An anonymous reader writes "In a relatively technical discussion about the merits of Copy On Write (COW) versus a very new Linux kernel system call named vmsplice(), Linux creator Linus Torvalds had some harsh words for Mach and FreeBSD developers that utilize COW: 'I claim that Mach people (and apparently FreeBSD) are incompetent idiots. Playing games with VM is bad. memory copies are _also_ bad, but quite frankly, memory copies often have _less_ downside than VM games, and bigger caches will only continue to drive that point home.' The discussion goes on to explain how the new vmsplice() avoids this extra overhead."
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