diff --git a/config/kernel-declare-event-class.m4 b/config/kernel-declare-event-class.m4
new file mode 100644
index 000000000..7867d7517
--- /dev/null
+++ b/config/kernel-declare-event-class.m4
@@ -0,0 +1,59 @@
+dnl #
+dnl # Ensure the DECLARE_EVENT_CLASS macro is available to non-GPL modules.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_DECLARE_EVENT_CLASS], [
+	tmp_flags="$EXTRA_KCFLAGS"
+	EXTRA_KCFLAGS="-I\$(src)"
+
+	AC_MSG_CHECKING([whether DECLARE_EVENT_CLASS() is available])
+	ZFS_LINUX_TRY_COMPILE_HEADER([
+		#include <linux/module.h>
+		MODULE_LICENSE(ZFS_META_LICENSE);
+
+		#define CREATE_TRACE_POINTS
+		#include "conftest.h"
+	],[
+		trace_zfs_autoconf_event_one(1UL);
+		trace_zfs_autoconf_event_two(2UL);
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_DECLARE_EVENT_CLASS, 1,
+		          [DECLARE_EVENT_CLASS() is available])
+	],[
+		AC_MSG_RESULT(no)
+	],[
+		#if !defined(_CONFTEST_H) || defined(TRACE_HEADER_MULTI_READ)
+		#define _CONFTEST_H
+
+		#undef  TRACE_SYSTEM
+		#define TRACE_SYSTEM zfs
+		#include <linux/tracepoint.h>
+
+		DECLARE_EVENT_CLASS(zfs_autoconf_event_class,
+			TP_PROTO(unsigned long i),
+			TP_ARGS(i),
+			TP_STRUCT__entry(
+				__field(unsigned long, i)
+			),
+			TP_fast_assign(
+				__entry->i = i;
+			),
+			TP_printk("i = %lu", __entry->i)
+		);
+
+		#define DEFINE_AUTOCONF_EVENT(name) \
+		DEFINE_EVENT(zfs_autoconf_event_class, name, \
+			TP_PROTO(unsigned long i), \
+			TP_ARGS(i))
+		DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_one);
+		DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_two);
+
+		#endif /* _CONFTEST_H */
+
+		#undef  TRACE_INCLUDE_PATH
+		#define TRACE_INCLUDE_PATH .
+		#define TRACE_INCLUDE_FILE conftest
+		#include <trace/define_trace.h>
+	])
+	EXTRA_KCFLAGS="$tmp_flags"
+])
diff --git a/config/kernel.m4 b/config/kernel.m4
index 9145dbd89..d8784c9db 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -6,6 +6,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_SPL
 	ZFS_AC_TEST_MODULE
 	ZFS_AC_KERNEL_CONFIG
+	ZFS_AC_KERNEL_DECLARE_EVENT_CLASS
 	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
 	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
 	ZFS_AC_KERNEL_TYPE_FMODE_T
@@ -506,9 +507,18 @@ AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
 ])
 
 dnl #
-dnl # ZFS_LINUX_CONFTEST
+dnl # ZFS_LINUX_CONFTEST_H
 dnl #
-AC_DEFUN([ZFS_LINUX_CONFTEST], [
+AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
+cat - <<_ACEOF >conftest.h
+$1
+_ACEOF
+])
+
+dnl #
+dnl # ZFS_LINUX_CONFTEST_C
+dnl #
+AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
 cat confdefs.h - <<_ACEOF >conftest.c
 $1
 _ACEOF
@@ -534,13 +544,14 @@ dnl #
 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 dnl #
 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
-	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
+	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1])])
+	m4_ifvaln([$6], [ZFS_LINUX_CONFTEST_H([$6])], [ZFS_LINUX_CONFTEST_H([])])
 	rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 	echo "obj-m := conftest.o" >build/Makefile
 	modpost_flag=''
 	test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 	AS_IF(
-		[AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
+		[AC_TRY_COMMAND(cp conftest.c conftest.h build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
 		[$4],
 		[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 	)
@@ -627,3 +638,16 @@ AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
 		fi
 	fi
 ])
+
+dnl #
+dnl # ZFS_LINUX_TRY_COMPILE_HEADER
+dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
+dnl # provided via the fifth parameter
+dnl #
+AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER],
+	[ZFS_LINUX_COMPILE_IFELSE(
+	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
+	[modules],
+	[test -s build/conftest.o],
+	[$3], [$4], [AC_LANG_SOURCE([$5])])
+])
diff --git a/include/sys/Makefile.am b/include/sys/Makefile.am
index 2c0cadd40..7ddace00d 100644
--- a/include/sys/Makefile.am
+++ b/include/sys/Makefile.am
@@ -40,11 +40,13 @@ COMMON_H = \
 	$(top_srcdir)/include/sys/rrwlock.h \
 	$(top_srcdir)/include/sys/sa.h \
 	$(top_srcdir)/include/sys/sa_impl.h \
+	$(top_srcdir)/include/sys/sdt.h \
 	$(top_srcdir)/include/sys/spa_boot.h \
 	$(top_srcdir)/include/sys/space_map.h \
 	$(top_srcdir)/include/sys/space_reftree.h \
 	$(top_srcdir)/include/sys/spa.h \
 	$(top_srcdir)/include/sys/spa_impl.h \
+	$(top_srcdir)/include/sys/trace.h \
 	$(top_srcdir)/include/sys/txg.h \
 	$(top_srcdir)/include/sys/txg_impl.h \
 	$(top_srcdir)/include/sys/u8_textprep_data.h \
diff --git a/include/sys/sdt.h b/include/sys/sdt.h
new file mode 100644
index 000000000..56efa1b39
--- /dev/null
+++ b/include/sys/sdt.h
@@ -0,0 +1,70 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_SDT_H
+#define	_SYS_SDT_H
+
+#ifndef _KERNEL
+
+#define	ZFS_PROBE(a)			((void) 0)
+#define	ZFS_PROBE1(a, c)		((void) 0)
+#define	ZFS_PROBE2(a, c, e)		((void) 0)
+#define	ZFS_PROBE3(a, c, e, g)		((void) 0)
+#define	ZFS_PROBE4(a, c, e, g, i)	((void) 0)
+#define	ZFS_SET_ERROR(err)		((void) 0)
+
+#else
+
+#if defined(HAVE_DECLARE_EVENT_CLASS)
+
+#include <sys/trace.h>
+
+/*
+ * The set-error SDT probe is extra static, in that we declare its fake
+ * function literally, rather than with the DTRACE_PROBE1() macro.  This is
+ * necessary so that SET_ERROR() can evaluate to a value, which wouldn't
+ * be possible if it required multiple statements (to declare the function
+ * and then call it).
