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Commit e4bc3324 authored by Chen Hanxiao's avatar Chen Hanxiao Committed by Linus Torvalds
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/proc/PID/status: show all sets of pid according to ns



If some issues occurred inside a container guest, host user could not know
which process is in trouble just by guest pid: the users of container
guest only knew the pid inside containers.  This will bring obstacle for
trouble shooting.

This patch adds four fields: NStgid, NSpid, NSpgid and NSsid:

a) In init_pid_ns, nothing changed;

b) In one pidns, will tell the pid inside containers:
  NStgid: 21776   5       1
  NSpid:  21776   5       1
  NSpgid: 21776   5       1
  NSsid:  21729   1       0
  ** Process id is 21776 in level 0, 5 in level 1, 1 in level 2.

c) If pidns is nested, it depends on which pidns are you in.
  NStgid: 5       1
  NSpid:  5       1
  NSpgid: 5       1
  NSsid:  1       0
  ** Views from level 1

[akpm@linux-foundation.org: add CONFIG_PID_NS ifdef]
Signed-off-by: default avatarChen Hanxiao <chenhanxiao@cn.fujitsu.com>
Acked-by: default avatarSerge Hallyn <serge.hallyn@canonical.com>
Acked-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Tested-by: default avatarSerge Hallyn <serge.hallyn@canonical.com>
Tested-by: default avatarNathan Scott <nathans@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 201c7b72
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