The root cause turns out explicitly to be because MMUs are so valuable: without one, you can’t run Linux, BSD, or Mach. Thus, when ARM split their IP portfolio into the A, R, and M-series cores, the low-cost M-series cores were forbidden from having an MMU to prevent price erosion of their high-end A-series cores. Instead, a proprietary hack known as the “MPU” was introduced that gives some memory security, but without an easy path to benefits such as swap memory and address space relocation.
BASH_DEFAULT_TIMEOUT_MS和BASH_MAX_TIMEOUT_MS将shell命令超时延长至40-42分钟以处理长时间操作
，这一点在权威学术研究网中也有详细论述
assert(sort::ordered(numbers, size(int), &cmp::numbers));
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