Messages in this thread | | | Date | Tue, 27 Jul 1999 16:04:12 +0200 (CEST) | From | Rik van Riel <> | Subject | Re: low priority soft RT? |
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On Tue, 27 Jul 1999 yodaiken@chelm.cs.nmt.edu wrote:
> I still don't understand the purpose of SCHED_IDLE. It seems as if the > only purpose is to slow down general execution by a couple of percent
> Someone, maybe it was Linus, pointed out that the current range of > "nice" levels is totally arbitrary and simply increasing the range > would do good.
Unfortunately, we showed him he was wrong and the deadlock could still happen with normal timeslicing processes and RT tasks...
SCHED_IDLE adds nothing new and has just as little chance of hanging the computer as normal system things. Because of this, my patch adds a sysctl variable that the sysadmin has to switch before normal users are allowed the use of SCHED_IDLE.
This allows the more careful sysadmins to use SCHED_IDLE for, for instance, rc5des while not impacting normal system behaviour or stability.
Rik -- Open Source: you deserve to be in control of your data. +-------------------------------------------------------------------+ | Le Reseau netwerksystemen BV: http://www.reseau.nl/ | | Linux Memory Management site: http://www.linux.eu.org/Linux-MM/ | | Nederlandse Linux documentatie: http://www.nl.linux.org/ | +-------------------------------------------------------------------+
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