+ *
+ * SET_ERROR() uses the comma operator so that it can be used without much
+ * additional code.  For example, "return (EINVAL);" becomes
+ * "return (SET_ERROR(EINVAL));".  Note that the argument will be evaluated
+ * twice, so it should not have side effects (e.g. something like:
+ * "return (SET_ERROR(log_error(EINVAL, info)));" would log the error twice).
+ */
+#define	SET_ERROR(err) \
+	(trace_zfs_set__error(__FILE__, __func__, __LINE__, err), err)
+
+#else
+
+#undef SET_ERROR
+#define	SET_ERROR(err) (err)
+
+#endif /* HAVE_DECLARE_EVENT_CLASS */
+
+#endif /* _KERNEL */
+
+#endif /* _SYS_SDT_H */
diff --git a/include/sys/trace.h b/include/sys/trace.h
new file mode 100644
index 000000000..c73b15ac3
--- /dev/null
+++ b/include/sys/trace.h
@@ -0,0 +1,1038 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2014 by Prakash Surya. All rights reserved.
+ */
+
+#if defined(_KERNEL) && defined(HAVE_DECLARE_EVENT_CLASS)
+
+#undef TRACE_SYSTEM
+#define	TRACE_SYSTEM zfs
+
+#if !defined(_TRACE_ZFS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define	_TRACE_ZFS_H
+
+#include <linux/tracepoint.h>
+#include <sys/types.h>
+#include <sys/list.h>
+
+/*
+ * Redefine the DTRACE_PROBE* functions to use Linux tracepoints
+ */
+#undef DTRACE_PROBE1
+#define	DTRACE_PROBE1(name, t1, arg1) \
+	trace_zfs_##name((arg1))
+
+#undef DTRACE_PROBE2
+#define	DTRACE_PROBE2(name, t1, arg1, t2, arg2) \
+	trace_zfs_##name((arg1), (arg2))
+
+#undef DTRACE_PROBE3
+#define	DTRACE_PROBE3(name, t1, arg1, t2, arg2, t3, arg3) \
+	trace_zfs_##name((arg1), (arg2), (arg3))
+
+#undef DTRACE_PROBE4
+#define	DTRACE_PROBE4(name, t1, arg1, t2, arg2, t3, arg3, t4, arg4) \
+	trace_zfs_##name((arg1), (arg2), (arg3), (arg4))
+
+typedef struct arc_buf_hdr arc_buf_hdr_t;
+typedef struct zio zio_t;
+typedef struct vdev vdev_t;
+typedef struct l2arc_write_callback l2arc_write_callback_t;
+typedef struct blkptr blkptr_t;
+typedef struct zbookmark_phys zbookmark_phys_t;
+typedef struct l2arc_dev l2arc_dev_t;
+typedef struct dmu_buf_impl dmu_buf_impl_t;
+typedef struct dmu_tx dmu_tx_t;
+typedef struct dnode dnode_t;
+typedef struct dsl_pool dsl_pool_t;
+typedef struct znode znode_t;
+typedef struct zfs_ace_hdr zfs_ace_hdr_t;
+typedef struct zilog zilog_t;
+typedef struct zrlock zrlock_t;
+
+/*
+ * Generic support for one argument tracepoints of the form:
+ *
+ * DTRACE_PROBE1(...,
+ *     arc_buf_hdr_t *, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_arc_buf_hdr_class,
+	TP_PROTO(arc_buf_hdr_t *ab),
+	TP_ARGS(ab),
+	TP_STRUCT__entry(
+	    __array(uint64_t,		hdr_dva_word, 2)
+	    __field(uint64_t,		hdr_birth)
+	    __field(uint64_t,		hdr_cksum0)
+	    __field(uint32_t,		hdr_flags)
+	    __field(uint32_t,		hdr_datacnt)
+	    __field(arc_buf_contents_t,	hdr_type)
+	    __field(uint64_t,		hdr_size)
+	    __field(uint64_t,		hdr_spa)
+	    __field(arc_state_type_t,	hdr_state_type)
+	    __field(clock_t,		hdr_access)
+	    __field(uint32_t,		hdr_mru_hits)
+	    __field(uint32_t,		hdr_mru_ghost_hits)
+	    __field(uint32_t,		hdr_mfu_hits)
+	    __field(uint32_t,		hdr_mfu_ghost_hits)
+	    __field(uint32_t,		hdr_l2_hits)
+	    __field(int64_t,		hdr_refcount)
+	),
+	TP_fast_assign(
+	    __entry->hdr_dva_word[0]	= ab->b_dva.dva_word[0];
+	    __entry->hdr_dva_word[1]	= ab->b_dva.dva_word[1];
+	    __entry->hdr_birth		= ab->b_birth;
+	    __entry->hdr_cksum0		= ab->b_cksum0;
+	    __entry->hdr_flags		= ab->b_flags;
+	    __entry->hdr_datacnt	= ab->b_datacnt;
+	    __entry->hdr_type		= ab->b_type;
+	    __entry->hdr_size		= ab->b_size;
+	    __entry->hdr_spa		= ab->b_spa;
+	    __entry->hdr_state_type	= ab->b_state->arcs_state;
+	    __entry->hdr_access		= ab->b_arc_access;
+	    __entry->hdr_mru_hits	= ab->b_mru_hits;
+	    __entry->hdr_mru_ghost_hits	= ab->b_mru_ghost_hits;
+	    __entry->hdr_mfu_hits	= ab->b_mfu_hits;
+	    __entry->hdr_mfu_ghost_hits	= ab->b_mfu_ghost_hits;
+	    __entry->hdr_l2_hits	= ab->b_l2_hits;
+	    __entry->hdr_refcount	= ab->b_refcnt.rc_count;
+	),
+	TP_printk("hdr { dva 0x%llx:0x%llx birth %llu cksum0 0x%llx "
+	    "flags 0x%x datacnt %u type %u size %llu spa %llu "
+	    "state_type %u access %lu mru_hits %u mru_ghost_hits %u "
+	    "mfu_hits %u mfu_ghost_hits %u l2_hits %u refcount %lli }",
+	    __entry->hdr_dva_word[0], __entry->hdr_dva_word[1],
+	    __entry->hdr_birth, __entry->hdr_cksum0, __entry->hdr_flags,
+	    __entry->hdr_datacnt, __entry->hdr_type, __entry->hdr_size,
+	    __entry->hdr_spa, __entry->hdr_state_type,
+	    __entry->hdr_access, __entry->hdr_mru_hits,
+	    __entry->hdr_mru_ghost_hits, __entry->hdr_mfu_hits,
+	    __entry->hdr_mfu_ghost_hits, __entry->hdr_l2_hits,
+	    __entry->hdr_refcount)
+);
+
+#define	DEFINE_ARC_BUF_HDR_EVENT(name) \
