Re: how not to write a search algorithm

[Andrew Morton <akpm@zip.com.au>]

William Lee Irwin III wrote:
> 
> ...
> I had fixing "this box should be able to run a lot of tasks but drops
> dead instead" in mind. What subset of this were you looking for?

Getting the kernel back to the level of performance and stability
which it had before the rmap patch has to be the first step.

1) 50% increase in system load on fork/exec/exit workloads
2) Will oops on pte_chain oom
3) pte_highmem is bust
4) tripled ZONE_NORMAL consumption
5) pte chains go wrong with ntpd
6) Poor swapout bandwidth

The first three or four here are fatal to the retention of the
reverse map, IMO.  Futzing around fixing them is taking time
and is holding up other work.

I may have a handle on 1).  Still working it.
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