Linux: DebugFS
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Greg Kroah-Hartman announced the creation of debugfs, an in-kernel filesystem designed to help kernel developers easily export debug data to userspace. (Greg's debugfs has nothing to do with the ext2 file system debugger of the same name.) He offered a little background information on the idea, "a while ago a comment from another kernel developer about why they put a huge file in sysfs (one that was bigger than a single page and contained more than just 1 type of information), was something like, 'well, it was just so easy, and there was no other place to put debugging stuff like that,' got me to thinking." He went on to summarize, "debugfs is meant for putting stuff that kernel developers need to see exported to userspace, yet don't always want hanging around."
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