linux-kernel - [RFC 0/4] reduce pid_namespace footprint when not configured

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Message-Id: <1443646163-31316-1-git-send-email-linux@rasmusvillemoes.dk>
Date:	Wed, 30 Sep 2015 22:49:19 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Oleg Nesterov <oleg@...hat.com>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org
Subject: [RFC 0/4] reduce pid_namespace footprint when not configured

A few suggestions for reducing the footprint of pid namespaces when
CONFIG_PID_NS=n. The savings are admittedly not huge:

$ scripts/bloat-o-meter /tmp/vmlinux.master vmlinux
add/remove: 0/7 grow/shrink: 30/25 up/down: 368/-1032 (-664)

Rasmus Villemoes (4):
  pid_namespace: remove ->level and ->parent for !CONFIG_PID_NS
  pid_namespace: remove .kref field for !CONFIG_PID_NS
  pid_namespace: make pid_nr_ns and pid_vnr static inlines for
    !CONFIG_PID_NS
  pid_namespace: disable_pid_allocation is unused for !CONFIG_PID_NS

 include/linux/pid.h           | 11 +++++++++++
 include/linux/pid_namespace.h | 20 ++++++++++++++++++++
 kernel/acct.c                 |  4 ++--
 kernel/pid.c                  | 24 +++++++++++++++---------
 4 files changed, 48 insertions(+), 11 deletions(-)

-- 
2.1.3

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