Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> I think we must blame bgwriter then. I had a look at it some time ago
> to how hard would it be to remove the useless wakeups and concluded that
> it wasn't really worth the trouble.
I've got similar complaints in the RH/Fedora bugzilla. It's hard to fix
in a portable way because of the lack of consistent select/poll
semantics across various platforms. See my previous notes about the
lack of consistent EINTR behavior and whether we should really be using
SA_RESTART.
The short answer is "don't hold your breath". It'd be nice to have a
plan for improving things though.
regards, tom lane