src/backend/utils/mmgr/mcxt.c
Size
GetMemoryChunkSpace(void *pointer)
{
	MemoryContext context = GetMemoryChunkContext(pointer);

	return context->methods->get_chunk_space(context, pointer);
}
/*
 * GetMemoryChunkSpace
 *		Given a currently-allocated chunk, determine the total space
 *		it occupies (including all memory-allocation overhead).
 *
 * This is useful for measuring the total space occupied by a set of
 * allocated chunks.
 */
GetMemoryChunkSpace
Given a currently-allocated chunk, determine the total space
it occupies (including all memory-allocation overhead).

This is useful for measuring the total space occupied by a set of
allocated chunks.
GetMemoryChunkSpace Given a currently - allocated chunk determine the total space it occupies ( including all memory - allocation overhead ) . This is useful for measuring the total space occupied by a set of allocated chunks .
Size
GetMemoryChunkSpace(void *pointer)
{
	MemoryContext context = GetMemoryChunkContext(pointer);
	return context->methods->get_chunk_space(context, pointer);
}
Size GetMemoryChunkSpace ( void * pointer ) { MemoryContext context = GetMemoryChunkContext ( pointer ) ; return context -> methods -> get_chunk_space ( context , pointer ) ; }
GetMemoryChunkSpace
              Given a currently-allocated chunk, determine the total space
              it occupies (including all memory-allocation overhead).
GetMemoryChunkSpace Given a currently - allocated chunk determine the total space it occupies ( including all memory - allocation overhead ) .