In the early days, Linux\'s memory allocation mechanism used the buddy algorithm. When the size of the memory requested was tens or hundreds of bytes, memory fragmentation would occur, which would seriously consume system resources. Nowadays, the Slab mechanism can cache the application and recovery of physical space, eliminate the generation of external fragmentation, and reduce the amount of internal fragmentation. This paper analyzes the Slab memory allocation mechanism, its data structure, and interface functions, and then gives the implementation of the Slab mechanism.
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