How much of this problem can be attributed by the fact that repalloc has
to copy the data from the old array into the new one? If it's large,
perhaps we could solve it by replicating the trick we use for
InvalidationChunk. It'd be a bit messy, but the mess would be pretty
well contained, I think.
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Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
