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KVM: MMU: Only mark_page_accessed() if the page was accessed by the guest 

If the accessed bit is not set, the guest has never accessed this page
(at least through this spte), so there's no need to mark the page
accessed.  This provides more accurate data for the eviction algortithm.

Noted by Andrea Arcangeli.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-04-03 12:02:21 +03:00
parent d39f13b0da
commit fcd6dbac92
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/mmu.c
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@ -549,7 +549,8 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
return;
sp = page_header(__pa(spte));
page = spte_to_page(*spte);
mark_page_accessed(page);
if (*spte & PT_ACCESSED_MASK)
mark_page_accessed(page);
if (is_writeble_pte(*spte))
kvm_release_page_dirty(page);
else