+DEFINE_EVENT(zfs_arc_buf_hdr_class, name, \
+	TP_PROTO(arc_buf_hdr_t *ab), \
+	TP_ARGS(ab))
+DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__hit);
+DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__evict);
+DEFINE_ARC_BUF_HDR_EVENT(zfs_arc__delete);
+DEFINE_ARC_BUF_HDR_EVENT(zfs_new_state__mru);
+DEFINE_ARC_BUF_HDR_EVENT(zfs_new_state__mfu);
+DEFINE_ARC_BUF_HDR_EVENT(zfs_l2arc__hit);
+DEFINE_ARC_BUF_HDR_EVENT(zfs_l2arc__miss);
+
+/*
+ * Generic support for two argument tracepoints of the form:
+ *
+ * DTRACE_PROBE2(...,
+ *     vdev_t *, ...,
+ *     zio_t *, ...);
+ */
+#define	ZIO_TP_STRUCT_ENTRY						\
+		__field(zio_type_t,		zio_type)		\
+		__field(int,			zio_cmd)		\
+		__field(zio_priority_t,		zio_priority)		\
+		__field(uint64_t,		zio_size)		\
+		__field(uint64_t,		zio_orig_size)		\
+		__field(uint64_t,		zio_offset)		\
+		__field(hrtime_t,		zio_timestamp)		\
+		__field(hrtime_t,		zio_delta)		\
+		__field(uint64_t,		zio_delay)		\
+		__field(enum zio_flag,		zio_flags)		\
+		__field(enum zio_stage,		zio_stage)		\
+		__field(enum zio_stage,		zio_pipeline)		\
+		__field(enum zio_flag,		zio_orig_flags)		\
+		__field(enum zio_stage,		zio_orig_stage)		\
+		__field(enum zio_stage,		zio_orig_pipeline)	\
+		__field(uint8_t,		zio_reexecute)		\
+		__field(uint64_t,		zio_txg)		\
+		__field(int,			zio_error)		\
+		__field(uint64_t,		zio_ena)		\
+									\
+		__field(enum zio_checksum,	zp_checksum)		\
+		__field(enum zio_compress,	zp_compress)		\
+		__field(dmu_object_type_t,	zp_type)		\
+		__field(uint8_t,		zp_level)		\
+		__field(uint8_t,		zp_copies)		\
+		__field(boolean_t,		zp_dedup)		\
+		__field(boolean_t,		zp_dedup_verify)	\
+		__field(boolean_t,		zp_nopwrite)
+
+#define	ZIO_TP_FAST_ASSIGN						    \
+		__entry->zio_type		= zio->io_type;		    \
+		__entry->zio_cmd		= zio->io_cmd;		    \
+		__entry->zio_priority		= zio->io_priority;	    \
+		__entry->zio_size		= zio->io_size;		    \
+		__entry->zio_orig_size		= zio->io_orig_size;	    \
+		__entry->zio_offset		= zio->io_offset;	    \
+		__entry->zio_timestamp		= zio->io_timestamp;	    \
+		__entry->zio_delta		= zio->io_delta;	    \
+		__entry->zio_delay		= zio->io_delay;	    \
+		__entry->zio_flags		= zio->io_flags;	    \
+		__entry->zio_stage		= zio->io_stage;	    \
+		__entry->zio_pipeline		= zio->io_pipeline;	    \
+		__entry->zio_orig_flags		= zio->io_orig_flags;	    \
+		__entry->zio_orig_stage		= zio->io_orig_stage;	    \
+		__entry->zio_orig_pipeline	= zio->io_orig_pipeline;    \
+		__entry->zio_reexecute		= zio->io_reexecute;	    \
+		__entry->zio_txg		= zio->io_txg;		    \
+		__entry->zio_error		= zio->io_error;	    \
+		__entry->zio_ena		= zio->io_ena;		    \
+									    \
+		__entry->zp_checksum		= zio->io_prop.zp_checksum; \
+		__entry->zp_compress		= zio->io_prop.zp_compress; \
+		__entry->zp_type		= zio->io_prop.zp_type;	    \
+		__entry->zp_level		= zio->io_prop.zp_level;    \
+		__entry->zp_copies		= zio->io_prop.zp_copies;   \
+		__entry->zp_dedup		= zio->io_prop.zp_dedup;    \
+		__entry->zp_nopwrite		= zio->io_prop.zp_nopwrite; \
+		__entry->zp_dedup_verify	= zio->io_prop.zp_dedup_verify;
+
+#define	ZIO_TP_PRINTK_FMT						\
+	"zio { type %u cmd %i prio %u size %llu orig_size %llu "	\
+	"offset %llu timestamp %llu delta %llu delay %llu "		\
+	"flags 0x%x stage 0x%x pipeline 0x%x orig_flags 0x%x "		\
+	"orig_stage 0x%x orig_pipeline 0x%x reexecute %u "		\
+	"txg %llu error %d ena %llu prop { checksum %u compress %u "	\
+	"type %u level %u copies %u dedup %u dedup_verify %u nopwrite %u } }"
+
+#define	ZIO_TP_PRINTK_ARGS						\
+	__entry->zio_type, __entry->zio_cmd, __entry->zio_priority,	\
+	__entry->zio_size, __entry->zio_orig_size, __entry->zio_offset,	\
+	__entry->zio_timestamp, __entry->zio_delta, __entry->zio_delay,	\
+	__entry->zio_flags, __entry->zio_stage, __entry->zio_pipeline,	\
+	__entry->zio_orig_flags, __entry->zio_orig_stage,		\
+	__entry->zio_orig_pipeline, __entry->zio_reexecute,		\
+	__entry->zio_txg, __entry->zio_error, __entry->zio_ena,		\
+	__entry->zp_checksum, __entry->zp_compress, __entry->zp_type,	\
+	__entry->zp_level, __entry->zp_copies, __entry->zp_dedup,	\
+	__entry->zp_dedup_verify, __entry->zp_nopwrite
+
+
+DECLARE_EVENT_CLASS(zfs_l2arc_rw_class,
+	TP_PROTO(vdev_t *vd, zio_t *zio),
+	TP_ARGS(vd, zio),
+	TP_STRUCT__entry(
+	    __field(uint64_t,	vdev_id)
+	    __field(uint64_t,	vdev_guid)
+	    __field(uint64_t,	vdev_state)
+	    ZIO_TP_STRUCT_ENTRY
+	),
+	TP_fast_assign(
+	    __entry->vdev_id	= vd->vdev_id;
+	    __entry->vdev_guid	= vd->vdev_guid;
+	    __entry->vdev_state	= vd->vdev_state;
+	    ZIO_TP_FAST_ASSIGN
+	),
+	TP_printk("vdev { id %llu guid %llu state %llu } "
+	    ZIO_TP_PRINTK_FMT, __entry->vdev_id, __entry->vdev_guid,
