From: Jim Houston <jim.houston@attbi.com>
To: efault@gmx.de, linux-kernel@vger.kernel.org
Cc: riel@conectiva.com.br
Subject: Re: 2.5.47 scheduler problems?
Date: Fri, 22 Nov 2002 00:41:19 -0500 [thread overview]
Message-ID: <3DDDC37F.5AC219D5@attbi.com> (raw)
Hi Mike, Rik, Everyone,
The O(1) schedule just isn't fair. It will run a subset
of the runable processes excluding the rest. See my earlier
emails for the details.
I had been working on a fix for this but got distracted
by Posix timers. I still hope to get back to it.
My patch is here:
http://marc.theaimsgroup.com/?l=linux-kernel&m=103508412423719&w=2
It fixes fairness but breaks nice(2). Rik van Riel has a
patch here which builds on my patch which fixes this:
http://marc.theaimsgroup.com/?l=linux-kernel&m=103651801424031&w=2
I just gave this a spin with. The patches still apply cleanly
to linux-2.5.48 and it seems well behaved:-)
I found this problem with the LTP waitpid06 test. It actually
produced a live-lock. See this mail:
http://marc.theaimsgroup.com/?l=linux-kernel&m=103133744217082&w=2
Jim Houston - Concurrent Computer Corp.
next reply other threads:[~2002-11-22 5:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-22 5:41 Jim Houston [this message]
2002-11-22 11:07 ` 2.5.47 scheduler problems? Mike Galbraith
2002-11-22 12:51 ` Mike Galbraith
2002-11-22 14:04 ` Mike Galbraith
-- strict thread matches above, loose matches on Subject: below --
2002-11-18 6:20 Mike Galbraith
2002-11-18 6:51 ` Tim Connors
2002-11-18 7:08 ` Andrew Morton
2002-11-18 7:35 ` Mike Galbraith
2002-11-18 7:29 ` Mike Galbraith
2002-11-18 7:53 ` Tim Connors
2002-11-18 10:52 ` Mike Galbraith
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