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I'm not sure- but I do vaguely remember a graph plotting CPU perf/time after a syscall- took ~microseconds to get back to ~80% of pre-syscall perf. Can't find it rn though... re:caches- yeah, they don't need clearing anymore usually afaik bc PCID. But you still have a lot of-
code to run in ring0 in most real kernels, evicting your userland code. hm- wonder if you could get cachegrind working on the Linux kernel and see how much cache pressure you get from the syscall handler
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