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Diffstat (limited to 'src/backend/utils/mmgr/aset.c')
| -rw-r--r-- | src/backend/utils/mmgr/aset.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/backend/utils/mmgr/aset.c b/src/backend/utils/mmgr/aset.c index 0cfb934b003..febeb6eaf8e 100644 --- a/src/backend/utils/mmgr/aset.c +++ b/src/backend/utils/mmgr/aset.c @@ -112,9 +112,9 @@ * * With the current parameters, request sizes up to 8K are treated as chunks, * larger requests go into dedicated blocks. Change ALLOCSET_NUM_FREELISTS - * to adjust the boundary point. (But in contexts with small maxBlockSize, - * we may set the allocChunkLimit to less than 8K, so as to avoid space - * wastage.) + * to adjust the boundary point; and adjust ALLOCSET_SEPARATE_THRESHOLD in + * memutils.h to agree. (Note: in contexts with small maxBlockSize, we may + * set the allocChunkLimit to less than 8K, so as to avoid space wastage.) *-------------------- */ @@ -476,7 +476,12 @@ AllocSetContextCreate(MemoryContext parent, * We have to have allocChunkLimit a power of two, because the requested * and actually-allocated sizes of any chunk must be on the same side of * the limit, else we get confused about whether the chunk is "big". + * + * Also, allocChunkLimit must not exceed ALLOCSET_SEPARATE_THRESHOLD. */ + StaticAssertStmt(ALLOC_CHUNK_LIMIT == ALLOCSET_SEPARATE_THRESHOLD, + "ALLOC_CHUNK_LIMIT != ALLOCSET_SEPARATE_THRESHOLD"); + set->allocChunkLimit = ALLOC_CHUNK_LIMIT; while ((Size) (set->allocChunkLimit + ALLOC_CHUNKHDRSZ) > (Size) ((maxBlockSize - ALLOC_BLOCKHDRSZ) / ALLOC_CHUNK_FRACTION)) |