The logic is in fact quite far from common.
While at it, stop accounting "---p" mappings as mapped (e.g. VSZ in top).
Nothing is mapped there (why would kernel waste RAM to map pages
which can't be accessed?).
function old new delta
read_smaps - 562 +562
read_cmdline 315 326 +11
print_smaprec 97 101 +4
procps_scan 1219 1211 -8
.rodata 115541 115533 -8
skip_whitespace_if_prefixed_with 25 - -25
procps_read_smaps 864 577 -287
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(add/remove: 1/1 grow/shrink: 2/3 up/down: 577/-328) Total: 249 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>