pmap可以打印进厂的map文件，能显示大小，比单纯的读/proc/<pid>/maps显示更友好
# pmap 1
1: init
0000000000010000 876K r-xp /ram/bin/busybox
00000000000fa000 4K r--p /ram/bin/busybox
00000000000fb000 4K rw-p /ram/bin/busybox
00000000000fc000 132K rw-p [heap]
0000000076cf0000 1368K r-xp /ram/lib/libc.so.6
0000000076e46000 60K ---p /ram/lib/libc.so.6
0000000076e55000 8K r--p /ram/lib/libc.so.6
0000000076e57000 4K rw-p /ram/lib/libc.so.6
0000000076e58000 40K rw-p [ anon ]
0000000076e70000 48K r-xp /ram/lib/libresolv.so.2
0000000076e7c000 60K ---p /ram/lib/libresolv.so.2
0000000076e8b000 4K r--p /ram/lib/libresolv.so.2
0000000076e8c000 4K rw-p /ram/lib/libresolv.so.2
0000000076e8d000 8K rw-p [ anon ]
0000000076e90000 268K r-xp /ram/lib/libm.so.6
0000000076ed3000 60K ---p /ram/lib/libm.so.6
0000000076ee2000 4K r--p /ram/lib/libm.so.6
0000000076ee3000 4K rw-p /ram/lib/libm.so.6
0000000076ee8000 164K r-xp /ram/lib/ld-linux-armhf.so.3
0000000076f1c000 16K rw-p [ anon ]
0000000076f20000 8K r--p /ram/lib/ld-linux-armhf.so.3
0000000076f22000 4K rw-p /ram/lib/ld-linux-armhf.so.3
000000007ebb1000 132K rw-p [stack]
000000007eded000 4K r-xp [sigpage]
000000007edee000 4K r--p [vvar]
000000007edef000 4K r-xp [vdso]
00000000ffff0000 4K r-xp [vectors]