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Specialize MemoryContextMemAllocated().

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An AllocSet doubles the size of allocated blocks (up to maxBlockSize),
which means that the current block can represent half of the total
allocated space for the memory context. But the free space in the
current block may never have been touched, so don't count the
untouched memory as allocated for the purposes of
MemoryContextMemAllocated().

Discussion: https://postgr.es/m/ec63d70b668818255486a83ffadc3aec492c1f57.camel@j-davis.com
This commit is contained in:
Jeff Davis
2020-03-18 15:39:14 -07:00
parent 487e9861d0
commit e00912e11a
5 changed files with 77 additions and 28 deletions
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2
src/include/nodes/memnodes.h
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@@ -63,6 +63,7 @@ typedef struct MemoryContextMethods
void (*reset) (MemoryContext context);
void (*delete_context) (MemoryContext context);
Size (*get_chunk_space) (MemoryContext context, void *pointer);
Size (*mem_allocated) (MemoryContext context);
bool (*is_empty) (MemoryContext context);
void (*stats) (MemoryContext context,
MemoryStatsPrintFunc printfunc, void *passthru,
@@ -79,7 +80,6 @@ typedef struct MemoryContextData
/* these two fields are placed here to minimize alignment wastage: */
bool isReset; /* T = no space alloced since last reset */
bool allowInCritSection; /* allow palloc in critical section */
Size mem_allocated; /* track memory allocated for this context */
const MemoryContextMethods *methods; /* virtual function table */
MemoryContext parent; /* NULL if no parent (toplevel context) */
MemoryContext firstchild; /* head of linked list of children */