We need a direct method of getting the pid inside containers.
If some issues occurred inside 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 two fields:
NStgid and NSpid.
a) In init_pid_ns, nothing changed;
b) In one pidns, will tell the pid inside containers:
NStgid: 1628 9 3
NSpid: 1628 9 3
** Process id is 1628 in level 0, 9 in level 1, 3 in level 2.
c) If pidns is nested, it depends on which pidns are you in.
NStgid: 9 3
NSpid: 9 3
** Views from level 1
Signed-off-by: Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>
---
v2: add two new fields: NStgid and NSpid.
keep fields of Tgid and Pid unchanged for back compatibility.
fs/proc/array.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 64db2bc..9b7e65c 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -193,6 +193,15 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
from_kgid_munged(user_ns, cred->egid),
from_kgid_munged(user_ns, cred->sgid),
from_kgid_munged(user_ns, cred->fsgid));
+ seq_puts(m, "NStgid:");
+ for (g = ns->level; g <= pid->level; g++)
+ seq_printf(m, "\t%d ",
+ task_tgid_nr_ns(p, pid->numbers[g].ns));
+ seq_puts(m, "\nNSpid:");
+ for (g = ns->level; g <= pid->level; g++)
+ seq_printf(m, "\t%d ",
+ task_pid_nr_ns(p, pid->numbers[g].ns));
+ seq_putc(m, '\n');
task_lock(p);
if (p->files)
--
1.9.0
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