+	    __entry->vdev_state, ZIO_TP_PRINTK_ARGS)
+);
+
+#define	DEFINE_L2ARC_RW_EVENT(name) \
+DEFINE_EVENT(zfs_l2arc_rw_class, name, \
+	TP_PROTO(vdev_t *vd, zio_t *zio), \
+	TP_ARGS(vd, zio))
+DEFINE_L2ARC_RW_EVENT(zfs_l2arc__read);
+DEFINE_L2ARC_RW_EVENT(zfs_l2arc__write);
+
+/*
+ * Generic support for two argument tracepoints of the form:
+ *
+ * DTRACE_PROBE2(...,
+ *     zio_t *, ...,
+ *     l2arc_write_callback_t *, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_l2arc_iodone_class,
+	TP_PROTO(zio_t *zio, l2arc_write_callback_t *cb),
+	TP_ARGS(zio, cb),
+	TP_STRUCT__entry(ZIO_TP_STRUCT_ENTRY),
+	TP_fast_assign(ZIO_TP_FAST_ASSIGN),
+	TP_printk(ZIO_TP_PRINTK_FMT, ZIO_TP_PRINTK_ARGS)
+);
+
+#define	DEFINE_L2ARC_IODONE_EVENT(name) \
+DEFINE_EVENT(zfs_l2arc_iodone_class, name, \
+	TP_PROTO(zio_t *zio, l2arc_write_callback_t *cb), \
+	TP_ARGS(zio, cb))
+DEFINE_L2ARC_IODONE_EVENT(zfs_l2arc__iodone);
+
+/*
+ * Generic support for four argument tracepoints of the form:
+ *
+ * DTRACE_PROBE4(...,
+ *     arc_buf_hdr_t *, ...,
+ *     const blkptr_t *,
+ *     uint64_t,
+ *     const zbookmark_phys_t *);
+ */
+DECLARE_EVENT_CLASS(zfs_arc_miss_class,
+	TP_PROTO(arc_buf_hdr_t *hdr,
+	    const blkptr_t *bp, uint64_t size, const zbookmark_phys_t *zb),
+	TP_ARGS(hdr, bp, size, zb),
+	TP_STRUCT__entry(
+	    __array(uint64_t,		hdr_dva_word, 2)
+	    __field(uint64_t,		hdr_birth)
+	    __field(uint64_t,		hdr_cksum0)
+	    __field(uint32_t,		hdr_flags)
+	    __field(uint32_t,		hdr_datacnt)
+	    __field(arc_buf_contents_t,	hdr_type)
+	    __field(uint64_t,		hdr_size)
+	    __field(uint64_t,		hdr_spa)
+	    __field(arc_state_type_t,	hdr_state_type)
+	    __field(clock_t,		hdr_access)
+	    __field(uint32_t,		hdr_mru_hits)
+	    __field(uint32_t,		hdr_mru_ghost_hits)
+	    __field(uint32_t,		hdr_mfu_hits)
+	    __field(uint32_t,		hdr_mfu_ghost_hits)
+	    __field(uint32_t,		hdr_l2_hits)
+	    __field(int64_t,		hdr_refcount)
+
+	    __array(uint64_t,		bp_dva0, 2)
+	    __array(uint64_t,		bp_dva1, 2)
+	    __array(uint64_t,		bp_dva2, 2)
+	    __array(uint64_t,		bp_cksum, 4)
+
+	    __field(uint64_t,		bp_lsize)
+
+	    __field(uint64_t,		zb_objset)
+	    __field(uint64_t,		zb_object)
+	    __field(int64_t,		zb_level)
+	    __field(uint64_t,		zb_blkid)
+	),
+	TP_fast_assign(
+	    __entry->hdr_dva_word[0]	= hdr->b_dva.dva_word[0];
+	    __entry->hdr_dva_word[1]	= hdr->b_dva.dva_word[1];
+	    __entry->hdr_birth		= hdr->b_birth;
+	    __entry->hdr_cksum0		= hdr->b_cksum0;
+	    __entry->hdr_flags		= hdr->b_flags;
+	    __entry->hdr_datacnt	= hdr->b_datacnt;
+	    __entry->hdr_type		= hdr->b_type;
+	    __entry->hdr_size		= hdr->b_size;
+	    __entry->hdr_spa		= hdr->b_spa;
+	    __entry->hdr_state_type	= hdr->b_state->arcs_state;
+	    __entry->hdr_access		= hdr->b_arc_access;
+	    __entry->hdr_mru_hits	= hdr->b_mru_hits;
+	    __entry->hdr_mru_ghost_hits	= hdr->b_mru_ghost_hits;
+	    __entry->hdr_mfu_hits	= hdr->b_mfu_hits;
+	    __entry->hdr_mfu_ghost_hits	= hdr->b_mfu_ghost_hits;
+	    __entry->hdr_l2_hits	= hdr->b_l2_hits;
+	    __entry->hdr_refcount	= hdr->b_refcnt.rc_count;
+
+	    __entry->bp_dva0[0]		= bp->blk_dva[0].dva_word[0];
+	    __entry->bp_dva0[1]		= bp->blk_dva[0].dva_word[1];
+	    __entry->bp_dva1[0]		= bp->blk_dva[1].dva_word[0];
+	    __entry->bp_dva1[1]		= bp->blk_dva[1].dva_word[1];
+	    __entry->bp_dva2[0]		= bp->blk_dva[2].dva_word[0];
+	    __entry->bp_dva2[1]		= bp->blk_dva[2].dva_word[1];
+	    __entry->bp_cksum[0]	= bp->blk_cksum.zc_word[0];
+	    __entry->bp_cksum[1]	= bp->blk_cksum.zc_word[1];
+	    __entry->bp_cksum[2]	= bp->blk_cksum.zc_word[2];
+	    __entry->bp_cksum[3]	= bp->blk_cksum.zc_word[3];
+
+	    __entry->bp_lsize		= size;
+
+	    __entry->zb_objset		= zb->zb_objset;
+	    __entry->zb_object		= zb->zb_object;
+	    __entry->zb_level		= zb->zb_level;
+	    __entry->zb_blkid		= zb->zb_blkid;
+	),
+	TP_printk("hdr { dva 0x%llx:0x%llx birth %llu cksum0 0x%llx "
+	    "flags 0x%x datacnt %u type %u size %llu spa %llu state_type %u "
+	    "access %lu mru_hits %u mru_ghost_hits %u mfu_hits %u "
+	    "mfu_ghost_hits %u l2_hits %u refcount %lli } "
+	    "bp { dva0 0x%llx:0x%llx dva1 0x%llx:0x%llx dva2 "
+	    "0x%llx:0x%llx cksum 0x%llx:0x%llx:0x%llx:0x%llx "
+	    "lsize %llu } zb { objset %llu object %llu level %lli "
+	    "blkid %llu }",
+	    __entry->hdr_dva_word[0], __entry->hdr_dva_word[1],
+	    __entry->hdr_birth, __entry->hdr_cksum0, __entry->hdr_flags,
+	    __entry->hdr_datacnt, __entry->hdr_type, __entry->hdr_size,
+	    __entry->hdr_spa, __entry->hdr_state_type, __entry->hdr_access,
+	    __entry->hdr_mru_hits, __entry->hdr_mru_ghost_hits,
+	    __entry->hdr_mfu_hits, __entry->hdr_mfu_ghost_hits,
