Add 'tracetools_trace/' from commit '29b1c6d50b'

git-subtree-dir: tracetools_trace
git-subtree-mainline: 4d434fa182
git-subtree-split: 29b1c6d50b

tracetools_trace/tracetools_trace/tools/args.py

@@ -0,0 +1,51 @@
+import argparse
+import time
+
+from . import names
+
+
+class DefaultArgValueCompleter:
+    """Callable returning an arg's default value."""
+
+    def __init__(self, arg):
+        default = arg.default
+        self.list = default if isinstance(default, list) else [default]
+
+    def __call__(self, **kwargs):
+        return self.list
+
+
+def parse_args():
+    """
+    Parse args for tracing.
+    """
+    parser = argparse.ArgumentParser(description='Setup and launch an LTTng tracing session.')
+    add_arguments(parser)
+    return parser.parse_args()
+
+
+def add_arguments(parser):
+    parser.add_argument(
+        '--session-name', '-s', dest='session_name',
+        default=f'session-{time.strftime("%Y%m%d%H%M%S")}',
+        help='the name of the tracing session (default: session-YYYYMMDDHHMMSS)')
+    parser.add_argument(
+        '--path', '-p', dest='path',
+        default='/tmp',
+        help='path of the base directory for trace data (default: %(default)s)')
+    arg = parser.add_argument(
+        '--ust', '-u', nargs='*', dest='events_ust', default=names.DEFAULT_EVENTS_ROS,
+        help='the ROS UST events to enable (default: all events) '
+            '[to disable all UST events, '
+            'provide this flag without any event name]')
+    arg.completer = DefaultArgValueCompleter(arg)
+    arg = parser.add_argument(
+        '--kernel', '-k', nargs='*', dest='events_kernel',
+        default=names.DEFAULT_EVENTS_KERNEL,
+        help='the kernel events to enable (default: all events) '
+            '[to disable all UST events, '
+            'provide this flag without any event name]')
+    arg.completer = DefaultArgValueCompleter(arg)
+    parser.add_argument(
+        '--list', '-l', dest='list', action='store_true',
+        help='display lists of enabled events (default: %(default)s)')

