显示相关科普：
https://happyseeker.github.io/kernel/2016/07/22/memory-management-from-graphic-card-view.html
https://happyseeker.github.io/kernel/2016/05/24/about-framebuffer.html
android：
https://www.jianshu.com/p/dd0b38832346
上面的文章提到了ion：https://lwn.net/Articles/480055/
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