Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 23/45] KVM: MMU: Only mark_page_accessed() if the page was accessed by the guest | Date | Thu, 17 Apr 2008 12:10:28 +0300 |
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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> --- arch/x86/kvm/mmu.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 1594ee0..5c4c166 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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 -- 1.5.5
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