Re: [RFC][PATCH] inactive_clean

[Christoph Lameter <clameter@sgi.com>]

On Mon, 19 Jun 2006, Peter Zijlstra wrote:

> > Hmmm.. My counter patches add NR_ANON to count the number of anonymous 
> > pages. These are all potentially dirty. If you throttle on NR_DIRTY + 
> > NR_ANON then we may have the effect without this patch.
> 
> Sure, but what do you do to reach you threshold if there are not enough
> mapped pages around to clean?

You reach the threshold and the writeout happens. So there are enough 
clean pages available.

> At that point the only thing left is to make sure some anonymous pages
> become clean, that is write them out to swap and have them sit around in
> the swap cache.

Thats fine. The threshold just insures that you can write out the 
anonymous pages.
 
> The next question is: 'which pages do I write out?', and there page
> reclaim comes in; however are you only going to write out anonymous
> pages and violate page order for file backed pages?

I would think that one would first write out dirty file backed pages.

What page order are you talking about?

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