From: Christoph Lameter <clameter@engr.sgi.com>
To: Gregory Maxwell <gmaxwell@gmail.com>
Cc: linux-mm@kvack.org
Subject: Re: Preswapping
Date: Fri, 19 Aug 2005 11:39:40 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.62.0508191137350.15836@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <e692861c05081814582671a6a3@mail.gmail.com>
On Thu, 18 Aug 2005, Gregory Maxwell wrote:
> With the ability to measure something approximating least frequently
> used inactive pages now, would it not make sense to begin more
> aggressive nonevicting preswapping?
Maybe. What would be the overhead for cases in which swapping is not
needed?
> For example, if the swap disks are not busy, we scan the least
> frequently used inactive pages, and write them out in nice large
> chunks. The pages are moved to another list, but not evicted from
> memory. The normal swapping algorithm is used to decide when/if to
> actually evict these pages from memory. If they are used prior to
> being evicted, they can be remarked active (and their blocks on swap
> marked as unused) without a disk seek.
If you write out the pages then one could simply mark them as clean and
note where the location is in swap space.
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next prev parent reply other threads:[~2005-08-19 18:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-18 21:58 Preswapping Gregory Maxwell
2005-08-19 18:39 ` Christoph Lameter [this message]
2005-08-19 20:20 ` Preswapping Gregory Maxwell
2005-08-22 22:48 ` Preswapping Marcelo Tosatti
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