Note: there is usually no system call that can be used to return unused memory back to the operating system. when you free memory, the memory manager cannot return this memory back to the operating system. If this freed memory is never used again, it will eventually be paged out to disk - but won't be freed until the process exits. Thus, the ammount of virtual memory used by a process always increases - never decreases. That is, unless...:
里面的一个note讲的还是蛮清楚的
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