kernel thread 사용하기.

2초에 한번씩 일정한 작업을 커널 에서 하려합니다.
아래와 같은 코드를 테스트 해보니 의도했던 대로 안나오는데
어디가 잘못된거죠...?

gcc -D__KERNEL__ -I/usr/src/linux-2.4/include -DMODULE -Wall -O2 -c kwdtd.c -o kwdtd.o

#include <linux/module.h>

#if defined(CONFIG_MODVERSIONS)
#define MODVERSIONS
#include <linux/modversions.h>
#endif

#include <linux/kernel.h>
#include <linux/sched.h>

int kwdtd(void *unused)
{
        daemonize();

        for (;;)
        {       
                printk(KERN_DEBUG "What's going on, kernel!\n");
                schedule_timeout(2);
        }       
}

int init_module(void)
{
        kernel_thread(kwdtd, NULL, 0);
        printk(KERN_DEBUG "Hello, kernel!\n");
        return 0;
}

void cleanup_module(void)
{
        printk(KERN_DEBUG "Good-bye, kernel!\n");
}

위 모듈을 insmod 한 결과 입니다.

  PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME CPU COMMAND
  122 root      25   0     0    0     0 RW   50.5  0.0   0:08   0 insmod
  103 root      25   0   632  632   452 R    25.9  1.0   0:05   0 klogd
  106 root      15   0   764  764   648 S    22.8  1.2   0:04   0 syslogd
  118 root      16   0  1076 1076   892 R     0.5  1.7   0:00   0 top

root@mach337:~# tail -f /var/log/syslog 
Oct  1 10:57:36 mach337 kernel: What's going on? kernel!
Oct  1 10:57:36 mach337 last message repeated 291 times
Oct  1 10:57:36 mach337 kernel: What's el!
Oct  1 10:57:36 mach337 kernel: What's going on? kernel!
Oct  1 10:57:37 mach337 last message repeated 584 times
Oct  1 10:57:37 mach337 kernel: el!
Oct  1 10:57:37 mach337 kernel: What's going on? kernel!