diff -urN 2.3.42/fs/dcache.c 2.3.42-idcache/fs/dcache.c
--- 2.3.42/fs/dcache.c	Sun Jan 30 15:43:39 2000
+++ 2.3.42-idcache/fs/dcache.c	Tue Feb  8 12:26:43 2000
@@ -57,6 +57,15 @@
 	int dummy[2];
 } dentry_stat = {0, 0, 45, 0,};
 
+struct {
+	/* Enlarging too much is not a good idea since a too large cache
+	   may generate too much collisions in the hash potentially
+	   slowing down the system. */
+	int limit_percent;
+} dcache_ctl = { 2, };
+int dcache_ctl_min[] = { 0, };
+int dcache_ctl_max[] = { 100, };
+
 static inline void d_free(struct dentry *dentry)
 {
 	if (dentry->d_op && dentry->d_op->d_release)
@@ -428,6 +437,20 @@
 	return 0;
 }
 
+static inline void preshrink_dcache_memory(void)
+{
+	unsigned long size, limit;
+
+	size = (dentry_stat.nr_unused * sizeof(struct dentry)) >> PAGE_SHIFT;
+	limit = num_physpages * dcache_ctl.limit_percent / 100;
+	if (size > limit)
+	{
+		lock_kernel();
+		prune_dcache(dentry_stat.nr_unused >> 2);
+		unlock_kernel();
+	}
+}
+
 #define NAME_ALLOC_LEN(len)	((len+16) & ~15)
 
 struct dentry * d_alloc(struct dentry * parent, const struct qstr *name)
@@ -435,6 +458,7 @@
 	char * str;
 	struct dentry *dentry;
 
+	preshrink_dcache_memory();
 	dentry = kmem_cache_alloc(dentry_cache, GFP_KERNEL); 
 	if (!dentry)
 		return NULL;
diff -urN 2.3.42/fs/inode.c 2.3.42-idcache/fs/inode.c
--- 2.3.42/fs/inode.c	Sun Jan 30 15:43:39 2000
+++ 2.3.42-idcache/fs/inode.c	Tue Feb  8 12:26:43 2000
@@ -70,10 +70,19 @@
 	int dummy[5];
 } inodes_stat = {0, 0,};
 
+struct {
+	/* Enlarging too much is not a good idea since a too large cache
+	   may generate too much collisions in the hash potentially
+	   slowing down the system. */
+	int limit_percent;
+} icache_ctl = { 2, };
+int icache_ctl_min[] = { 0, };
+int icache_ctl_max[] = { 100, };
+
 static kmem_cache_t * inode_cachep;
 
 #define alloc_inode() \
-	 ((struct inode *) kmem_cache_alloc(inode_cachep, SLAB_KERNEL))
+	 (preshrink_icache_memory(), (struct inode *) kmem_cache_alloc(inode_cachep, SLAB_KERNEL))
 #define destroy_inode(inode) kmem_cache_free(inode_cachep, (inode))
 
 /*
@@ -411,6 +420,16 @@
 	kmem_cache_shrink(inode_cachep);
 
 	return 0;
+}
+
+static inline void preshrink_icache_memory(void)
+{
+	unsigned long size, limit;
+
+	size = (inodes_stat.nr_unused * sizeof(struct inode)) >> PAGE_SHIFT;
+	limit = num_physpages * icache_ctl.limit_percent / 100;
+	if (size > limit)
+		prune_icache(inodes_stat.nr_unused >> 2);
 }
 
 static inline void __iget(struct inode * inode)
diff -urN 2.3.42/include/linux/sysctl.h 2.3.42-idcache/include/linux/sysctl.h
--- 2.3.42/include/linux/sysctl.h	Sun Jan 30 15:43:39 2000
+++ 2.3.42-idcache/include/linux/sysctl.h	Tue Feb  8 12:26:43 2000
@@ -500,7 +500,9 @@
 	FS_NRSUPER=9,	/* int:current number of allocated super_blocks */
 	FS_MAXSUPER=10,	/* int:maximum number of super_blocks that can be allocated */
 	FS_OVERFLOWUID=11,	/* int: overflow UID */
-	FS_OVERFLOWGID=12	/* int: overflow GID */
+	FS_OVERFLOWGID=12,	/* int: overflow GID */
+	FS_DCACHE_CTL=13, /* dentry cache controls */
+	FS_ICACHE_CTL=14, /* inode cache controls */
 };
 
 /* CTL_DEBUG names: */
diff -urN 2.3.42/kernel/sysctl.c 2.3.42-idcache/kernel/sysctl.c
--- 2.3.42/kernel/sysctl.c	Sun Jan 30 15:43:40 2000
+++ 2.3.42-idcache/kernel/sysctl.c	Tue Feb  8 12:26:43 2000
@@ -47,6 +47,9 @@
 static int maxolduid = 65535;
 static int minolduid = 0;
 
+extern int dcache_ctl[], dcache_ctl_min[], dcache_ctl_max[];
+extern int icache_ctl[], icache_ctl_min[], icache_ctl_max[];
+
 #ifdef CONFIG_KMOD
 extern char modprobe_path[];
 #endif
@@ -306,6 +309,12 @@
 	{FS_OVERFLOWGID, "overflowgid", &fs_overflowgid, sizeof(int), 0644, NULL,
 	 &proc_dointvec_minmax, &sysctl_intvec, NULL,
 	 &minolduid, &maxolduid},
+	{FS_DCACHE_CTL, "dcache_ctl", &dcache_ctl, 1*sizeof(int), 0644, NULL,
+	 &proc_dointvec_minmax, &sysctl_intvec, NULL,
+	 &dcache_ctl_min, &dcache_ctl_max},
+	{FS_ICACHE_CTL, "icache_ctl", &icache_ctl, 1*sizeof(int), 0644, NULL,
+	 &proc_dointvec_minmax, &sysctl_intvec, NULL,
+	 &icache_ctl_min, &icache_ctl_max},
 	{0}
 };