Re: Changing shared_buffers without restart

> On Fri, Apr 18, 2025 at 10:06:23AM GMT, Konstantin Knizhnik wrote:
> The only drawback is that we are loosing content of shared buffers in case
> of resize. It may be sadly, but not looks like there is no better
> alternative.

No, why would we loose the content? If we do mremap, it will leave the
content as it is. If we do munmap/mmap with an anonymous backing file,
it will also keep the content in memory. The same with another proposal
about using ftruncate/fallocate only, both will leave the content
untouch unless told to do otherwise.

> But there are still some dependencies on shared buffers size which are not
> addressed in this PR.
> I am not sure how critical they are and is it possible to do something here,
> but at least I want to enumerate them:

Righ, I'm aware about those (except the AIO one, which was added after
the first version of the patch), and didn't address them yet due to the
same reason you've mentioned -- they're not hard errors, rather
inefficiencies. But thanks for the reminder, I keep those in the back of
my mind, and when the rest of the design will be settled down, I'll try
to address them as well.