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| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2011-11-24 10:41:54 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-12-27 10:17:42 +0100 |
| commit | f85e2cb5dbaf905e9470d3fe099b31619da431fc (patch) | |
| tree | eb4d486094e0f2c7503a9e28a8ac76ce84d2a09e /virt/kvm/kvm_main.c | |
| parent | KVM: sort memslots by its size and use line search (diff) | |
| download | linux-f85e2cb5dbaf905e9470d3fe099b31619da431fc.tar.xz linux-f85e2cb5dbaf905e9470d3fe099b31619da431fc.zip | |
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/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 7 |
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) |