Re: How can I migrate a currently running task?

[xialiang]

Quoting Bart Van Assche <bart.vanassche@xxxxxxxxx>:

> On Fri, Jun 27, 2008 at 3:17 PM, 夏亮 <xiaiaxaxi@xxxxxxxxxxx> wrote:
> > I am working on Intel Duo Core with Linux OS 2.6.21, and I'd like to
> > migrate task from one cpu to another cpu.
> > In SMP systems, load_balance() function uses move_tasks() to move processes
> > from source runqueue to local runqueue, but it does not move a currently
> > running task. If I want to migrate a currently running task from source
> > runqueue to local runqueue, how can I do? Any suggestion is preferred.
>
> Are you familiar with the glibc pthread_setaffinity_np() function
> and/or the sched_setaffinity() system call ?
>
> Bart.

Yes. I know sched_setaffinity(), it sets cpu_mask of a task. I want to  
use it in a timer interrupt( scheduler_tick() ), can I?

I use sched_getaffinity() in a timer interrupt, but it doesn't work.As  
following,

scheduler_tick()
{
    every 100ms, balance();
}

static int balance(void)
{
    Get temperature of two cpus.
    int ret;
    cpumask_t mask;

    If(one cpu is much hotter than another one){
        ret = sched_getaffinity(rq->curr->pid, &mask);
    }
}

If I comment sched_getaffinity, it works well.


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