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Date:	Mon, 17 Dec 2007 21:33:57 -0500
From:	Hideo AOKI <>
To:	David Miller <>,
	Herbert Xu <>,
	netdev <>
CC:, Takahiro Yasui <>,
	Masami Hiramatsu <>,
	Satoshi Oshima <>,
	Bill Fink <>,
	Andi Kleen <>,
	Evgeniy Polyakov <>,
	Stephen Hemminger <>,,
	Yumiko Sugita <>
Subject: [PATCH 0/4] [UDP]: memory accounting and limitation (take 11)


I updated patch set of  UDP memory accounting and limitation.

The spin lock that I used in previous take was removed from datagram
memory accounting functions. As David commented, I used socket lock
and backlog processing to keep consistency of memory accounting like
TCP. I added socket lock to places where skbuff is freed, since the
locking is needed to change sk_forward_alloc only.

Moreover, I revised memory accounting functions. As Herbert commented,
I stopped using large inline function and tried to reduce amount of
inline functions.

The patch set was tested on net-2.6 tree.

Changelog take 10 -> take 11:
 * stopped using spin lock in memory accounting function
 * socket lock and backlog processing were used to avoid conflict
   between receive system call processing and BH
 * revised memory accounting functions
 * stooped changing sock_queue_rcv_skb() and skb_set_owner_r()
 * added __udp_queue_rcv_skb to set proper destructor
 * removed udp_set_owner_r()
 * removed reclaim in inet_sock_destruct()

Changelog take 9 -> take 10:
 * supported using sk_forward_alloc
 * introduced several memory accounting functions with spin lock
 * changed detagram receive functions to be able to customize
 * fixed accounting bugs in previous takes

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

Best regards,
Hideo Aoki

Hitachi Computer Products (America) Inc.

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