RE: [PATCHv3 2/2] /proc/PID/status: show all sets of pid according to ns

From: Chen, Hanxiao
Date: Thu Sep 25 2014 - 10:00:08 EST


Hi,

Any comments?

Thanks,
- Chen

> -----Original Message-----
> From: containers-bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx
> Subject: [PATCHv3 2/2] /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
>
> Signed-off-by: Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>
> ---
> v3: add another two fielsd: NSpgid and NSsid.
> v2: add two new fields: NStgid and NSpid.
> keep fields of Tgid and Pid unchanged for back compatibility.
>
> fs/proc/array.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/fs/proc/array.c b/fs/proc/array.c
> index cd3653e..c30875d 100644
> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c
> @@ -193,6 +193,23 @@ 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_puts(m, "\nNSpgid:");
> + for (g = ns->level; g <= pid->level; g++)
> + seq_printf(m, "\t%d ",
> + task_pgrp_nr_ns(p, pid->numbers[g].ns));
> + seq_puts(m, "\nNSsid:");
> + for (g = ns->level; g <= pid->level; g++)
> + seq_printf(m, "\t%d ",
> + task_session_nr_ns(p, pid->numbers[g].ns));
> + seq_putc(m, '\n');
>
> task_lock(p);
> if (p->files)
> --
> 1.9.0
>
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