代码拉取完成，页面将自动刷新
Since CMA is used more widely, it's worth to have CMA allocation
statistics into vmstat. With it, we could know how agressively system
uses cma allocation and how often it fails.
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openEuler-21.09合入如下相关补丁：
a4f5e3f23cd0a1 mm: vmstat: add cma statistics
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