+	    __entry->hdr_l2_hits, __entry->hdr_refcount,
+	    __entry->bp_dva0[0], __entry->bp_dva0[1],
+	    __entry->bp_dva1[0], __entry->bp_dva1[1],
+	    __entry->bp_dva2[0], __entry->bp_dva2[1],
+	    __entry->bp_cksum[0], __entry->bp_cksum[1],
+	    __entry->bp_cksum[2], __entry->bp_cksum[3],
+	    __entry->bp_lsize, __entry->zb_objset, __entry->zb_object,
+	    __entry->zb_level, __entry->zb_blkid)
+);
+
+#define	DEFINE_ARC_MISS_EVENT(name) \
+DEFINE_EVENT(zfs_arc_miss_class, name, \
+	TP_PROTO(arc_buf_hdr_t *hdr, \
+	    const blkptr_t *bp, uint64_t size, const zbookmark_phys_t *zb), \
+	TP_ARGS(hdr, bp, size, zb))
+DEFINE_ARC_MISS_EVENT(zfs_arc__miss);
+
+/*
+ * Generic support for four argument tracepoints of the form:
+ *
+ * DTRACE_PROBE4(...,
+ *     l2arc_dev_t *, ...,
+ *     list_t *, ...,
+ *     uint64_t, ...,
+ *     boolean_t, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_l2arc_evict_class,
+	TP_PROTO(l2arc_dev_t *dev,
+	    list_t *buflist, uint64_t taddr, boolean_t all),
+	TP_ARGS(dev, buflist, taddr, all),
+	TP_STRUCT__entry(
+	    __field(uint64_t,		vdev_id)
+	    __field(uint64_t,		vdev_guid)
+	    __field(uint64_t,		vdev_state)
+
+	    __field(uint64_t,		l2ad_hand)
+	    __field(uint64_t,		l2ad_start)
+	    __field(uint64_t,		l2ad_end)
+	    __field(uint64_t,		l2ad_evict)
+	    __field(boolean_t,		l2ad_first)
+	    __field(boolean_t,		l2ad_writing)
+
+	    __field(uint64_t,		taddr)
+	    __field(boolean_t,		all)
+	),
+	TP_fast_assign(
+	    __entry->vdev_id		= dev->l2ad_vdev->vdev_id;
+	    __entry->vdev_guid		= dev->l2ad_vdev->vdev_guid;
+	    __entry->vdev_state		= dev->l2ad_vdev->vdev_state;
+
+	    __entry->l2ad_hand		= dev->l2ad_hand;
+	    __entry->l2ad_start		= dev->l2ad_start;
+	    __entry->l2ad_end		= dev->l2ad_end;
+	    __entry->l2ad_evict		= dev->l2ad_evict;
+	    __entry->l2ad_first		= dev->l2ad_first;
+	    __entry->l2ad_writing	= dev->l2ad_writing;
+
+	    __entry->taddr		= taddr;
+	    __entry->all		= all;
+	),
+	TP_printk("l2ad { vdev { id %llu guid %llu state %llu } "
+	    "hand %llu start %llu end %llu evict %llu "
+	    "first %d writing %d } taddr %llu all %d",
+	    __entry->vdev_id, __entry->vdev_guid, __entry->vdev_state,
+	    __entry->l2ad_hand, __entry->l2ad_start,
+	    __entry->l2ad_end, __entry->l2ad_evict,
+	    __entry->l2ad_first, __entry->l2ad_writing,
+	    __entry->taddr, __entry->all)
+);
+
+#define	DEFINE_L2ARC_EVICT_EVENT(name) \
+DEFINE_EVENT(zfs_l2arc_evict_class, name, \
+	TP_PROTO(l2arc_dev_t *dev, \
+	    list_t *buflist, uint64_t taddr, boolean_t all), \
+	TP_ARGS(dev, buflist, taddr, all))
+DEFINE_L2ARC_EVICT_EVENT(zfs_l2arc__evict);
+
+/*
+ * Generic support for three argument tracepoints of the form:
+ *
+ * DTRACE_PROBE3(...,
+ *     dmu_tx_t *, ...,
+ *     uint64_t, ...,
+ *     uint64_t, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_delay_mintime_class,
+	TP_PROTO(dmu_tx_t *tx, uint64_t dirty, uint64_t min_tx_time),
+	TP_ARGS(tx, dirty, min_tx_time),
+	TP_STRUCT__entry(
+	    __field(uint64_t,			tx_txg)
+	    __field(uint64_t,			tx_lastsnap_txg)
+	    __field(uint64_t,			tx_lasttried_txg)
+	    __field(boolean_t,			tx_anyobj)
+	    __field(boolean_t,			tx_waited)
+	    __field(hrtime_t,			tx_start)
+	    __field(boolean_t,			tx_wait_dirty)
+	    __field(int,			tx_err)
+#ifdef DEBUG_DMU_TX
+	    __field(uint64_t,			tx_space_towrite)
+	    __field(uint64_t,			tx_space_tofree)
+	    __field(uint64_t,			tx_space_tooverwrite)
+	    __field(uint64_t,			tx_space_tounref)
+	    __field(int64_t,			tx_space_written)
+	    __field(int64_t,			tx_space_freed)
+#endif
+	    __field(uint64_t,			min_tx_time)
+	    __field(uint64_t,			dirty)
+	),
+	TP_fast_assign(
+	    __entry->tx_txg			= tx->tx_txg;
+	    __entry->tx_lastsnap_txg		= tx->tx_lastsnap_txg;
+	    __entry->tx_lasttried_txg		= tx->tx_lasttried_txg;
+	    __entry->tx_anyobj			= tx->tx_anyobj;
+	    __entry->tx_waited			= tx->tx_waited;
+	    __entry->tx_start			= tx->tx_start;
+	    __entry->tx_wait_dirty		= tx->tx_wait_dirty;
+	    __entry->tx_err			= tx->tx_err;
+#ifdef DEBUG_DMU_TX
+	    __entry->tx_space_towrite		= tx->tx_space_towrite;
+	    __entry->tx_space_tofree		= tx->tx_space_tofree;
+	    __entry->tx_space_tooverwrite	= tx->tx_space_tooverwrite;
+	    __entry->tx_space_tounref		= tx->tx_space_tounref;
+	    __entry->tx_space_written		= tx->tx_space_written.rc_count;
+	    __entry->tx_space_freed		= tx->tx_space_freed.rc_count;
+#endif
+	    __entry->dirty			= dirty;
+	    __entry->min_tx_time		= min_tx_time;
+	),
+	TP_printk("tx { txg %llu lastsnap_txg %llu tx_lasttried_txg %llu "
+	    "anyobj %d waited %d start %llu wait_dirty %d err %i "
+#ifdef DEBUG_DMU_TX
+	    "space_towrite %llu space_tofree %llu space_tooverwrite %llu "
