Messages in this thread | | | Date | Fri, 21 Feb 2003 11:15:38 -0800 | From | William Lee Irwin III <> | 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.
$ echo $(( (689*1024)/156027.0 )) 4.5218840328917427
So the space flushed down the toilet there is also relatively large. Approximately 4.5 PTE's per pagetable page, or a utilization of:
$ echo $(( (100*689)/156027.0 )) 0.44159023758708427
percent.
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