On 05/28/2014 02:24 PM, Chen Hanxiao wrote: > We need a direct method of getting the pid inside containers.
But there's more generic issue -- some day we'll need to know not only PIDs as seen from different namespaces, but also SIDs and PGIDs. > 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 <chenhanx...@cn.fujitsu.com> > --- > 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) > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