tracetools_trace/tracetools_trace/tools/lttng.py

@@ -0,0 +1,278 @@
+# LTTng tracing interface
+
+import sys
+
+# Temporary workaround
+sys.path = ['/usr/local/lib/python3.6/site-packages'] + sys.path
+from typing import List
+
+import lttng  # noqa: E402
+
+from .names import (  # noqa: E402
+    DEFAULT_CONTEXT,
+    DEFAULT_EVENTS_KERNEL,
+    DEFAULT_EVENTS_ROS,
+)
+
+
+def lttng_init(
+    session_name: str,
+    full_path: str,
+    ros_events: List[str] = DEFAULT_EVENTS_ROS,
+    kernel_events: List[str] = DEFAULT_EVENTS_KERNEL,
+    context_names: List[str] = DEFAULT_CONTEXT
+) -> None:
+    """
+    Set up and start LTTng session.
+
+    :param session_name: the name of the session
+    :param full_path: the full path to the main directory to write trace data to
+    :param ros_events: list of ROS events to enable
+    :param kernel_events: list of kernel events to enable
+    :param context_names: list of context elements to enable
+    """
+    _lttng_setup(session_name, full_path, ros_events, kernel_events, context_names)
+    _lttng_start(session_name)
+
+
+def lttng_fini(session_name: str) -> None:
+    """
+    Stop and destroy LTTng session.
+
+    :param session_name: the name of the session
+    """
+    _lttng_stop(session_name)
+    _lttng_destroy(session_name)
+
+
+def _lttng_setup(
+        session_name: str,
+        full_path: str,
+        ros_events: List[str] = DEFAULT_EVENTS_ROS,
+        kernel_events: List[str] = DEFAULT_EVENTS_KERNEL,
+        context_names: List[str] = DEFAULT_CONTEXT
+    ) -> None:
+    """
+    Set up LTTng session, with events and context.
+
+    :param session_name: the name of the session
+    :param full_path: the full path to the main directory to write trace data to
+    :param ros_events: list of ROS events to enable
+    :param kernel_events: list of kernel events to enable
+    :param context_names: list of context elements to enable
+    """
+    ust_enabled = ros_events is not None and len(ros_events) > 0
+    kernel_enabled = kernel_events is not None and len(kernel_events) > 0
+
+    # Domains
+    if ust_enabled:
+        domain_ust = lttng.Domain()
+        domain_ust.type = lttng.DOMAIN_UST
+        domain_ust.buf_type = lttng.BUFFER_PER_UID
+        channel_ust = lttng.Channel()
+        channel_ust.name = 'ros2'
+        channel_ust.attr.overwrite = 0
+        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
+        channel_ust.attr.output = lttng.EVENT_MMAP
+        events_list_ust = _create_events(ros_events)
+    if kernel_enabled:
+        domain_kernel = lttng.Domain()
+        domain_kernel.type = lttng.DOMAIN_KERNEL
+        domain_kernel.buf_type = lttng.BUFFER_GLOBAL
+        channel_kernel = lttng.Channel()
+        channel_kernel.name = 'kchan'
+        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 = lttng.EVENT_MMAP
+        events_list_kernel = _create_events(kernel_events)
+
+    # Session
+    _create_session(session_name, full_path)
+
+    # Handles, channels, events
+    handle_ust = None
+    if ust_enabled:
+        handle_ust = _create_handle(session_name, domain_ust)
+        _enable_channel(handle_ust, channel_ust)
+        _enable_events(handle_ust, events_list_ust, channel_ust.name)
+    handle_kernel = None
+    if kernel_enabled:
+        handle_kernel = _create_handle(session_name, domain_kernel)
+        _enable_channel(handle_kernel, channel_kernel)
+        _enable_events(handle_kernel, events_list_kernel, channel_kernel.name)
+
+    # Context
+    context_list = _create_context_list(context_names)
+    enabled_handles = [h for h in [handle_ust, handle_kernel] if h is not None]
+    _add_context(enabled_handles, context_list)
+
+
+def _lttng_start(session_name: str) -> None:
+    """
+    Start LTTng session, and check for errors.
+
+    :param session_name: the name of the session
+    """
+    result = lttng.start(session_name)
+    if result < 0:
+        raise RuntimeError(f'failed to start tracing: {lttng.strerror(result)}')
+
+
+def _lttng_stop(session_name: str) -> None:
+    """
+    Stop LTTng session, and check for errors.
+
+    :param session_name: the name of the session
+    """
+    result = lttng.stop(session_name)
+    if result < 0:
+        raise RuntimeError(f'failed to stop tracing: {lttng.strerror(result)}')
+
+
+def _lttng_destroy(session_name: str) -> None:
+    """
+    Destroy LTTng session, and check for errors.
+
+    :param session_name: the name of the session
+    """
+    result = lttng.destroy(session_name)
+    if result < 0:
+        raise RuntimeError(f'failed to destroy tracing session: {lttng.strerror(result)}')
+
+
+def _create_events(event_names_list: List[str]) -> List[lttng.Event]:
+    """
+    Create events list from names.
+
+    :param event_names_list: a list of names to create events for
+    :return: the list of events
+    """
+    events_list = []
+    for event_name in event_names_list:
+        e = lttng.Event()
+        e.name = event_name
+        e.type = lttng.EVENT_TRACEPOINT
+        e.loglevel_type = lttng.EVENT_LOGLEVEL_ALL
+        events_list.append(e)
+    return events_list
+
+
+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
+        lttng_destroy(session_name)
+        result = lttng.create(session_name, full_path)
+    if result < 0:
+        raise RuntimeError(f'session creation failed: {lttng.strerror(result)}')
+
+
+def _create_handle(session_name: str, domain: lttng.Domain) -> lttng.Handle:
+    """
+    Create a handle for a given session name and a domain, and check for errors.
+
+    :param session_name: the name of the session
+    :param domain: the domain to be used
+    :return: the handle
+    """
+    handle = None
+    handle = lttng.Handle(session_name, domain)
+    if handle is None:
+        raise RuntimeError('handle creation failed')
+    return handle
+
+
+def _enable_channel(handle: lttng.Handle, channel: lttng.Channel) -> None:
+    """
+    Enable channel for a handle, and check for errors.
+
+    :param handle: the handle to be used
+    :param channel: the channel to enable
+    """
+    result = lttng.enable_channel(handle, channel)
+    if result < 0:
+        raise RuntimeError(f'channel enabling failed: {lttng.strerror(result)}')
+
+
+def _enable_events(
+    handle: lttng.Handle,
+    events_list: List[lttng.Event],
+    channel_name: str,
+) -> None:
+    """
+    Enable events list for a given handle and channel name, and check for errors.
+
+    :param handle: the handle to be used
+    :param events_list: the list of events to enable
+    :param channel_name: the name of the channel to associate
+    """
+    for event in events_list:
+        result = lttng.enable_event(handle, event, channel_name)
+        if result < 0:
+            raise RuntimeError(f'event enabling failed: {lttng.strerror(result)}')
+
+
+context_map = {
+    'procname': lttng.EVENT_CONTEXT_PROCNAME,
+    'pid': lttng.EVENT_CONTEXT_PID,
+    'vpid': lttng.EVENT_CONTEXT_VPID,
+    'vtid': lttng.EVENT_CONTEXT_VTID,
+}
+
+
+def _context_name_to_type(context_name: str) -> int:
+    """
+    Convert from context name to LTTng enum/constant type.
+
+    :param context_name: the generic name for the context
+    :return: the associated type
+    """
+    return context_map.get(context_name)
+
+
+def _create_context_list(context_names_list: List[str]) -> List[lttng.EventContext]:
+    """
+    Create context list from names, and check for errors.
+
+    :param context_names_list: the list of context names
+    :return: the event context list
+    """
+    context_list = []
+    for c in context_names_list:
+        ec = lttng.EventContext()
+        context_type = _context_name_to_type(c)
+        if context_type is not None:
+            ec.ctx = context_type
+            context_list.append(ec)
+    return context_list
+
+
+def _add_context(
+    handles: List[lttng.Handle],
+    context_list: List[lttng.EventContext],
+) -> None:
+    """
+    Add context list to given handles, and check for errors.
+
+    :param handles: the list of handles for which to add context
+    :param context_list: the list of event contexts to add to the handles
+    """
+    for handle in handles:
+        for contex in context_list:
+            result = lttng.add_context(handle, contex, None, None)
+            if result < 0:
+                raise RuntimeError(f'failed to add context: {lttng.strerror(result)}')

