All anonymous segments are aggregated into a single measurement, as are
all segments smaller than 512 KiB.

Example output:

      142.89: resident-according-to-smaps
       97.84: - anonymous (rw-p)
       23.98: - /home/njn/moz/servo/components/servo/target/servo (r-xp)
        6.58: - [heap] (rw-p)
        5.36: - other
        3.51: - /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (r-xp)
        1.33: - /lib/x86_64-linux-gnu/libc-2.19.so (r-xp)
        0.93: - /home/njn/moz/servo/components/servo/target/servo (r--p)
        0.76: - /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.20 (r-xp)
        0.74: - /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0 (r-xp)
        0.50: - /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 (r-xp)
        0.50: - /lib/x86_64-linux-gnu/libglib-2.0.so.0.4200.1 (r-xp)
        0.45: - /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1.2.0 (r-xp)
        0.43: - /lib/x86_64-linux-gnu/libm-2.19.so (r-xp)