| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: pg15b1: FailedAssertion("val > base", File: "...src/include/utils/relptr.h", Line: 67, PID: 30485) |
| Date: | 2022-05-31 21:01:04 |
| Message-ID: | CA+TgmoaWZ-hs1vQ8C88ZE57oXpsWj5oxYZYR9y7c2H+uoikz_A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, May 31, 2022 at 4:32 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> This FPM isn't in a DSM. (It happens to have DSMs *inside it*,
> because I'm using it as a separate DSM allocator: instead of making
> them with dsm_impl.c mechanisms, this one recycles space from the main
> shmem area). I view FPM as a reusable 4kb page-based memory allocator
> that could have many potential uses, not as a thing that must live
> inside another thing with a TOC. The fact that it uses the relptr
> thing makes it possible to use FPM inside DSMs too, but that doesn't
> mean it has to be used inside a DSM.
Could it use something other than its own address as the base address?
One way to do this would be to put it at the *end* of the
"Preallocated DSM" space, rather than the beginning.
--
Robert Haas
EDB: http://www.enterprisedb.com
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