> > I'd _really_ like to have a nice value that says "don't run unless you
> > are twiddling your thumbs". Ie a nice 20 perhaps, that says I don't
> > want
>
> I'd like that, too. But it is currently impossible with linux: it
> opens DoS attack.
>
> make your nice 20 task hold some lock, and then run 'normal' task so
> that nice 20 task will never ever get cpu again. BOom, you are holding
> lock and are not going to release it.
>
> Is there solution to this? Maybe processes running in kernel get
> automagical priority boost?
An soon as a process gives up the CPU (and reschedules)
it's in kernel mode. We can, however, use the arch-specific
TSS structure to see if the task is in kernel mode.
Since we only have to do that when rescheduling SCHED_IDLE
processes, the costs will actually be bearable for the kernel
and Linus can be convinced that it's worth the trouble...
Rik -- If a Microsoft product fails, who do you sue?
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| Scouting Vries cubscout leader. http://www.nl.linux.org/~riel |
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