[ANNOUNCE][RFC] plugsched-2.0 patches ...

From: Peter Williams
Date: Wed Jan 19 2005 - 20:24:36 EST


... are now available from:

<http://prdownloads.sourceforge.net/cpuse/plugsched-2.0-for-2.6.10.patch?download>

as a single patch to linux-2.6.10 and at:

<http://prdownloads.sourceforge.net/cpuse/plugsched-2.0-for-2.6.10.patchset.tar.gz?download>

as a (gzipped and tarred) patch set including "series" file which nominates the order of application of the patches.

This is an update of the earlier version of plugsched (previously released by Con Kolivas) and has a considerably modified scheduler interface that is intended to reduce the amount of code duplication required when adding a new scheduler. It also contains a sysfs interface based on work submitted by Chris Han.

This version of plugsched contains 4 schedulers:

1. "ingosched" which is the standard active/expired array O(1) scheduler created by Ingo Molnar,
2. "staircase" which is Con Kolivas's version 10.5 O(1) staircase scheduler,
3. "spa_no_frills" which is a single priority array O(1) scheduler without any interactive response enhancements, etc., and
4. "zaphod" which is a single priority array O(1) scheduler with interactive response bonuses, throughput bonuses and a choice of priority based or entitlement based interpretation of "nice".

Schedulers 3 and 4 also offer unprivileged real time tasks and hard/soft per task CPU rate caps.

The required scheduler can be selected at boot time by supplying a string of the form "cpusched=<name>" where <name> is one of the names listed above.

The default scheduler (that will be used in the absence of a "cpusched" boot argument) can be configured at build time and is set to "ingosched" by default.

The file /proc/scheduler contains a string describing the current scheduler.

The directory /sys/cpusched/<current scheduler name>/ contains any scheduler configuration control files that may apply to the current scheduler.

Peter
--
Peter Williams pwil3058@xxxxxxxxxxxxxx

"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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