Re: [PATCH] updated preempt-kernel
Lorenzo Allegrucci (firstname.lastname@example.org)
Sat, 20 Oct 2001 14:59:06 +0200
At 03.27 20/10/01 -0400, Robert Love wrote:
>patches to enable a fully preemptible kernel are available at:
>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
>* if HIGHMEM_DEBUG was not on, HIGHMEM would crash the system horribly
>due to a case where preemption was enabled without a corresponding
>* reapply dropped hunk to pgalloc to prevent reentrancy onto per-CPU
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
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