Jeff Davis writes:
> Idea:
> Let's say we have a routine PinBufferTag, that's like PinBuffer but it
> takes an additional BufferTag argument. When it locks the buffer header,
> it would also compare the argument to the buffer's tag, and if they
> don't match, return a status indicating that it's
Context:
A patch from a while ago was rejected:
http://www.postgresql.org/message-id/1369886097.23418.0.camel@jdavis
Most of the objection seemed to be that extra page pins might happen in
some circumstances, such as this one mentioned by Heikki:
http://www.postgresql.org/message-id/50fd11c5.10
