UDP memory accounting and limitation (take 9)

Hello,

This is the latest patch set of UDP memory accounting and limitation.

I implemented memory schedule functions for datagram protocols
like stream protocols. Moreover, to call memory schedule functions
from IP layer, I added a wrapper function, sk_wmem_schedule(), as
I proposed last week:

http://www.spinics.net/lists/netdev/msg47950.html

I would like to know whether this is acceptable.

In addition, I restructured patch set. I merged UDP IPv4 memory
accounting code at once and re-divided into introducing sysctls patch
and accounting patch. I think that new structure is easier to review
than previous ones.

The patch set is for net-2.6.

By the way, sk_forward_alloc support is my future work. I'm going
to do it if this patch set is acceptable.


Changelog take 8 -> take 9:
 * introduced mem_schdeule functions for datargram protocols
 * removed protocol check function, from patch set
 * restructured patch set

Changelog take 7 -> take 8:

 * sk_datagram_pages(): avoided using divide instruction
 * udp_recvmsg(): fixed referring released truesize in accounting


Changelog take 6 -> take 7:
 * renamed /proc/sys/net/ipv4/udp_rmem to
   /proc/sys/net/ipv4/udp_rmem_min
 * renamed /proc/sys/net/ipv4/udp_wmem to
   /proc/sys/net/ipv4/udp_wmem_min
 * rebased to net-2.6


Changelog take 5 -> take 6:

 * removed minimal limit of /proc/sys/net/ipv4/udp_mem
 * added udp_init() for default value calculation of parameters
 * added /proc/sys/net/ipv4/udp_rmem and
   /proc/sys/net/ipv4/udp_rmem
 * added limitation code to ip_ufo_append_data()
 * improved accounting for receiving packet
 * fixed typos
 * rebased to 2.6.24-rc1


Changelog take 4 -> take 5:

 * removing unnessesary EXPORT_SYMBOLs
 * adding minimal limit of /proc/sys/net/ipv4/udp_mem
 * bugfix of UDP limit affecting protocol other than UDP
 * introducing __ip_check_max_skb_pages()
 * using CTL_UNNUMBERED
 * adding udp_mem usage to Documentation/networking/ip_sysctl.txt


Best regards,
Hideo Aoki

--
Hitachi Computer Products (America) Inc.
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