xxx delay wait migration to get snapshot data

Author: phip1611

vmm/src/lib.rs

@@ -30,7 +30,7 @@ use std::rc::Rc;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::mpsc::{Receiver, RecvError, SendError, Sender, TrySendError};
 use std::sync::{Arc, Barrier, Mutex};
-use std::thread::JoinHandle;
+use std::thread::{JoinHandle, sleep};
 #[cfg(not(target_arch = "riscv64"))]
 use std::time::{Duration, Instant};
 use std::{io, mem, result, thread};
@@ -2349,6 +2349,9 @@ impl Vmm {
             }
         }
 
+        // XXX temporarily to fetch statistics
+        sleep(Duration::from_secs(600));
+
         // We release the locks early to enable locking them on the destination host.
         // The VM is already stopped.
         vm.release_disk_locks()