Index: linux-2.6.20.ep2/fs/eventpoll.c
===================================================================
--- linux-2.6.20.ep2.orig/fs/eventpoll.c	2007-03-04 14:40:01.000000000 -0800
+++ linux-2.6.20.ep2/fs/eventpoll.c	2007-03-04 15:12:36.000000000 -0800
@@ -258,6 +258,7 @@
 		   int maxevents, long timeout);
 static int eventpollfs_delete_dentry(struct dentry *dentry);
 static struct inode *ep_eventpoll_inode(void);
+static struct inode *ep_create_inode(void);
 static int eventpollfs_get_sb(struct file_system_type *fs_type,
 			      int flags, const char *dev_name,
 			      void *data, struct vfsmount *mnt);
@@ -279,6 +280,9 @@
 /* Virtual fs used to allocate inodes for eventpoll files */
 static struct vfsmount *eventpoll_mnt __read_mostly;
 
+/* Placeholder inode for eventpoll fds */
+static struct inode *eventpoll_inode;
+
 /* File callbacks that implement the eventpoll file behaviour */
 static const struct file_operations eventpoll_fops = {
 	.release	= ep_eventpoll_close,
@@ -771,7 +775,10 @@
 	if (!dentry)
 		goto eexit_4;
 	dentry->d_op = &eventpollfs_dentry_operations;
-	d_add(dentry, inode);
+	/* Do not publish this dentry inside the global dentry hash table */
+	dentry->d_flags &= ~DCACHE_UNHASHED;
+	d_instantiate(dentry, inode);
+
 	file->f_path.mnt = mntget(eventpoll_mnt);
 	file->f_path.dentry = dentry;
 	file->f_mapping = inode->i_mapping;
@@ -1562,6 +1569,17 @@
 
 static struct inode *ep_eventpoll_inode(void)
 {
+
+	return igrab(eventpoll_inode);
+}
+
+/*
+ * A single inode exist for all eventpoll files. On the contrary of pipes,
+ * eventpoll inodes has no per-instance data associated, so we can avoid
+ * the allocation of multiple of them.
+ */
+static struct inode *ep_create_inode(void)
+{
 	int error = -ENOMEM;
 	struct inode *inode = new_inode(eventpoll_mnt->mnt_sb);
 
@@ -1626,10 +1644,14 @@
 
 	/* Mount the above commented virtual file system */
 	eventpoll_mnt = kern_mount(&eventpoll_fs_type);
-	error = PTR_ERR(eventpoll_mnt);
 	if (IS_ERR(eventpoll_mnt))
 		goto epanic;
 
+	/* Create the single instance of inode for all eventpoll fds */
+	eventpoll_inode = ep_create_inode();
+	if (IS_ERR(eventpoll_inode))
+		goto epanic;
+
 	DNPRINTK(3, (KERN_INFO "[%p] eventpoll: successfully initialized.\n",
 			current));
 	return 0;
@@ -1642,6 +1664,7 @@
 static void __exit eventpoll_exit(void)
 {
 	/* Undo all operations done inside eventpoll_init() */
+	iput(eventpoll_inode);
 	unregister_filesystem(&eventpoll_fs_type);
 	mntput(eventpoll_mnt);
 	kmem_cache_destroy(pwq_cache);