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fd6da10a61
The sample is useful for testing, and I'm using it. But after loading the module, it keeps saying hi every 10 seconds, this may be disturbing. Also Steven said commenting out the "hi" helped in causing races. :) [ Impact: make testing a bit easier ] Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A00F6AD.2070008@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
53 lines
1.0 KiB
C
53 lines
1.0 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 void simple_thread_func(int cnt)
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{
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(HZ);
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trace_foo_bar("hello", cnt);
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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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