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diff --git a/src/ceph/src/test/common/test_lru.cc b/src/ceph/src/test/common/test_lru.cc
new file mode 100644
index 0000000..5db1831
--- /dev/null
+++ b/src/ceph/src/test/common/test_lru.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Cloudwatt <libre.licensing@cloudwatt.com>
+ *
+ * Author: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@cloudwatt.com>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <errno.h>
+#include <gtest/gtest.h>
+
+#include "include/lru.h"
+
+
+class Item : public LRUObject {
+public:
+  int id;
+  Item() : id(0) {}
+  Item(int i) : id(i) {}
+  void set(int i) {id = i;}
+};
+
+
+TEST(lru, InsertTop) {
+  LRU lru;
+  static const int n = 100;
+  Item items[n];
+
+  lru.lru_set_midpoint(.5); // 50% of elements.
+  for (int i=0; i<n; i++) {
+    items[i].set(i);
+    lru.lru_insert_top(&items[i]);
+  }
+  ASSERT_EQ(50U, lru.lru_get_top());
+  ASSERT_EQ(50U, lru.lru_get_bot());
+  ASSERT_EQ(100U, lru.lru_get_size());
+
+  ASSERT_EQ(0, (static_cast<Item*>(lru.lru_expire()))->id);
+}
+
+TEST(lru, InsertMid) {
+  LRU lru;
+  static const int n = 102;
+  Item items[n];
+
+  lru.lru_set_midpoint(.7); // 70% of elements.
+  for (int i=0; i<n; i++) {
+    items[i].set(i);
+    lru.lru_insert_mid(&items[i]);
+  }
+  ASSERT_EQ(71U, lru.lru_get_top());
+  ASSERT_EQ(31U, lru.lru_get_bot());
+  ASSERT_EQ(102U, lru.lru_get_size());
+
+  ASSERT_EQ(0, (static_cast<Item*>(lru.lru_expire()))->id);
+}
+
+TEST(lru, InsertBot) {
+  LRU lru;
+  static const int n = 100;
+  Item items[n];
+
+  lru.lru_set_midpoint(.7); // 70% of elements.
+  for (int i=0; i<n; i++) {
+    items[i].set(i);
+    lru.lru_insert_bot(&items[i]);
+  }
+  ASSERT_EQ(70U, lru.lru_get_top());
+  ASSERT_EQ(30U, lru.lru_get_bot());
+  ASSERT_EQ(100U, lru.lru_get_size());
+
+  ASSERT_EQ(99, (static_cast<Item*>(lru.lru_expire()))->id);
+}
+
+TEST(lru, Adjust) {
+  LRU lru;
+  static const int n = 100;
+  Item items[n];
+
+  lru.lru_set_midpoint(.6); // 60% of elements.
+  for (int i=0; i<n; i++) {
+    items[i].set(i);
+    lru.lru_insert_top(&items[i]);
+    if (i % 5 == 0)
+      items[i].lru_pin();
+  }
+  ASSERT_EQ(48U, lru.lru_get_top()); /* 60% of unpinned */
+  ASSERT_EQ(52U, lru.lru_get_bot());
+  ASSERT_EQ(100U, lru.lru_get_size());
+
+  ASSERT_EQ(1, (static_cast<Item*>(lru.lru_expire()))->id);
+  ASSERT_EQ(1U, lru.lru_get_pintail());
+  ASSERT_EQ(47U, lru.lru_get_top()); /* 60% of unpinned */
+  ASSERT_EQ(51U, lru.lru_get_bot());
+  ASSERT_EQ(99U, lru.lru_get_size());
+  ASSERT_EQ(2, (static_cast<Item*>(lru.lru_expire()))->id);
+  ASSERT_EQ(1U, lru.lru_get_pintail());
+  ASSERT_EQ(46U, lru.lru_get_top()); /* 60% of unpinned */
+  ASSERT_EQ(51U, lru.lru_get_bot());
+  ASSERT_EQ(98U, lru.lru_get_size());
+  ASSERT_EQ(3, (static_cast<Item*>(lru.lru_expire()))->id);
+  ASSERT_EQ(4, (static_cast<Item*>(lru.lru_expire()))->id);
+  ASSERT_EQ(6, (static_cast<Item*>(lru.lru_expire()))->id);
+  ASSERT_EQ(2U, lru.lru_get_pintail());
+  ASSERT_EQ(45U, lru.lru_get_top()); /* 60% of unpinned */
+  ASSERT_EQ(48U, lru.lru_get_bot());
+  ASSERT_EQ(95U, lru.lru_get_size());
+}
+
+TEST(lru, Pinning) {
+  LRU lru;
+
+  Item ob0(0), ob1(1);
+
+  // test before ob1 are in a LRU
+  ob1.lru_pin();
+  ASSERT_FALSE(ob1.lru_is_expireable());
+
+  ob1.lru_unpin();
+  ASSERT_TRUE(ob1.lru_is_expireable());
+
+  // test when ob1 are in a LRU
+  lru.lru_insert_top(&ob0);
+  lru.lru_insert_top(&ob1);
+
+  ob1.lru_pin();
+  ob1.lru_pin(); // Verify that, one incr.
+  ASSERT_EQ(1U, lru.lru_get_num_pinned());
+  ASSERT_FALSE(ob1.lru_is_expireable());
+
+  ob1.lru_unpin();
+  ob1.lru_unpin(); // Verify that, one decr.
+  ASSERT_EQ(0U, lru.lru_get_num_pinned());
+  ASSERT_TRUE(ob1.lru_is_expireable());
+
+  ASSERT_EQ(0, (static_cast<Item*>(lru.lru_expire()))->id);
+  ob0.lru_pin();
+  ASSERT_EQ(1, (static_cast<Item*>(lru.lru_expire()))->id);
+}
+
+
+/*
+ * Local Variables:
+ * compile-command: "cd ../.. ; make -j4 &&
+ *   make unittest_lru &&
+ *   valgrind --tool=memcheck --leak-check=full \
+ *      ./unittest_lru
+ *   "
+ * End:
+ */