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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2011-11-24 17:41:54 +0800
committerAvi Kivity <avi@redhat.com>2011-12-27 11:17:42 +0200
commitf85e2cb5dbaf905e9470d3fe099b31619da431fc (patch)
treeeb4d486094e0f2c7503a9e28a8ac76ce84d2a09e /virt
parentbf3e05bc1e2781d5d8d3ddb2d8bf2d6ec207e5cb (diff)
downloadlinux-linaro-stable-f85e2cb5dbaf905e9470d3fe099b31619da431fc.tar.gz
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 <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c7
1 files changed, 6 insertions, 1 deletions
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)