> What I'm wondering is if you had any other intended use for "mark for
> cleanup" than VACUUM. The cheapest implementation would allow only
> one process to be waiting for cleanup on a given buffer, which is OK
> for VACUUM because we'll only allow one VACUUM at a time on a relation
> anyway. But if you had some other uses in mind, maybe the code needs
> to support multiple waiters.
I was going to use it for UNDO but it seems that UNDO w/o OSMGR is not
popular and OSMGR will require different approaches anyway, so -
do whatever you want.
Vadim
