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Date: Sat, 20 Oct 2001 14:59:06 +0200
To: Robert Love <rml@tech9.net>, linux-kernel@vger.kernel.org
From: Lorenzo Allegrucci <lenstra@tiscalinet.it>
Subject: Re: [PATCH] updated preempt-kernel
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At 03.27 20/10/01 -0400, Robert Love wrote:
>Testers Wanted:
>
>patches to enable a fully preemptible kernel are available at:
>	http://tech9.net/rml/linux
>for kernels 2.4.10, 2.4.12, 2.4.12-ac3, and 2.4.13-pre5.
>
>What is this:
>
>A preemptible kernel.  It lowers your latency.
>
>What is New:
>
>* sync with new kernel releases
>
>* if HIGHMEM_DEBUG was on the preempt counter would be incremented at
>times but never decremented.  this resulted in preemption becoming
>permanently disabled.
>
>* if HIGHMEM_DEBUG was not on, HIGHMEM would crash the system horribly
>due to a case where preemption was enabled without a corresponding
>disable.
>
>* reapply dropped hunk to pgalloc to prevent reentrancy onto per-CPU
>data

This above seems to have fixed some spontaneous reboots and oopses
I experiencied with 2.4.11 and 2.4.12-1 preempt-kernel patches.

>The next few patches are going to work on identifying any remaining
>per-CPU variables that need explicit locking under preemption.
>
>	Robert Love



-- 
Lorenzo
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