| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Noah Misch <noah(at)leadboat(dot)com> |
| Cc: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Peter Smith <smithpb2250(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Melanie Plageman <melanieplageman(at)gmail(dot)com> |
| Subject: | Re: Relation bulk write facility |
| Date: | 2024-02-24 20:12:43 |
| Message-ID: | CA+hUKGJ8oBeNA_FJj9FwdVsnHCoSyWtoqkwepws+zsoKVEitTA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Feb 25, 2024 at 8:50 AM Noah Misch <noah(at)leadboat(dot)com> wrote:
> On GNU/Linux x64, gcc correctly records alignment=2**12 for the associated
> section (.rodata for bulk_write.o zero_buffer, .bss for pg_prewarm.o
> blockbuffer). If I'm reading this right, neither AIX gcc nor xlc is marking
> the section with sufficient alignment, in bulk_write.o or pg_prewarm.o:
Ah, that is a bit of a hazard that we should probably document.
I guess the ideas to fix this would be: use smgrzeroextend() instead
of this coding, and/or perhaps look at the coding of pg_pwrite_zeros()
(function-local static) for any other place that needs such a thing,
if it would be satisfied by function-local scope?
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