8307425: Socket input stream read burns CPU cycles with back-to-back …

…poll(0) calls

Reviewed-by: ogillespie, shade
Backport-of: 73ac710533a45bf5ba17f308aa49556b877b8bf9

src/java.base/share/classes/sun/nio/ch/NioSocketImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -177,6 +177,11 @@ private void park(FileDescriptor fd, int event, long nanos) throws IOException {
             millis = -1;
         } else {
             millis = NANOSECONDS.toMillis(nanos);
+            if (nanos > MILLISECONDS.toNanos(millis)) {
+                // Round up any excess nanos to the nearest millisecond to
+                // avoid parking for less than requested.
+                millis++;
+            }
         }
         Net.poll(fd, event, millis);
     }

src/java.base/share/classes/sun/nio/ch/SelChImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -29,6 +29,7 @@
 import java.io.FileDescriptor;
 import java.io.IOException;
 
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.concurrent.TimeUnit.NANOSECONDS;
 
 /**
@@ -88,6 +89,11 @@ default void park(int event, long nanos) throws IOException {
             millis = -1;
         } else {
             millis = NANOSECONDS.toMillis(nanos);
+            if (nanos > MILLISECONDS.toNanos(millis)) {
+                // Round up any excess nanos to the nearest millisecond to
+                // avoid parking for less than requested.
+                millis++;
+            }
         }
         Net.poll(getFD(), event, millis);
     }