netdev - [PATCH 0/2 net-next v2] Bring sizeof(net

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Date:	Fri, 10 Apr 2015 15:52:36 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	davem@...emloft.net
Cc:	jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	daniel@...earbox.net
Subject: [PATCH 0/2 net-next v2] Bring sizeof(net_device) down to < 2K bytes

The size of struct net_device crossed the 2K boundary a while ago which
is a waste in combination with many net namespaces. This series brings
the size of struct net_device down to well below 2K in total size with
a typical configuration. Some reserves a several holes leave room for
further expansion.

Before:
/* size: 2176, cachelines: 34, members: 121 */

After:
/* size: 1984, cachelines: 31, members: 120 */


Thomas Graf (2):
  e1000e: Move pm_qos_req to e1000e adapter
  net_device: Reorder members to fill holes

 drivers/net/ethernet/intel/e1000e/e1000.h  |  1 +
 drivers/net/ethernet/intel/e1000e/netdev.c |  8 +++---
 include/linux/netdevice.h                  | 46 ++++++++++++++----------------
 3 files changed, 26 insertions(+), 29 deletions(-)

---
v2:
 - Moved pm_qos_req to e1000e adapter entirely as suggested by Daniel
 - Dropped patch 2 based on comment from Eric. __alignof__ is not
   reliable to derive alignment of kmalloc returned pointer.
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