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Limiting CPU usage for processes in linux 2.6.18.8

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From: Eric Descourtis <desc0068@...>
To: <linux-kernel@...>
Cc: <eric.des.courtis@...>
Subject: Limiting CPU usage for processes in linux 2.6.18.8
Date: Sunday, March 30, 2008 - 9:37 pm

Hello,


I would like to implement a patch to the scheduler that limits the CPU usage of individual

processes to a percentage in Linux 2.6.18.8 (Can't be any other version).

I would just like some feedback on the following questions:


1. How can I ensure that limited processes get their CPU time percentage allocation?

2. Are there mechanisms in place that would simplify this process?


I have been hitting my head against the wall for a long time now, any help would be appreciated. 


Thank you.


Eric des Courtis

CC: eric.des.courtis@gmail.com

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[view original message]
From: Bryan Donlan <bdonlan@...>
To: Eric Descourtis <desc0068@...>
Cc: <linux-kernel@...>, <eric.des.courtis@...>
Subject: Re: Limiting CPU usage for processes in linux 2.6.18.8
Date: Monday, March 31, 2008 - 11:25 am

On Sun, Mar 30, 2008 at 9:37 PM, Eric Descourtis


The scheduler isn't really designed to force programs to idle when

there's nothing else to run - that would be a waste :)


If the reason you're on 2.6.18.8 is for Xen, you might want to try

using a recent kernel with paravirt ops, and use the CFS fair group

(or user) scheduler to set cpu shares. See

Documentation/sched-design-CFS.txt . If you really want to eat up a

certain portion of CPU time doing nothing, you could create a program

to busy-loop to starve the others and set CPU shares appropriately,

though I don't really see the point in that.

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Previous thread: RFC: Writing Solaris Device Drivers in Java by Peter Teoh on Sunday, March 30, 2008 - 10:14 pm. (15 messages)

Next thread: [PATCH] Fix off-by-one errors in some pirq warnings by Björn on Sunday, March 30, 2008 - 10:22 pm. (2 messages)