>> how does one pin dynamically allocated memory in libc (so that it
>> could be used by an interrupt handler)?
> You can't, and shouldn't be trying to.

Can't?  Isn't that what mlock() does?

(I'm inclined to agree with the "shouldn't be trying to" apart; ISTM
this belongs in or near the proc struct, with added facilities
(sysctl? pseudo-device?) to allow userland to get it when desired.)

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