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* Preserve pg_index.indisreplident across REINDEX CONCURRENTLYMichael Paquier2020-06-05
| | | | | | | | | | | If the flag value is lost, logical decoding would work the same way as REPLICA IDENTITY NOTHING, meaning that no old tuple values would be included in the changes anymore produced by logical decoding. Author: Michael Paquier Reviewed-by: Euler Taveira Discussion: https://postgr.es/m/20200603065340.GK89559@paquier.xyz Backpatch-through: 12
* Reject "23:59:60.nnn" in datetime input.Tom Lane2020-06-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | It's intentional that we don't allow values greater than 24 hours, while we do allow "24:00:00" as well as "23:59:60" as inputs. However, the range check was miscoded in such a way that it would accept "23:59:60.nnn" with a nonzero fraction. For time or timetz, the stored result would then be greater than "24:00:00" which would fail dump/reload, not to mention possibly confusing other operations. Fix by explicitly calculating the result and making sure it does not exceed 24 hours. (This calculation is redundant with what will happen later in tm2time or tm2timetz. Maybe someday somebody will find that annoying enough to justify refactoring to avoid the duplication; but that seems too invasive for a back-patched bug fix, and the cost is probably unmeasurable anyway.) Note that this change also rejects such input as the time portion of a timestamp(tz) value. Back-patch to v10. The bug is far older, but to change this pre-v10 we'd need to ensure that the logic behaves sanely with float timestamps, which is possibly nontrivial due to roundoff considerations. Doesn't really seem worth troubling with. Per report from Christoph Berg. Discussion: https://postgr.es/m/20200520125807.GB296739@msg.df7cb.de
* Fix comment in be-secure-openssl.cMichael Paquier2020-06-04
| | | | | | | | Since 573bd08, hardcoded DH parameters have been moved to a different file, making the comment on top of load_dh_buffer() incorrect. Author: Daniel Gustafsson Discussion: https://postgr.es/m/D9492CCB-9A91-4181-A847-1779630BE2A7@yesql.se
* Fix instance of elog() called while holding a spinlockMichael Paquier2020-06-04
| | | | | | | | This broke the project rule to not call any complex code while a spinlock is held. Issue introduced by b89e151. Discussion: https://postgr.es/m/20200602.161518.1399689010416646074.horikyota.ntt@gmail.com Backpatch-through: 9.5
* Don't call palloc() while holding a spinlock, either.Tom Lane2020-06-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix some more violations of the "only straight-line code inside a spinlock" rule. These are hazardous not only because they risk holding the lock for an excessively long time, but because it's possible for palloc to throw elog(ERROR), leaving a stuck spinlock behind. copy_replication_slot() had two separate places that did pallocs while holding a spinlock. We can make the code simpler and safer by copying the whole ReplicationSlot struct into a local variable while holding the spinlock, and then referencing that copy. (While that's arguably more cycles than we really need to spend holding the lock, the struct isn't all that big, and this way seems far more maintainable than copying fields piecemeal. Anyway this is surely much cheaper than a palloc.) That bug goes back to v12. InvalidateObsoleteReplicationSlots() not only did a palloc while holding a spinlock, but for extra sloppiness then leaked the memory --- probably for the lifetime of the checkpointer process, though I didn't try to verify that. Fortunately that silliness is new in HEAD. pg_get_replication_slots() had a cosmetic violation of the rule, in that it only assumed it's safe to call namecpy() while holding a spinlock. Still, that's a hazard waiting to bite somebody, and there were some other cosmetic coding-rule violations in the same function, so clean it up. I back-patched this as far as v10; the code exists before that but it looks different, and this didn't seem important enough to adapt the patch further back. Discussion: https://postgr.es/m/20200602.161518.1399689010416646074.horikyota.ntt@gmail.com
