它通过计算获得或者损失的资金数额同投入的资金数额的比例而得，通常以百分数的形式表示。
It is calculated as a ratio of the money gained or lost on that investment relative to the amount of money invested, and is typically stated as a percentage rather than as a dollar value.
在这种情况下，可以使用 vmm_default_pspa 参数指定提升需要的 4KB 页面数小于 16 个，表示为百分数形式。
In this case, you can use the vmm_default_pspa parameter to specify that less than 16 4KB pages are required for promotion, expressed as a percentage.
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