postgresql/src/backend/utils
Andres Freund 13619598f1 pgstat: split different types of stats into separate files.
pgstat.c is very long, and it's hard to find an order that makes sense and is
likely to be maintained over time. Splitting the different pieces into
separate files makes that a lot easier.

With a few exceptions, this commit just moves code around. Those exceptions
are:
- adding file headers for new files
- removing 'static' from functions
- adapting pgstat_assert_is_up() to work across TUs
- minor comment adjustments
git diff --color-moved=dimmed-zebra is very helpful separating code movement
from code changes.

The next commit in this series will reorder pgstat.[ch] contents to be a bit
more coherent.

Earlier revisions of this patch had "global" statistics (archiver, bgwriter,
checkpointer, replication slots, SLRU, WAL) in one file, because each seemed
small enough. However later commits will increase their size and their
aggregate size is not insubstantial. It also just seems easier to split each
type of statistic into its own file.

Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20220303021600.hs34ghqcw6zcokdh@alap3.anarazel.de
2022-03-21 12:02:25 -07:00
..
activity pgstat: split different types of stats into separate files. 2022-03-21 12:02:25 -07:00
adt Remove workarounds for avoiding [U]INT64_FORMAT in translatable strings. 2022-03-21 11:11:55 -04:00
cache Refactor code for reading and writing relation map files. 2022-03-17 13:21:07 -04:00
error Introduce log_destination=jsonlog 2022-01-17 10:16:53 +09:00
fmgr Create routine able to set single-call SRFs for Materialize mode 2022-03-07 10:26:29 +09:00
hash Update copyright for 2022 2022-01-07 19:04:57 -05:00
init Add option to use ICU as global locale provider 2022-03-17 11:13:16 +01:00
mb Update copyright for 2022 2022-01-07 19:04:57 -05:00
misc Add support for zstd with compression of full-page writes in WAL 2022-03-11 12:18:53 +09:00
mmgr Create routine able to set single-call SRFs for Materialize mode 2022-03-07 10:26:29 +09:00
resowner Update copyright for 2022 2022-01-07 19:04:57 -05:00
sort Add UNIQUE null treatment option 2022-02-03 11:48:21 +01:00
time Clean up assorted failures under clang's -fsanitize=undefined checks. 2022-03-03 18:13:24 -05:00
.gitignore Rearrange makefile rules for running Gen_fmgrtab.pl. 2018-05-03 17:54:18 -04:00
errcodes.txt Update copyright for 2022 2022-01-07 19:04:57 -05:00
Gen_dummy_probes.pl Update copyright for 2022 2022-01-07 19:04:57 -05:00
Gen_dummy_probes.pl.prolog Update copyright for 2022 2022-01-07 19:04:57 -05:00
Gen_dummy_probes.sed Update copyright for 2022 2022-01-07 19:04:57 -05:00
Gen_fmgrtab.pl Update copyright for 2022 2022-01-07 19:04:57 -05:00
generate-errcodes.pl Update copyright for 2022 2022-01-07 19:04:57 -05:00
Makefile Correct Makefile dependencies for catalog scripts 2022-02-14 09:07:09 +07:00
probes.d Update copyright for 2022 2022-01-07 19:04:57 -05:00
README.Gen_dummy_probes Tweak generation of Gen_dummy_probes.pl 2021-05-11 20:02:02 -04:00

# Generating dummy probes

If Postgres isn't configured with dtrace enabled, we need to generate
dummy probes for the entries in probes.d, that do nothing.

This is accomplished in Unix via the sed script `Gen_dummy_probes.sed`. We
used to use this in MSVC builds using the perl utility `psed`, which mimicked
sed. However, that utility disappeared from Windows perl distributions and so
we converted the sed script to a perl script to be used in MSVC builds.

We still keep the sed script as the authoritative source for generating
these dummy probes because except on Windows perl is not a hard requirement
when building from a tarball.

So, if you need to change the way dummy probes are generated, first change
the sed script, and when it's working generate the perl script. This can
be accomplished by using the perl utility s2p.

s2p is no longer part of the perl core, so it might not be on your system,
but it is available on CPAN and also in many package systems. e.g.
on Fedora it can be installed using `cpan App::s2p` or
`dnf install perl-App-s2p`.

The Makefile contains a recipe for regenerating Gen_dummy_probes.pl, so all
you need to do is once you have s2p installed is `make Gen_dummy_probes.pl`
Note that in a VPATH build this will generate the file in the vpath tree,
not the source tree.