From: Wessel Dankers <wsl@fruit.eu.org>
To: linux-kernel@vger.kernel.org
Subject: Re: Scheduler priorities
Date: Thu, 28 Mar 2002 08:08:55 +0100 [thread overview]
Message-ID: <20020328070855.GB514@fruit.eu.org> (raw)
In-Reply-To: <20020327125828.U2343-100000@angelina.sl.pt> <1017236512.16546.116.camel@phantasy> <20020327202335.GA514@fruit.eu.org> <1017263732.17510.204.camel@phantasy>
On 2002-03-27 16:14:55-0500, Robert Love wrote:
> On Wed, 2002-03-27 at 15:23, Wessel Dankers wrote:
>
> > Any plans for a SCHED_IDLE?
>
> I think Ingo Molnar has mentioned lately doing one.
>
> The problem is, it is not easy to implement right - there are priority
> inversion issues to deal with ...
Well evidently it should be root-only, just like SCHED_RR and SCHED_FIFO.
If the priority inversion issues are worked out this restriction could be
removed. I remember discussing this problem with Rik van Riel.
The kernel-preempt patch seems to be able to detect when a process holds a
lock; perhaps the process scheduler can temporarily revert to SCHED_NORMAL
when this is the case? Preferably with a large nice value.
--
Wessel Dankers <wsl@fruit.eu.org>
(the armchair engineer)
next prev parent reply other threads:[~2002-03-28 7:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-26 11:41 Nuno Miguel Rodrigues
2002-03-26 17:55 ` Mike Fedyk
2002-03-27 9:41 ` Frank Schaefer
2002-03-27 13:06 ` Nuno Miguel Rodrigues
2002-03-27 13:41 ` Robert Love
2002-03-27 20:23 ` Wessel Dankers
2002-03-27 21:14 ` Robert Love
2002-03-28 7:08 ` Wessel Dankers [this message]
2002-03-28 7:29 ` Robert Love
2002-03-29 21:42 ` Pavel Machek
2002-03-29 23:52 ` Robert Love
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