Linux kmalloc

最新推荐文章于 2024-08-28 21:14:54 发布

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本文解析了Linux内核中两种关键的内存分配标记：GFP_ATOMIC与GFP_KERNEL。GFP_ATOMIC尝试立即分配内存，任务不会因内存不足而休眠，并且为中断分配内存时必须使用它。GFP_KERNEL则是在内核空间中正常分配内存的方式，当内存不可用时会尝试释放页面。

http://www.fiveanddime.net/man-pages/kmalloc.9.html

GFP_ATOMIC

tries to allocate the memory immediately. The task will not sleep if the memory isn't available. There is a number of reserved pages for GFP_ATOMIC. For allocating memory on interrupt this has to be used.

GFP_KERNEL

is the normal way to allocate memory in the kernel space. The reserved pages will not be used, and if the memory is not available immediately, try_to_free_page() will be called.