remove-bb-cache.diff

diff -r c98bd523e5f9 src/share/classes/sun/nio/ch/Util.java
--- a/src/share/classes/sun/nio/ch/Util.java	Fri Dec 04 15:52:11 2015 +0000
+++ b/src/share/classes/sun/nio/ch/Util.java	Sat Dec 26 11:11:23 2015 -0500
@@ -47,16 +47,6 @@
     // The number of temp buffers in our pool
     private static final int TEMP_BUF_POOL_SIZE = IOUtil.IOV_MAX;
 
-    // Per-thread cache of temporary direct buffers
-    private static ThreadLocal<BufferCache> bufferCache =
-        new ThreadLocal<BufferCache>()
-    {
-        @Override
-        protected BufferCache initialValue() {
-            return new BufferCache();
-        }
-    };
-
     /**
      * A simple cache of direct buffers.
      */
@@ -159,20 +149,7 @@
      * Returns a temporary buffer of at least the given size
      */
     public static ByteBuffer getTemporaryDirectBuffer(int size) {
-        BufferCache cache = bufferCache.get();
-        ByteBuffer buf = cache.get(size);
-        if (buf != null) {
-            return buf;
-        } else {
-            // No suitable buffer in the cache so we need to allocate a new
-            // one. To avoid the cache growing then we remove the first
-            // buffer from the cache and free it.
-            if (!cache.isEmpty()) {
-                buf = cache.removeFirst();
-                free(buf);
-            }
-            return ByteBuffer.allocateDirect(size);
-        }
+        return ByteBuffer.allocateDirect(size);
     }
 
     /**
@@ -189,11 +166,7 @@
      */
     static void offerFirstTemporaryDirectBuffer(ByteBuffer buf) {
         assert buf != null;
-        BufferCache cache = bufferCache.get();
-        if (!cache.offerFirst(buf)) {
-            // cache is full
-            free(buf);
-        }
+        free(buf);
     }
 
     /**
@@ -204,11 +177,7 @@
      */
     static void offerLastTemporaryDirectBuffer(ByteBuffer buf) {
         assert buf != null;
-        BufferCache cache = bufferCache.get();
-        if (!cache.offerLast(buf)) {
-            // cache is full
-            free(buf);
-        }
+        free(buf);
     }
 
     /**