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authorMarcelo Tosatti <marcelo@kvack.org>2008-02-23 11:44:30 -0300
committerAvi Kivity <avi@qumranet.com>2008-04-27 11:53:25 +0300
commit05da45583de9b383dc81dd695fe248431d6c9f2b (patch)
treea76d699e60aca4f775d5f67254214654235e2e17 /arch/x86/kvm/x86.c
parent2e53d63acba75795aa226febd140f67c58c6a353 (diff)
KVM: MMU: large page support
Create large pages mappings if the guest PTE's are marked as such and the underlying memory is hugetlbfs backed. If the largepage contains write-protected pages, a large pte is not used. Gives a consistent 2% improvement for data copies on ram mounted filesystem, without NPT/EPT. Anthony measures a 4% improvement on 4-way kernbench, with NPT. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
-rw-r--r--arch/x86/kvm/x86.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e8e64927bdd..0458bd51618 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -88,6 +88,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "mmu_recycled", VM_STAT(mmu_recycled) },
{ "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
{ "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
+ { "largepages", VM_STAT(lpages) },
{ NULL }
};