| From: | Noah Misch <noah(at)leadboat(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Antonin Houska <ah(at)cybertec(dot)at>, pgsql-hackers(at)postgresql(dot)org, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl> |
| Subject: | Re: AIO v2.5 |
| Date: | 2025-03-26 21:21:15 |
| Message-ID: | 20250326212115.ab.nmisch@google.com |
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| Lists: | pgsql-hackers |
On Wed, Mar 26, 2025 at 04:33:49PM -0400, Andres Freund wrote:
> On 2025-03-25 17:19:15 -0700, Noah Misch wrote:
> > On Mon, Mar 24, 2025 at 09:18:06PM -0400, Andres Freund wrote:
> > Second, the aio_internal.h comment changes discussed in
> > postgr.es/m/20250325155808.f7.nmisch@google.com and earlier.
>
> Here's my current version of that:
>
> * Note that the externally visible functions to start IO
> * (e.g. FileStartReadV(), via pgaio_io_start_readv()) move an IO from
> * PGAIO_HS_HANDED_OUT to at least PGAIO_HS_STAGED and at most
> * PGAIO_HS_COMPLETED_LOCAL (at which point the handle will be reused).
>
> Does that work?
Yes.
> I think I'll push that as part of the comment updates patch instead of
> "Implement support for reads in smgr/md/fd", unless you see a reason to do so
> differently. I'd have done it in the patch to s/prep/start/, but then it would
> reference functions that don't exist yet...
Agreed.
> > > Subject: [PATCH v2.12 06/28] aio: Add README.md explaining higher level design
> >
> > Ready for commit
>
> Cool.
>
> Comments in it reference PGAIO_HCB_SHARED_BUFFER_READV, so I'm inclined to
> reorder it until after "bufmgr: Implement AIO read support".
Agreed.
> > For example, this local variable could become add_to_nblocks_done instead.
>
> I named it "newly_read_blocks", hope that works?
Yes.
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