Messages in this thread | | | Date | Thu, 22 Jul 1999 17:11:10 +0200 | From | Andi Kleen <> | Subject | Re: Measured overhead of timer interrupts |
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On Thu, Jul 22, 1999 at 05:02:14PM +0200, Ingo Molnar wrote: > > 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?
because that would break the interface.
> > > 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?
Actually, POSIX wants it (sysconf(_SC_CLK_TCK)). glibc currently returns the HZ value it was compiled with, but that is hardly satisfying.
I agree that the time related sysctls/proc files should be fixed, but I'm afraid it is too late.
-Andi
-- This is like TV. I don't like TV.
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