this post was submitted on 06 Jul 2025
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Linux 6.16 Performance Regression Tracked Down In New Futex Code (www.phoronix.com)
submitted 3 weeks ago by cm0002@lemmy.cafe to c/linux@programming.dev
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[โ€“] SheeEttin@lemmy.zip 10 points 3 weeks ago (1 children)

A futex (short for fast user-space mutex) is a low-level kernel system call used in Linux (and some other operating systems) to implement synchronization primitives like mutexes, semaphores, and condition variables. It's designed to minimize the need for expensive context switches between user and kernel space by handling most operations in user space with atomic operations.