diff --git a/Makefile.in b/Makefile.in
index 332efc173292..37c813cd3dbf 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -92,6 +92,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/Makefile.in b/cmd/Makefile.in
index ee3f4bef26d8..eb86e279604a 100644
--- a/cmd/Makefile.in
+++ b/cmd/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/mount_zfs/Makefile.in b/cmd/mount_zfs/Makefile.in
index 73660d21badb..44d07667e00a 100644
--- a/cmd/mount_zfs/Makefile.in
+++ b/cmd/mount_zfs/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/sas_switch_id/Makefile.in b/cmd/sas_switch_id/Makefile.in
index fb6ea65ec0bb..889da17859c3 100644
--- a/cmd/sas_switch_id/Makefile.in
+++ b/cmd/sas_switch_id/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zdb/Makefile.in b/cmd/zdb/Makefile.in
index da3119592f06..4fd55e5fa904 100644
--- a/cmd/zdb/Makefile.in
+++ b/cmd/zdb/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zfs/Makefile.in b/cmd/zfs/Makefile.in
index 55ca80892fcd..0b9b4dcc6808 100644
--- a/cmd/zfs/Makefile.in
+++ b/cmd/zfs/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zinject/Makefile.in b/cmd/zinject/Makefile.in
index 5e6f90ecbcc4..8adfaab39086 100644
--- a/cmd/zinject/Makefile.in
+++ b/cmd/zinject/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zpios/Makefile.in b/cmd/zpios/Makefile.in
index cf672f1e12d7..c0a84df6bdaa 100644
--- a/cmd/zpios/Makefile.in
+++ b/cmd/zpios/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zpool/Makefile.in b/cmd/zpool/Makefile.in
index b915006f4114..127b93690cee 100644
--- a/cmd/zpool/Makefile.in
+++ b/cmd/zpool/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zpool_id/Makefile.in b/cmd/zpool_id/Makefile.in
index aadd124133c6..29f83a3ffaa5 100644
--- a/cmd/zpool_id/Makefile.in
+++ b/cmd/zpool_id/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zpool_layout/Makefile.in b/cmd/zpool_layout/Makefile.in
index e1b16431313e..514e88f5ffd2 100644
--- a/cmd/zpool_layout/Makefile.in
+++ b/cmd/zpool_layout/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/ztest/Makefile.in b/cmd/ztest/Makefile.in
index e99cc9e85271..dc6549b6c9c7 100644
--- a/cmd/ztest/Makefile.in
+++ b/cmd/ztest/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/cmd/zvol_id/Makefile.in b/cmd/zvol_id/Makefile.in
index d6719fdb6a31..d657c8007472 100644
--- a/cmd/zvol_id/Makefile.in
+++ b/cmd/zvol_id/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/config/kernel-shrink.m4 b/config/kernel-shrink.m4
new file mode 100644
index 000000000000..ea748c9747e5
--- /dev/null
+++ b/config/kernel-shrink.m4
@@ -0,0 +1,64 @@
+dnl #
+dnl # 3.1 API change
+dnl # The super_block structure now stores a per-filesystem shrinker.
+dnl # This interface is preferable because it can be used to specifically
+dnl # target only the zfs filesystem for pruning.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SHRINK], [
+	AC_MSG_CHECKING([whether super_block has s_shrink])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/fs.h>
+	],[
+		int (*shrink)(struct shrinker *, struct shrink_control *sc)
+			__attribute__ ((unused)) = NULL;
+		struct super_block sb __attribute__ ((unused)) = {
+			.s_shrink.shrink = shrink,
+			.s_shrink.seeks = DEFAULT_SEEKS,
+			.s_shrink.batch = 0,
+		};
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SHRINK, 1, [struct super_block has s_shrink])
+
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_NR_CACHED_OBJECTS], [
+	AC_MSG_CHECKING([whether sops->nr_cached_objects() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/fs.h>
+	],[
+		int (*nr_cached_objects)(struct super_block *)
+			__attribute__ ((unused)) = NULL;
+		struct super_operations sops __attribute__ ((unused)) = {
+			.nr_cached_objects = nr_cached_objects,
+		};
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_NR_CACHED_OBJECTS, 1,
+			[sops->nr_cached_objects() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_FREE_CACHED_OBJECTS], [
+	AC_MSG_CHECKING([whether sops->free_cached_objects() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/fs.h>
+	],[
+		void (*free_cached_objects)(struct super_block *, int)
+			__attribute__ ((unused)) = NULL;
+		struct super_operations sops __attribute__ ((unused)) = {
+			.free_cached_objects = free_cached_objects,
+		};
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_FREE_CACHED_OBJECTS, 1,
+			[sops->free_cached_objects() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
diff --git a/config/kernel.m4 b/config/kernel.m4
index 63a3237ec8b7..2afe77e63b45 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -34,12 +34,15 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_XATTR_HANDLER_SET
 	ZFS_AC_KERNEL_FSYNC
 	ZFS_AC_KERNEL_EVICT_INODE
+	ZFS_AC_KERNEL_NR_CACHED_OBJECTS
+	ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
 	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
 	ZFS_AC_KERNEL_D_OBTAIN_ALIAS
 	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
 	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
 	ZFS_AC_KERNEL_MOUNT_NODEV
+	ZFS_AC_KERNEL_SHRINK
 	ZFS_AC_KERNEL_BDI
 	ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
 	ZFS_AC_KERNEL_SET_NLINK
diff --git a/configure b/configure
index d6f405bbbd09..f30b1ffcbbf7 100755
--- a/configure
+++ b/configure
@@ -14774,6 +14774,144 @@ fi
 
