netdev - [RFC v2 0/2] proc connector: get namespace events

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Date:   Sat, 15 Oct 2016 14:26:08 +0200
From:   Alban Crequy <alban.crequy@...il.com>
To:     linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     Jesper Derehag <jderehag@...mail.com>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Evgeniy Polyakov <zbr@...emap.net>,
        Jiri Benc <jbenc@...hat.com>, Tejun Heo <tj@...nel.org>,
        Aditya Kali <adityakali@...gle.com>,
        Iago Lopez Galeiras <iago@...volk.io>,
        Dimitri John Ledkov <dimitri.j.ledkov@...el.com>,
        Aaron Campbell <aaron@...key.org>,
        Alban Crequy <alban@...volk.io>
Subject: [RFC v2 0/2] proc connector: get namespace events

This is v2 of the patch set to add namespace events in the proc connector.

The act of a process creating or joining a namespace via clone(),
unshare() or setns() is a useful signal for monitoring applications.

I am working on a monitoring application that keeps track of all the
containers and all processes inside each container. The current way of
doing it is by polling regularly in /proc for the list of processes and
in /proc/*/ns/* to know which namespaces they belong to. This is
inefficient on systems with a large number of containers and a large
number of processes.

Instead, I would inspect /proc only one time and get the updates with
the proc connector. Unfortunately, the proc connector gives me the list
of processes but does not notify me when a process changes namespaces.
So I would still need to inspect /proc/*/ns/*.

 (1) Add namespace events for processes. It generates a namespace event each
     time a process changes namespace via clone(), unshare() or setns().

 (2) Add a way for userspace to detect if proc connector is able to send
     namespace events.

Changes since RFC-v1: https://lkml.org/lkml/2016/9/8/588

* Supports userns.

* The reason field says exactly whether it is clone/setns/unshare.

* Sends aggregated messages containing details of several namespaces
  changes. Suggested by Evgeniy Polyakov.

* Add patch 2 to detect if proc connector is able to send namespace events.

This patch set is available in the git repository at:

  https://github.com/kinvolk/linux.git alban/proc_ns_connector-v2-5

Alban Crequy (2):
  proc connector: add namespace events
  proc connector: add a "get feature" op

 drivers/connector/cn_proc.c  | 163 ++++++++++++++++++++++++++++++++++++++++---
 include/linux/cn_proc.h      |  25 +++++++
 include/uapi/linux/cn_proc.h |  27 ++++++-
 kernel/fork.c                |  10 +++
 kernel/nsproxy.c             |   6 ++
 5 files changed, 220 insertions(+), 11 deletions(-)

-- 
2.7.4