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From: Mike Galbraith <efault@gmx.de>
To: Con Kolivas <kernel@kolivas.org>
Cc: Oliver Neukum <oliver@neukum.org>, Andrew Morton <akpm@osdl.org>,
	piggin@cyberone.com.au, linux-kernel@vger.kernel.org,
	mingo@elte.hu, felipe_alfaro@linuxmail.org
Subject: Re: [PATCH] O13int for interactivity
Date: Tue, 05 Aug 2003 11:09:02 +0200	[thread overview]
Message-ID: <5.2.1.1.2.20030805104620.01974e28@pop.gmx.net> (raw)
In-Reply-To: <200308051843.54357.kernel@kolivas.org>

At 06:43 PM 8/5/2003 +1000, Con Kolivas wrote:
>On Tue, 5 Aug 2003 18:27, Mike Galbraith wrote:
> > At 06:20 PM 8/5/2003 +1000, Con Kolivas wrote:
> > >Every experiment I've tried at putting tasks at the start of the queue
> > >instead
> > >of the end has resulted in some form of starvation so should not be
> > > possible for any user task and I've abandoned it.
> >
> > (ditto:)
>
>Superuser access real time tasks may be worth reconsidering though...

If they were guaranteed ultra-light, maybe, but userland is just not 
trustworthy.

Better imho would be something like Davide's SOFT_RR with an additional 
automatic priority adjust per cpu usage or something (cpu usage being a 
[very] little bit of a latency hint, and a great 'hurt me' hint).  Best 
would be an API that allowed userland applications to describe their 
latency requirements explicitly, with the scheduler watching users of this 
API like a hawk, ever ready to sanction abusers.  Anything I think about in 
this area gets uncomfortably close to hard rt though, and all of the wisdom 
I've heard on LKLM over the years wrt separation of problem spaces comes 
flooding back.

         -Mike 


  reply	other threads:[~2003-08-05  9:04 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-04 16:07 [PATCH] O13int for interactivity Con Kolivas
2003-08-04 18:24 ` Felipe Alfaro Solana
2003-08-04 19:15 ` Antonio Vargas
2003-08-04 21:32   ` Con Kolivas
2003-08-04 20:11 ` Mike Galbraith
2003-08-04 22:11   ` Con Kolivas
2003-08-05  7:10     ` Mike Galbraith
2003-08-05  2:11 ` Nick Piggin
2003-08-05  2:20   ` Con Kolivas
2003-08-05  2:21     ` Nick Piggin
2003-08-05  3:06       ` Con Kolivas
2003-08-05  3:17         ` Nick Piggin
2003-08-06 18:48           ` Interactivity improvements Timothy Miller
2003-08-06 19:01             ` Mike Fedyk
2003-08-06 20:09             ` Helge Hafting
2003-08-06 21:15             ` Con Kolivas
2003-08-05  3:18       ` [PATCH] O13int for interactivity Con Kolivas
2003-08-05  3:31         ` Nick Piggin
2003-08-05  5:04           ` Con Kolivas
2003-08-05  5:12             ` Nick Piggin
2003-08-05  5:16               ` Con Kolivas
2003-08-05  5:28                 ` Nick Piggin
2003-08-05 10:22                   ` Con Kolivas
2003-08-05 10:32                     ` Nick Piggin
2003-08-05 10:45                       ` Con Kolivas
2003-08-05 10:48                         ` Nick Piggin
2003-08-05 10:56                           ` Con Kolivas
2003-08-05 11:03                             ` Nick Piggin
2003-08-05 11:12                               ` Con Kolivas
2003-08-05 11:23                                 ` Nick Piggin
2003-08-05 11:34                                   ` Con Kolivas
2003-08-05 10:54                         ` Arjan van de Ven
2003-08-05 11:10                           ` Con Kolivas
2003-08-06 21:33                       ` Timothy Miller
2003-08-06 21:33                         ` Con Kolivas
2003-08-07  0:27                           ` Timothy Miller
2003-08-07  0:27                             ` Con Kolivas
2003-08-07  0:44                               ` Timothy Miller
2003-08-11  6:48                       ` Rob Landley
2003-08-11 15:47                         ` William Lee Irwin III
2003-08-12  2:51                         ` Nick Piggin
2003-08-12  6:16                           ` Mike Galbraith
2003-08-12  7:07                             ` Nick Piggin
2003-08-12  7:18                               ` Nick Piggin
2003-08-12  9:42                                 ` Mike Galbraith
2003-08-12 21:11                                   ` Mike Fedyk
2003-08-13  6:55                                     ` Mike Galbraith
2003-08-12  9:22                               ` Mike Galbraith
2003-08-12  9:37                                 ` Nick Piggin
2003-08-12  9:48                                   ` Mike Galbraith
2003-08-12 10:29                           ` Rob Landley
2003-08-12 11:08                             ` Nick Piggin
2003-08-12 11:35                               ` Rob Landley
2003-08-12 11:58                                 ` Nick Piggin
2003-08-13  2:08                                   ` jw schultz
2003-08-13  3:07                                     ` Gene Heskett
2003-08-13  3:24                                       ` Nick Piggin
2003-08-13  5:24                                         ` Gene Heskett
2003-08-13  5:43                                           ` Andrew McGregor
2003-08-13 12:33                                             ` Gene Heskett
2003-08-14  5:03                                               ` Andrew McGregor
2003-08-14 10:48                                                 ` Gene Heskett
2003-08-12 15:36                           ` Timothy Miller
2003-08-05  6:03             ` Andrew Morton
2003-08-05  7:26               ` Con Kolivas
2003-08-05  8:12                 ` Oliver Neukum
2003-08-05  8:20                   ` Con Kolivas
2003-08-05  8:27                     ` Mike Galbraith
2003-08-05  8:43                       ` Con Kolivas
2003-08-05  9:09                         ` Mike Galbraith [this message]
2003-08-05  9:19                           ` Con Kolivas
2003-08-05 10:04                   ` Nick Piggin
2003-08-11  6:57                 ` Rob Landley
2003-08-11 15:58                   ` William Lee Irwin III
2003-08-05  7:53               ` Mike Galbraith
     [not found] <gQ4n.5oS.7@gated-at.bofh.it>
     [not found] ` <jUl6.5eh.1@gated-at.bofh.it>
     [not found]   ` <jUuT.5kZ.15@gated-at.bofh.it>
     [not found]     ` <jWn1.6K1.11@gated-at.bofh.it>
2003-08-13 13:48       ` Pascal Schmidt
2003-08-13 14:50         ` Gene Heskett
  -- strict thread matches above, loose matches on Subject: below --
2003-08-06 10:35 Voluspa
2003-08-04 19:12 Voluspa
2003-07-27 15:12 [PATCH] O10int " Con Kolivas
2003-07-28 18:08 ` Valdis.Kletnieks
2003-07-28 18:40   ` Andrew Morton
2003-08-04 18:51     ` [PATCH] O13int " Felipe Alfaro Solana
2003-08-04 18:58       ` Felipe Alfaro Solana
2003-08-04 21:46         ` Con Kolivas
2003-08-04 22:16           ` Felipe Alfaro Solana

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