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Diffstat (limited to 'src/backend/storage/lmgr/lock.c')
| -rw-r--r-- | src/backend/storage/lmgr/lock.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c index 002303664aa..86b06b9223f 100644 --- a/src/backend/storage/lmgr/lock.c +++ b/src/backend/storage/lmgr/lock.c @@ -210,9 +210,12 @@ int FastPathLockGroupsPerBackend = 0; * * The selected constant (49157) is a prime not too close to 2^k, and it's * small enough to not cause overflows (in 64-bit). + * + * We can assume that FastPathLockGroupsPerBackend is a power-of-two per + * InitializeFastPathLocks(). */ #define FAST_PATH_REL_GROUP(rel) \ - (((uint64) (rel) * 49157) % FastPathLockGroupsPerBackend) + (((uint64) (rel) * 49157) & (FastPathLockGroupsPerBackend - 1)) /* * Given the group/slot indexes, calculate the slot index in the whole array |