写入器永远不会阻塞，因为缓冲可以无限扩展，或者至少到了底层内存系统设置的限制为止。
Writers are never blocked because the buffer capacity can be expanded indefinitely, or at least until the limit imposed by the underlying memory system is reached.
这个内存扩展因数为操作系统提供了有关用户尝试实现的有效内存容量的输入，即OS应尝试纳入内存的数据量。
This memory expansion factor provides input to the operating system on the effective memory capacity the user is trying to achieve, and thus, the amount of data the OS should try to fit into memory.
由于Linux在虚拟系统中应用的增加—尤其是具有多处理器和大量内存的系统—扩展内存的使用对性能非常重要。
As Linux finds increasing use in virtualized systems-particularly those with many processors and vast amounts of memory-the ability to scale memory usage becomes critical to performance.
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