>On Thu, Nov 02, 2000 at 12:45:30AM -0800, David Greenman wrote:
>> >Interesting. THis needs about two bytes per page for the counter?
>>
>> Actually, we found that a single byte per page was sufficient. Pages tended
>> to be either heavily accessed or rarely accessed. Even in the unusual case
>> where all pages are frequently accessed, the page reclaim rate (and thus
>> adjustment rate of the page references count) increases high enough to still
>> provide for a decent distribution of the counters and for the page LOU to be
>> effective.
>
>One byte sounds good for i386.
>Maybe it makes sense to have it 4 or 8 byte on risc platforms.
>I wonder if it's a critical path and if there are more of this in
>the kernel source.
No, space consumption of the vm_page data structure is by far the greatest
concern.
-DG
David Greenman
Co-founder, The FreeBSD Project - http://www.freebsd.org
President, TeraSolutions, Inc. - http://www.terasolutions.com
Pave the road of life with opportunities.
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