RFC: system-wide default tunables

[DJ Delorie]

Siddhesh Poyarekar <siddhesh@gotplt.org> writes:
> Actually I wasn't thinking of any conf file related constraint markup, I 
> was thinking of TUNABLE_CALLBACKs encoding constraints in whichever way 
> they deem fit.  e.g. for ibt it could be:
>
> void
> TUNABLE_CALLBACK (set_x86_ibt) (tunable_val_t *valp)
> {
>    if (!strcmp (valp->system_default, "always_on"))
>      return;
>
>    /* Otherwise read the value.  */
> }

So the tunable definition *itself* decides whether the sysadmin wants to
override a user?

Or are you saying the tunable *value* describes the constraint?