Re: [PATCH] Prefaulting

From: Andrew Morton
Date: Fri Mar 11 2005 - 20:24:20 EST

Christoph Lameter <clameter@xxxxxxx> wrote:
> This patch allows to aggregate multiple page faults into a single one. It
> does that by detecting that an application generates a sequence of page
> faults.
> ...
> Results that show the impact of this patch are available at

There are a lot of numbers there. Was there an executive summary?

>From a quick peek it seems that the patch makes negligible difference for a
kernel compilation when prefaulting 1-2 pages and slows the workload down
quite a lot when prefaulting up to 16 pages.

And for the uniprocessor "200 Megabyte allocation without prezeroing.
Single thread." workload it appears that the prefault patch slowed it down
by 4x.

Am I misreading the results? If not, it's a bit disappointing.
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