Re: http://ds9a.nl/cacheinfo project - please comment & improve

[bert hubert <ahu@ds9a.nl>]

On Wed, May 30, 2001 at 04:54:12PM -0300, Marcelo Tosatti wrote:

> You're using the "address_space->dirty_pages" list to calculate the number
> of dirty pages.

I was wondering about that. In limited testing I've never seen a non-0
content of the dirty list. I ran:

dd if=/dev/zero of=test count=100000 &
while true ; do ./cinfo test; done

And saw no dirty pages. 

> So I suggest you to check for the PG_dirty (with the PageDirty macro) bit
> on pages of that list to know if they are really dirty. 

Ok - will do. I plan to release a slightly improved version shortly that
addresses this issue. Thanks!

Oh, if anybody has ideas on statistics that should be exported, please let
me know. On the agenda is a bitmap that describes which pages are actually
in the cache.

Regards,

bert

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