Eric Dumazet 87fb4b7b53 net: more accurate skb truesize ... skb truesize currently accounts for sk_buff struct and part of skb head. kmalloc() roundings are also ignored. Considering that skb_shared_info is larger than sk_buff, its time to take it into account for better memory accounting. This patch introduces SKB_TRUESIZE(X) macro to centralize various assumptions into a single place. At skb alloc phase, we put skb_shared_info struct at the exact end of skb head, to allow a better use of memory (lowering number of reallocations), since kmalloc() gives us power-of-two memory blocks. Unless SLUB/SLUB debug is active, both skb->head and skb_shared_info are aligned to cache lines, as before. Note: This patch might trigger performance regressions because of misconfigured protocol stacks, hitting per socket or global memory limits that were previously not reached. But its a necessary step for a more accurate memory accounting. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Andi Kleen <ak@linux.intel.com> CC: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2011-10-13 16:05:07 -04:00
..
af_iucv.c	net: more accurate skb truesize	2011-10-13 16:05:07 -04:00
iucv.c	iucv: introduce loadable iucv interface	2011-08-13 01:10:15 -07:00
Kconfig	iucv: kernel option for z/VM IUCV and HiperSockets	2011-08-13 01:10:16 -07:00
Makefile