Re: [PATCH -mm] mm: more likely reclaim MADV_SEQUENTIAL mappings

From: Rik van Riel
Date: Sat Jul 19 2008 - 13:59:58 EST

On Sat, 19 Jul 2008 19:31:49 +0200
Johannes Weiner <hannes@xxxxxxxxxxxx> wrote:

> File pages accessed only once through sequential-read mappings between
> fault and scan time are perfect candidates for reclaim.
> This patch makes page_referenced() ignore these singular references and
> the pages stay on the inactive list where they likely fall victim to the
> next reclaim phase.

Which is exactly what the madvise man page says about pages in

Expect page references in sequential order. (Hence, pages in
the given range can be aggressively read ahead, and may be freed
soon after they are accessed.)

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