kthreads scheduling

ashok449 · 07-23-2008, 11:53 PM

Dear All,

I'm tryinng to use kthreads, but kthread using 100% CPU time and later on it goes on to halt state.

How do I schedule kthreads?

Code:

static struct task_struct *test1_task;

test1_task = kthread_run(test1_thread, NULL,  "TEST1_THREAD");

int test1_thread(void *unused1)
{ while(1)
        {
        printk(KERN_ALERT "test1 thread\n");
         }
        return 0;
}

Thanks all in advance ...

storkus · 07-24-2008, 06:31 AM

It's been a while since I've written code (hope to fix that soon) but your statement "while(1)" will loop forever because its testing a constant,
if I'm reading this right. I hope that's just a typo here and not in your actual code. Otherwise, I'd say you were writing something for a corewar!

Mike

ashok449 · 07-24-2008, 07:58 AM

here I'm using while(1) because I wanna use my thread function all the time.

as its taking all of my CPU time, how do I schedule this ?

sundialsvcs · 07-24-2008, 09:02 AM

Look at other kernel threads.

In modern Linuxes, kernel threads can be "interruptible," but they have to request to be so.

Kernel threads, since they are "part of the kernel," do have a pre-eminent and privileged position in the grand scheme of things. You have created a kernel thread that never yields, cannot be interrupted, and never ends. Naturally, the dispatcher dispatches nothing else.