4e20e3a60b
The sample code in samples/trace_events/ is extremely out of date and does not show all the new fields that have been added since the sample code was written. As most people are unaware of these new fields, adding sample code and explanations of those fields should help out. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
#include <linux/module.h>
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#include <linux/kthread.h>
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/*
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* Any file that uses trace points, must include the header.
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* But only one file, must include the header by defining
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* CREATE_TRACE_POINTS first. This will make the C code that
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* creates the handles for the trace points.
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*/
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#define CREATE_TRACE_POINTS
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#include "trace-events-sample.h"
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static const char *random_strings[] = {
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"Mother Goose",
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"Snoopy",
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"Gandalf",
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"Frodo",
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"One ring to rule them all"
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};
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static void simple_thread_func(int cnt)
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{
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int array[6];
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int len = cnt % 5;
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int i;
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(HZ);
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for (i = 0; i < len; i++)
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array[i] = i + 1;
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array[i] = 0;
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trace_foo_bar("hello", cnt, array, random_strings[len],
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tsk_cpus_allowed(current));
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}
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static int simple_thread(void *arg)
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{
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int cnt = 0;
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while (!kthread_should_stop())
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simple_thread_func(cnt++);
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return 0;
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}
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static struct task_struct *simple_tsk;
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static int __init trace_event_init(void)
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{
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simple_tsk = kthread_run(simple_thread, NULL, "event-sample");
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if (IS_ERR(simple_tsk))
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return -1;
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return 0;
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}
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static void __exit trace_event_exit(void)
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{
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kthread_stop(simple_tsk);
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}
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module_init(trace_event_init);
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module_exit(trace_event_exit);
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MODULE_AUTHOR("Steven Rostedt");
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MODULE_DESCRIPTION("trace-events-sample");
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MODULE_LICENSE("GPL");
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