Messages in this thread | | | Date | Sun, 13 Apr 2008 13:53:17 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 1/3] Add prctl commands PR_GET_TSC and PR_SET_TSC |
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Andi Kleen wrote: >> I think what Erik is trying to do is to make it possible to disable as >> many of these in the kernel as possible; I/O is easy, it's off by >> default; RDTSC and RDPMC can be disabled in the kernel, and I think >> even XSTORE can be disabled. > > I'm a little sceptical it will work reliably, but we'll see. > > There's also LSL (forgot that earlier). It is used by the vgetcpu() > because it's faster than CPUID or RDTSCP. Kernel > sets a magic segment up which has different limits for different CPUs. >
Yeah, that's unlikely to be found in code that isn't actively looking for it, though.
-hpa
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