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Paraphrasing from the [http://relayfs.sourceforge.net/ official website:]
Relayfs is a filesystem for the Linux operating system that makes per-CPU kernel buffers look like files (that can be mmap'ed and directly read) from non-kernel (i.e., normal) programs. This makes it easy for non-kernel programs to get potentially large amounts of data from the kernel.
Status
Relayfs was included in Andrew Morton's mm kernel tree from 2.6.11-mm3 until 2.6.15-mm3, when it was added to the mainline kernel version 2.6.14 [http://relayfs.sourceforge.net/news.html].
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