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UDP memory accounting and limitation (take 8)

From:  Hideo AOKI <>
To:  David Miller <>, netdev <>
Subject:  [PATCH 0/5] UDP memory accounting and limitation (take 8)
Date:  Thu, 15 Nov 2007 16:44:13 -0500
Message-ID:  <>
Cc:  Satoshi Oshima <>, Herbert Xu <>, Bill Fink <>, Andi Kleen <>, Evgeniy Polyakov <>, Stephen Hemminger <>,, Yumiko Sugita <>, Hideo AOKI <>
Archive-link:  Article


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

I modified sk_datagram_pages() to avoid using divide instruction.

In addition, I also fixed memory accounting code in udp_recvmsg(),
since, in previous takes, the accounting code referred released
sk_buff's truesize. The fix can be found in 3rd patch of the patch set.

The patch set is for net-2.6. Please apply.

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
 * renamed /proc/sys/net/ipv4/udp_wmem to
 * 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
 * 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()
 * adding udp_mem usage to Documentation/networking/ip_sysctl.txt

Best regards,
Hideo Aoki

Hitachi Computer Products (America) Inc.
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