Memory-mapped files are an operating system feature that links a block of memory to a file.
内存映射文件是把一块内存连接到一个文件的操作系统特性。
When a block of memory is returned to the free pool, the bucket index is calculated just like it is done with allocation.
当把内存块返回给空闲池时，像分配时一样计算bucket索引。
If you allocate a block of memory on the heap that is not already in the cache, execution will stall while the contents of that memory are brought into the cache.
如果在堆的顶部分配的内存块不在缓存中，执行会在内存内容装入缓存的过程中出现延迟。
The clear_user function is used to zero a block of memory in user space. This function takes a pointer in user space and a size to zero, which is defined in bytes.
clear_user函数被用于将用户空间的内存块清零。
To avoid dangling Pointers (the dangerous situation where a block of memory is freed but a pointer still references it), you must delete the object only after the last reference is released.
为了避免悬空指针(一种危险的情况，即一块内存已经被释放了，而一个指针还在引用它)，必须在最后的引用释放之后才删除对象。
It can now just find a block of memory and then add the starting space to each of the relocatable addresses inside the code.
它只要找到一个内存块，然后把代码里每一个重定位的地址加上起始地址即可。
If the sorted data cannot fit entirely into the sort heap, which is a block of memory that is allocated each time a sort is performed, it overflows into a temporary table owned by the database.
如果无法将排序的数据整个放入排序堆中(排序堆是每次执行排序时分配的一块内存)，它就会溢出到该数据库所有的临时表中。
If the sorted data cannot fit entirely into the sort heap, which is a block of memory that is allocated each time a sort is performed, it overflows into a temporary table owned by the database.
如果无法将排序的数据整个放入排序堆中(排序堆是每次执行排序时分配的一块内存)，它就会溢出到该数据库所有的临时表中。
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