Re: [PATCH 1/9] readahead: introduce PG_readahead

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> We have the advantage that if the kernel very occasionally gets the wrong
> result for PageReadahead(page), nothing particularly bad will happen, so we
> can do racy things.
 
On 64bit there is no particular shortage of page flags. If you ever do
racy things please do them 32bit only.

-Andi

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