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1 | # syscall_by_pid.py |
2 | # | |
3 | # Babeltrace syscall by pid example script | |
4 | # | |
5 | # Copyright 2012 EfficiOS Inc. | |
6 | # | |
7 | # Author: Danny Serres <danny.serres@efficios.com> | |
8 | # | |
9 | # Permission is hereby granted, free of charge, to any person obtaining a copy | |
10 | # of this software and associated documentation files (the "Software"), to deal | |
11 | # in the Software without restriction, including without limitation the rights | |
12 | # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
13 | # copies of the Software, and to permit persons to whom the Software is | |
14 | # furnished to do so, subject to the following conditions: | |
15 | # | |
16 | # The above copyright notice and this permission notice shall be included in | |
17 | # all copies or substantial portions of the Software. | |
18 | ||
19 | # The script checks the number of events in the trace | |
20 | # and outputs a table and a .svg histogram for the specified | |
21 | # range (microseconds) or the total trace if no range specified. | |
22 | # The graph is generated using the cairoplot module. | |
23 | ||
24 | # The script checks all syscall in the trace and prints a list | |
25 | # showing the number of systemcalls executed by each PID | |
26 | # ordered from greatest to least number of syscalls. | |
27 | # The trace needs PID context (lttng add-context -k -t pid) | |
28 | ||
29 | import sys | |
30 | from babeltrace import * | |
31 | from output_format_modules.pprint_table import pprint_table as pprint | |
32 | ||
33 | if len(sys.argv) < 2 : | |
34 | raise TypeError("Usage: python syscalls_by_pid.py path/to/trace") | |
35 | ||
36 | ctx = Context() | |
37 | ret = ctx.add_trace(sys.argv[1], "ctf") | |
38 | if ret is None: | |
39 | raise IOError("Error adding trace") | |
40 | ||
41 | data = {} | |
42 | ||
43 | # Setting iterator | |
44 | bp = IterPos(SEEK_BEGIN) | |
45 | ctf_it = ctf.Iterator(ctx, bp) | |
46 | ||
47 | # Reading events | |
48 | event = ctf_it.read_event() | |
49 | while event is not None: | |
50 | if event.get_name().find("sys") >= 0: | |
51 | # Getting scope definition | |
52 | sco = event.get_top_level_scope(ctf.scope.STREAM_EVENT_CONTEXT) | |
53 | if sco is None: | |
54 | print("ERROR: Cannot get definition scope for {}".format( | |
55 | event.get_name())) | |
56 | else: | |
57 | # Getting PID | |
58 | pid_field = event.get_field(sco, "_pid") | |
59 | pid = pid_field.get_int64() | |
60 | ||
61 | if ctf.field_error(): | |
62 | print("ERROR: Missing PID info for sched_switch".format( | |
63 | event.get_name())) | |
64 | elif pid in data: | |
65 | data[pid] += 1 | |
66 | else: | |
67 | data[pid] = 1 | |
68 | # Next event | |
69 | ret = ctf_it.next() | |
70 | if ret < 0: | |
71 | break | |
72 | event = ctf_it.read_event() | |
73 | ||
74 | del ctf_it | |
75 | ||
76 | # Setting table for output | |
77 | table = [] | |
78 | for item in data: | |
79 | table.append([data[item], item]) # [count, pid] | |
80 | table.sort(reverse = True) # [big count first, pid] | |
81 | for i in range(len(table)): | |
82 | table[i].reverse() # [pid, big count first] | |
83 | table.insert(0, ["PID", "SYSCALL COUNT"]) | |
84 | pprint(table) |