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The Linux kernel does not lack for low-level memory managers. The venerable slab allocator has been the engine behind functions like kmalloc() and kmem_cache_alloc() for many years. More recently, SLOB was added as a pared-down allocator suitable for systems which do not have a whole lot of memory to manage in the first place. Even more recently, SLUB went in as a proposed replacement for slab which, while being designed with very large systems in mind, was meant to be applicable to smaller systems as well. The consensus for the last year or so has been that at least one of these allocators is surplus to requirements and should go. Typically, slab is seen as the odd allocator out, but nagging doubts about SLUB (and some performance regressions in specific situations) have kept slab in the game.
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