[ovs-git] Open vSwitch: datapath: Use percpu allocator for flow-stats. (master)

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commit b0f3a2feef9889d7e23f7941858c0c40b0505d87
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=b0f3a2feef9889d7e23f7941858c0c40b0505d87
Author: Pravin B Shelar <pshelar at nicira.com>
		
datapath: Use percpu allocator for flow-stats.
		
Use percpu allocator for stats due to objection to stats array.
But percpu allocator is not designed for high churn allocation/
deallcation. so we need to avoid allocating percpu flow for
short lived flows. One cheaper way to detect flow is by checking
if 5-tuple used in RSS are masked or not. if any one of them is
masked, flow is likely shared across CPU where percpu stat
should be more scalable. And that flow should be relatively
long lived flow.

Signed-off-by: Pravin B Shelar <pshelar at nicira.com>
Acked-by: Jesse Gross <jesse at nicira.com>


-----------------------------------------------------------------------

Summary of changes:
 datapath/datapath.c     |   39 +++++++++-----------
 datapath/flow.c         |   94 ++++++++++++++++++++++++++++++-----------------
 datapath/flow.h         |   17 +++++++--
 datapath/flow_netlink.c |   56 ++++++++++++++++++++++++++--
 datapath/flow_netlink.h |    1 +
 datapath/flow_table.c   |   31 ++++++++++++++--
 datapath/flow_table.h   |    2 +-
 7 files changed, 172 insertions(+), 68 deletions(-)


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