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