* Don't call elog() while holding spinlock.Fujii Masao2020-06-02
| | | | | | | | | | | | Previously UpdateSpillStats() called elog(DEBUG2) while holding the spinlock even though the local variables that the elog() accesses don't need to be protected by the lock. Since spinlocks are intended for very short-term locks, they should not be used when calling elog(DEBUG2). So this commit moves that elog() out of spinlock period. Author: Kyotaro Horiguchi Reviewed-by: Amit Kapila and Fujii Masao Discussion: https://postgr.es/m/20200602.161518.1399689010416646074.horikyota.ntt@gmail.com
* Use correct and consistent unit abbreviationPeter Eisentraut2020-06-01
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* Fix use-after-release mistake in currtid() and currtid2() for viewsMichael Paquier2020-06-01
| | | | | | | | | | This issue has been present since the introduction of this code as of a3519a2 from 2002, and has been found by buildfarm member prion that uses RELCACHE_FORCE_RELEASE via the tests introduced recently in e786be5. Discussion: https://postgr.es/m/20200601022055.GB4121@paquier.xyz Backpatch-through: 9.5
* Fix crashes with currtid() and currtid2()Michael Paquier2020-06-01
| | | | | | | | | | | | | | | | | | | | | | | A relation that has no storage initializes rd_tableam to NULL, which caused those two functions to crash because of a pointer dereference. Note that in 11 and older versions, this has always failed with a confusing error "could not open file". These two functions are used by the Postgres ODBC driver, which requires them only when connecting to a backend strictly older than 8.1. When connected to 8.2 or a newer version, the driver uses a RETURNING clause instead whose support has been added in 8.2, so it should be possible to just remove both functions in the future. This is left as an issue to address later. While on it, add more regression tests for those functions as we never really had coverage for them, and for aggregates of TIDs. Reported-by: Jaime Casanova, via sqlsmith Author: Michael Paquier Reviewed-by: Álvaro Herrera Discussion: https://postgr.es/m/CAJGNTeO93u-5APMga6WH41eTZ3Uee9f3s8dCpA-GSSqNs1b=Ug@mail.gmail.com Backpatch-through: 12
* Use CP_SMALL_TLIST for hash aggregateTomas Vondra2020-05-31
| | | | | | | | | | | | | | | | | Commit 1f39bce021 added disk-based hash aggregation, which may spill incoming tuples to disk. It however did not request projection to make the tuples as narrow as possible, which may mean having to spill much more data than necessary (increasing I/O, pushing other stuff from page cache, etc.). This adds CP_SMALL_TLIST in places that may use hash aggregation - we do that only for AGG_HASHED. It's unnecessary for AGG_SORTED, because that either uses explicit Sort (which already does projection) or pre-sorted input (which does not need spilling to disk). Author: Tomas Vondra Reviewed-by: Jeff Davis Discussion: https://postgr.es/m/20200519151202.u2p2gpiawoaznsv2%40development
* llvmjit: Fix building against LLVM 11 by removing unnecessary include.Andres Freund2020-05-28
| | | | | | | | | LLVM has removed this header, in the branch that will become llvm 11. But as it turns out we didn't actually need it, so just remove it. Author: Jesse Zhang <sbjesse@gmail.com> Discussion: https://postgr.es/m/CAGf+fX7bvtP0YXMu7pOsu_NwhxW6dArTkxb=jt7M2-UJkyJ_3g@mail.gmail.com Backpatch: 11, where JIT support using llvm was introduced.
