MMAP Buffers

Hello,
If I may, I want to share some concept to use mmap in PG. It's far, far away from perfect, but it's keeps WAL before
data.As well I crated table, with index, inserted few values, and I done vacuum full on this table. Db inits welcome
fromorginal sources.
 
Performance of read (if backend is loaded) is really good, query time goes down from 450ms to about 410ms. Update may
beslower - but work is in progress (I will start with write, as I went to point when simple updates may be performed).
Eventhat I didn't covered all aspects off updating, it's simple to do it, just to call PreopareBufferToUpdate before
modifingbuffer, ofc some ideas of increasing this are still in my head.
 
Any comments, suggestions welcome.
I didn't included this, as diff, because of ~150kb size (mainly configure scripts, which are included in SVC). Due to
this,You may download it from http://softperience.eu/downloads/pg_mmap_20110415.diff.bz2 (Legal: Work under PostgreSQL
BSDLincense). Patch is just GIT diff, later I will try to grab some git.
 
Regards and have a nice day,Radek.
P.S. This problem about assert with signals, I wrote... I merged with last master, and rebuilded code. I think, I
forgotto rebuild it after previous merge.