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether sops->nr_cached_objects() exists" >&5
+$as_echo_n "checking whether sops->nr_cached_objects() exists... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+		#include <linux/fs.h>
+
+int
+main (void)
+{
+
+		int (*nr_cached_objects)(struct super_block *)
+			__attribute__ ((unused)) = NULL;
+		struct super_operations sops __attribute__ ((unused)) = {
+			.nr_cached_objects = nr_cached_objects,
+		};
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+	rm -Rf build && mkdir -p build
+	echo "obj-m := conftest.o" >build/Makefile
+	if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_NR_CACHED_OBJECTS 1
+_ACEOF
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+	rm -Rf build
+
+
+
+
+	{ $as_echo "$as_me:$LINENO: checking whether sops->free_cached_objects() exists" >&5
+$as_echo_n "checking whether sops->free_cached_objects() exists... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+		#include <linux/fs.h>
+
+int
+main (void)
+{
+
+		void (*free_cached_objects)(struct super_block *, int)
+			__attribute__ ((unused)) = NULL;
+		struct super_operations sops __attribute__ ((unused)) = {
+			.free_cached_objects = free_cached_objects,
+		};
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+	rm -Rf build && mkdir -p build
+	echo "obj-m := conftest.o" >build/Makefile
+	if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_FREE_CACHED_OBJECTS 1
+_ACEOF
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+	rm -Rf build
+
+
+
+
 	{ $as_echo "$as_me:$LINENO: checking whether symbol insert_inode_locked is exported" >&5
 $as_echo_n "checking whether symbol insert_inode_locked is exported... " >&6; }
 	grep -q -E '[[:space:]]insert_inode_locked[[:space:]]' \
@@ -15107,6 +15245,78 @@ fi
 
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether super_block has s_shrink" >&5
+$as_echo_n "checking whether super_block has s_shrink... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+		#include <linux/fs.h>
+
+int
+main (void)
+{
+
+		int (*shrink)(struct shrinker *, struct shrink_control *sc)
+			__attribute__ ((unused)) = NULL;
+		struct super_block sb __attribute__ ((unused)) = {
+			.s_shrink.shrink = shrink,
+			.s_shrink.seeks = DEFAULT_SEEKS,
+			.s_shrink.batch = 0,
+		};
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+	rm -Rf build && mkdir -p build
+	echo "obj-m := conftest.o" >build/Makefile
+	if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_SHRINK 1
+_ACEOF
+
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+	rm -Rf build
+
+
+
+
 	{ $as_echo "$as_me:$LINENO: checking whether super_block has s_bdi" >&5
 $as_echo_n "checking whether super_block has s_bdi... " >&6; }
 
@@ -19611,6 +19821,144 @@ fi
 
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether sops->nr_cached_objects() exists" >&5
+$as_echo_n "checking whether sops->nr_cached_objects() exists... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+		#include <linux/fs.h>
+
+int
+main (void)
+{
+
+		int (*nr_cached_objects)(struct super_block *)
+			__attribute__ ((unused)) = NULL;
+		struct super_operations sops __attribute__ ((unused)) = {
+			.nr_cached_objects = nr_cached_objects,
+		};
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+	rm -Rf build && mkdir -p build
+	echo "obj-m := conftest.o" >build/Makefile
+	if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_NR_CACHED_OBJECTS 1
+_ACEOF
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+	rm -Rf build
+
+
+
+
+	{ $as_echo "$as_me:$LINENO: checking whether sops->free_cached_objects() exists" >&5
+$as_echo_n "checking whether sops->free_cached_objects() exists... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+		#include <linux/fs.h>
+
+int
+main (void)
+{
+
+		void (*free_cached_objects)(struct super_block *, int)
+			__attribute__ ((unused)) = NULL;
+		struct super_operations sops __attribute__ ((unused)) = {
+			.free_cached_objects = free_cached_objects,
+		};
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+	rm -Rf build && mkdir -p build
+	echo "obj-m := conftest.o" >build/Makefile
+	if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_FREE_CACHED_OBJECTS 1
+_ACEOF
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+	rm -Rf build
+
+
+
+
 	{ $as_echo "$as_me:$LINENO: checking whether symbol insert_inode_locked is exported" >&5
 $as_echo_n "checking whether symbol insert_inode_locked is exported... " >&6; }
 	grep -q -E '[[:space:]]insert_inode_locked[[:space:]]' \
@@ -19944,6 +20292,78 @@ fi
 
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether super_block has s_shrink" >&5
+$as_echo_n "checking whether super_block has s_shrink... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+		#include <linux/fs.h>
+
+int
+main (void)
+{
+
+		int (*shrink)(struct shrinker *, struct shrink_control *sc)
+			__attribute__ ((unused)) = NULL;
+		struct super_block sb __attribute__ ((unused)) = {
+			.s_shrink.shrink = shrink,
+			.s_shrink.seeks = DEFAULT_SEEKS,
+			.s_shrink.batch = 0,
+		};
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+	rm -Rf build && mkdir -p build
+	echo "obj-m := conftest.o" >build/Makefile
+	if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_SHRINK 1
+_ACEOF
+
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+	rm -Rf build
+
+
+
+
 	{ $as_echo "$as_me:$LINENO: checking whether super_block has s_bdi" >&5
 $as_echo_n "checking whether super_block has s_bdi... " >&6; }
 
diff --git a/dracut/90zfs/Makefile.in b/dracut/90zfs/Makefile.in
index cc79618127ca..ca1d86063154 100644
--- a/dracut/90zfs/Makefile.in
+++ b/dracut/90zfs/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/dracut/Makefile.in b/dracut/Makefile.in
index 1c6b3e609ef9..f385985d227f 100644
--- a/dracut/Makefile.in
+++ b/dracut/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/etc/Makefile.in b/etc/Makefile.in
index a2e398604dc6..481d0cdd6d8e 100644
--- a/etc/Makefile.in
+++ b/etc/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/etc/init.d/Makefile.in b/etc/init.d/Makefile.in
index 9eb8ae7b4be2..f4d0854850f2 100644
--- a/etc/init.d/Makefile.in
+++ b/etc/init.d/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/etc/zfs/Makefile.in b/etc/zfs/Makefile.in
index 6c81f5d8c96c..b421d59bc925 100644
--- a/etc/zfs/Makefile.in
+++ b/etc/zfs/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/include/Makefile.in b/include/Makefile.in
index f82fdb267b26..18e235722d46 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/include/linux/Makefile.in b/include/linux/Makefile.in
index e50b89b9b847..030437b442bc 100644
--- a/include/linux/Makefile.in
+++ b/include/linux/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/include/sys/Makefile.in b/include/sys/Makefile.in
index b17649b028ca..012ffe9f7ecd 100644
--- a/include/sys/Makefile.in
+++ b/include/sys/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/include/sys/arc.h b/include/sys/arc.h
index 8f189c62d31d..dd9b128bc1ea 100644
--- a/include/sys/arc.h
+++ b/include/sys/arc.h
@@ -34,16 +34,27 @@ extern "C" {
 #include <sys/zio.h>
 #include <sys/dmu.h>
 #include <sys/spa.h>
+#include <sys/refcount.h>
 
 typedef struct arc_buf_hdr arc_buf_hdr_t;
 typedef struct arc_buf arc_buf_t;
+typedef struct arc_prune arc_prune_t;
 typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
+typedef void arc_prune_func_t(int64_t bytes, void *private);
 typedef int arc_evict_func_t(void *private);
 
