1 Intel Branch Trace Store
2 ========================
3
4 Overview
5 ========
6
7 Intel BTS could be regarded as a predecessor t
8 similarities because it can also identify ever
9 notable difference is that Intel BTS has no ti
10 consequence the present implementation is limi
11
12 While decoding Intel BTS does not require walk
13 code is still needed to pair up calls and retu
14 of the Intel PT documentation applies also to
15 documentation and consider that the PMU 'intel
16 place of 'intel_pt' in the examples provided,
17 recording must also be stipulated i.e. the --p
18 'perf record'.
19
20
21 perf record
22 ===========
23
24 new event
25 ---------
26
27 The Intel BTS kernel driver creates a new PMU
28 option is:
29
30 -e intel_bts//
31
32 Currently Intel BTS is limited to per-thread t
33 is also needed.
34
35
36 snapshot option
37 ---------------
38
39 The snapshot option is the same as Intel PT (r
40
41
42 auxtrace mmap size option
43 -----------------------
44
45 The mmap size option is the same as Intel PT (
46
47
48 perf script
49 ===========
50
51 By default, perf script will decode trace data
52 This can be further controlled by option --itr
53 the same as Intel PT (refer Intel PT documenta
54 "instructions" events nor "transactions" event
55 chains) are supported.
56
57 To disable trace decoding entirely, use the op
58
59
60 dump option
61 -----------
62
63 perf script has an option (-D) to "dump" the e
64 data.
65
66 When -D is used, Intel BTS packets are display
67
68 To disable the display of Intel BTS packets, c
69 --no-itrace.
70
71
72 perf report
73 ===========
74
75 By default, perf report will decode trace data
76 This can be further controlled by new option -
77 perf script.
78
79
80 perf inject
81 ===========
82
83 perf inject also accepts the --itrace option i
84 removed and replaced with the synthesized even
85
86 perf inject --itrace -i perf.data -o p
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