about buddy and slab allocators

[Xiangfei Jia <xjianz@xxxxxxxxx>]

I'm reading a book about kernel memory management. In the book, there
is one sentence saying "with this combination of allocators (buddy and
slab allocators), the kernel can ensure the amount of memory wasted due
to internal fragmentation is kept to a minimum.".  From my
understanding, I think the allocators are used to deal with external
fragmentation, not internal. Am I right? Please correct me!!!

Fei