 /* generic arc_done_func_t's which you can use */
 arc_done_func_t arc_bcopy_func;
 arc_done_func_t arc_getbuf_func;
 
+/* generic arc_prune_func_t wrapper for callbacks */
+struct arc_prune {
+	arc_prune_func_t	*p_pfunc;
+	void			*p_private;
+	list_node_t		p_node;
+	refcount_t		p_refcnt;
+};
+
 struct arc_buf {
 	arc_buf_hdr_t		*b_hdr;
 	arc_buf_t		*b_next;
@@ -113,9 +124,13 @@ zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
     arc_done_func_t *ready, arc_done_func_t *done, void *private,
     int priority, int zio_flags, const zbookmark_t *zb);
 
+arc_prune_t *arc_add_prune_callback(arc_prune_func_t *func, void *private);
+void arc_remove_prune_callback(arc_prune_t *p);
+
 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
 int arc_buf_evict(arc_buf_t *buf);
 
+void arc_adjust_meta(int64_t adjustment, boolean_t may_prune);
 void arc_flush(spa_t *spa);
 void arc_tempreserve_clear(uint64_t reserve);
 int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
diff --git a/include/sys/fm/Makefile.in b/include/sys/fm/Makefile.in
index e3fd84cfdda7..932e5e7329f6 100644
--- a/include/sys/fm/Makefile.in
+++ b/include/sys/fm/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/include/sys/fm/fs/Makefile.in b/include/sys/fm/fs/Makefile.in
index 40952616b81d..bbcb1c258e50 100644
--- a/include/sys/fm/fs/Makefile.in
+++ b/include/sys/fm/fs/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/include/sys/fs/Makefile.in b/include/sys/fs/Makefile.in
index db73ab8622cf..da86a6fbc281 100644
--- a/include/sys/fs/Makefile.in
+++ b/include/sys/fs/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/include/sys/zfs_vfsops.h b/include/sys/zfs_vfsops.h
index 6d4d713cebb0..b7badeed8e58 100644
--- a/include/sys/zfs_vfsops.h
+++ b/include/sys/zfs_vfsops.h
@@ -67,7 +67,8 @@ typedef struct zfs_sb {
 	boolean_t	z_unmounted;	/* unmounted */
 	rrwlock_t	z_teardown_lock;
 	krwlock_t	z_teardown_inactive_lock;
-	list_t		z_all_znodes;	/* all vnodes in the fs */
+	list_t		z_all_znodes;	/* all znodes in the fs */
+	uint64_t	z_nr_znodes;	/* number of znodes in the fs */
 	kmutex_t	z_znodes_lock;	/* lock for z_all_znodes */
 	struct inode	*z_ctldir;	/* .zfs directory inode */
 	boolean_t	z_show_ctldir;	/* expose .zfs in the root dir */
@@ -185,6 +186,8 @@ extern int zfs_get_zplprop(objset_t *os, zfs_prop_t prop,
 extern int zfs_sb_create(const char *name, zfs_sb_t **zsbp);
 extern int zfs_sb_setup(zfs_sb_t *zsb, boolean_t mounting);
 extern void zfs_sb_free(zfs_sb_t *zsb);
+extern int zfs_sb_prune(struct super_block *sb, unsigned long nr_to_scan,
+    int *objects);
 extern int zfs_sb_teardown(zfs_sb_t *zsb, boolean_t unmounting);
 extern int zfs_check_global_label(const char *dsname, const char *hexsl);
 extern boolean_t zfs_is_readonly(zfs_sb_t *zsb);
diff --git a/include/sys/zpl.h b/include/sys/zpl.h
index 0aacce8bdf43..2195ec9a3d98 100644
--- a/include/sys/zpl.h
+++ b/include/sys/zpl.h
@@ -48,6 +48,8 @@ extern const struct file_operations zpl_file_operations;
 extern const struct file_operations zpl_dir_file_operations;
 
