From: Alexander Duyck <alexander.h.duyck@intel.com>
Date: Tue, 23 Mar 2010 20:40:50 +0000 (+0000)
Subject: skbuff: remove unused dma_head & dma_maps fields
X-Git-Tag: v2.6.34-rc3~33^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=03e6d819c2cb2cc8ce5642669a0a7c72336ee7a2;p=pandora-kernel.git

skbuff: remove unused dma_head & dma_maps fields

The dma map fields in the skb_shared_info structure no longer has any users
and can be dropped since it is making the skb_shared_info unecessarily larger.

Running slabtop show that we were using 4K slabs for the skb->head on x86_64 w/
an allocation size of 1522.  It turns out that the dma_head and dma_maps array
made skb_shared large enough that we had crossed over the 2k boundary with
standard frames and as such we were using 4k blocks of memory for all skbs.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

Reading git-diff-tree failed