From: Nick Piggin <piggin@cyberone.com.au>
To: linux-kernel <linux-kernel@vger.kernel.org>,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [RFC][PATCH 0/4] VM split active lists
Date: Wed, 10 Mar 2004 16:10:43 +1100 [thread overview]
Message-ID: <404EA353.7080507@cyberone.com.au> (raw)
In-Reply-To: <404D56D8.2000008@cyberone.com.au>
Nick Piggin wrote:
>
> OK, the theory is that mapped pagecache pages are worth more than
> unmapped pages. This is a good theory because mapped pages will
> usually have far more random access patterns, so pagein *and* pageout
> will be much less efficient. Also, applications are probably coded to
> be more suited to blocking in read() than a random code / anon memory
> page. So a factor of >= 16 wouldn't be out of the question.
>
Just a followup - there is a small but significant bug in patch
#4/4. In shrink_zone, mapped_ratio should be divided by
nr_active_unmapped. I have this fixed, hugepage compile problems
fixed, and a mapped_page_cost tunable in place of swappiness. So
anyone interested in testing should please ask me for my latest
patch.
I'm getting some preliminary numbers now. They're pretty good,
looks like they should be similar to dont-rotate-active-list
which isn't too surprising.
Interestingly, mapped_page_cost of 8 is close to optimal for
swapping-kbuild throughput. Values of 4 and 16 are both worse.
mapped_page_cost is in units of unmapped page cost. Maybe it is
just me, but I find this scheme is more meaningful and provides
more control than swappiness.
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next prev parent reply other threads:[~2004-03-10 5:10 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-09 5:32 Nick Piggin
2004-03-09 5:33 ` [RFC][PATCH 1/4] vm-lrutopage-cleanup Nick Piggin
2004-03-09 5:33 ` [RFC][PATCH 2/4] vm-nofixed-active-list Nick Piggin
2004-03-09 5:34 ` [RFC][PATCH 3/4] vm-no-reclaim_mapped Nick Piggin
2004-03-09 5:35 ` [RFC][PATCH 4/4] vm-mapped-x-active-lists Nick Piggin
2004-03-09 5:39 ` Nick Piggin
2004-03-09 5:47 ` Mike Fedyk
2004-03-09 6:06 ` Nick Piggin
2004-03-09 7:02 ` William Lee Irwin III
2004-03-09 7:23 ` Nick Piggin
2004-03-09 7:37 ` William Lee Irwin III
2004-03-09 9:24 ` William Lee Irwin III
2004-03-09 15:26 ` Marc-Christian Petersen
2004-03-09 15:42 ` Nikita Danilov
2004-03-10 2:49 ` Nick Piggin
2004-03-10 5:10 ` Nick Piggin [this message]
2004-03-12 9:58 ` [RFC][PATCH 0/4] VM split active lists Hans Reiser
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