Messages in this thread | | | Subject | Re: [PATCH 1/6] mm: tracking shared dirty pages | From | Peter Zijlstra <> | Date | Tue, 13 Jun 2006 14:15:14 +0200 |
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On Tue, 2006-06-13 at 14:03 +0200, Andi Kleen wrote: > Peter Zijlstra <a.p.zijlstra@chello.nl> writes: > > > From: Peter Zijlstra <a.p.zijlstra@chello.nl> > > > > 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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