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by amluto
3955 days ago
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There were only ever "vsyscall" entries for three syscalls: time, gettimeofday, and getcpu. On recent kernels, the vsyscalls are actually the slowest way of all to ask for the time or the cpu number. They're only supported at all as a fallback, and the fallback is very slow, because it tries to mitigate exploit risks due to having code at a fixed address. https://lwn.net/Articles/446528/ |
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