tracetools_trace/tracetools_trace/tools/names.py

@@ -0,0 +1,60 @@
+# Lists of names (events, context)
+
+DEFAULT_EVENTS_KERNEL = [
+    'block_rq_complete',
+    'block_rq_insert',
+    'block_rq_issue',
+    'block_bio_frontmerge',
+    'irq_softirq_entry',
+    'irq_softirq_raise',
+    'irq_softirq_exit',
+    'irq_handler_entry',
+    'irq_handler_exit',
+    'lttng_statedump_process_state',
+    'lttng_statedump_start',
+    'lttng_statedump_end',
+    'lttng_statedump_network_interface',
+    'lttng_statedump_block_device',
+    'net_dev_queue',
+    'netif_receive_skb',
+    'net_if_receive_skb',
+    'power_cpu_frequency',
+    'sched_switch',
+    'sched_waking',
+    'sched_pi_setprio',
+    'sched_process_fork',
+    'sched_process_exit',
+    'sched_process_free',
+    'sched_wakeup',
+    'sched_migrate',
+    'sched_migrate_task',
+    'timer_hrtimer_start',
+    'timer_hrtimer_cancel',
+    'timer_hrtimer_expire_entry',
+    'timer_hrtimer_expire_exit',
+]
+
+DEFAULT_EVENTS_ROS = [
+    'ros2:rcl_init',
+    'ros2:rcl_node_init',
+    'ros2:rcl_publisher_init',
+    'ros2:rcl_subscription_init',
+    'ros2:rclcpp_subscription_callback_added',
+    'ros2:rcl_service_init',
+    'ros2:rclcpp_service_callback_added',
+    'ros2:rcl_client_init',
+    'ros2:rcl_timer_init',
+    'ros2:rclcpp_timer_callback_added',
+    'ros2:rclcpp_callback_register',
+    'ros2:callback_start',
+    'ros2:callback_end',
+]
+
+DEFAULT_CONTEXT = [
+    'procname',
+    'perf:thread:instructions',
+    'perf:thread:cycles',
+    'perf:thread:cpu-cycles',
+    'vpid',
+    'vtid',
+]

tracetools_trace/tracetools_trace/trace.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# Entrypoint/script to setup and start an LTTng tracing session
+
+import os
+
+from tracetools_trace.tools import args
+from tracetools_trace.tools import lttng
+from tracetools_trace.tools import names
+
+
+def main():
+    params = args.parse_args()
+
+    session_name = params.session_name
+    base_path = params.path
+    full_path = os.path.join(base_path, session_name)
+    ros_events = params.events_ust
+    kernel_events = params.events_kernel
+
+    ust_enabled = len(ros_events) > 0
+    kernel_enabled = len(kernel_events) > 0
+    if ust_enabled:
+        print(f'UST tracing enabled ({len(ros_events)} events)')
+        if params.list:
+            print(f'\tevents: {ros_events}')
+    else:
+        print('UST tracing disabled')
+    if kernel_enabled:
+        print(f'kernel tracing enabled ({len(kernel_events)} events)')
+        if params.list:
+            print(f'\tevents: {kernel_events}')
+    else:
+        print('kernel tracing disabled')
+
+    print(f'writting tracing session to: {full_path}')
+    input('press enter to start...')
+    lttng.lttng_init(session_name, full_path, ros_events=ros_events, kernel_events=kernel_events)
+    input('press enter to stop...')
+
+    print('stopping & destroying tracing session')
+    lttng.lttng_fini(session_name)