nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

KVM: use heuristic for fast VCPU lookup by id

Browse source 
Usually, VCPU ids match the array index. So let's try a fast
lookup first before falling back to the slow iteration.

Suggested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2015-11-05 09:55:08 +01:00 committed by Christian Borntraeger
parent e09fefdeeb
commit c896939f7c
1 changed files with 5 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
include/linux/kvm_host.h
View file

@ -472,6 +472,11 @@ static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
struct kvm_vcpu *vcpu; struct kvm_vcpu *vcpu;
int i; int i;
if (id < 0 || id >= KVM_MAX_VCPUS)
return NULL;
vcpu = kvm_get_vcpu(kvm, id);
if (vcpu && vcpu->vcpu_id == id)
return vcpu;
kvm_for_each_vcpu(i, vcpu, kvm) kvm_for_each_vcpu(i, vcpu, kvm)
if (vcpu->vcpu_id == id) if (vcpu->vcpu_id == id)
return vcpu; return vcpu;