What kernel config option is required to build /proc/self/smaps

For Developers
1

My x86/64 Openwrt install seems to be missing /proc/self/smaps ... does anyone know if there is a kernel config option I am missing that creates this?

EDIT: I found the option that creates this in Openwrt's nconfig: Global build settings>Kernel build options>Enable /proc page monitoring which sets KERNEL_PROC_PAGE_MONITOR

2

PROC_PAGE_MONITOR it seems:

config PROC_PAGE_MONITOR
        default y
        depends on PROC_FS && MMU
        bool "Enable /proc page monitoring" if EXPERT
        help
          Various /proc files exist to monitor process memory utilization:
          /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
          /proc/kpagecount, and /proc/kpageflags. Disabling these
          interfaces will reduce the size of the kernel by approximately 4kb.
3

I found it/edited my post nearly at the same time as you posted. You are right!

4

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