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On Mon, 19 Oct 1998, Rik van Riel wrote:
> As usual, the SCHED_IDLE patch has some problems:
(i assume you refer to the small SCHED_IDLE patch i posted some 1.5 years
ago, which introduces a new scheduling class and Harald Koenig's small
utility that makes use of it. I've attached both of them for reference)
> - if you run more SCHED_IDLE processes, only the first
> one will get any CPU time assigned
nope they will eat up their timeslice and the next one comes, just like RT
processes do. This makes sense from the cache-usage point of view,
SCHED_IDLE processes obviosly dont have any inteactivity needs, so the
longer the timeslice, the better the overall system performance. Think RC5
cracker.
> - it is a gross hack (well, the nice +20 part looks nice
> to me, but the other parts don't)
(here you obviosly talk about that other patch, the SCHED_IDLE patch is a
new scheduling class)
> - it will have continuous recalculation of all process
> priorities
nope they will have recalculation once all SCHED_IDLE processes reach
counter 0, this is normal behavior for Linux.
> with the nice +20 hack ;).
i'm not convinced about nice +20. It hardwires things that should not be
hardwired. SCHED_IDLE is different from a nice-level, as it's a new
scheduling class. (eg. it can easily be extended to be even less idle than
now, ie. only starting up after the system has been _really_ idle for some
given timeout, this gives preference for sleep-and-wakeup-soon processes
not getting their caches trashed) The point: SCHED_IDLE is _really_
different even if it looks alot like nice 19 on the surface. Scheduling
priorities are a fundamentally non-onedimensional problem.
Also, in RL i'm using nice(10000) and 'nice 10000' frequently, just
because sometimes i dont remember wether it's 0-40 or -20 to +20 :) If it
did a sys_nice(+20) it would give very bad interactive performance
compared to a nice +19 process.
-- mingo
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