Re: [RFC] use radix_tree for non-resident page tracking

From: Nick Piggin
Date: Mon Oct 10 2005 - 08:54:50 EST

WU Fengguang wrote:
Hi Rik,
The CLOCK-Pro page replacement is quite appealing, and I'd like to
contribute an idea: How about store bookkeeping info of dropped pages
in-place in radix_tree?

The slots in radix_tree_node can be used for bookkeeping data when
the corresponding pages are dropped. When all pages in a radix_tree_node
have been dropped, it is registered in an array/list for delayed

It would be fast and simple:
- no cache-line pollution
- no extra lock (with Nick Piggin's great RCU improvement)

Just a note if you are looking into this - the last version of the
radix-tree lockless readside patches I made public IIRC had some
bugs in them which I have since fixed.


SUSE Labs, Novell Inc.

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