Enlarge bit-space for MemoryContextMethodID
Reserve 4 bits for MemoryContextMethodID rather than 3. 3 bits did
technically allow a maximum of 8 memory context types, however, we've
opted to reserve some bit patterns which left us with only 4 slots, all
of which were used.
Here we add another bit which frees up 8 slots for future memory context
types.
In passing, adjust the enum names in MemoryContextMethodID to make it
more clear which ones can be used and which ones are reserved.
Author: Matthias van de Meent, David Rowley
Discussion: https://postgr.es/m/CAApHDvqGSpCU95TmM=Bp=6xjL_nLys4zdZOpfNyWBk97Xrdj2w@mail.gmail.com
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/0ba8b75e7ea6b7b3090c81239ebcb866772a624b
Modified Files
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src/backend/utils/mmgr/README | 21 ++++++++++------
src/backend/utils/mmgr/mcxt.c | 43 ++++++++++++++++----------------
src/include/utils/memutils_internal.h | 18 +++++++++----
src/include/utils/memutils_memorychunk.h | 32 ++++++++++++++++++------
4 files changed, 72 insertions(+), 42 deletions(-)