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

[Chen, Hanxiao]

Hi,

	Any comments?

Thanks,
- Chen

> -----Original Message-----
> From: containers-bounces at lists.linux-foundation.org
> 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 at cn.fujitsu.com>
> ---
> 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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