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

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Date:	Fri, 26 Sep 2014 10:20:02 +0000
From:	"Chen, Hanxiao" <chenhanxiao@...fujitsu.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"containers@...ts.linux-foundation.org" 
	<containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>
CC:	Richard Weinberger <richard.weinberger@...il.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Mateusz Guzik <mguzik@...hat.com>,
	David Howells <dhowells@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: RE: [PATCHv3 2/2] /proc/PID/status: show all sets of pid according
 to ns

Hi,

> -----Original Message-----
> From: containers-bounces@...ts.linux-foundation.org
> [mailto:containers-bounces@...ts.linux-foundation.org] On Behalf Of Chen
> Hanxiao
> Sent: Wednesday, September 24, 2014 6:00 PM
> To: containers@...ts.linux-foundation.org; linux-kernel@...r.kernel.org
> Cc: Richard Weinberger; Serge Hallyn; Oleg Nesterov; Mateusz Guzik; David Howells;
> Eric W. Biederman
> 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
> 

This patch is simple, useful and safe.
But currently there is not any feedbacks.

Any comments or ideas? 

Thanks,
- Chen