Re: Analysis of ganged WAL writes

"Curtis Faith" <curtis@galtair.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