* Add CHECK_FOR_INTERRUPTS() to the repeat() functionJoe Conway2020-05-28
| | | | | | | | | | | The repeat() function loops for potentially a long time without ever checking for interrupts. This prevents, for example, a query cancel from interrupting until the work is all done. Fix by inserting a CHECK_FOR_INTERRUPTS() into the loop. Backpatch to all supported versions. Discussion: https://www.postgresql.org/message-id/flat/8692553c-7fe8-17d9-cbc1-7cddb758f4c6%40joeconway.com
* Add missing error code to "cannot attach index ..." error.Heikki Linnakangas2020-05-28
| | | | | | | | ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE was used in an ereport with the same message but different errdetail a few lines earlier, so use that here as well. Backpatch-through: 11
* Fix some mentions to memory units in postgresql.conf.sampleMichael Paquier2020-05-28
| | | | | | | | | The default unit for max_slot_wal_keep_size is megabytes. While on it, also change temp_file_limit to use a more consistent wording. Reported-by: Jeff Janes, Fujii Masao Author: Kyotaro Horiguchi Discussion: https://postgr.es/m/CAMkU=1wWZhhjpwRFKJ9waQGxxROeC0P6UqPvb90fAaGz7dhoHA@mail.gmail.com
* Avoid fragmentation of logical tapes when writing concurrently.Jeff Davis2020-05-26
| | | | | | | | | | Disk-based HashAgg relies on writing to multiple tapes concurrently. Avoid fragmentation of the tapes' blocks by preallocating many blocks for a tape at once. No file operations are performed during preallocation; only the block numbers are reserved. Reviewed-by: Tomas Vondra Discussion: https://postgr.es/m/20200519151202.u2p2gpiawoaznsv2%40development
* Add lcov exclusion markers to jsonpath scannerPeter Eisentraut2020-05-26
| | | | | This was done for all scanners in 421167362242ce1fb46d6d720798787e7cd65aad but not added to the new one.
* gss: add missing references to hostgssenc and hostnogssencBruce Momjian2020-05-25
| | | | | | | | | | | | | These were missed when these were added to pg_hba.conf in PG 12; updates docs and pg_hba.conf.sample. Reported-by: Arthur Nascimento Bug: 16380 Discussion: https://postgr.es/m/20200421182736.GG19613@momjian.us Backpatch-through: 12
* Reconcile nodes/*funcs.c.Noah Misch2020-05-25
| | | | | The stmt_len changes do not affect behavior. LimitPath has no other support functions, so that part changes only debugging output.
* Add missing invocations to object access hooksMichael Paquier2020-05-23
| | | | | | | | | | | | | | | The following commands have been missing calls to object access hooks InvokeObjectPost{Create|Alter}Hook normally applied to all commands: - ALTER RULE RENAME TO - ALTER USER MAPPING - CREATE ACCESS METHOD - CREATE STATISTICS Thanks also to Robert Haas for the discussion. Author: Mark Dilger Reviewed-by: Álvaro Herrera, Michael Paquier Discussion: https://postgr.es/m/435CD295-F409-44E0-91EC-DF32C7AFCD76@enterprisedb.com
* Fix two typos in a commentAlvaro Herrera2020-05-22
| | | | They were introduced in 898e5e3290a7; backpatch to 12.
* Remove unnecessary castPeter Eisentraut2020-05-22
| | | | | Probably copied from nearby calls where it is necessary. But this one also casts away constness, so it was doubly annoying.
* Adjust indentation in src/backend/optimizer/README.Etsuro Fujita2020-05-22
| | | | | | | | | | The previous indentation of optimizer functions was unclear; adjust the indentation dashes so that a deeper level of indentation indicates that the outer optimizer function calls the inner one. Author: Richard Guo, with additional change by me Reviewed-by: Kyotaro Horiguchi Discussion: https://postgr.es/m/CAMbWs4-U-ogzpchGsP2BBMufCss1hktm%2B%2BeTJK_dUC196pw0cQ%40mail.gmail.com
* Clear some style deviations.Noah Misch2020-05-21
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* part_strategy does not need its very own keyword classification.Tom Lane2020-05-19
| | | | | | | This should be plain old ColId. Making it so makes the grammar less complicated, and makes the compiled tables a kilobyte or so smaller (likely because they don't have to deal with a keyword classification that's not used anyplace else).
