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SubjectRe: Measured overhead of timer interrupts

On 22 Jul 1999, Andi Kleen wrote:

> It is a kernel bug, HZ is not exported. Actually two, because none of
> the /proc should have used it as units, but that cannot be fixed anymore.

why cannot it be fixed?

> It is easy to add a read-only sysctl for HZ though and make netstat use
> this, but this won't fix the trillions of other /proc parsers.

we do not want to export HZ, why should we? HZ has no meaning to anything
else than the kernel. If the kernel exports HZ-dependent values into
/proc, then that has to be fixed. (yes it might be painful in some cases)
HZ might even go away in future kernels - what if we start using
nonperiodic timer interrupts?

-- mingo


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