 /* zpl_super.c */
+extern void zpl_prune_sbs(int64_t bytes_to_scan, void *private);
+
 typedef struct zpl_mount_data {
 	const char *z_osname;	/* Dataset name */
 	void *z_data;		/* Mount options string */
diff --git a/lib/Makefile.in b/lib/Makefile.in
index 17f84a5482dd..5929cc468246 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libavl/Makefile.in b/lib/libavl/Makefile.in
index 55bb04d9f5b7..9a6ea3a7537a 100644
--- a/lib/libavl/Makefile.in
+++ b/lib/libavl/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libefi/Makefile.in b/lib/libefi/Makefile.in
index 6e4a83b3c09f..7abee8cab28f 100644
--- a/lib/libefi/Makefile.in
+++ b/lib/libefi/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libnvpair/Makefile.in b/lib/libnvpair/Makefile.in
index 60439aece27e..33d3f3b1d9fc 100644
--- a/lib/libnvpair/Makefile.in
+++ b/lib/libnvpair/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libshare/Makefile.in b/lib/libshare/Makefile.in
index 94ea82e90ac1..67d23d27967d 100644
--- a/lib/libshare/Makefile.in
+++ b/lib/libshare/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/Makefile.in b/lib/libspl/Makefile.in
index 194679a93839..db3499a6d1bb 100644
--- a/lib/libspl/Makefile.in
+++ b/lib/libspl/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/asm-generic/Makefile.in b/lib/libspl/asm-generic/Makefile.in
index a9ffb578c8e5..cae5d5678da8 100644
--- a/lib/libspl/asm-generic/Makefile.in
+++ b/lib/libspl/asm-generic/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/asm-i386/Makefile.in b/lib/libspl/asm-i386/Makefile.in
index ca6573040465..652782e66764 100644
--- a/lib/libspl/asm-i386/Makefile.in
+++ b/lib/libspl/asm-i386/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/asm-x86_64/Makefile.in b/lib/libspl/asm-x86_64/Makefile.in
index 2db49b35a68e..ad6c870dc06d 100644
--- a/lib/libspl/asm-x86_64/Makefile.in
+++ b/lib/libspl/asm-x86_64/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/Makefile.in b/lib/libspl/include/Makefile.in
index d7a8f52fcefe..419041afa43d 100644
--- a/lib/libspl/include/Makefile.in
+++ b/lib/libspl/include/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/ia32/Makefile.in b/lib/libspl/include/ia32/Makefile.in
index b60892865a9e..c0418ee60ded 100644
--- a/lib/libspl/include/ia32/Makefile.in
+++ b/lib/libspl/include/ia32/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/ia32/sys/Makefile.in b/lib/libspl/include/ia32/sys/Makefile.in
index 36629967ef24..86b08fd796c7 100644
--- a/lib/libspl/include/ia32/sys/Makefile.in
+++ b/lib/libspl/include/ia32/sys/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/rpc/Makefile.in b/lib/libspl/include/rpc/Makefile.in
index 68e3c2f12948..92529aecf774 100644
--- a/lib/libspl/include/rpc/Makefile.in
+++ b/lib/libspl/include/rpc/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/sys/Makefile.in b/lib/libspl/include/sys/Makefile.in
index 6851505dd96b..09e1ec95797c 100644
--- a/lib/libspl/include/sys/Makefile.in
+++ b/lib/libspl/include/sys/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/sys/dktp/Makefile.in b/lib/libspl/include/sys/dktp/Makefile.in
index 89c3285e1d48..84961afae1a7 100644
--- a/lib/libspl/include/sys/dktp/Makefile.in
+++ b/lib/libspl/include/sys/dktp/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/sys/sysevent/Makefile.in b/lib/libspl/include/sys/sysevent/Makefile.in
index de9db421b254..5d6a93dbe5cf 100644
--- a/lib/libspl/include/sys/sysevent/Makefile.in
+++ b/lib/libspl/include/sys/sysevent/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libspl/include/util/Makefile.in b/lib/libspl/include/util/Makefile.in
index d7cd17c15086..068a2f560037 100644
--- a/lib/libspl/include/util/Makefile.in
+++ b/lib/libspl/include/util/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libunicode/Makefile.in b/lib/libunicode/Makefile.in
index f6c8690cdecc..fbcb32b9998d 100644
--- a/lib/libunicode/Makefile.in
+++ b/lib/libunicode/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libuutil/Makefile.in b/lib/libuutil/Makefile.in
index d44bba2d6581..6507a7eadb9a 100644
--- a/lib/libuutil/Makefile.in
+++ b/lib/libuutil/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libzfs/Makefile.in b/lib/libzfs/Makefile.in
index 29642b1ac189..a975a193f29a 100644
--- a/lib/libzfs/Makefile.in
+++ b/lib/libzfs/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/lib/libzpool/Makefile.in b/lib/libzpool/Makefile.in
index 0e46c1516d7f..5e1fded91ca9 100644
--- a/lib/libzpool/Makefile.in
+++ b/lib/libzpool/Makefile.in
@@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/man/Makefile.in b/man/Makefile.in
index 84c6c1706b69..1ad3c35fdd06 100644
--- a/man/Makefile.in
+++ b/man/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/man/man8/Makefile.in b/man/man8/Makefile.in
index be187c9c03e2..86e691d2ef95 100644
--- a/man/man8/Makefile.in
+++ b/man/man8/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index f71c24844e8b..95d14a9e7511 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -104,6 +104,14 @@
  * protected from simultaneous callbacks from arc_buf_evict()
  * and arc_do_user_evicts().
  *
+ * It as also possible to register a callback which is run when the
+ * arc_meta_limit is reached and no buffers can be safely evicted.  In
+ * this case the arc user should drop a reference on some arc buffers so
+ * they can be reclaimed and the arc_meta_limit honored.  For example,
+ * when using the ZPL each dentry holds a references on a znode.  These
+ * dentries must be pruned before the arc buffer holding the znode can
+ * be safely evicted.
+ *
  * Note that the majority of the performance stats are manipulated
  * with atomic operations.
  *
@@ -120,14 +128,13 @@
 #include <sys/zio.h>
 #include <sys/zfs_context.h>
 #include <sys/arc.h>
-#include <sys/refcount.h>
 #include <sys/vdev.h>
 #include <sys/vdev_impl.h>
 #ifdef _KERNEL
 #include <sys/vmsystm.h>
 #include <vm/anon.h>
 #include <sys/fs/swapnode.h>
-#include <sys/dnlc.h>
+#include <sys/zpl.h>
 #endif
 #include <sys/callb.h>
 #include <sys/kstat.h>
@@ -141,8 +148,8 @@ extern int zfs_write_limit_shift;
 extern uint64_t zfs_write_limit_max;
 extern kmutex_t zfs_write_limit_lock;
 
-#define	ARC_REDUCE_DNLC_PERCENT	3
-uint_t arc_reduce_dnlc_percent = ARC_REDUCE_DNLC_PERCENT;
+/* number of bytes to prune from caches when at arc_meta_limit is reached */
+uint_t arc_meta_prune = 1048576;
 
 typedef enum arc_reclaim_strategy {
 	ARC_RECLAIM_AGGR,		/* Aggressive reclaim strategy */
@@ -180,7 +187,7 @@ unsigned long zfs_arc_meta_limit = 0;
 int zfs_arc_grow_retry = 0;
 int zfs_arc_shrink_shift = 0;
 int zfs_arc_p_min_shift = 0;
-int zfs_arc_reduce_dnlc_percent = 0;
+int zfs_arc_meta_prune = 0;
 
