On 2018/4/12 下午1:22, Oliver Yang wrote:
On 2018/4/12 下午12:58, chenggang.qin@xxxxxxxxxxxxxxxxx wrote:
From: Andy Lutomirski <luto@xxxxxxxxxx>
commit: 9d05041679904b12c12421cbcf9cb5f4860a8d7b upstream
32-bit kernels handle nested NMIs in C. Enable the exact same
handling on 64-bit kernels as well. This isn't currently
necessary, but it will become necessary once the asm code starts
allowing limited nesting.
好奇为什么移植这个 patch？
Linux Nested NMI 的设计很丑陋，过去主要是为了 trace 和 debug 不得已而为之，我们踩中啥坑了？
执行perf，触发了NMI Nesting：
https://aone.alibaba-inc.com/issue/14185470