Re: [RFC 2/3] LVHPT - Setup LVHPT

From: Ian Wienand <ianw_at_gelato.unsw.edu.au>
Date: 2006-05-03 07:29:15
On Tue, May 02, 2006 at 08:03:16AM -0700, Luck, Tony wrote:
> + 	help
> + 	  The long format VHPT is an alternative hashed page table. Advantages
> + 	  of the long format VHPT are lower memory usage when there are a large
> + 	  number of processes in the system.
> 
> Is this really true?  Don't you still have all of the 3-level (or 4-level)
> tree allocated to keep the machine independent code in mm/memory.c
> happy in addition to the big block of memory that you are using on
> each cpu for the LVHPT?  Where is the saving?

Yes that does seem a bit miss-leading.  I guess the point was that
with short format you dedicate the top areas of your region to page
tables for each process, with long format it is static.

-i
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Received on Wed May 03 07:29:57 2006

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