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From: John Baldwin <jhb@freebsd.org>
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Cc: hackers@freebsd.org, Alfred Perlstein <alfred@freebsd.org>
Subject: Re: exporting subr_param values as sysctls
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On Wednesday 11 July 2007 01:26:00 pm Alfred Perlstein wrote:
> I would like to export the various parameters from subr_param.c
> into sysctl, these nodes would include the names from the following
> tunables as well as others in these files.
> 
>         TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
>         dfldsiz = DFLDSIZ;
>         TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
>         maxdsiz = MAXDSIZ;
>         TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
>         dflssiz = DFLSSIZ;
>         TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
>         maxssiz = MAXSSIZ;
>         TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
>         sgrowsiz = SGROWSIZ;
>         TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
> 
> any objections?
> 
> I don't see any obvious way to get at these values on a running
> system.

Go for it.  At work we already export the ia32 variants for amd64's 
COMPAT_IA32 as sysctls.

-- 
John Baldwin