Ftrace: The hidden light switch [LWN.net]LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing You may think, as I did, that analyzing the Linux kernel is like venturing through a dark dungeon: without the addition of advanced tracers like SystemTap, there's much that can't be seen, and can only be inferred. However, I've recently found hidden s
