为什么我们需要硬件支持和软件指令来使缓存失效？
以Arm为例，它有自动缓存的硬件支持 失效如该 URL 中所述： https： //developer.arm.com/documentation/den0024/a/Multi-core-processors/Multi-core-cache-coherency-within-a-cluster
它还具有执行相同操作的软件指令手动，例如 DC 和 SYS。
我的问题是，如果硬件已经自动覆盖了这些指令，为什么以及何时需要运行这些指令？
这个问题适用于支持软件和硬件缓存失效的任何其他体系结构。
Looking at Arm as an example, it has hardware support for automatic cache
invalidation as explained in this URL:
https://developer.arm.com/documentation/den0024/a/Multi-core-processors/Multi-core-cache-coherency-within-a-cluster
It also has software instructions to do the same manually, such as DC and SYS.
My question is, why and when would you need to ever run such instructions if its already covered automatically by hardware?
This question applies to any other architecture which supports both SW and HW cache invalidation.
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