-cache. Moreover, memory pressure can cause dentries to be evicted from
-the cache at any time. Clearly, some sort of coordination is needed to
-keep the dentry cache consistent in view of concurrent changes, like
-a file being deleted on one CPU and looked up on another. A global
-lock would scale very poorly, so a more sophisticated method called
-<em>RCU-walk</em> is employed. With RCU, lookups can be performed
-without taking locks, and read operations can proceed in parallel
-with concurrent writers. </p>
+cache. Clearly, some sort of coordination is needed to keep the dentry
+cache consistent in view of concurrent changes, like a file being
+deleted on one CPU and looked up on another. A global lock would scale
+very poorly, so a more sophisticated method called <em>RCU-walk</em> is
+employed. With RCU, lookups can be performed without taking locks, and
+read operations can proceed in parallel with concurrent writers. </p>