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	 <4AE9F3D2.8030502@nortel.com>
Date: Fri, 30 Oct 2009 15:50:15 +0530
Message-ID: <292693080910300320q1857cc70s73eb524c34af8233@mail.gmail.com>
Subject: Re: Questions about linux scheduler
From: Daniel Rodrick <daniel.rodrick@gmail.com>
To: Chris Friesen <cfriesen@nortel.com>
Cc: Linux Newbie <linux-newbie@vger.kernel.org>,
       Kernel Newbies <kernelnewbies@nl.linux.org>,
       linux-kernel@vger.kernel.org
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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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