Re: [resend][PATCH v10 1/2] /proc/PID/status: show all sets of pid according to ns

[Serge E. Hallyn]

On Sun, Feb 22, 2015 at 07:48:04PM +0800, Chen Hanxiao wrote:
> 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

So obviously (since I acked it) I see no problems with this patch or
the api, but it occurs to me that you have not cc:d linux-api?  Since
a procfile addition is something we're stuck with for eternity, it
seems worth it.  If we get an ack from there, then i'd say email
to Linus directly.  Putting this through -mm doesn't really seem
necessary given its nature.

> Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
> Acked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
> 
> Tested-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
> Tested-by: Nathan Scott <nathans@xxxxxxxxxx>
> 
> Signed-off-by: Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>
> ---
> v10: remove trailing space of pid numbers
>      rebased on 3.19
> v9: rebased on 3.19-rc1
> No change from v4-v8
> 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 | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/fs/proc/array.c b/fs/proc/array.c
> index 1295a00..d79bad9 100644
> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c
> @@ -188,6 +188,22 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
>  			   from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
>  	put_cred(cred);
>  
> +	seq_puts(m, "\nNStgid:");
> +	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');
>  }
>  
> -- 
> 2.1.0
> 
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