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Tom Lane 81ca868630 Improve management of SLRU statistics collection. 
Instead of re-identifying which statistics bucket to use for a given
SLRU on every counter increment, do it once during shmem initialization.
This saves a fair number of cycles, and there's no real cost because
we could not have a bucket assignment that varies over time or across
backends anyway.

Also, get rid of the ill-considered decision to let pgstat.c pry
directly into SLRU's shared state; it's cleaner just to have slru.c
pass the stats bucket number.

In consequence of these changes, there's no longer any need to store
an SLRU's LWLock tranche info in shared memory, so get rid of that,
making this a net reduction in shmem consumption.  (That partly
reverts fe702a7b3.)

This is basically code review for 28cac71bd, so I also cleaned up
some comments, removed a dangling extern declaration, fixed some
things that should be static and/or const, etc.

Discussion: https://postgr.es/m/3618.1589313035@sss.pgh.pa.us
2020-05-13 13:08:23 -04:00
..
access Improve management of SLRU statistics collection. 2020-05-13 13:08:23 -04:00
bootstrap Update copyrights for 2020 2020-01-01 12:21:45 -05:00
catalog Do pre-release housekeeping on catalog data. 2020-05-12 13:03:43 -04:00
commands Comments and doc fixes for commit 40d964ec99. 2020-04-14 08:10:27 +05:30
common Update Unicode data to Unicode 13.0.0 and CLDR 37 2020-04-24 09:52:59 +02:00
datatype Update copyrights for 2020 2020-01-01 12:21:45 -05:00
executor Change the display of WAL usage statistics in Explain. 2020-05-05 08:00:53 +05:30
fe_utils Reduce size of backend scanner's tables. 2020-01-13 15:04:31 -05:00
foreign Update copyrights for 2020 2020-01-01 12:21:45 -05:00
jit jit: Reference expression step functions via llvmjit_types. 2020-02-06 22:29:14 -08:00
lib Fix collection of typos and grammar mistakes in the tree 2020-04-10 11:18:39 +09:00
libpq Only provide openssl_tls_init_hook if building with openssl 2020-04-17 15:57:19 -04:00
mb Allow Unicode escapes in any server encoding, not only UTF-8. 2020-03-06 14:17:43 -05:00
nodes Add ALTER .. NO DEPENDS ON 2020-04-20 13:42:12 -04:00
optimizer Support FETCH FIRST WITH TIES 2020-04-07 16:22:13 -04:00
parser Revert 0f5ca02f53 2020-04-08 11:37:27 +03:00
partitioning Allow partitionwise joins in more cases. 2020-04-08 10:25:00 +09:00
port Modify various power 2 calculations to use new helper functions 2020-04-08 16:55:03 +12:00
portability Update copyrights for 2020 2020-01-01 12:21:45 -05:00
postmaster Trigger autovacuum based on number of INSERTs 2020-03-28 19:20:12 +13:00
regex Assume that we have <wchar.h>. 2020-02-21 14:30:47 -05:00
replication Rework XLogReader callback system 2020-05-08 15:40:11 -04:00
rewrite Update copyrights for 2020 2020-01-01 12:21:45 -05:00
snowball Update copyrights for 2020 2020-01-01 12:21:45 -05:00
statistics Use multi-variate MCV lists to estimate ScalarArrayOpExpr 2020-03-14 16:13:00 +01:00
storage Remove smgrdounlink() in smgr.c from the code tree 2020-05-10 10:58:54 +09:00
tcop Allow the planner-related functions and hook to accept the query string. 2020-03-30 13:51:05 +09:00
tsearch Assume that we have <wchar.h>. 2020-02-21 14:30:47 -05:00
utils Clean up cpluspluscheck violation. 2020-04-21 11:21:15 -04:00
.gitignore Refactor dlopen() support 2018-09-06 11:33:04 +02:00
c.h Enable Unix-domain sockets support on Windows 2020-03-28 15:01:01 +01:00
fmgr.h Fix minor violations of FunctionCallInvoke usage protocol. 2020-04-21 14:23:53 -04:00
funcapi.h Avoid holding a directory FD open across assorted SRF calls. 2020-03-16 21:05:52 -04:00
getaddrinfo.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
getopt_long.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
Makefile Get rid of jsonpath_gram.h and jsonpath_scanner.h 2019-03-20 11:13:34 +03:00
miscadmin.h Unify several ways to tracking backend type 2020-03-13 14:01:10 +01:00
pg_config.h.in Enable Unix-domain sockets support on Windows 2020-03-28 15:01:01 +01:00
pg_config_ext.h.in Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
pg_config_manual.h Remove ACLDEBUG #define and associated code. 2020-04-23 15:38:04 -04:00
pg_getopt.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pg_trace.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pgstat.h Improve management of SLRU statistics collection. 2020-05-13 13:08:23 -04:00
pgtar.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pgtime.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
port.h Add -c/--restore-target-wal to pg_rewind 2020-04-01 10:57:03 +09:00
postgres.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
postgres_ext.h Phase 2 of pgindent updates. 2017-06-21 15:19:25 -04:00
postgres_fe.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
rusagestub.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00
windowapi.h Update copyrights for 2020 2020-01-01 12:21:45 -05:00