Re: Changing shared_buffers without restart

> On Wed, Oct 01, 2025 at 03:50:17PM +0530, Ashutosh Bapat wrote:
> The buffer lookup table itself.
> /* Pass location of hashtable header to hash_create */
> infoP->hctl = (HASHHDR *) location;

How does this affect any users of the lookup table, if they do not even
get to see those?

> > Shared buffer lookup table already lives in it's own segment as
> > implemented in the current patch, so I don't see any problem here.
>
> The table is not a single chunk of memory. It's a few chunks spread
> across the shared memory segment. Freeing a lookup table is like
> freeing those chunks. We have ways to free tail parts of shared memory
> segments, but not chunks in-between.

Right, and the idea was to rebuild it completely to fit into the new
size, not just chunk-by-chunk.