Re: [PATCH v2] /proc/pid/status: show all sets of pid according to ns

[Vasily Kulikov]

On Wed, May 28, 2014 at 23:27 +0400, Pavel Emelyanov wrote:
> On 05/28/2014 10:28 PM, Vasily Kulikov wrote:
> > On Wed, May 28, 2014 at 16:44 +0400, Pavel Emelyanov wrote:
> > It will be simplier
> > to parse the file -- if 'ns_ids' file contains some ID then this ID for
> > every ns can be obtained regardless of the specific ID name (SID, PID,
> > PGID, etc.).
> 
> True, but given a task PID how to determine which pid namespaces it lives in
> to get the idea of how PIDs map to each other? Maybe we need some explicit
> API for converting (ID, NS1, NS2) into (ID)?

AFAIU the idea of the patch is to add a new debugging information which
can be trivially obtained via 'cat /proc/...':

] We need a direct method of getting the pid inside containers.
] 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.

A new syscall might complicate trouble shooting by admin.

-- 
Vasily Kulikov
http://www.openwall.com - bringing security into open computing environments
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