4 # Babeltrace example script with sched_switch events
6 # Copyright 2012 EfficiOS Inc.
8 # Author: Danny Serres <danny.serres@efficios.com>
10 # Permission is hereby granted, free of charge, to any person obtaining a copy
11 # of this software and associated documentation files (the "Software"), to deal
12 # in the Software without restriction, including without limitation the rights
13 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 # copies of the Software, and to permit persons to whom the Software is
15 # furnished to do so, subject to the following conditions:
17 # The above copyright notice and this permission notice shall be included in
18 # all copies or substantial portions of the Software.
20 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
28 # The script takes one optional argument (pid)
29 # The script will read events based on pid and
30 # print the scheduler switches happening with the process.
31 # If no arguments are passed, it displays all the scheduler switches.
32 # This can be used to understand which tasks schedule out the current
33 # process being traced, and when it gets scheduled in again.
34 # The trace needs PID context (lttng add-context -k -t pid)
37 import babeltrace
.reader
38 import babeltrace
.common
41 if len(sys
.argv
) < 2 or len(sys
.argv
) > 3:
42 raise TypeError("Usage: python sched_switch.py [pid] path/to/trace")
43 elif len(sys
.argv
) == 3:
48 traces
= babeltrace
.reader
.TraceCollection()
49 ret
= traces
.add_trace(sys
.argv
[len(sys
.argv
) - 1], "ctf")
51 raise IOError("Error adding trace")
53 for event
in traces
.events
:
54 if event
.name
!= "sched_switch":
58 pid
= event
.field_with_scope("pid", babeltrace
.common
.CTFScope
.STREAM_EVENT_CONTEXT
)
60 print("ERROR: Missing PID info for sched_switch")
63 if filterPID
and (pid
!= long(sys
.argv
[1])):
66 prev_comm
= event
["prev_comm"]
67 prev_tid
= event
["prev_tid"]
68 prev_prio
= event
["prev_prio"]
69 prev_state
= event
["prev_state"]
70 next_comm
= event
["next_comm"]
71 next_tid
= event
["next_tid"]
72 next_prio
= event
["next_prio"]
75 print("sched_switch, pid = {}, TS = {}, prev_comm = {},\n\t"
76 "prev_tid = {}, prev_prio = {}, prev_state = {},\n\t"
77 "next_comm = {}, next_tid = {}, next_prio = {}".format(
78 pid
, event
.timestamp
, prev_comm
, prev_tid
,
79 prev_prio
, prev_state
, next_comm
, next_tid
, next_prio
))
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