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Use bump context for TID bitmaps stored by vacuum

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Vacuum does not pfree individual entries, and only frees the entire
storage space when finished with it. This allows using a bump context,
eliminating the chunk header in each leaf allocation. Most leaf
allocations will be 16 to 32 bytes, so that's a significant savings.
TidStoreCreateLocal gets a boolean parameter to indicate that the
created store is insert-only.

This requires a separate tree context for iteration, since we free
the iteration state after iteration completes.

Discussion: https://postgr.es/m/CANWCAZac%3DpBePg3rhX8nXkUuaLoiAJJLtmnCfZsPEAS4EtJ%3Dkg%40mail.gmail.com
Discussion: https://postgr.es/m/CANWCAZZQFfxvzO8yZHFWtQV+Z2gAMv1ku16Vu7KWmb5kZQyd1w@mail.gmail.com
This commit is contained in:
John Naylor
2024-04-07 12:27:34 +07:00
parent bb766cde63
commit 8a1b31e6e5
5 changed files with 28 additions and 7 deletions
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2
src/include/access/tidstore.h
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@@ -29,7 +29,7 @@ typedef struct TidStoreIterResult
OffsetNumber *offsets;
} TidStoreIterResult;
extern TidStore *TidStoreCreateLocal(size_t max_bytes);
extern TidStore *TidStoreCreateLocal(size_t max_bytes, bool insert_only);
extern TidStore *TidStoreCreateShared(size_t max_bytes, int tranche_id);
extern TidStore *TidStoreAttach(dsa_handle area_handle, dsa_pointer handle);
extern void TidStoreDetach(TidStore *ts);