Anatomy of the Linux kernel--转

But memory management is much more than managing 4KB buffers. Linux provides abstractions over 4KB buffers,such as the slab allocator. This memory management scheme uses 4KB buffers as its base,but then allocates structures from within,keeping track of which pages are full,partially used,and empty. This allows the scheme to dynamically grow and shrink based on the needs of the greater system.

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