This patch series refactor the udp memory accounting, replacing the generic implementation with a custom one, in order to remove the needs for locking the socket on the enqueue and dequeue operations. The socket backlog usage is dropped, as well.
The first patch factor out core pieces of some queue and memory management socket helpers, so that they can later be used by the udp memory accounting functions. The second patch adds the memory account helpers, without using them. The third patch replacse the old rx memory accounting path for udp over ipv4 and udp over ipv6. In kernel UDP users are updated, as well. The memory accounting schema is described in detail in the individual patch commit message. The performance gain depends on the specific scenario; with few flows (and little contention in the original code) the differences are in the noise range, while with several flows contending the same socket, the measured speed-up is relevant (e.g. even over 100% in case of extreme contention) Paolo Abeni (3): net/socket: factor out helpers for memory and queue manipulation udp: implement memory accounting helpers udp: use it's own memory accounting schema include/linux/skbuff.h | 2 +- include/linux/udp.h | 2 + include/net/sock.h | 5 ++ include/net/udp.h | 5 ++ net/core/datagram.c | 36 ++++++---- net/core/skbuff.c | 3 +- net/core/sock.c | 96 ++++++++++++++++--------- net/ipv4/udp.c | 190 +++++++++++++++++++++++++++++++++++++++++-------- net/ipv6/udp.c | 28 +++----- net/sunrpc/svcsock.c | 22 ++++-- net/sunrpc/xprtsock.c | 2 +- 11 files changed, 290 insertions(+), 101 deletions(-) -- 1.8.3.1
