kvm tools: Specify names for VM internal threads

Give threads a meaningful name. This makes debugging much easier, and
everything else much prettier.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
[ penberg@kernel.org: specify vcpu names ]
Signed-off-by: Pekka Enberg <penberg@kernel.org>

disk/core.c

@@ -63,6 +63,8 @@ static void *disk_image__thread(void *param)
 	int nr, i;
 	u64 dummy;
 
+	kvm__set_thread_name("disk-image-io");
+
 	while (read(disk->evt, &dummy, sizeof(dummy)) > 0) {
 		nr = io_getevents(disk->ctx, 1, ARRAY_SIZE(event), event, &notime);
 		for (i = 0; i < nr; i++)