 /*
  * Note that buffers can be in one of 6 states:
@@ -288,6 +295,7 @@ typedef struct arc_stats {
 	kstat_named_t arcstat_no_grow;
 	kstat_named_t arcstat_tempreserve;
 	kstat_named_t arcstat_loaned_bytes;
+	kstat_named_t arcstat_prune;
 	kstat_named_t arcstat_meta_used;
 	kstat_named_t arcstat_meta_limit;
 	kstat_named_t arcstat_meta_max;
@@ -352,6 +360,7 @@ static arc_stats_t arc_stats = {
 	{ "arc_no_grow",		KSTAT_DATA_UINT64 },
 	{ "arc_tempreserve",		KSTAT_DATA_UINT64 },
 	{ "arc_loaned_bytes",		KSTAT_DATA_UINT64 },
+	{ "arc_prune",			KSTAT_DATA_UINT64 },
 	{ "arc_meta_used",		KSTAT_DATA_UINT64 },
 	{ "arc_meta_limit",		KSTAT_DATA_UINT64 },
 	{ "arc_meta_max",		KSTAT_DATA_UINT64 },
@@ -481,6 +490,8 @@ struct arc_buf_hdr {
 	list_node_t		b_l2node;
 };
 
+static list_t arc_prune_list;
+static kmutex_t arc_prune_mtx;
 static arc_buf_t *arc_eviction_list;
 static kmutex_t arc_eviction_mtx;
 static arc_buf_hdr_t arc_eviction_hdr;
@@ -1925,6 +1936,48 @@ arc_adjust(void)
 	}
 }
 
+/*
+ * Request that arc user drop references so that N bytes can be released
+ * from the cache.  This provides a mechanism to ensure the arc can honor
+ * the arc_meta_limit and reclaim buffers which are pinned in the cache
+ * by higher layers.  (i.e. the zpl)
+ */
+static void
+arc_do_user_prune(int64_t adjustment)
+{
+	arc_prune_func_t *func;
+	void *private;
+	arc_prune_t *cp, *np;
+
+	mutex_enter(&arc_prune_mtx);
+
+	cp = list_head(&arc_prune_list);
+	while (cp != NULL) {
+		func = cp->p_pfunc;
+		private = cp->p_private;
+		np = list_next(&arc_prune_list, cp);
+		refcount_add(&cp->p_refcnt, func);
+		mutex_exit(&arc_prune_mtx);
+
+		if (func != NULL)
+			func(adjustment, private);
+
+		mutex_enter(&arc_prune_mtx);
+
+		/* User removed prune callback concurrently with execution */
+		if (refcount_remove(&cp->p_refcnt, func) == 0) {
+			ASSERT(!list_link_active(&cp->p_node));
+			refcount_destroy(&cp->p_refcnt);
+			kmem_free(cp, sizeof (*cp));
+		}
+
+		cp = np;
+	}
+
+	ARCSTAT_BUMP(arcstat_prune);
+	mutex_exit(&arc_prune_mtx);
+}
+
 static void
 arc_do_user_evicts(void)
 {
@@ -1948,6 +2001,32 @@ arc_do_user_evicts(void)
 	mutex_exit(&arc_eviction_mtx);
 }
 
+/*
+ * Evict only meta data objects from the cache leaving the data objects.
+ * This is only used to enforce the tunable arc_meta_limit, if we are
+ * unable to evict enough buffers notify the user via the prune callback.
+ */
+void
+arc_adjust_meta(int64_t adjustment, boolean_t may_prune)
+{
+	int64_t delta;
+
+	if (adjustment > 0 && arc_mru->arcs_lsize[ARC_BUFC_METADATA] > 0) {
+		delta = MIN(arc_mru->arcs_lsize[ARC_BUFC_METADATA], adjustment);
+		arc_evict(arc_mru, 0, delta, FALSE, ARC_BUFC_METADATA);
+		adjustment -= delta;
+	}
+
+	if (adjustment > 0 && arc_mfu->arcs_lsize[ARC_BUFC_METADATA] > 0) {
+		delta = MIN(arc_mfu->arcs_lsize[ARC_BUFC_METADATA], adjustment);
+		arc_evict(arc_mfu, 0, delta, FALSE, ARC_BUFC_METADATA);
+		adjustment -= delta;
+	}
+
+	if (may_prune && (adjustment > 0) && (arc_meta_used > arc_meta_limit))
+		arc_do_user_prune(arc_meta_prune);
+}
+
 /*
  * Flush all *evictable* data from the cache for the given spa.
  * NOTE: this will not touch "active" (i.e. referenced) data.
@@ -2085,24 +2164,6 @@ arc_kmem_reap_now(arc_reclaim_strategy_t strat)
 	kmem_cache_t		*prev_data_cache = NULL;
 	extern kmem_cache_t	*zio_buf_cache[];
 	extern kmem_cache_t	*zio_data_buf_cache[];
-#ifdef _KERNEL
-	int			retry = 0;
-
-	while ((arc_meta_used >= arc_meta_limit) && (retry < 10)) {
-		/*
-		 * We are exceeding our meta-data cache limit.
-		 * Purge some DNLC entries to release holds on meta-data.
-		 */
-		dnlc_reduce_cache((void *)(uintptr_t)arc_reduce_dnlc_percent);
-		retry++;
-	}
-#if defined(__i386)
-	/*
-	 * Reclaim unused memory from all kmem caches.
-	 */
-	kmem_reap();
-#endif
-#endif
 
 	/*
 	 * An aggressive reclamation will shrink the cache size as well as
@@ -2121,6 +2182,7 @@ arc_kmem_reap_now(arc_reclaim_strategy_t strat)
 			kmem_cache_reap_now(zio_data_buf_cache[i]);
 		}
 	}
+
 	kmem_cache_reap_now(buf_cache);
 	kmem_cache_reap_now(hdr_cache);
 }
@@ -2131,6 +2193,7 @@ arc_reclaim_thread(void)
 	clock_t			growtime = 0;
 	arc_reclaim_strategy_t	last_reclaim = ARC_RECLAIM_CONS;
 	callb_cpr_t		cpr;
+	int64_t			prune;
 
