Horton

Re: Pluggable cumulative statistics

Michael Paquier <michael@paquier.xyz>

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From: Michael Paquier <michael@paquier.xyz>
To: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Cc: Postgres hackers <pgsql-hackers@lists.postgresql.org>
Date: 2024-07-12T00:38:30Z
Lists: pgsql-hackers 
On Thu, Jul 11, 2024 at 01:29:08PM +0000, Bertrand Drouvot wrote:
> Please find attached a patch to do so (attached as .txt to not perturb the
> cfbot).

+ * Reads in existing statistics file into the shared stats hash (for non fixed
+ * amount stats) or into the fixed amount stats.

Thanks.  I have applied a simplified version of that, not mentioning
the details of what happens depending on the kinds of stats dealt
with.
--
Michael

Commits

  1. injection_points: Add some fixed-numbered statistics

  2. injection_points: Add some cumulative stats for injection points

  3. Add helper routines to retrieve data for custom fixed-numbered pgstats

  4. Introduce pluggable APIs for Cumulative Statistics

  5. Switch PgStat_Kind from an enum to a uint32 type

  6. Improve comment of pgstat_read_statsfile()

  7. Add a new 'F' entry type for fixed-numbered stats in pgstats file

  8. Add PgStat_KindInfo.init_shmem_cb

  9. Use pgstat_kind_infos to write fixed shared statistics

  10. Replace hardcoded identifiers of pgstats file by #defines