Messages in this thread | | | Date | Sat, 10 Mar 2001 01:56:41 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: static scheduling - SCHED_IDLE? |
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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 -- Linux MM bugzilla: http://linux-mm.org/bugzilla.shtml
Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose...
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