--- old/src/jdk.attach/aix/classes/sun/tools/attach/VirtualMachineImpl.java	2016-08-11 19:44:15.370421794 +0300
+++ new/src/jdk.attach/aix/classes/sun/tools/attach/VirtualMachineImpl.java	2016-08-11 19:44:15.261421791 +0300
@@ -76,20 +76,28 @@
                 sendQuitTo(pid);
 
                 // give the target VM time to start the attach mechanism
-                int i = 0;
-                long delay = 200;
-                int retries = (int)(attachTimeout() / delay);
+                final int delay_step = 100;
+                final long timeout = attachTimeout();
+                long time_spend = 0;
+                long delay = 0;
                 do {
+                    // Increase timeout on each attempt to reduce polling
+                    delay += delay_step;
                     try {
                         Thread.sleep(delay);
                     } catch (InterruptedException x) { }
                     path = findSocketFile(pid);
-                    i++;
-                } while (i <= retries && path == null);
+
+                    time_spend += delay;
+                    if (time_spend > timeout/2 && path == null) {
+                        // Send QUIT again to give target VM the last chance to react
+                        sendQuitTo(pid);
+                    }
+                } while (time_spend <= timeout && path == null);
                 if (path == null) {
                     throw new AttachNotSupportedException(
-                        "Unable to open socket file: target process not responding " +
-                        "or HotSpot VM not loaded");
+                        String.format("Unable to open socket file %s: " +
+                           "target process %d doesn't respond within %dms or HotSpot VM not loaded", f.getPath(), pid, time_spend));
                 }
             } finally {
                 f.delete();