+	    "space_tounref %llu space_written %lli space_freed %lli "
+#endif
+	    "} dirty %llu min_tx_time %llu",
+	    __entry->tx_txg, __entry->tx_lastsnap_txg,
+	    __entry->tx_lasttried_txg, __entry->tx_anyobj, __entry->tx_waited,
+	    __entry->tx_start, __entry->tx_wait_dirty, __entry->tx_err,
+#ifdef DEBUG_DMU_TX
+	    __entry->tx_space_towrite, __entry->tx_space_tofree,
+	    __entry->tx_space_tooverwrite, __entry->tx_space_tounref,
+	    __entry->tx_space_written, __entry->tx_space_freed,
+#endif
+	    __entry->dirty, __entry->min_tx_time)
+);
+
+#define	DEFINE_DELAY_MINTIME_EVENT(name) \
+DEFINE_EVENT(zfs_delay_mintime_class, name, \
+	TP_PROTO(dmu_tx_t *tx, uint64_t dirty, uint64_t min_tx_time), \
+	TP_ARGS(tx, dirty, min_tx_time))
+DEFINE_DELAY_MINTIME_EVENT(zfs_delay__mintime);
+
+/*
+ * Generic support for three argument tracepoints of the form:
+ *
+ * DTRACE_PROBE3(...,
+ *     dnode_t *, ...,
+ *     int64_t, ...,
+ *     uint32_t, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_dnode_move_class,
+	TP_PROTO(dnode_t *dn, int64_t refcount, uint32_t dbufs),
+	TP_ARGS(dn, refcount, dbufs),
+	TP_STRUCT__entry(
+	    __field(uint64_t,		dn_object)
+	    __field(dmu_object_type_t,	dn_type)
+	    __field(uint16_t,		dn_bonuslen)
+	    __field(uint8_t,		dn_bonustype)
+	    __field(uint8_t,		dn_nblkptr)
+	    __field(uint8_t,		dn_checksum)
+	    __field(uint8_t,		dn_compress)
+	    __field(uint8_t,		dn_nlevels)
+	    __field(uint8_t,		dn_indblkshift)
+	    __field(uint8_t,		dn_datablkshift)
+	    __field(uint8_t,		dn_moved)
+	    __field(uint16_t,		dn_datablkszsec)
+	    __field(uint32_t,		dn_datablksz)
+	    __field(uint64_t,		dn_maxblkid)
+	    __field(int64_t,		dn_tx_holds)
+	    __field(int64_t,		dn_holds)
+	    __field(boolean_t,		dn_have_spill)
+
+	    __field(int64_t,		refcount)
+	    __field(uint32_t,		dbufs)
+	),
+	TP_fast_assign(
+	    __entry->dn_object		= dn->dn_object;
+	    __entry->dn_type		= dn->dn_type;
+	    __entry->dn_bonuslen	= dn->dn_bonuslen;
+	    __entry->dn_bonustype	= dn->dn_bonustype;
+	    __entry->dn_nblkptr		= dn->dn_nblkptr;
+	    __entry->dn_checksum	= dn->dn_checksum;
+	    __entry->dn_compress	= dn->dn_compress;
+	    __entry->dn_nlevels		= dn->dn_nlevels;
+	    __entry->dn_indblkshift	= dn->dn_indblkshift;
+	    __entry->dn_datablkshift	= dn->dn_datablkshift;
+	    __entry->dn_moved		= dn->dn_moved;
+	    __entry->dn_datablkszsec	= dn->dn_datablkszsec;
+	    __entry->dn_datablksz	= dn->dn_datablksz;
+	    __entry->dn_maxblkid	= dn->dn_maxblkid;
+	    __entry->dn_tx_holds	= dn->dn_tx_holds.rc_count;
+	    __entry->dn_holds		= dn->dn_holds.rc_count;
+	    __entry->dn_have_spill	= dn->dn_have_spill;
+
+	    __entry->refcount		= refcount;
+	    __entry->dbufs		= dbufs;
+	),
+	TP_printk("dn { object %llu type %d bonuslen %u bonustype %u "
+	    "nblkptr %u checksum %u compress %u nlevels %u indblkshift %u "
+	    "datablkshift %u moved %u datablkszsec %u datablksz %u "
+	    "maxblkid %llu tx_holds %lli holds %lli have_spill %d } "
+	    "refcount %lli dbufs %u",
+	    __entry->dn_object, __entry->dn_type, __entry->dn_bonuslen,
+	    __entry->dn_bonustype, __entry->dn_nblkptr, __entry->dn_checksum,
+	    __entry->dn_compress, __entry->dn_nlevels, __entry->dn_indblkshift,
+	    __entry->dn_datablkshift, __entry->dn_moved,
+	    __entry->dn_datablkszsec, __entry->dn_datablksz,
+	    __entry->dn_maxblkid, __entry->dn_tx_holds, __entry->dn_holds,
+	    __entry->dn_have_spill, __entry->refcount, __entry->dbufs)
+);
+
+#define	DEFINE_DNODE_MOVE_EVENT(name) \
+DEFINE_EVENT(zfs_dnode_move_class, name, \
+	TP_PROTO(dnode_t *dn, int64_t refcount, uint32_t dbufs), \
+	TP_ARGS(dn, refcount, dbufs))
+DEFINE_DNODE_MOVE_EVENT(zfs_dnode__move);
+
+/*
+ * Generic support for two argument tracepoints of the form:
+ *
+ * DTRACE_PROBE2(...,
+ *     dsl_pool_t *, ...,
+ *     uint64_t, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_txg_class,
+	TP_PROTO(dsl_pool_t *dp, uint64_t txg),
+	TP_ARGS(dp, txg),
+	TP_STRUCT__entry(
+	    __field(uint64_t, txg)
+	),
+	TP_fast_assign(
+	    __entry->txg = txg;
+	),
+	TP_printk("txg %llu", __entry->txg)
+);
+
+#define	DEFINE_TXG_EVENT(name) \
+DEFINE_EVENT(zfs_txg_class, name, \
+	TP_PROTO(dsl_pool_t *dp, uint64_t txg), \
+	TP_ARGS(dp, txg))
+DEFINE_TXG_EVENT(zfs_dsl_pool_sync__done);
+DEFINE_TXG_EVENT(zfs_txg__quiescing);
+DEFINE_TXG_EVENT(zfs_txg__opened);
+DEFINE_TXG_EVENT(zfs_txg__syncing);
+DEFINE_TXG_EVENT(zfs_txg__synced);
+DEFINE_TXG_EVENT(zfs_txg__quiesced);
+
+/*
+ * Generic support for three argument tracepoints of the form:
+ *
+ * DTRACE_PROBE3(...,
+ *     znode_t *, ...,
+ *     zfs_ace_hdr_t *, ...,
+ *     uint32_t, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_ace_class,
