Re: [PATCH 1/6] mm: tracking shared dirty pages

[Peter Zijlstra]

On Tue, 2006-06-13 at 14:03 +0200, Andi Kleen wrote:
> Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> writes:
> 
> > From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> > 
> > People expressed the need to track dirty pages in shared mappings.
> 
> Why only shared mappings? Anonymous pages can be dirty too
> and would need to be written to swap then before making progress.

Anonymous pages are per definition dirty, as they don't have a
persistent backing store. Each eviction of an anonymous page requires IO
to swap space. On swap-in pages are removed from the swap space to make
place for other pages.

Peter

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