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authorAlexander Duyck <alexander.h.duyck@intel.com>2010-03-23 20:40:50 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-24 11:13:35 -0700
commit03e6d819c2cb2cc8ce5642669a0a7c72336ee7a2 (patch)
tree80ae5a328cf6b5a7cdbefba59a2931218923d874
parentf6b9f4b263f3178fc0f23f0e67d04386528cc727 (diff)
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>
-rw-r--r--include/linux/skbuff.h6
1 files changed, 0 insertions, 6 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 03f816a9b65..124f90cd5a3 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -190,9 +190,6 @@ struct skb_shared_info {
atomic_t dataref;
unsigned short nr_frags;
unsigned short gso_size;
-#ifdef CONFIG_HAS_DMA
- dma_addr_t dma_head;
-#endif
/* Warning: this field is not always filled in (UFO)! */
unsigned short gso_segs;
unsigned short gso_type;
@@ -201,9 +198,6 @@ struct skb_shared_info {
struct sk_buff *frag_list;
struct skb_shared_hwtstamps hwtstamps;
skb_frag_t frags[MAX_SKB_FRAGS];
-#ifdef CONFIG_HAS_DMA
- dma_addr_t dma_maps[MAX_SKB_FRAGS];
-#endif
/* Intermediate layers must ensure that destructor_arg
* remains valid until skb destructor */
void * destructor_arg;