Re: spinlock contention

Florian Pflug <fgp@phlo.org> writes:
> Patch attached.

> Beware that it needs at least GCC 4.1, otherwise it'll use a per-partition
> spin lock instead of "locked xadd" to increment the shared counters.

That's already sufficient reason to reject the patch.  Not everyone
uses gcc, let alone very recent versions of gcc.
        regards, tom lane