d4d86df2ab
make the Page stucture less than half its original size by getting rid of the Lock and the lru. The Lock was required to coordinate the unchaining of pages that where both cached and on the lru freelist. now pages have a single next pointer that is used for palloc.head freelist xor for page cache hash chains in Image.pghash[]. cached pages are not on the freelist anymore, but will be reclaimed from images by the pager when the freelist runs out of pages. each Image has its own 512 hash chains for cached page lookup. That is 2MB worth of pages and there should be no collisions for most text images. page reclaiming can be done without holding palloc.lock as the Image is the owner of the page hash chains protected by the Image's lock. reclaiming Image structures can be done quickly by only reclaiming pages from inactive images, that is images which are not currently in use by segments. the Ref structure has no Lock anymore. Only a single long that is atomically incremented or decremnted using cmpswap(). there are various other changes as a consequence code. and lots of pikeshedding, sorry. |
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