linux-kernel - RCU Judy Array (optimisation over Radix Tree)

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Message-ID: <1696204792.18122.1472071185916.JavaMail.zimbra@efficios.com>
Date:   Wed, 24 Aug 2016 20:39:45 +0000 (UTC)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Matthew Wilcox <mawilcox@...rosoft.com>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, rp@...s.cs.pdx.edu
Subject: RCU Judy Array (optimisation over Radix Tree)

Hi Matthew,

Following our discussion at LinuxCon about Radix Trees and Judy
Array, here is a pointer to my user-space implementation
prototype of RCU Judy Array. I've simplified it a bit (removing
features you don't need, just keeping fixed-sized integer keys),
and it can still be simplified quite a bit by removing partitioned
locking support, but it may contain nice ideas for radix tree
improvements regarding the number of cache-lines touched by radix
tree lookups.

It's available in this branch:

https://github.com/urcu/userspace-rcu/tree/urcu/rcuja-simple-int

Here are Linux Plumbers 2012 slides and video from a few years ago:

http://www.efficios.com/lpc2012-scaling-rcu-judy-arrays-cache-efficient-compact-fast-and-scalable-trie

Feedback is welcome!

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com