* Reconsider nbtree page deletion assertion.Peter Geoghegan2020-05-19
| | | | | | | | | | | | | | | | Commit 624686abcf8 added an assertion that verified that _bt_search successfully relocated the leaf page undergoing deletion. Page deletion cannot deal with the case where the descent stack is to the right of the page, so this seemed critical (deletion can only handle the case where the descent stack is to the left of the leaf/target page). However, the assertion went a bit too far. Since only a buffer pin is held on the leaf page throughout the call to _bt_search, nothing guarantees that it can't have split during this small window. And if does actually split, _bt_search may end up "relocating" a page to the right of the original target leaf page. This scenario seems extremely unlikely, but it must still be considered. Remove the assertion, and document how we cope in this scenario.
* WITH TIES: number of rows is optional and defaults to oneAlvaro Herrera2020-05-18
| | | | | | | | FETCH FIRST .. ONLY implements this correctly, but we missed to include it for FETCH FIRST .. WITH TIES in commit 357889eb17bb. Author: Vik Fearing Discussion: https://postgr.es/m/6aa690ef-551d-e24f-2690-c38c2442947c@postgresfriends.org
* Translation updatesPeter Eisentraut2020-05-18
| | | | | Source-Git-URL: https://git.postgresql.org/git/pgtranslation/messages.git Source-Git-Hash: 031ca65d7825c3e539a3e62ea9d6630af12e6b6b
* Fix typos in READMEMagnus Hagander2020-05-18
| | | | Author: Daniel Gustafsson
* Fix comment in slot.c.Amit Kapila2020-05-18
| | | | | | | | Reported-by: Sawada Masahiko Author: Sawada Masahiko Reviewed-by: Amit Kapila Backpatch-through: 9.5 Discussion: https://postgr.es/m/CA+fd4k4Ws7M7YQ8PqSym5WB1y75dZeBTd1sZJUQdfe0KJQ-iSA@mail.gmail.com
* Mop-up for wait event naming issues.Tom Lane2020-05-16
| | | | | | | | | | | | Synchronize the event names for parallel hash join waits with other event names, by getting rid of the slashes and dropping "-ing" suffixes. Rename ClogGroupUpdate to XactGroupUpdate, to match the new SLRU name. Move the ProcSignalBarrier event to the IPC category; it doesn't belong under IO. Also a bit more wordsmithing in the wait event documentation tables. Discussion: https://postgr.es/m/4505.1589640417@sss.pgh.pa.us
* Make pg_stat_wal_receiver consistent with the WAL receiver's shmem infoMichael Paquier2020-05-17
| | | | | | | | | | | | | d140f2f3 has renamed receivedUpto to flushedUpto, and has added writtenUpto to the WAL receiver's shared memory information, but pg_stat_wal_receiver was not consistent with that. This commit renames received_lsn to flushed_lsn, and adds a new column called written_lsn. Bump catalog version. Author: Michael Paquier Reviewed-by: Álvaro Herrera Discussion: https://postgr.es/m/20200515090817.GA212736@paquier.xyz
* Run pgindent with new pg_bsd_indent version 2.1.1.Tom Lane2020-05-16
| | | | | | | | | | | Thomas Munro fixed a longstanding annoyance in pg_bsd_indent, that it would misformat lines containing IsA() macros on the assumption that the IsA() call should be treated like a cast. This improves some other cases involving field/variable names that match typedefs, too. The only places that get worse are a couple of uses of the OpenSSL macro STACK_OF(); we'll gladly take that trade-off. Discussion: https://postgr.es/m/20200114221814.GA19630@alvherre.pgsql
* Final pgindent run with pg_bsd_indent version 2.1.Tom Lane2020-05-16
