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Date: Tue, 11 Feb 2003 12:01:09 +0100
From: Jens Axboe <axboe@suse.de>
To: Pavel Machek <pavel@suse.cz>
Cc: Andrea Arcangeli <andrea@suse.de>, Con Kolivas <ckolivas@yahoo.com.au>,
       lkml <linux-kernel@vger.kernel.org>
Subject: Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest]
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References: <20030209133013.41763.qmail@web41404.mail.yahoo.com> <20030209144622.GB31401@dualathlon.random> <20030210164730.GC443@elf.ucw.cz>
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On Mon, Feb 10 2003, Pavel Machek wrote:
> Hi!
> 
> > The design I proposed is to have multiple I/O queues, where to apply the
> > elevator, and to choose the queue in function of the task->pid that is
> > sumbitting the bh/bio. You'll have to apply an hash to the pid and you
> > probably want a perturbation timer that will change the hash function
> > every 30 sec or so. Plus I want a special queue for everything
> > asynchronoys. So that the asynchronoys queue will be elevated and
> 
> What about adding speicial queue (queues?) for niced things? That way
> nice -20 job would not interfere with normal processes, not even for
> I/O.

Once you have per-process queues, it's fairly trivial to add stuff like
that.

-- 
Jens Axboe

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