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20 years later, real-time Linux makes it to the kernel - really
The work done on real-time Linux has benefitted the open-source OS for years, but it was only this week that Linus Torvalds admitted its last piece into the mainline kernel. Exactly what took so long?
Unlike general-purpose operating systems like Windows or macOS, an RTOS is built to respond to events and process data within strict time constraints, often measured in milliseconds or microseconds. Ingo Molnar, a senior Linux kernel developer, started collecting and reshaping pieces of these technologies in 2004 to build the foundation for the real-time preemption patch set PREEMPT_RT. He was using it because, like most musicians, he was too broke to buy high-end gear so, Rostedt continued, "he got a cheap laptop, with Linux and JACK, because with the real-time patch it would do good recording instead of skipping when the hard drive was writing."
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