[$] Remote per-CPU page list draining

Sometimes, a kernel-patch series comes with an exciting, sexy title. Othertimes, the mailing lists are full of patches with titles like "remoteper-cpu lists drain support". For many, the patches associated withthat title will be just as dry as the title itself. But, for those who areinterested in such things - a group that includes many LWN readers -this short patch series from Nicolas Saenz Julienne gives someinsight into just what is required to make the kernel's page allocator asfast - and as robust - as developers can make it.