Re: [PATCH] mm/filemap.c: unconditionally call mark_page_accessed

[Andrea Arcangeli]

On Thu, Mar 15, 2007 at 05:44:01PM +0000, Hugh Dickins wrote:
> who removed the !offset condition, he should be consulted on its
> reintroduction.

the !offset check looks a pretty broken heuristic indeed, it would
break random I/O. The real fix is to add a ra.prev_offset along with
ra.prev_page, and if who implements it wants to be stylish he can as
well use a ra.last_contiguous_read structure that has a page and
offset fields (and then of course remove ra.prev_page).
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