Re: [PATCH] (1/2) reverse mapping VM for 2.5.23 (rmap-13b)

From: Rik van Riel (riel@conectiva.com.br)
Date: Mon Jun 24 2002 - 16:39:51 EST


On Mon, 24 Jun 2002, Martin J. Bligh wrote:

> A quick rough calculation indicates that the Oracle test I was helping
> out with was consuming almost 10Gb of PTEs without rmap - 30Gb for
> overhead doesn't sound like fun to me ;-(

10 GB is already bad enough that rmap isn't so much causing
a problem but increasing an already untolerable problem.

For the large SHM segment you'd probably want to either use
large pages or shared page tables ... in each of these cases
the rmap overhead will disappear together with the page table
overhead.

Now we just need volunteers for the implementation ;)

kind regards,

Rik

-- 
Bravely reimplemented by the knights who say "NIH".

http://www.surriel.com/ http://distro.conectiva.com/

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Sun Jun 30 2002 - 22:00:08 EST