Move Python bindings to babeltrace subfolder

[babeltrace.git] / bindings / python / babeltrace / examples / sched_switch.py

diff --git a/bindings/python/babeltrace/examples/sched_switch.py b/bindings/python/babeltrace/examples/sched_switch.py
new file mode 100644 (file)
index 0000000..8c47556
--- /dev/null
+++ b/bindings/python/babeltrace/examples/sched_switch.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+# sched_switch.py
+#
+# Babeltrace example script with sched_switch events
+#
+# Copyright 2012 EfficiOS Inc.
+#
+# Author: Danny Serres <danny.serres@efficios.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# The script takes one optional argument (pid)
+# The script will read events based on pid and
+# print the scheduler switches happening with the process.
+# If no arguments are passed, it displays all the scheduler switches.
+# This can be used to understand which tasks schedule out the current
+# process being traced, and when it gets scheduled in again.
+# The trace needs PID context (lttng add-context -k -t pid)
+
+import sys
+from babeltrace import *
+
+if len(sys.argv) < 2 or len(sys.argv) > 3:
+       raise TypeError("Usage: python sched_switch.py [pid] path/to/trace")
+elif len(sys.argv) == 3:
+       filterPID = True
+else:
+       filterPID = False
+
+traces = TraceCollection()
+ret = traces.add_trace(sys.argv[len(sys.argv)-1], "ctf")
+if ret is None:
+       raise IOError("Error adding trace")
+
+for event in traces.events:
+       if event.name != "sched_switch":
+               continue
+
+       # Getting PID
+       pid = event.field_with_scope("pid", CTFScope.STREAM_EVENT_CONTEXT)
+       if pid is None:
+               print("ERROR: Missing PID info for sched_switch")
+               continue # Next event
+
+       if filterPID and (pid != long(sys.argv[1])):
+               continue # Next event
+
+       prev_comm = event["prev_comm"]
+       prev_tid = event["prev_tid"]
+       prev_prio = event["prev_prio"]
+       prev_state = event["prev_state"]
+       next_comm = event["next_comm"]
+       next_tid = event["next_tid"]
+       next_prio = event["next_prio"]
+
+       # Output
+       print("sched_switch, pid = {}, TS = {}, prev_comm = {},\n\t"
+               "prev_tid = {}, prev_prio = {}, prev_state = {},\n\t"
+               "next_comm = {}, next_tid = {}, next_prio = {}".format(
+               pid, event.timestamp, prev_comm, prev_tid,
+               prev_prio, prev_state, next_comm, next_tid, next_prio))