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
MADV_SEQUENTIAL ranges. Yay.
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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