 	CALLB_CPR_INIT(&cpr, &arc_reclaim_thr_lock, callb_generic_cpr, FTAG);
 
@@ -2160,9 +2223,14 @@ arc_reclaim_thread(void)
 			arc_no_grow = FALSE;
 		}
 
-		/* Keep meta data usage within limits */
-		if (arc_meta_used >= arc_meta_limit)
-			arc_kmem_reap_now(ARC_RECLAIM_CONS);
+		/*
+		 * Keep meta data usage within limits, arc_shrink() is not
+		 * used to avoid collapsing the arc_c value when only the
+		 * arc_meta_limit is being exceeded.
+		 */
+		prune = (int64_t)arc_meta_used - (int64_t)arc_meta_limit;
+		if (prune > 0)
+			arc_adjust_meta(prune, B_TRUE);
 
 		arc_adjust();
 
@@ -2399,16 +2467,27 @@ arc_get_data_buf(arc_buf_t *buf)
 		state =  (arc_mru->arcs_lsize[type] >= size &&
 		    mfu_space > arc_mfu->arcs_size) ? arc_mru : arc_mfu;
 	}
+
 	if ((buf->b_data = arc_evict(state, 0, size, TRUE, type)) == NULL) {
 		if (type == ARC_BUFC_METADATA) {
 			buf->b_data = zio_buf_alloc(size);
 			arc_space_consume(size, ARC_SPACE_DATA);
+
+			/*
+			 * If we are unable to recycle an existing meta buffer
+			 * signal the reclaim thread.  It will notify users
+			 * via the prune callback to drop references.  The
+			 * prune callback in run in the context of the reclaim
+			 * thread to avoid deadlocking on the hash_lock.
+			 */
+			cv_signal(&arc_reclaim_thr_cv);
 		} else {
 			ASSERT(type == ARC_BUFC_DATA);
 			buf->b_data = zio_data_buf_alloc(size);
 			ARCSTAT_INCR(arcstat_data_size, size);
 			atomic_add_64(&arc_size, size);
 		}
+
 		ARCSTAT_BUMP(arcstat_recycle_miss);
 	}
 	ASSERT(buf->b_data != NULL);
@@ -3021,6 +3100,37 @@ arc_read_nolock(zio_t *pio, spa_t *spa, const blkptr_t *bp,
 	return (0);
 }
 
+arc_prune_t *
+arc_add_prune_callback(arc_prune_func_t *func, void *private)
+{
+	arc_prune_t *p;
+
+	p = kmem_alloc(sizeof(*p), KM_SLEEP);
+	p->p_pfunc = func;
+	p->p_private = private;
+	list_link_init(&p->p_node);
+	refcount_create(&p->p_refcnt);
+
+	mutex_enter(&arc_prune_mtx);
+	refcount_add(&p->p_refcnt, &arc_prune_list);
+	list_insert_head(&arc_prune_list, p);
+	mutex_exit(&arc_prune_mtx);
+
+	return (p);
+}
+
+void
+arc_remove_prune_callback(arc_prune_t *p)
+{
+	mutex_enter(&arc_prune_mtx);
+	list_remove(&arc_prune_list, p);
+	if (refcount_remove(&p->p_refcnt, &arc_prune_list) == 0) {
+		refcount_destroy(&p->p_refcnt);
+		kmem_free(p, sizeof (*p));
+	}
+	mutex_exit(&arc_prune_mtx);
+}
+
 void
 arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private)
 {
@@ -3598,8 +3708,8 @@ arc_init(void)
 	if (zfs_arc_p_min_shift > 0)
 		arc_p_min_shift = zfs_arc_p_min_shift;
 
-	if (zfs_arc_reduce_dnlc_percent > 0)
-		arc_reduce_dnlc_percent = zfs_arc_reduce_dnlc_percent;
+	if (zfs_arc_meta_prune > 0)
+		arc_meta_prune = zfs_arc_meta_prune;
 
 	/* if kmem_flags are set, lets try to use less memory */
 	if (kmem_debugging())
@@ -3646,7 +3756,10 @@ arc_init(void)
 	buf_init();
 
 	arc_thread_exit = 0;
+	list_create(&arc_prune_list, sizeof (arc_prune_t),
+	    offsetof(arc_prune_t, p_node));
 	arc_eviction_list = NULL;
+	mutex_init(&arc_prune_mtx, NULL, MUTEX_DEFAULT, NULL);
 	mutex_init(&arc_eviction_mtx, NULL, MUTEX_DEFAULT, NULL);
 	bzero(&arc_eviction_hdr, sizeof (arc_buf_hdr_t));
 
@@ -3674,6 +3787,8 @@ arc_init(void)
 void
 arc_fini(void)
 {
+	arc_prune_t *p;
+
 	mutex_enter(&arc_reclaim_thr_lock);
 #ifdef _KERNEL
 	spl_unregister_shrinker(&arc_shrinker);
@@ -3693,6 +3808,17 @@ arc_fini(void)
 		arc_ksp = NULL;
 	}
 
+	mutex_enter(&arc_prune_mtx);
+	while ((p = list_head(&arc_prune_list)) != NULL) {
+		list_remove(&arc_prune_list, p);
+		refcount_remove(&p->p_refcnt, &arc_prune_list);
+		refcount_destroy(&p->p_refcnt);
+		kmem_free(p, sizeof (*p));
+	}
+	mutex_exit(&arc_prune_mtx);
+
+	list_destroy(&arc_prune_list);
+	mutex_destroy(&arc_prune_mtx);
 	mutex_destroy(&arc_eviction_mtx);
 	mutex_destroy(&arc_reclaim_thr_lock);
 	cv_destroy(&arc_reclaim_thr_cv);
@@ -4774,6 +4900,8 @@ l2arc_stop(void)
 EXPORT_SYMBOL(arc_read);
 EXPORT_SYMBOL(arc_buf_remove_ref);
 EXPORT_SYMBOL(arc_getbuf_func);
+EXPORT_SYMBOL(arc_add_prune_callback);
+EXPORT_SYMBOL(arc_remove_prune_callback);
 
 module_param(zfs_arc_min, ulong, 0444);
 MODULE_PARM_DESC(zfs_arc_min, "Min arc size");
@@ -4784,8 +4912,8 @@ MODULE_PARM_DESC(zfs_arc_max, "Max arc size");
 module_param(zfs_arc_meta_limit, ulong, 0444);
 MODULE_PARM_DESC(zfs_arc_meta_limit, "Meta limit for arc size");
 
