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Robert Haas d18e75664a Remove CheckpointLock. ... Up until now, we've held this lock when performing a checkpoint or restartpoint, but commit 076a055acf back in 2004 and commit 7e48b77b1c from 2009, taken together, have removed all need for this. In the present code, there's only ever one process entitled to attempt a checkpoint: either the checkpointer, during normal operation, or the postmaster, during single-user operation. So, we don't need the lock. One possible concern in making this change is that it means that a substantial amount of code where HOLD_INTERRUPTS() was previously in effect due to the preceding LWLockAcquire() will now be running without that. This could mean that ProcessInterrupts() gets called in places from which it didn't before. However, this seems unlikely to do very much, because the checkpointer doesn't have any signal mapped to die(), so it's not clear how, for example, ProcDiePending = true could happen in the first place. Similarly with ClientConnectionLost and recovery conflicts. Also, if there are any such problems, we might want to fix them rather than reverting this, since running lots of code with interrupt handling suspended is generally bad. Patch by me, per an inquiry by Amul Sul. Review by Tom Lane and Michael Paquier. Discussion: http://postgr.es/m/CAAJ_b97XnBBfYeSREDJorFsyoD1sHgqnNuCi=02mNQBUMnA=FA@mail.gmail.com		5 years ago
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brin	Pass down "logically unchanged index" hint.	5 years ago
common	Pass down "logically unchanged index" hint.	5 years ago
gin	Pass down "logically unchanged index" hint.	5 years ago
gist	Fix bug in detecting concurrent page splits in GiST insert	5 years ago
hash	Pass down "logically unchanged index" hint.	5 years ago
heap	Remove CheckpointLock.	5 years ago
index	Enhance nbtree index tuple deletion.	5 years ago
nbtree	Enhance nbtree index tuple deletion.	5 years ago
rmgrdesc	Enhance nbtree index tuple deletion.	5 years ago
spgist	Pass down "logically unchanged index" hint.	5 years ago
table	Enhance nbtree index tuple deletion.	5 years ago
tablesample	Update copyright for 2021	5 years ago
transam	Remove CheckpointLock.	5 years ago
Makefile	…