diff options
Diffstat (limited to 'Documentation/trace/tracepoints.txt')
| -rw-r--r-- | Documentation/trace/tracepoints.txt | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/Documentation/trace/tracepoints.txt b/Documentation/trace/tracepoints.txt index c0e1ceed75a4..da49437d5aeb 100644 --- a/Documentation/trace/tracepoints.txt +++ b/Documentation/trace/tracepoints.txt | |||
| @@ -81,7 +81,6 @@ tracepoint_synchronize_unregister() must be called before the end of | |||
| 81 | the module exit function to make sure there is no caller left using | 81 | the module exit function to make sure there is no caller left using |
| 82 | the probe. This, and the fact that preemption is disabled around the | 82 | the probe. This, and the fact that preemption is disabled around the |
| 83 | probe call, make sure that probe removal and module unload are safe. | 83 | probe call, make sure that probe removal and module unload are safe. |
| 84 | See the "Probe example" section below for a sample probe module. | ||
| 85 | 84 | ||
| 86 | The tracepoint mechanism supports inserting multiple instances of the | 85 | The tracepoint mechanism supports inserting multiple instances of the |
| 87 | same tracepoint, but a single definition must be made of a given | 86 | same tracepoint, but a single definition must be made of a given |
| @@ -100,17 +99,3 @@ core kernel image or in modules. | |||
| 100 | If the tracepoint has to be used in kernel modules, an | 99 | If the tracepoint has to be used in kernel modules, an |
| 101 | EXPORT_TRACEPOINT_SYMBOL_GPL() or EXPORT_TRACEPOINT_SYMBOL() can be | 100 | EXPORT_TRACEPOINT_SYMBOL_GPL() or EXPORT_TRACEPOINT_SYMBOL() can be |
| 102 | used to export the defined tracepoints. | 101 | used to export the defined tracepoints. |
| 103 | |||
| 104 | * Probe / tracepoint example | ||
| 105 | |||
| 106 | See the example provided in samples/tracepoints | ||
| 107 | |||
| 108 | Compile them with your kernel. They are built during 'make' (not | ||
| 109 | 'make modules') when CONFIG_SAMPLE_TRACEPOINTS=m. | ||
| 110 | |||
| 111 | Run, as root : | ||
| 112 | modprobe tracepoint-sample (insmod order is not important) | ||
| 113 | modprobe tracepoint-probe-sample | ||
| 114 | cat /proc/tracepoint-sample (returns an expected error) | ||
| 115 | rmmod tracepoint-sample tracepoint-probe-sample | ||
| 116 | dmesg | ||