-module_param(zfs_arc_reduce_dnlc_percent, int, 0444);
-MODULE_PARM_DESC(zfs_arc_reduce_dnlc_percent, "Meta reclaim percentage");
+module_param(zfs_arc_meta_prune, int, 0444);
+MODULE_PARM_DESC(zfs_arc_meta_prune, "Bytes of meta data to prune");
 
 module_param(zfs_arc_grow_retry, int, 0444);
 MODULE_PARM_DESC(zfs_arc_grow_retry, "Seconds before growing arc size");
diff --git a/module/zfs/zfs_vfsops.c b/module/zfs/zfs_vfsops.c
index a0726e117eae..fb319a547a93 100644
--- a/module/zfs/zfs_vfsops.c
+++ b/module/zfs/zfs_vfsops.c
@@ -986,6 +986,26 @@ zfs_root(zfs_sb_t *zsb, struct inode **ipp)
 }
 EXPORT_SYMBOL(zfs_root);
 
+#ifdef HAVE_SHRINK
+int
+zfs_sb_prune(struct super_block *sb, unsigned long nr_to_scan, int *objects)
+{
+	zfs_sb_t *zsb = sb->s_fs_info;
+	struct shrinker *shrinker = &sb->s_shrink;
+	struct shrink_control sc = {
+		.nr_to_scan = nr_to_scan,
+		.gfp_mask = GFP_KERNEL,
+	};
+
+	ZFS_ENTER(zsb);
+	*objects = (*shrinker->shrink)(shrinker, &sc);
+	ZFS_EXIT(zsb);
+
+	return (0);
+}
+EXPORT_SYMBOL(zfs_sb_prune);
+#endif /* HAVE_SHRINK */
+
 /*
  * Teardown the zfs_sb_t::z_os.
  *
@@ -1533,6 +1553,7 @@ zfs_init(void)
 	zfs_znode_init();
 	dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
 	register_filesystem(&zpl_fs_type);
+	(void) arc_add_prune_callback(zpl_prune_sbs, NULL);
 }
 
 void
diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c
index a35e3b5f2c78..709ae74f8f5c 100644
--- a/module/zfs/zfs_znode.c
+++ b/module/zfs/zfs_znode.c
@@ -269,6 +269,7 @@ zfs_inode_destroy(struct inode *ip)
 
 	mutex_enter(&zsb->z_znodes_lock);
 	list_remove(&zsb->z_all_znodes, zp);
+	zsb->z_nr_znodes--;
 	mutex_exit(&zsb->z_znodes_lock);
 
 	if (zp->z_acl_cached) {
@@ -401,6 +402,7 @@ zfs_znode_alloc(zfs_sb_t *zsb, dmu_buf_t *db, int blksz,
 
 	mutex_enter(&zsb->z_znodes_lock);
 	list_insert_tail(&zsb->z_all_znodes, zp);
+	zsb->z_nr_znodes++;
 	membar_producer();
 	mutex_exit(&zsb->z_znodes_lock);
 
diff --git a/module/zfs/zpl_super.c b/module/zfs/zpl_super.c
index 650e9c0d3791..3abb26a9e418 100644
--- a/module/zfs/zpl_super.c
+++ b/module/zfs/zpl_super.c
@@ -199,34 +199,120 @@ zpl_kill_sb(struct super_block *sb)
 	kill_anon_super(sb);
 }
 
