Re: wake_up vs. wake_up_sync

Mike Kravetz (mkravetz@sequent.com)
Wed, 27 Jun 2001 15:40:36 -0700

On Wed, Jun 27, 2001 at 02:57:43PM -0700, Scott Long wrote:
> Does reschedule_idle() ever cause the current CPU to get scheduled? That
> is, if someone calls wake_up() and wakes up a higher-priority process
> could reschedule_idle() potentially immediately switch the current CPU
> to that higher-priority process?

No. reschedule_idle() never directly performs a 'task to task' context
switch itself. Instead, it simply marks a currently running task to
indicate that a reschedule is needed on that task's CPU. No task context
switch will occur until schedule() is run on that CPU.

-- 
Mike Kravetz                                 mkravetz@sequent.com
IBM Linux Technology Center
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/