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Date: Sun, 16 Jun 2002 17:19:34 +0200 (CEST)
From: Ingo Molnar <mingo@elte.hu>
Reply-To: Ingo Molnar <mingo@elte.hu>
To: Robert Love <rml@mvista.com>
Cc: "David S. Miller" <davem@redhat.com>, <alan@redhat.com>,
       <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.4-ac: sparc64 support for O(1) scheduler
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On 14 Jun 2002, Robert Love wrote:

> > Ummm what is with all of those switch_mm() hacks?  Is this an attempt
> > to work around the locking problems?  Please don't do that as it is
> > going to kill performance and having ifdef sparc64 sched.c changes is
> > ugly to say the least.
> >
> > Ingo posted the correct fix to the locking problem with the patch
> > he posted the other day, that is what should go into the -ac patches.
> 
> I am explicitly refraining from sending Alan any code that is not
> well-tested in 2.5 and my machines first.  As Ingo's new switch_mm()
> bits are not even in 2.5 yet, [...]

Linus applied them already, they will be in 2.5.22. They fix real bugs and
i've seen no problems on my testboxes. Those bits are a must for SMP x86
and Sparc64 as well, there is absolutely no reason to selectively delay
their backmerge. Besides the last task_rq_lock() optimization which got
undone in 2.5 already, all the recent scheduler bits i posted are needed.

	Ingo

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