+	TP_PROTO(znode_t *zn, zfs_ace_hdr_t *ace, uint32_t mask_matched),
+	TP_ARGS(zn, ace, mask_matched),
+	TP_STRUCT__entry(
+	    __field(uint64_t,		z_id)
+	    __field(uint8_t,		z_unlinked)
+	    __field(uint8_t,		z_atime_dirty)
+	    __field(uint8_t,		z_zn_prefetch)
+	    __field(uint8_t,		z_moved)
+	    __field(uint_t,		z_blksz)
+	    __field(uint_t,		z_seq)
+	    __field(uint64_t,		z_mapcnt)
+	    __field(uint64_t,		z_gen)
+	    __field(uint64_t,		z_size)
+	    __array(uint64_t,		z_atime, 2)
+	    __field(uint64_t,		z_links)
+	    __field(uint64_t,		z_pflags)
+	    __field(uint64_t,		z_uid)
+	    __field(uint64_t,		z_gid)
+	    __field(uint32_t,		z_sync_cnt)
+	    __field(mode_t,		z_mode)
+	    __field(boolean_t,		z_is_sa)
+	    __field(boolean_t,		z_is_zvol)
+	    __field(boolean_t,		z_is_mapped)
+	    __field(boolean_t,		z_is_ctldir)
+	    __field(boolean_t,		z_is_stale)
+
+	    __field(unsigned long,	i_ino)
+	    __field(unsigned int,	i_nlink)
+	    __field(u64,		i_version)
+	    __field(loff_t,		i_size)
+	    __field(unsigned int,	i_blkbits)
+	    __field(unsigned short,	i_bytes)
+	    __field(umode_t,		i_mode)
+	    __field(__u32,		i_generation)
+
+	    __field(uint16_t,		z_type)
+	    __field(uint16_t,		z_flags)
+	    __field(uint32_t,		z_access_mask)
+
+	    __field(uint32_t,		mask_matched)
+	),
+	TP_fast_assign(
+	    __entry->z_id		= zn->z_id;
+	    __entry->z_unlinked		= zn->z_unlinked;
+	    __entry->z_atime_dirty	= zn->z_atime_dirty;
+	    __entry->z_zn_prefetch	= zn->z_zn_prefetch;
+	    __entry->z_moved		= zn->z_moved;
+	    __entry->z_blksz		= zn->z_blksz;
+	    __entry->z_seq		= zn->z_seq;
+	    __entry->z_mapcnt		= zn->z_mapcnt;
+	    __entry->z_gen		= zn->z_gen;
+	    __entry->z_size		= zn->z_size;
+	    __entry->z_atime[0]		= zn->z_atime[0];
+	    __entry->z_atime[1]		= zn->z_atime[1];
+	    __entry->z_links		= zn->z_links;
+	    __entry->z_pflags		= zn->z_pflags;
+	    __entry->z_uid		= zn->z_uid;
+	    __entry->z_gid		= zn->z_gid;
+	    __entry->z_sync_cnt		= zn->z_sync_cnt;
+	    __entry->z_mode		= zn->z_mode;
+	    __entry->z_is_sa		= zn->z_is_sa;
+	    __entry->z_is_zvol		= zn->z_is_zvol;
+	    __entry->z_is_mapped	= zn->z_is_mapped;
+	    __entry->z_is_ctldir	= zn->z_is_ctldir;
+	    __entry->z_is_stale		= zn->z_is_stale;
+
+	    __entry->i_ino		= zn->z_inode.i_ino;
+	    __entry->i_nlink		= zn->z_inode.i_nlink;
+	    __entry->i_version		= zn->z_inode.i_version;
+	    __entry->i_size		= zn->z_inode.i_size;
+	    __entry->i_blkbits		= zn->z_inode.i_blkbits;
+	    __entry->i_bytes		= zn->z_inode.i_bytes;
+	    __entry->i_mode		= zn->z_inode.i_mode;
+	    __entry->i_generation	= zn->z_inode.i_generation;
+
+	    __entry->z_type		= ace->z_type;
+	    __entry->z_flags		= ace->z_flags;
+	    __entry->z_access_mask	= ace->z_access_mask;
+
+	    __entry->mask_matched	= mask_matched;
+	),
+	TP_printk("zn { id %llu unlinked %u atime_dirty %u "
+	    "zn_prefetch %u moved %u blksz %u seq %u "
+	    "mapcnt %llu gen %llu size %llu atime 0x%llx:0x%llx "
+	    "links %llu pflags %llu uid %llu gid %llu "
+	    "sync_cnt %u mode 0x%x is_sa %d is_zvol %d "
+	    "is_mapped %d is_ctldir %d is_stale %d inode { "
+	    "ino %lu nlink %u version %llu size %lli blkbits %u "
+	    "bytes %u mode 0x%x generation %x } } ace { type %u "
+	    "flags %u access_mask %u } mask_matched %u",
+	    __entry->z_id, __entry->z_unlinked, __entry->z_atime_dirty,
+	    __entry->z_zn_prefetch, __entry->z_moved, __entry->z_blksz,
+	    __entry->z_seq, __entry->z_mapcnt, __entry->z_gen,
+	    __entry->z_size, __entry->z_atime[0], __entry->z_atime[1],
+	    __entry->z_links, __entry->z_pflags, __entry->z_uid,
+	    __entry->z_gid, __entry->z_sync_cnt, __entry->z_mode,
+	    __entry->z_is_sa, __entry->z_is_zvol, __entry->z_is_mapped,
+	    __entry->z_is_ctldir, __entry->z_is_stale, __entry->i_ino,
+	    __entry->i_nlink, __entry->i_version, __entry->i_size,
+	    __entry->i_blkbits, __entry->i_bytes, __entry->i_mode,
+	    __entry->i_generation, __entry->z_type, __entry->z_flags,
+	    __entry->z_access_mask, __entry->mask_matched)
+);
+
+#define	DEFINE_ACE_EVENT(name) \
+DEFINE_EVENT(zfs_ace_class, name, \
+	TP_PROTO(znode_t *zn, zfs_ace_hdr_t *ace, uint32_t mask_matched), \
+	TP_ARGS(zn, ace, mask_matched))
+DEFINE_ACE_EVENT(zfs_zfs__ace__denies);
+DEFINE_ACE_EVENT(zfs_zfs__ace__allows);
+
+/*
+ * Generic support for one argument tracepoints of the form:
+ *
+ * DTRACE_PROBE1(...,
+ *     zilog_t *, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_zil_class,
+	TP_PROTO(zilog_t *zilog),
+	TP_ARGS(zilog),
+	TP_STRUCT__entry(
+	    __field(uint64_t,	zl_lr_seq)
+	    __field(uint64_t,	zl_commit_lr_seq)
+	    __field(uint64_t,	zl_destroy_txg)
