Re: [RFC] Optimization for use-once pages

From: Marcelo Tosatti (
Date: Tue Jul 24 2001 - 15:27:31 EST

On Tue, 24 Jul 2001, Daniel Phillips wrote:

> Today's patch tackles the use-once problem, that is, the problem of
> how to identify and discard pages containing data likely to be used
> only once in a long time, while retaining pages that are used more
> often.
> I'll try to explain not only what I did, but the process I went
> through to arrive at this particular approach. This requires some
> background.

Well, as I see the patch should remove the problem where drop_behind()
deactivates pages of a readahead window even if some of those pages are
not "used-once" pages, right ?

I just want to make sure the performance improvements you're seeing caused
by the fix of this _particular_ problem.

If we knew the amount of non-used-once pages which drop_behind() is
deactivating under _your_ tests, we could make absolute sure about the

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