diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-21 12:05:47 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-21 12:05:47 -0400 |
commit | bd4c3a3441144cd46d1f544046523724c5bc6e94 (patch) | |
tree | 8b5c67249a7a163caf3f88cbcb9df5236fcc3b93 /Documentation | |
parent | b3727c24da69971503a4ca98b3b877753c6a4393 (diff) | |
parent | 583a22e7c154dc0a3938db522696b4bc7f098f59 (diff) |
Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_file
tracing: Export trace_profile_buf symbols
tracing/events: use list_for_entry_continue
tracing: remove max_tracer_type_len
function-graph: use ftrace_graph_funcs directly
tracing: Remove markers
tracing: Allocate the ftrace event profile buffer dynamically
tracing: Factorize the events profile accounting
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/markers.txt | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/Documentation/markers.txt b/Documentation/markers.txt deleted file mode 100644 index d2b3d0e91b26..000000000000 --- a/Documentation/markers.txt +++ /dev/null | |||
@@ -1,104 +0,0 @@ | |||
1 | Using the Linux Kernel Markers | ||
2 | |||
3 | Mathieu Desnoyers | ||
4 | |||
5 | |||
6 | This document introduces Linux Kernel Markers and their use. It provides | ||
7 | examples of how to insert markers in the kernel and connect probe functions to | ||
8 | them and provides some examples of probe functions. | ||
9 | |||
10 | |||
11 | * Purpose of markers | ||
12 | |||
13 | A marker placed in code provides a hook to call a function (probe) that you can | ||
14 | provide at runtime. A marker can be "on" (a probe is connected to it) or "off" | ||
15 | (no probe is attached). When a marker is "off" it has no effect, except for | ||
16 | adding a tiny time penalty (checking a condition for a branch) and space | ||
17 | penalty (adding a few bytes for the function call at the end of the | ||
18 | instrumented function and adds a data structure in a separate section). When a | ||
19 | marker is "on", the function you provide is called each time the marker is | ||
20 | executed, in the execution context of the caller. When the function provided | ||
21 | ends its execution, it returns to the caller (continuing from the marker site). | ||
22 | |||
23 | You can put markers at important locations in the code. Markers are | ||
24 | lightweight hooks that can pass an arbitrary number of parameters, | ||
25 | described in a printk-like format string, to the attached probe function. | ||
26 | |||
27 | They can be used for tracing and performance accounting. | ||
28 | |||
29 | |||
30 | * Usage | ||
31 | |||
32 | In order to use the macro trace_mark, you should include linux/marker.h. | ||
33 | |||
34 | #include <linux/marker.h> | ||
35 | |||
36 | And, | ||
37 | |||
38 | trace_mark(subsystem_event, "myint %d mystring %s", someint, somestring); | ||
39 | Where : | ||
40 | - subsystem_event is an identifier unique to your event | ||
41 | - subsystem is the name of your subsystem. | ||
42 | - event is the name of the event to mark. | ||
43 | - "myint %d mystring %s" is the formatted string for the serializer. "myint" and | ||
44 | "mystring" are repectively the field names associated with the first and | ||
45 | second parameter. | ||
46 | - someint is an integer. | ||
47 | - somestring is a char pointer. | ||
48 | |||
49 | Connecting a function (probe) to a marker is done by providing a probe (function | ||
50 | to call) for the specific marker through marker_probe_register() and can be | ||
51 | activated by calling marker_arm(). Marker deactivation can be done by calling | ||
52 | marker_disarm() as many times as marker_arm() has been called. Removing a probe | ||
53 | is done through marker_probe_unregister(); it will disarm the probe. | ||
54 | |||
55 | marker_synchronize_unregister() must be called between probe unregistration and | ||
56 | the first occurrence of | ||
57 | - the end of module exit function, | ||
58 | to make sure there is no caller left using the probe; | ||
59 | - the free of any resource used by the probes, | ||
60 | to make sure the probes wont be accessing invalid data. | ||
61 | This, and the fact that preemption is disabled around the probe call, make sure | ||
62 | that probe removal and module unload are safe. See the "Probe example" section | ||
63 | below for a sample probe module. | ||
64 | |||
65 | The marker mechanism supports inserting multiple instances of the same marker. | ||
66 | Markers can be put in inline functions, inlined static functions, and | ||
67 | unrolled loops as well as regular functions. | ||
68 | |||
69 | The naming scheme "subsystem_event" is suggested here as a convention intended | ||
70 | to limit collisions. Marker names are global to the kernel: they are considered | ||
71 | as being the same whether they are in the core kernel image or in modules. | ||
72 | Conflicting format strings for markers with the same name will cause the markers | ||
73 | to be detected to have a different format string not to be armed and will output | ||
74 | a printk warning which identifies the inconsistency: | ||
75 | |||
76 | "Format mismatch for probe probe_name (format), marker (format)" | ||
77 | |||
78 | Another way to use markers is to simply define the marker without generating any | ||
79 | function call to actually call into the marker. This is useful in combination | ||
80 | with tracepoint probes in a scheme like this : | ||
81 | |||
82 | void probe_tracepoint_name(unsigned int arg1, struct task_struct *tsk); | ||
83 | |||
84 | DEFINE_MARKER_TP(marker_eventname, tracepoint_name, probe_tracepoint_name, | ||
85 | "arg1 %u pid %d"); | ||
86 | |||
87 | notrace void probe_tracepoint_name(unsigned int arg1, struct task_struct *tsk) | ||
88 | { | ||
89 | struct marker *marker = &GET_MARKER(kernel_irq_entry); | ||
90 | /* write data to trace buffers ... */ | ||
91 | } | ||
92 | |||
93 | * Probe / marker example | ||
94 | |||
95 | See the example provided in samples/markers/src | ||
96 | |||
97 | Compile them with your kernel. | ||
98 | |||
99 | Run, as root : | ||
100 | modprobe marker-example (insmod order is not important) | ||
101 | modprobe probe-example | ||
102 | cat /proc/marker-example (returns an expected error) | ||
103 | rmmod marker-example probe-example | ||
104 | dmesg | ||