Messages in this thread | | | Date | Tue, 13 Jun 2006 22:24:37 +1000 | From | Nick Piggin <> | Subject | Re: [PATCH 1/6] mm: tracking shared dirty pages |
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Peter Zijlstra wrote: > 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.
They can be clean.
> 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.
No they can remain in swap too.
Swap is a bit different because the memory usage patters are going to be much different. There is no reason why something similar couldn't be done for swap as well, however I don't think there is so much need for it that has been demonstrated.
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