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| author | Avi Kivity <avi@qumranet.com> | 2008-04-03 11:02:21 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 11:00:57 +0200 |
| commit | fcd6dbac9267c1c06a205ad8bb4bd027c0ace7f7 (patch) | |
| tree | a9645557d1d20d344f21ab464137a64896598d58 /arch/x86 | |
| parent | KVM: add vm refcounting (diff) | |
| download | linux-fcd6dbac9267c1c06a205ad8bb4bd027c0ace7f7.tar.xz linux-fcd6dbac9267c1c06a205ad8bb4bd027c0ace7f7.zip | |
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | 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 1594ee06c920..5c4c16662c68 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 |