| | | | | | | This is just to provide a clean basis for comparison of the results of the new version. I did fix a typo that crept into 242dfcbaf. Discussion: https://postgr.es/m/20200114221814.GA19630@alvherre.pgsql
* Fix assertion with relation using REPLICA IDENTITY FULL in subscriberMichael Paquier2020-05-16
| | | | | | | | | | | | | | | | In a logical replication subscriber, a table using REPLICA IDENTITY FULL which has a primary key would try to use the primary key's index available to scan for a tuple, but an assertion only assumed as correct the case of an index associated to REPLICA IDENTITY USING INDEX. This commit corrects the assertion so as the use of a primary key index is a valid case. Reported-by: Dilip Kumar Analyzed-by: Dilip Kumar Author: Euler Taveira Reviewed-by: Michael Paquier, Masahiko Sawada Discussion: https://postgr.es/m/CAFiTN-u64S5bUiPL1q5kwpHNd0hRnf1OE-bzxNiOs5zo84i51w@mail.gmail.com Backpatch-through: 10
* Change locktype "speculative token" to "spectoken".Tom Lane2020-05-15
| | | | | | | | | | | | | | | It's just weird that this name wasn't chosen to look like an identifier. The suspicion that it wasn't thought about too hard is reinforced by the fact that it wasn't documented in the pg_locks view (until I did so, a day or two back). Update, and add a comment reminding future adjusters of this array to fix the docs too. Do some desultory wordsmithing on various entries in the wait events tables. Discussion: https://postgr.es/m/24595.1589326879@sss.pgh.pa.us
* Fix walsender error cleanup codeAlvaro Herrera2020-05-15
| | | | | | | | | | | | | | | In commit 850196b610d2 I (Álvaro) failed to handle the case of walsender shutting down on an error before setting up its 'xlogreader' pointer; the error handling code dereferences the pointer, causing a crash. Fix by testing the pointer before trying to dereference it. Kyotaro authored the code fix; I adopted Nathan's test case to be used by the TAP tests and added the necessary PostgresNode change. Reported-by: Nathan Bossart <bossartn@amazon.com> Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://postgr.es/m/C04FC24E-903D-4423-B312-6910E4D846E5@amazon.com
* Drop the redundant "Lock" suffix from LWLock wait event names.Tom Lane2020-05-15
| | | | | | | | | | | | This was mostly confusing, especially since some wait events in this class had the suffix and some did not. While at it, stop exposing MainLWLockNames[] as a globally visible name; any code using that directly is almost certainly wrong, as its name has been misleading for some time. (GetLWLockIdentifier() is what to use instead.) Discussion: https://postgr.es/m/28683.1589405363@sss.pgh.pa.us
* Fix bogus initialization of replication origin shared memory state.Tom Lane2020-05-15
| | | | | | | | | | | | | | | | | The previous coding zeroed out offsetof(ReplicationStateCtl, states) more bytes than it was entitled to, as a consequence of starting the zeroing from the wrong pointer (or, if you prefer, using the wrong calculation of how much to zero). It's unsurprising that this has not caused any reported problems, since it can be expected that the newly-allocated block is at the end of what we've used in shared memory, and we always make the shmem block substantially bigger than minimally necessary. Nonetheless, this is wrong and it could bite us someday; plus it's a dangerous model for somebody to copy. This dates back to the introduction of this code (commit 5aa235042), so back-patch to all supported branches.
