netdev - [PATCH net-next 0/6] tcp_metrics: Network namespace bloat reduction

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Message-ID: <87h9tu114z.fsf_-_@x220.int.ebiederm.org>
Date:	Mon, 09 Mar 2015 13:22:52 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Miller <davem@...emloft.net>
Cc:	edumazet@...gle.com, netdev@...r.kernel.org,
	stephen@...workplumber.org, nicolas.dichtel@...nd.com,
	roopa@...ulusnetworks.com, hannes@...essinduktion.org,
	ddutt@...ulusnetworks.com, vipin@...ulusnetworks.com,
	shmulik.ladkani@...il.com, dsahern@...il.com
Subject: [PATCH net-next 0/6] tcp_metrics: Network namespace bloat reduction

This is a small pile of patches that convert tcp_metrics from using a
hash table per network namespace to using a single hash table for all
network namespaces.

This is broken up into several patches so that each small step along
the way could be carefully scrutinized as I wrote it, and equally so
that each small step can be reviewed.

There are two minor cleanups included.  The addition of a missing panic
when the tcp_metrics hash table can not be allocated during boot and the
removal of the return code from tcp_metrics_flush_all

The motivation for this change is that the tcp_metrics hash table at
128KiB is the single largest component of a freshly allocated network
namespace.

Eric W. Biederman (6):
      tcp_metrics: panic when tcp_metrics can not be allocated
      tcp_metrics: Mix the network namespace into the hash function.
      tcp_metrics: Add a field tcpm_net and verify it matches on lookup
      tcp_metrics: Remove the unused return code from tcp_metrics_flush_all
      tcp_metrics: Rewrite tcp_metrics_flush_all
      tcp_metrics: Use a single hash table for all network namespaces.

 include/net/netns/ipv4.h |   2 -
 net/ipv4/tcp_metrics.c   | 118 +++++++++++++++++++++++++++++------------------
 2 files changed, 73 insertions(+), 47 deletions(-)

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