Re: [PATCH 2.5.43-mm2] New shared page table patch

[Martin J. Bligh]

>> For reference, one of the tests was TPC-H.  My code reduced the number of
>> allocated pte_chains from 5 million to 50 thousand.
> 
> Don't tease, what did that do for performance? I see that someone has
> already posted a possible problem, and the code would pass for complex for
> most people, so is the gain worth the pain?

In many cases, this will stop the box from falling over flat on it's 
face due to ZONE_NORMAL exhaustion (from pte-chains), or even total
RAM exhaustion (from PTEs). Thus the performance gain is infinite ;-)

M.