ARM Linux高端内存分析(下)
上半部分分析了kmap_atomic里的low memory page地址的获取，那如何获取high memory page的virtual address呢。kmap_atomic分析入口就是pagefault_disable，查看定义：/*
* These routines enable/disable the pagefault handler in that
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ARM Linux高端内存分析(上)
目录What is high memorykmap_atomickunmap_atomicWhat is high memory先看下内核文档kernel3.18 vm/highmem.txt的说明：High memory (highmem) is used when the size of physical memory approaches orexceeds the...阅读全文