On Saturday 21 August 2004 21:46, you wrote:
> This comes at the "expense" of
> 1. reintroducing the memory  prefetch into the hash traversal loop;
> 2. adding new pids to the head of the list instead of the tail. I
>    suspect that if this was a big problem then the hash isn't sized
>    well or could benefit from moving hot entries to the head.

It looks like the current code is already adding PIDs to the head: list_add() 
adds to the head of a list and list_add_tail() adds to the tail.

-Ryan