From f85e2cb5dbaf905e9470d3fe099b31619da431fc Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Thu, 24 Nov 2011 17:41:54 +0800 Subject: KVM: introduce a table to map slot id to index in memslots array The operation of getting dirty log is frequent when framebuffer-based displays are used(for example, Xwindow), so, we introduce a mapping table to speed up id_to_memslot() Signed-off-by: Xiao Guangrong Signed-off-by: Avi Kivity --- virt/kvm/kvm_main.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 6e8eb15dd30b..e289486edc6d 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -446,7 +446,7 @@ static void kvm_init_memslots_id(struct kvm *kvm) struct kvm_memslots *slots = kvm->memslots; for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) - slots->memslots[i].id = i; + slots->id_to_index[i] = slots->memslots[i].id = i; } static struct kvm *kvm_create_vm(void) @@ -674,8 +674,13 @@ static int cmp_memslot(const void *slot1, const void *slot2) */ static void sort_memslots(struct kvm_memslots *slots) { + int i; + sort(slots->memslots, KVM_MEM_SLOTS_NUM, sizeof(struct kvm_memory_slot), cmp_memslot, NULL); + + for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) + slots->id_to_index[slots->memslots[i].id] = i; } void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new) -- cgit v1.2.3