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Linus Torvalds Doesn’t Understand User Space Storage

Jun 29, 2011, 12:01 (9 Talkback[s])

"Hypervisors are the modern micro kernels. Microkernel is not about size, but about what should be in kernel mode. Linus's ideas about filesystems are rather old. He thinks that it is a bad idea to push the filesystems to user space, leaving the memory manager to run in kernel mode.

"The bulk of the memory buffers are filesystem contents, and you need both of them to work together. This is true for root filesystems with relatively small amounts of data but not true when it comes to scalable storage systems. Don't let the kernel manage the memory for you. In my opinion, Kernel-space does a poor job of handling large amounts of memory with 4k pages."

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