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Date: Fri, 21 Feb 2003 11:27:06 -0800
From: William Lee Irwin III <wli@holomorphy.com>
To: Rik van Riel <riel@imladris.surriel.com>, Andrew Morton <akpm@digeo.com>,
       "Martin J. Bligh" <mbligh@aracnet.com>, linux-kernel@vger.kernel.org,
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Subject: Re: [Lse-tech] Re: Performance of partial object-based rmap
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On Fri, Feb 21, 2003 at 02:00:10AM -0800, William Lee Irwin III wrote:
>> nr_page_table_pages                  689
>> which amounts to 2756KB RAM used for PTE's, demonstrating large
> Pagetables are also grossly fragmented. From the same sample:
> nr_reverse_maps                   156027
> To preempt the FAQ, this is the number of reverse mappings performed,
> where one is done for every instantiated non-swap PTE.

ARGH too early in the morning.

$ echo $(( (100*156027.0)/(689*1024) ))
22.11467593432511
percent utilization

or

$ echo $(( 156027.0/689 ))            
226.45428156748912

PTE's per pagetable page.


-- wli
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