* Rename assorted LWLock tranches.Tom Lane2020-05-15
| | | | | | | | | | | | | | | | Choose names that fit into the conventions for wait event names (particularly, that multi-word names are in the style MultiWordName) and hopefully convey more information to non-hacker users than the previous names did. Also rename SerializablePredicateLockListLock to SerializablePredicateListLock; the old name was long enough to cause table formatting problems, plus the double occurrence of "Lock" seems confusing/error-prone. Also change a couple of particularly opaque LWLock field names. Discussion: https://postgr.es/m/28683.1589405363@sss.pgh.pa.us
* Add comments linking pg_strftime to timestamptz_to_strAlvaro Herrera2020-05-15
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* Avoid killing btree items that are already deadAlvaro Herrera2020-05-15
| | | | | | | | | | | | | | | | | | | | | | _bt_killitems marks btree items dead when a scan leaves the page where they live, but it does so with only share lock (to improve concurrency). This was historicall okay, since killing a dead item has no consequences. However, with the advent of data checksums and wal_log_hints, this action incurs a WAL full-page-image record of the page. Multiple concurrent processes would write the same page several times, leading to WAL bloat. The probability of this happening can be reduced by only killing items if they're not already dead, so change the code to do that. The problem could eliminated completely by having _bt_killitems upgrade to exclusive lock upon seeing a killable item, but that would reduce concurrency so it's considered a cure worse than the disease. Backpatch all the way back to 9.5, since wal_log_hints was introduced in 9.4. Author: Masahiko Sawada <masahiko.sawada@2ndquadrant.com> Discussion: https://postgr.es/m/CA+fd4k6PeRj2CkzapWNrERkja5G0-6D-YQiKfbukJV+qZGFZ_Q@mail.gmail.com
* Rename SLRU structures and associated LWLocks.Tom Lane2020-05-15
| | | | | | | | | | | | | | | | | | | | | | | | | | Originally, the names assigned to SLRUs had no purpose other than being shmem lookup keys, so not a lot of thought went into them. As of v13, though, we're exposing them in the pg_stat_slru view and the pg_stat_reset_slru function, so it seems advisable to take a bit more care. Rename them to names based on the associated on-disk storage directories (which fortunately we *did* think about, to some extent; since those are also visible to DBAs, consistency seems like a good thing). Also rename the associated LWLocks, since those names are likewise user-exposed now as wait event names. For the most part I only touched symbols used in the respective modules' SimpleLruInit() calls, not the names of other related objects. This renaming could have been taken further, and maybe someday we will do so. But for now it seems undesirable to change the names of any globally visible functions or structs, so some inconsistency is unavoidable. (But I *did* terminate "oldserxid" with prejudice, as I found that name both unreadable and not descriptive of the SLRU's contents.) Table 27.12 needs re-alphabetization now, but I'll leave that till after the other LWLock renamings I have in mind. Discussion: https://postgr.es/m/28683.1589405363@sss.pgh.pa.us
* Make COPY TO keep locks until the transaction end.Amit Kapila2020-05-15
| | | | | | | | | | | | | | | | | | COPY TO released the ACCESS SHARE lock immediately when it was done rather than holding on to it until the end of the transaction. This breaks the case where a REPEATABLE READ transaction could see an empty table if it repeats a COPY statement and somebody truncated the table in the meantime. Before 4dded12faad the lock was also released after COPY FROM, but the commit failed to notice the irregularity in COPY TO. This is old behavior but doesn't seem important enough to backpatch. Author: Laurenz Albe, based on suggestion by Robert Haas and Tom Lane Reviewed-by: Amit Kapila Discussion: https://postgr.es/m/7bcfc39d4176faf85ab317d0c26786953646a411.camel@cybertec.at
* Remove duplicated comment block in event_trigger.cMichael Paquier2020-05-15
| | | | | | | | | | | The reasons why event triggers are disabled in standalone mode are documented in the code path of ddl_command_start, and other places checking if standalone mode is enabled or not mention to refer to the comment for ddl_command_start, except for table_rewrite that duplicated the same explanation. Reported-by: David G. Johnston Discussion: https://postgr.es/m/CAKFQuwYqHtXpvr2mBJRwH9f+Y5y1GXw3rhbaAu0Dk2MoNevsmA@mail.gmail.com
* Initial pgindent and pgperltidy run for v13.Tom Lane2020-05-14
| | | | | | | | | | | Includes some manual cleanup of places that pgindent messed up, most of which weren't per project style anyway. Notably, it seems some people didn't absorb the style rules of commit c9d297751, because there were a bunch of new occurrences of function calls with a newline just after the left paren, all with faulty expectations about how the rest of the call would get indented.
