Ehh?
Linux already marks pages referenced when it does read-ahead. Look in
"add_to_page_cache()", which does this as a part of adding the page to
the global page cache hash queues.
So if this patch makes a difference, it must be for some other reason
than marking the read-ahead page referenced.
I'd still be interested to know _which_ part of the patch makes such a
big difference to you. I suspect the only part that _could_ make a
difference is the count_max/count_min changes (which may well make a ton
of sense, the reason why those counts were elevated at one point no
longer exists).
Linus
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