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Commit909cab8

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Fix calculation of PREDICATELOCK_MANAGER_LWLOCK_OFFSET.
Commitea9df81 failed to includeNUM_BUFFER_PARTITIONS in this offset, resulting in a bad offset.Ultimately this threw off NUM_FIXED_LWLOCKS which is based onearlier offsets, leading to memory allocation problems. It seemslikely to have also caused increased LWLOCK contention whenserializable transactions were used, because lightweight locks usedfor that overlapped others.Reported by Amit Kapila with analysis and fix.Backpatch to 9.4, where the bug was introduced.
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‎src/include/storage/lwlock.h

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -151,7 +151,7 @@ extern PGDLLIMPORT LWLockPadded *MainLWLockArray;
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#defineLOCK_MANAGER_LWLOCK_OFFSET\
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(BUFFER_MAPPING_LWLOCK_OFFSET + NUM_BUFFER_PARTITIONS)
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#definePREDICATELOCK_MANAGER_LWLOCK_OFFSET \
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(NUM_INDIVIDUAL_LWLOCKS + NUM_LOCK_PARTITIONS)
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(LOCK_MANAGER_LWLOCK_OFFSET + NUM_LOCK_PARTITIONS)
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#defineNUM_FIXED_LWLOCKS \
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(PREDICATELOCK_MANAGER_LWLOCK_OFFSET + NUM_PREDICATELOCK_PARTITIONS)
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