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author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2008-07-18 16:16:16 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 08:29:05 (GMT) |
commit | 4a0897526bbc5c6ac0df80b16b8c60339e717ae2 (patch) | |
tree | aa8eb17c791cdff175f8cd6cb76f02d05f00029a /samples/tracepoints/tracepoint-probe-sample.c | |
parent | 24b8d831d56aac7907752d22d2aba5d8127db6f6 (diff) | |
download | linux-4a0897526bbc5c6ac0df80b16b8c60339e717ae2.tar.xz |
tracing: tracepoints, samples
Tracepoint example code under samples/.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: 'Peter Zijlstra' <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'samples/tracepoints/tracepoint-probe-sample.c')
-rw-r--r-- | samples/tracepoints/tracepoint-probe-sample.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/samples/tracepoints/tracepoint-probe-sample.c b/samples/tracepoints/tracepoint-probe-sample.c new file mode 100644 index 0000000..55abfdd --- /dev/null +++ b/samples/tracepoints/tracepoint-probe-sample.c @@ -0,0 +1,55 @@ +/* + * tracepoint-probe-sample.c + * + * sample tracepoint probes. + */ + +#include <linux/module.h> +#include <linux/file.h> +#include <linux/dcache.h> +#include "tp-samples-trace.h" + +/* + * Here the caller only guarantees locking for struct file and struct inode. + * Locking must therefore be done in the probe to use the dentry. + */ +static void probe_subsys_event(struct inode *inode, struct file *file) +{ + path_get(&file->f_path); + dget(file->f_path.dentry); + printk(KERN_INFO "Event is encountered with filename %s\n", + file->f_path.dentry->d_name.name); + dput(file->f_path.dentry); + path_put(&file->f_path); +} + +static void probe_subsys_eventb(void) +{ + printk(KERN_INFO "Event B is encountered\n"); +} + +int __init tp_sample_trace_init(void) +{ + int ret; + + ret = register_trace_subsys_event(probe_subsys_event); + WARN_ON(ret); + ret = register_trace_subsys_eventb(probe_subsys_eventb); + WARN_ON(ret); + + return 0; +} + +module_init(tp_sample_trace_init); + +void __exit tp_sample_trace_exit(void) +{ + unregister_trace_subsys_eventb(probe_subsys_eventb); + unregister_trace_subsys_event(probe_subsys_event); +} + +module_exit(tp_sample_trace_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Mathieu Desnoyers"); +MODULE_DESCRIPTION("Tracepoint Probes Samples"); |