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Big Linux Patch Series Shakes Up The Scheduler Code For Anyone With Only One CPU Core
For anyone still happening to have only one CPU core in their system and running a uni-processor 'UP' kernel build without any simultaneous multi-processing (SMP) support enabled, a big patch series posted today for the Linux kernel may affect you.
Even embedded systems and years-old Intel Celeron processors selling for ~$20 retail these days offer at least two physical CPU cores. The days of having only a single CPU core and be running a uniprocessor "UP" kernel configuration are extremely rare in 2025. Ingo does acknowledge though that this will lead to some bloat for anyone still relying on a UP kernel:"Note that the approach I chose is pretty blunt and straightforward, to make sure this conversion is as bug-free as possible.
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