+#ifdef HAVE_SHRINK
+/*
+ * Linux 3.1 - 3.x API
+ *
+ * The Linux 3.1 API introduced per-sb cache shrinkers to replace the
+ * global ones.  This allows us a mechanism to cleanly target a specific
+ * zfs file system when the dnode and inode caches grow too large.
+ *
+ * In addition, the 3.0 kernel added the iterate_supers_type() helper
+ * function which is used to safely walk all of the zfs file systems.
+ */
+static void
+zpl_prune_sb(struct super_block *sb, void *arg)
+{
+	int objects = 0;
+	int error;
+
+	error = -zfs_sb_prune(sb, *(unsigned long *)arg, &objects);
+	ASSERT3S(error, <=, 0);
+
+	return;
+}
+
+void
+zpl_prune_sbs(int64_t bytes_to_scan, void *private)
+{
+	unsigned long nr_to_scan = (bytes_to_scan / sizeof(znode_t));
+
+	iterate_supers_type(&zpl_fs_type, zpl_prune_sb, &nr_to_scan);
+	kmem_reap();
+}
+#else
+/*
+ * Linux 2.6.x - 3.0 API
+ *
+ * These are best effort interfaces are provided by the SPL to induce
+ * the Linux VM subsystem to reclaim a fraction of the both dnode and
+ * inode caches.  Ideally, we want to just target the zfs file systems
+ * however our only option is to reclaim from them all.
+ */
+void
+zpl_prune_sbs(int64_t bytes_to_scan, void *private)
+{
+	unsigned long nr_to_scan = (bytes_to_scan / sizeof(znode_t));
+
+        shrink_dcache_memory(nr_to_scan, GFP_KERNEL);
+        shrink_icache_memory(nr_to_scan, GFP_KERNEL);
+        kmem_reap();
+}
+#endif /* HAVE_SHRINK */
+
+#ifdef HAVE_NR_CACHED_OBJECTS
+static int
+zpl_nr_cached_objects(struct super_block *sb)
+{
+	zfs_sb_t *zsb = sb->s_fs_info;
+	int nr;
+
+	mutex_enter(&zsb->z_znodes_lock);
+	nr = zsb->z_nr_znodes;
+	mutex_exit(&zsb->z_znodes_lock);
+
+	return (nr);
+}
+#endif /* HAVE_NR_CACHED_OBJECTS */
+
+#ifdef HAVE_FREE_CACHED_OBJECTS
+/*
+ * Attempt to evict some meta data from the cache.  The ARC operates in
+ * terms of bytes while the Linux VFS uses objects.  Now because this is
+ * just a best effort eviction and the exact values aren't critical so we
+ * extrapolate from an object count to a byte size using the znode_t size.
+ */
+static void
+zpl_free_cached_objects(struct super_block *sb, int nr_to_scan)
+{
+	arc_adjust_meta(nr_to_scan * sizeof(znode_t), B_FALSE);
+}
+#endif /* HAVE_FREE_CACHED_OBJECTS */
+
 const struct super_operations zpl_super_operations = {
-	.alloc_inode	= zpl_inode_alloc,
-	.destroy_inode	= zpl_inode_destroy,
-	.dirty_inode	= NULL,
-	.write_inode	= NULL,
-	.drop_inode	= NULL,
+	.alloc_inode		= zpl_inode_alloc,
+	.destroy_inode		= zpl_inode_destroy,
+	.dirty_inode		= NULL,
+	.write_inode		= NULL,
+	.drop_inode		= NULL,
 #ifdef HAVE_EVICT_INODE
-	.evict_inode	= zpl_evict_inode,
+	.evict_inode		= zpl_evict_inode,
 #else
-	.clear_inode	= zpl_clear_inode,
-	.delete_inode	= zpl_inode_delete,
+	.clear_inode		= zpl_clear_inode,
+	.delete_inode		= zpl_inode_delete,
 #endif /* HAVE_EVICT_INODE */
-	.put_super	= zpl_put_super,
-	.write_super	= NULL,
-	.sync_fs	= zpl_sync_fs,
-	.statfs		= zpl_statfs,
-	.remount_fs	= zpl_remount_fs,
-	.show_options	= zpl_show_options,
-	.show_stats	= NULL,
+	.put_super		= zpl_put_super,
+	.write_super		= NULL,
+	.sync_fs		= zpl_sync_fs,
+	.statfs			= zpl_statfs,
+	.remount_fs		= zpl_remount_fs,
+	.show_options		= zpl_show_options,
+	.show_stats		= NULL,
+#ifdef HAVE_NR_CACHED_OBJECTS
+	.nr_cached_objects	= zpl_nr_cached_objects,
+#endif /* HAVE_NR_CACHED_OBJECTS */
+#ifdef HAVE_FREE_CACHED_OBJECTS
+	.free_cached_objects	= zpl_free_cached_objects,
+#endif /* HAVE_FREE_CACHED_OBJECTS */
 };
 
 struct file_system_type zpl_fs_type = {
-	.owner		= THIS_MODULE,
-	.name		= ZFS_DRIVER,
+	.owner			= THIS_MODULE,
+	.name			= ZFS_DRIVER,
 #ifdef HAVE_MOUNT_NODEV
-	.mount		= zpl_mount,
+	.mount			= zpl_mount,
 #else
-	.get_sb		= zpl_get_sb,
+	.get_sb			= zpl_get_sb,
 #endif /* HAVE_MOUNT_NODEV */
-	.kill_sb	= zpl_kill_sb,
+	.kill_sb		= zpl_kill_sb,
 };
diff --git a/scripts/Makefile.in b/scripts/Makefile.in
index 5115a9e0b344..4fdc85b676a9 100644
--- a/scripts/Makefile.in
+++ b/scripts/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/scripts/zpios-profile/Makefile.in b/scripts/zpios-profile/Makefile.in
index 1c59d7475d7e..339062111577 100644
--- a/scripts/zpios-profile/Makefile.in
+++ b/scripts/zpios-profile/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/scripts/zpios-test/Makefile.in b/scripts/zpios-test/Makefile.in
index fb1114530a79..1adbef8cf89f 100644
--- a/scripts/zpios-test/Makefile.in
+++ b/scripts/zpios-test/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/scripts/zpool-config/Makefile.in b/scripts/zpool-config/Makefile.in
index 2c4fcb976855..c78e79667b4f 100644
--- a/scripts/zpool-config/Makefile.in
+++ b/scripts/zpool-config/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/scripts/zpool-layout/Makefile.in b/scripts/zpool-layout/Makefile.in
index bebd47b8feae..59034e069af9 100644
--- a/scripts/zpool-layout/Makefile.in
+++ b/scripts/zpool-layout/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/udev/Makefile.in b/udev/Makefile.in
index 856d11aaf4f1..6232f65dbbd0 100644
--- a/udev/Makefile.in
+++ b/udev/Makefile.in
@@ -69,6 +69,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/udev/rules.d/Makefile.in b/udev/rules.d/Makefile.in
index 37eb4c732eac..f9a72cfb63cb 100644
--- a/udev/rules.d/Makefile.in
+++ b/udev/rules.d/Makefile.in
@@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
 	$(top_srcdir)/config/kernel-security-inode-init.m4 \
 	$(top_srcdir)/config/kernel-set-nlink.m4 \
+	$(top_srcdir)/config/kernel-shrink.m4 \
 	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
diff --git a/zfs_config.h.in b/zfs_config.h.in
index e0f746704b99..b53ca52d75a6 100644
--- a/zfs_config.h.in
+++ b/zfs_config.h.in
@@ -90,6 +90,9 @@
 /* kernel defines fmode_t */
 #undef HAVE_FMODE_T
 
+/* sops->free_cached_objects() exists */
+#undef HAVE_FREE_CACHED_OBJECTS
+
 /* fops->fsync() with range */
 #undef HAVE_FSYNC_RANGE
 
@@ -141,6 +144,9 @@
 /* mount_nodev() is available */
 #undef HAVE_MOUNT_NODEV
 
+/* sops->nr_cached_objects() exists */
+#undef HAVE_NR_CACHED_OBJECTS
+
 /* open_bdev_exclusive() is available */
 #undef HAVE_OPEN_BDEV_EXCLUSIVE
 
@@ -156,6 +162,9 @@
 /* set_nlink() is available */
 #undef HAVE_SET_NLINK
 
+/* struct super_block has s_shrink */
+#undef HAVE_SHRINK
+
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H