Re: Reducing the chunk header sizes on all memory context types

Hi,

On 2022-07-12 20:22:57 +0300, Yura Sokolov wrote:
> I don't get, why "large chunk" needs additional fields for size and
> offset.
> Large allocation sizes are certainly rounded to page size.
> And allocations which doesn't fit 1GB we could easily round to 1MB.
> Then we could simply store `size>>20`.
> It will limit MaxAllocHugeSize to `(1<<(30+20))-1` - 1PB. Doubdfully we
> will deal with such huge allocations in near future.

What would gain by doing something like this? The storage density loss of
storing an exact size is smaller than what you propose here.

Greetings,

Andres Freund