@ def _create_events(event_names_list):
events_list.append(e)
return events_list
def _create_session(session_name, path):
def _create_session(session_name, directory):
"""
Create session from name and path, and check for errors
Create session from name and directory path, and check for errors
"""
result = create(session_name, path)
result = create(session_name, directory)
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
lttng_destroy(session_name)
result = create(session_name, path)
result = create(session_name, directory)
if result < 0:
raise RuntimeError(f'session creation failed: {strerror(result)}')