"Curtis Faith" <curtis(at)galtair(dot)com> writes:
> Successive writes would write different NON-OVERLAPPING sections of the
> same log buffer. It wouldn't make sense to send three separate copies of
> the entire block. That could indeed cause problems.
So you're going to undo the code's present property that all writes are
block-sized? Aren't you worried about incurring page-in reads because
the kernel can't know that we don't care about data beyond what we've
written so far in the block?
regards, tom lane