Updated version of Heikki's buffer ring patch, as per my comments here:

The COPY IN part of the patch is not there, pending resolution of
whether we think it adds enough value to be worth uglifying
heap_insert's API for.  Also, I tentatively reduced the threshold
at which heapscans switch to ring mode to NBuffers/16; that probably
needs more thought.  Lastly, I haven't done anything about making
non-btree indexes honor the access strategy during VACUUM scans.

                        regards, tom lane

Attachment: binlsHkz85l0G.bin
Description: buffer-ring-2.patch.gz

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