姜哲源：小布米能这么便宜最大的一个点，在于我们基本都是使用复合材料，不是金属机身。甚至可以说，不用金属做机器人，是最成功的一个决定。
If not, the repositories will be removed after the middle of the year, along
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And that's it! It's basically just CRUD work, but with a bit of magic from Redis to auto-delete expired keys. That makes it possible to avoid having to do everything in a database and then having to also create a background service to expire keys and kids.
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The last step is executing the writes. This is achieved through copy_to_user_page(), which is essentially a memcpy. Since the destination is the writable mapping from kmap(), this just works.