Messages in this thread | | | Date | Wed, 26 Jul 2006 15:04:05 +0200 | From | "Martin Schwidefsky" <> | Subject | Re: [PATCH] mm: inactive-clean list |
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On 7/26/06, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > > Hmm, I wonder how the inactive clean list helps in regard to the fast > > host reclaim > > scheme. In particular since the memory pressure that triggers the > > reclaim is in the > > host, not in the guest. So all pages might be on the active list but > > the host still > > wants to be able to discard pages. > > > > I think Rik would want to set all the already unmapped pages to volatile > state in the hypervisor. > > These pages can be dropped without loss of information on the guest > system since they are all already on a backing-store, be it regular > files or swap.
I guessed that as well. It isn't good enough. Consider a guest with a large (virtual) memory size and a host with a small physical memory size. The guest will never put any page on the inactive_clean list because it does not have memory pressure. vmscan will never run. The host wants to reclaim memory of the guest, but since the inactive_clean list is empty it will find only stable pages.
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