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

[Andrew Morton]

On Thu, 17 May 2007 06:47:53 +0800 Fengguang Wu <wfg@xxxxxxxxxxxxxxxx> wrote:

> Introduce a new page flag: PG_readahead.

Is there any way in which we can avoid adding a new page flag?

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.

>From a quick peek, it appears that PG_readahead is only ever set against
non-uptodate pages.  If true we could perhaps exploit that: say,
PageReadahead(page) == PG_referenced && !PG_uptodate?
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