Slab vs Slub vs slob vs slqb

Hi,
Simple question from a newbie, i know what is SLAB is, but what is slub and slob or slqb ? what is there different ?

SLUB, SLOB, and SLQB are all different varients of slab allocators and can be chosen as a replacement for SLAB. SLUB gets the most attention these days and is the upstream default. SLOB is typically used for embedded devices and those that require a small memory footprint. SLQB was a development allocator that I believe has been abandoned.