有无方法能比较准确的统计brpc内存占用情况

目前通过stack_count * stack_size的方式来计算虚拟内存占用，但是不能很好的方法来统计实际物理内存的占用？想问一下这方面是否有支持。

No source file or test is named. Start by locating the existing stack_count * stack_size accounting and any memory-statistics entry points, then review how brpc exposes resource metrics. Done would require a clearly defined physical-memory measurement and corresponding support or documentation, with validation on the relevant platform.

Written by the indexing model from the issue text.