Date: Thu, 9 Sep 2004 22:51:41 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel <linux-kernel@vger.kernel.org>,
       felipe_alfaro@linuxmail.org, Florian Schmidt <mista.tapas@gmx.net>,
       "K.R. Foley" <kr@cybsft.com>, Mark_H_Johnson@Raytheon.com,
       scott@timesys.com
Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk12-R6
Message-ID: <20040909205141.GA8968@elte.hu>
References: <20040903120957.00665413@mango.fruits.de> <20040904195141.GA6208@elte.hu> <20040905140249.GA23502@elte.hu> <20040906110626.GA32320@elte.hu> <1094626562.1362.99.camel@krustophenia.net> <20040909192924.GA1672@elte.hu> <1094758399.1362.268.camel@krustophenia.net> <1094762629.1362.320.camel@krustophenia.net>
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* Lee Revell <rlrevell@joe-job.com> wrote:

> > I believe Scott Wood suggested a fix back when I first reported this,
> > have to check my mailbox.  Scott?
> 
> Nope, checking the original thread, Scott pointed out that any RT
> process will have mlockall'ed anyway and thus won't be affected by
> this latency.  So, this one would be cool to fix, but it's not a
> problem as such.

RT threads will be affected by this latency just as much because it's a
non-preemptable critical section. You are right in that an RT task wont
see the overhead itself because it doesnt generate swap entries.

	Ingo
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