Re: [PATCH 1/3] Add prctl commands PR_GET_TSC and PR_SET_TSC

[Andi Kleen]

>
> 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.

-Andi

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