RE: [Patch] Optimize dropping of relation buffers using dlist

From: Amit Kapila <amit.kapila16@gmail.com>
> > > > Don't
> > > > we need to guarantee the cache to be valid while recovery?
> > > >
> > >
> > > One possibility could be that we somehow detect that the value we
> > > are using is cached one and if so then only do this optimization.
> >
> > I basically like this direction.  But I'm not sure the additional
> > parameter for smgrnblocks is acceptable.
> >
> > But on the contrary, it might be a better design that
> > DropRelFileNodeBuffers gives up the optimization when
> > smgrnblocks(,,must_accurate = true) returns InvalidBlockNumber.
> >
> 
> I haven't thought about what is the best way to achieve this. Let us see if
> Tsunakawa-San or Kirk-San has other ideas on this?

I see no need for smgrnblocks() to add an argument as it returns the correct cached or measured value.



Regards
Takayuki Tsunakawa