(KB): New macro.
(big): Lower the size to 64*MB. Should be enough for another year... ;-)
(gettime): Fix typo and lower the assumed cache-line size from 64
to 8 bytes just to be safe across platforms.
(measure_init): Lower N from 1000 to 100.
(cursor): Add some padding between each unw_cursor_t to avoid
benefitting from cache-line sharing.
(uc): Likewise.
Warm up the TLB before measuring the cold-cache cases.
(main): Unlimit the max. stack-size just in case.
Write to "big" to ensure it's backed by real memory
(not just by the zero page).
(Logical change 1.194)
(maxlevel): New global variable.
(measure_unwind): Return init/step times via arg pointers.
(f1): Pass through init/step pointers.
(doit): New function.
(main): Use doit() instead of open code.
(Logical change 1.130)
