Re: Latches vs lwlock contention

On Fri, Oct 28, 2022 at 4:56 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> See attached sketch patches. I guess the main thing that may not be
> good enough is the use of a fixed sized latch buffer. Memory
> allocation in don't-throw-here environments like the guts of lock code
> might be an issue, which is why it just gives up and flushes when
> full; maybe it should try to allocate and fall back to flushing only
> if that fails.

Here's an attempt at that. There aren't actually any cases of uses of
this stuff in critical sections here, so perhaps I shouldn't bother
with that part. The part I'd most like some feedback on is the
heavyweight lock bits. I'll add this to the commitfest.