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List:       linux-390
Subject:    Re: Linux file system cache
From:       Rob van der Heij <rvdheij () velocitysoftware ! com>
Date:       2010-02-14 14:58:32
Message-ID: 6227a1ef1002140658i28c9ae4aybdc6c81d8f5f3d6b () mail ! gmail ! com
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On Sun, Feb 14, 2010 at 7:20 AM, Offer Baruch <offerbaruch@gmail.com> wrote:

> One more thing I would like to ask...
> In the past we were all talking about cmm-2 and how great it will be that
> the cache pages will be marked so that z/VM will recognize them.
> What happened there? Why isn't that available?

The full CMM-2 solution was considered too intrusive on the generic
Linux kernel source and was not accepted for inclusion.

What we have now is sometimes referred to as CMM-Lite (a subset of the
original CMM-2 code). Whether the remaining function still is
effective needs to be seen. It also depends a lot on the Linux
application configuration. Unfortunately it completely lacks
instrumentation, so the only evidence we've seen are lab experiments
specifically designed to demonstrate the function.

Rob
--
Rob van der Heij
Velocity Software
http://www.velocitysoftware.com/

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