12-02-2018
ps looks into /proc, so having a namespace in /proc is the correct way.
(Having a namespace in ps would be inconsistent.)
Each mount of /proc is a new interface to the kernel. There is no "fowarding" of an existing mount. The only mount forwarding is the bind mount (it should work with all file system types including /proc).
/proc works a bit like /dev where each file is a driver.
The kernel is not writing out but mapping out. If you access a file it is actually written out.
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LEARN ABOUT FREEBSD
linprocfs
LINPROCFS(5) BSD File Formats Manual LINPROCFS(5)
NAME
linprocfs -- Linux process file system
SYNOPSIS
linproc /compat/linux/proc linprocfs rw 0 0
DESCRIPTION
The Linux process file system, or linprocfs, emulates a subset of Linux' process file system and is required for the complete operation of
some Linux binaries.
The linprocfs provides a two-level view of process space. At the highest level, processes themselves are named, according to their process
ids in decimal, with no leading zeros. There is also a special node called self which always refers to the process making the lookup
request.
Each node is a directory containing several files:
exe A reference to the vnode from which the process text was read. This can be used to gain access to the process' symbol table, or to
start another copy of the process.
mem The complete virtual memory image of the process. Only those addresses which exist in the process can be accessed. Reads and writes
to this file modify the process. Writes to the text segment remain private to the process.
Each node is owned by the process's user, and belongs to that user's primary group, except for the mem node, which belongs to the kmem group.
FILES
/compat/linux/proc The normal mount point for the linprocfs.
/compat/linux/proc/cpuinfo CPU vendor and model information in human-readable form.
/compat/linux/proc/meminfo System memory information in human-readable form.
/compat/linux/proc/pid A directory containing process information for process pid.
/compat/linux/proc/self A directory containing process information for the current process.
/compat/linux/proc/self/exe The executable image for the current process.
/compat/linux/proc/self/mem The complete virtual address space of the current process.
EXAMPLES
To mount a linprocfs file system on /compat/linux/proc:
mount -t linprocfs linproc /compat/linux/proc
SEE ALSO
mount(2), unmount(2), procfs(5), pseudofs(9)
HISTORY
The linprocfs first appeared in FreeBSD 4.0.
AUTHORS
The linprocfs was derived from procfs by Pierre Beyssac. This manual page was written by Dag-Erling Smorgrav, based on the procfs(5) manual
page by Garrett Wollman.
BSD
August 10, 1994 BSD