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From: Peter Williams <pwil3058@bigpond.net.au>
To: Al Boldi <a1426z@gawab.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE][RFC] PlugSched-6.4 for 2.6.18-rc2
Date: Wed, 26 Jul 2006 10:51:02 +1000	[thread overview]
Message-ID: <44C6BC76.8010808@bigpond.net.au> (raw)
In-Reply-To: <200607252127.14024.a1426z@gawab.com>

Al Boldi wrote:
> Peter Williams wrote:
>> Al Boldi wrote:
>>> Peter Williams wrote:
>>>> Al Boldi wrote:
[bits deleted]
>>>>> It may be really great, to allow schedulers perPid parent, thus
>>>>> allowing the stacking of different scheduler semantics.  This could
>>>>> aid flexibility a lot.
>>>> I'm don't understand what you mean here.  Could you elaborate?
>>> i.e:  Boot the kernel with spa_no_frills, then start X with spa_ws.
>> It's probably not a good idea to have different schedulers managing the
>> same resource.  The way to do different scheduling per process is to use
>> the scheduling policy mechanism i.e. SCHED_FIFO, SCHED_RR, etc.
>> (possibly extended) within each scheduler.  On the other hand, on an SMP
>> system, having a different scheduler on each run queue (or sub set of
>> queues) might be interesting :-).  
> 
> What's wrong with multiple run-queues on UP?

A really high likelihood of starvation of some tasks.

Peter
-- 
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce

  parent reply	other threads:[~2006-07-26  0:51 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-24 15:57 [ANNOUNCE][RFC] PlugSched-6.4 for 2.6.18-rc2 Al Boldi
2006-07-25  2:44 ` Peter Williams
2006-07-25  4:57 ` Al Boldi
2006-07-25  5:44   ` Peter Williams
2006-07-25 18:27     ` Al Boldi
2006-07-25 19:40       ` Valdis.Kletnieks
2006-07-26  4:45         ` Al Boldi
2006-07-26 11:28           ` Valdis.Kletnieks
2006-07-26  0:51       ` Peter Williams [this message]
2006-07-26  4:45         ` Al Boldi
2006-07-26  5:14           ` Peter Williams
2006-07-26 11:23             ` Al Boldi
2006-07-26 12:34               ` Valdis.Kletnieks
2006-07-26 14:04                 ` Al Boldi
2006-07-27  1:32                   ` Valdis.Kletnieks
  -- strict thread matches above, loose matches on Subject: below --
2006-07-21  3:24 Peter Williams

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