Re: SLRU statistics

Tom Lane <tgl@sss.pgh.pa.us>

From: Tom Lane <tgl@sss.pgh.pa.us>

To: Tomas Vondra <tomas.vondra@2ndquadrant.com>

Cc: Fujii Masao <masao.fujii@oss.nttdata.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Masahiko Sawada <masahiko.sawada@2ndquadrant.com>, "tsunakawa.takay@fujitsu.com" <tsunakawa.takay@fujitsu.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>

Date: 2020-05-13T15:01:47Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Fix async.c to not register any SLRU stats counts in the postmaster.
- 7fd89f4d7a51 13.0 landed
Use proper GetDatum function in pg_stat_get_slru().
- 043e3e040160 13.0 landed
Initialize SLRU stats entries to zero.
- f3d23d83ef9a 13.0 landed
Remove pg_xact from pg_stat_reset_slru docs
- e685ca63ca4f 13.0 landed
Remove pg_xact entry from SLRU stats
- 2e08d314ed07 13.0 landed
Track SLRU page hits in SimpleLruReadPage_ReadOnly
- 2b88fdde30d8 13.0 landed
Fix typo in SLRU stats documentation
- 2c220ca46f3f 13.0 landed
Collect statistics about SLRU caches
- 28cac71bd368 13.0 landed
Simplify and rename some GUC variables, per various recent discussions:
- 48f7e6439568 8.3.0 cited

Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
> On Wed, May 13, 2020 at 10:26:39AM -0400, Tom Lane wrote:
>> Why is that necessary?  A static variable is defined by C to start off
>> as zeroes.

> But is it a static variable? It's not declared as 'static' but maybe we
> can assume it inits to zeroes anyway? I see we do that for
> BgWriterStats.

Sorry, by "static" I meant "statically allocated", not "private to
this module".  I'm sure the C standard has some more precise terminology
for this distinction, but I forget what it is.

			regards, tom lane