Re: Restrict data checksums entries in pg_stat_io

On Mon, Jul 13, 2026 at 6:47 PM Daniel Gustafsson <daniel(at)yesql(dot)se> wrote:
>
> > On 10 Jul 2026, at 05:13, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>
> (Sorry for the delayed review)
>
> > The attached patch teaches pgstat_tracks_io_object() and pgstat_tracks_io_op()
> > about the actual I/O paths used by these processes. After the patch,
> > pg_stat_io includes only:
>
> Patch LGTM, and your reasoning around the IO usage of the launcher/worker is
> correct. Thanks!

Thanks for the review!

While reviewing the patch again, I've started thinking that relation/bulkread
should not be removed for the data checksums processes.

Both the launcher and the worker use table_beginscan_catalog(), which
can select BAS_BULKREAD when scanning large catalogs, i.e., pg_database
for the launcher and pg_class for the worker. As a result, seems their
I/O can be reported under the bulkread context.

So I've updated the patch to keep relation/bulkread for both data checksums
processes. Patch attached.

Regards,

--
Fujii Masao