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    SubjectRe: sysconf (was Re: RLIM_INFINITY inconsistency between archs)
    Ralf Baechle wrote:
    >
    > On Thu, Jul 27, 2000 at 05:34:54PM -0700, H. Peter Anvin wrote:
    >
    > > > Linus is right, no major structural change is necessary. For example,
    > > > here's a very short patch necessary to support __SC_CLK_TCK (which is
    > > > probably the most interesting of the sysconf() variables as far as I'm
    > > > concerned.) It's only a 5-line patch. (See below)
    > >
    > > I don't think we want to do this! IMO, HZ should not get exported to
    > > user space *AT ALL*. Instead, for the few interfaces that need it,
    > > we'll export a "user space HZ" (USER_HZ) which is fixed. No need for
    > > a kernel hack. When we support nonstandard values for HZ, we need to
    > > fix the few interfaces that actually export jiffies values to convert
    > > from "user jiffies" to real jiffies.
    >
    > Due to machines that can't program their clocks to the standard clock rate
    > I've created a patch which does things somewhat different. I found the
    > USER_HZ approach to be insufficient, there is a lot of software out there
    > which uses <linux/param.h>'s HZ definition directly upto and including the
    > current glibc development snapshot, so you're more or less forced to live
    > with HZ.
    >

    #define USER_HZ 100

    #ifdef __KERNEL__
    #define HZ 1024
    #else
    #define HZ USER_HZ
    #endif

    --
    <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
    "Unix gives you enough rope to shoot yourself in the foot."
    http://www.zytor.com/~hpa/puzzle.txt

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