* Collect built-in LWLock tranche names statically, not dynamically.Tom Lane2020-05-14
| | | | | | | | | | | | | | | | | | There is little point in using the LWLockRegisterTranche mechanism for built-in tranche names. It wastes cycles, it creates opportunities for bugs (since failing to register a tranche name is a very hard-to-detect problem), and the lack of any centralized list of names encourages sloppy nonconformity in name choices. Moreover, since we have a centralized list of the tranches anyway in enum BuiltinTrancheIds, we're certainly not buying any flexibility in return for these disadvantages. Hence, nuke all the backend-internal LWLockRegisterTranche calls, and instead provide a const array of the builtin tranche names. (I have in mind to change a bunch of these names shortly, but this patch is just about getting them into one place.) Discussion: https://postgr.es/m/9056.1589419765@sss.pgh.pa.us
* Move check for fsync=off so that pendingOps still gets cleared.Heikki Linnakangas2020-05-14
| | | | | | | | | | | | Commit 3eb77eba5a moved the loop and refactored it, and inadvertently changed the effect of fsync=off so that it also skipped removing entries from the pendingOps table. That was not intentional, and leads to an assertion failure if you turn fsync on while the server is running and reload the config. Backpatch-through: 12- Reviewed-By: Thomas Munro Discussion: https://www.postgresql.org/message-id/3cbc7f4b-a5fa-56e9-9591-c886deb07513%40iki.fi
* Fix the MSVC build for versions 2015 and later.Amit Kapila2020-05-14
| | | | | | | | | | | | | | | | | | | Visual Studio 2015 and later versions should still be able to do the same as Visual Studio 2012, but the declaration of locale_name is missing in _locale_t, causing the code compilation to fail, hence this falls back instead on to enumerating all system locales by using EnumSystemLocalesEx to find the required locale name.  If the input argument is in Unix-style then we can get ISO Locale name directly by using GetLocaleInfoEx() with LCType as LOCALE_SNAME. In passing, change the documentation references of the now obsolete links. Note that this problem occurs only with NLS enabled builds. Author: Juan José Santamaría Flecha, Davinder Singh and Amit Kapila Reviewed-by: Ranier Vilela and Amit Kapila Backpatch-through: 9.5 Discussion: https://postgr.es/m/CAHzhFSFoJEWezR96um4-rg5W6m2Rj9Ud2CNZvV4NWc9tXV7aXQ@mail.gmail.com
* Fix async.c to not register any SLRU stats counts in the postmaster.Tom Lane2020-05-13
| | | | | | | | | | | | | | | | | | | | | Previously, AsyncShmemInit forcibly initialized the first page of the async SLRU, to save dealing with that case in asyncQueueAddEntries. But this is a poor tradeoff, since many installations do not ever use NOTIFY; for them, expending those cycles in AsyncShmemInit is a complete waste. Besides, this only saves a couple of instructions in asyncQueueAddEntries, which hardly seems likely to be measurable. The real reason to change this now, though, is that now that we track SLRU access stats, the existing code is causing the postmaster to accumulate some access counts, which then get inherited into child processes by fork(), messing up the statistics. Delaying the initialization into the first child that does a NOTIFY fixes that. Hence, we can revert f3d23d83e, which was an incorrect attempt at fixing that issue. Also, add an Assert to pgstat.c that should catch any future errors of the same sort. Discussion: https://postgr.es/m/8367.1589391884@sss.pgh.pa.us
* Dial back -Wimplicit-fallthrough to level 3Alvaro Herrera2020-05-13
| | | | | | | | | The additional pain from level 4 is excessive for the gain. Also revert all the source annotation changes to their original wordings, to avoid back-patching pain. Discussion: https://postgr.es/m/31166.1589378554@sss.pgh.pa.us
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