Re: Increased Buffers due to patch 56e49d (vmscan: evict use-oncepages first), but why exactly?

[Rik van Riel]

On 12/08/2009 10:54 AM, Christian Ehrhardt wrote:

> btw thanks for the explanation Rik, the file/blockdev association was
> exactly what I was missing in my thoughts.
> While my question was more intended to ask where in code these
> differentiation is made I'm perfectly fine with having it just working
> knowing that file/blockdev association is the key.

Actually, the file/blockdev association is just a coincidence,
due to the way your benchmark works.

The key is "page touched once" vs "page touched multiple times".

In eg. a database workload, I would expect much more file data
to be on the active list.  Specifically the file data corresponding
to the database indexes.

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