Peter Zijlstra wrote:
On Tue, 2006-06-13 at 14:03 +0200, Andi Kleen wrote:
Peter Zijlstra <[email protected]> writes:
From: Peter Zijlstra <[email protected]>
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.
--
SUSE Labs, Novell Inc.
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