linux-kernel - Re: Questions about linux scheduler

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Date:	Fri, 30 Oct 2009 15:50:15 +0530
From:	Daniel Rodrick <daniel.rodrick@...il.com>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Linux Newbie <linux-newbie@...r.kernel.org>,
	Kernel Newbies <kernelnewbies@...linux.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Questions about linux scheduler

Hi,

>
>> * A lower priority process will run only if there are no runnable
>> processes in priority above it - this automatically means that all RT
>> processes get to run before non-RT processes.
>
> True for RT, not true for non-RT.  In the current scheduler the non-RT
> tasks are stored in a time-ordered structure rather than the 40
> runqueues that were used before.  A non-RT task will run once it becomes
> the most "urgent" task based on its nice level, how much cpu time it
> uses, and how long it's been since it ran last relative to other tasks
> on the system.

One last question ... the nice value of a process never changes
(unless done explicitly using nice system call), right?

Thanks,

Dan
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