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

[Nick Piggin]

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
> reclaim.
>
> 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.

Thanks,
Nick

--
SUSE Labs, Novell Inc.

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