On Fri, 9 Mar 2001, Jamie Lokier wrote:
> Rik van Riel wrote:
> > > Just raise the priority whenever the task's in kernel mode. Problem
> > > solved.
> >
> > Remember that a task schedules itself out at the timer interrupt,
> > in kernel/sched.c::schedule() ... which is kernel mode ;)
>
> Even nicer. On x86 change this:
>
> reschedule:
> call SYMBOL_NAME(schedule) # test
> jmp ret_from_sys_call
>
> to this:
>
> reschedule:
> orl $PF_HONOUR_LOW_PRIORITY,flags(%ebx)
> call SYMBOL_NAME(schedule) # test
> andl $~PF_HONOUR_LOW_PRIORITY,flags(%ebx)
> jmp ret_from_sys_call
Wonderful !
I think we'll want to use this, since we can use it for:
1. SCHED_IDLE
2. load control, when the VM starts thrashing we can just
suspend a few processes to make sure the system as a
whole won't thrash to death
3. ... ?
regards,
Rik
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