kvm tools: Advise memory allocated for guest RAM as KSM mergable

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --git a/tools/kvm/kvm.c b/tools/kvm/kvm.c
index 23d31a31aae74b875208f9ebe3b84cbdb84b7e1c..2f5d633d384f27c192223c80d588ad87b4daafad 100644 (file)
--- a/tools/kvm/kvm.c
+++ b/tools/kvm/kvm.c
@@ -346,6 +346,8 @@ struct kvm *kvm__init(const char *kvm_dev, u64 ram_size, const char *name)
        if (kvm->ram_start == MAP_FAILED)
                die("out of memory");
 
+       madvise(kvm->ram_start, kvm->ram_size, MADV_MERGEABLE);
+
        ret = ioctl(kvm->vm_fd, KVM_CREATE_IRQCHIP);
        if (ret < 0)
                die_perror("KVM_CREATE_IRQCHIP ioctl");