+	    __field(uint64_t,	zl_replaying_seq)
+	    __field(uint32_t,	zl_suspend)
+	    __field(uint8_t,	zl_suspending)
+	    __field(uint8_t,	zl_keep_first)
+	    __field(uint8_t,	zl_replay)
+	    __field(uint8_t,	zl_stop_sync)
+	    __field(uint8_t,	zl_writer)
+	    __field(uint8_t,	zl_logbias)
+	    __field(uint8_t,	zl_sync)
+	    __field(int,	zl_parse_error)
+	    __field(uint64_t,	zl_parse_blk_seq)
+	    __field(uint64_t,	zl_parse_lr_seq)
+	    __field(uint64_t,	zl_parse_blk_count)
+	    __field(uint64_t,	zl_parse_lr_count)
+	    __field(uint64_t,	zl_next_batch)
+	    __field(uint64_t,	zl_com_batch)
+	    __field(uint64_t,	zl_itx_list_sz)
+	    __field(uint64_t,	zl_cur_used)
+	    __field(clock_t,	zl_replay_time)
+	    __field(uint64_t,	zl_replay_blks)
+	),
+	TP_fast_assign(
+	    __entry->zl_lr_seq		= zilog->zl_lr_seq;
+	    __entry->zl_commit_lr_seq	= zilog->zl_commit_lr_seq;
+	    __entry->zl_destroy_txg	= zilog->zl_destroy_txg;
+	    __entry->zl_replaying_seq	= zilog->zl_replaying_seq;
+	    __entry->zl_suspend		= zilog->zl_suspend;
+	    __entry->zl_suspending	= zilog->zl_suspending;
+	    __entry->zl_keep_first	= zilog->zl_keep_first;
+	    __entry->zl_replay		= zilog->zl_replay;
+	    __entry->zl_stop_sync	= zilog->zl_stop_sync;
+	    __entry->zl_writer		= zilog->zl_writer;
+	    __entry->zl_logbias		= zilog->zl_logbias;
+	    __entry->zl_sync		= zilog->zl_sync;
+	    __entry->zl_parse_error	= zilog->zl_parse_error;
+	    __entry->zl_parse_blk_seq	= zilog->zl_parse_blk_seq;
+	    __entry->zl_parse_lr_seq	= zilog->zl_parse_lr_seq;
+	    __entry->zl_parse_blk_count	= zilog->zl_parse_blk_count;
+	    __entry->zl_parse_lr_count	= zilog->zl_parse_lr_count;
+	    __entry->zl_next_batch	= zilog->zl_next_batch;
+	    __entry->zl_com_batch	= zilog->zl_com_batch;
+	    __entry->zl_itx_list_sz	= zilog->zl_itx_list_sz;
+	    __entry->zl_cur_used	= zilog->zl_cur_used;
+	    __entry->zl_replay_time	= zilog->zl_replay_time;
+	    __entry->zl_replay_blks	= zilog->zl_replay_blks;
+	),
+	TP_printk("zl { lr_seq %llu commit_lr_seq %llu destroy_txg %llu "
+	    "replaying_seq %llu suspend %u suspending %u keep_first %u "
+	    "replay %u stop_sync %u writer %u logbias %u sync %u "
+	    "parse_error %u parse_blk_seq %llu parse_lr_seq %llu "
+	    "parse_blk_count %llu parse_lr_count %llu next_batch %llu "
+	    "com_batch %llu itx_list_sz %llu cur_used %llu replay_time %lu "
+	    "replay_blks %llu }",
+	    __entry->zl_lr_seq, __entry->zl_commit_lr_seq,
+	    __entry->zl_destroy_txg, __entry->zl_replaying_seq,
+	    __entry->zl_suspend, __entry->zl_suspending, __entry->zl_keep_first,
+	    __entry->zl_replay, __entry->zl_stop_sync, __entry->zl_writer,
+	    __entry->zl_logbias, __entry->zl_sync, __entry->zl_parse_error,
+	    __entry->zl_parse_blk_seq, __entry->zl_parse_lr_seq,
+	    __entry->zl_parse_blk_count, __entry->zl_parse_lr_count,
+	    __entry->zl_next_batch, __entry->zl_com_batch,
+	    __entry->zl_itx_list_sz, __entry->zl_cur_used,
+	    __entry->zl_replay_time, __entry->zl_replay_blks)
+);
+
+#define	DEFINE_ZIL_EVENT(name) \
+DEFINE_EVENT(zfs_zil_class, name, \
+	TP_PROTO(zilog_t *zilog), \
+	TP_ARGS(zilog))
+DEFINE_ZIL_EVENT(zfs_zil__cw1);
+DEFINE_ZIL_EVENT(zfs_zil__cw2);
+
+/*
+ * Generic support for two argument tracepoints of the form:
+ *
+ * DTRACE_PROBE2(...,
+ *     dmu_buf_impl_t *, ...,
+ *     zio_t *, ...);
+ */
+#define	DBUF_TP_STRUCT_ENTRY					\
+	__field(const char *,	os_spa)				\
+	__field(uint64_t,	ds_object)			\
+	__field(uint64_t,	db_object)			\
+	__field(uint64_t,	db_level)			\
+	__field(uint64_t,	db_blkid)			\
+	__field(uint64_t,	db_offset)			\
+	__field(uint64_t,	db_size)			\
+	__field(uint64_t,	db_state)			\
+	__field(int64_t,	db_holds)			\
+
+#define	DBUF_TP_FAST_ASSIGN					\
+	__entry->os_spa =					\
+	    spa_name(DB_DNODE(db)->dn_objset->os_spa);		\
+								\
+	__entry->ds_object = db->db_objset->os_dsl_dataset ?	\
+	    db->db_objset->os_dsl_dataset->ds_object : 0;	\
+								\
+	__entry->db_object = db->db.db_object;			\
+	__entry->db_level  = db->db_level;			\
+	__entry->db_blkid  = db->db_blkid;			\
+	__entry->db_offset = db->db.db_offset;			\
+	__entry->db_size   = db->db.db_size;			\
+	__entry->db_state  = db->db_state;			\
+	__entry->db_holds  = refcount_count(&db->db_holds);
+
+#define	DBUF_TP_PRINTK_FMT						\
+	"dbuf { spa \"%s\" objset %llu object %llu level %llu "		\
+	"blkid %llu offset %llu size %llu state %llu holds %lld }"
+
+#define	DBUF_TP_PRINTK_ARGS					\
+	__entry->os_spa, __entry->ds_object,			\
+	__entry->db_object, __entry->db_level,			\
+	__entry->db_blkid, __entry->db_offset,			\
+	__entry->db_size, __entry->db_state, __entry->db_holds
+
+DECLARE_EVENT_CLASS(zfs_dbuf_class,
+	TP_PROTO(dmu_buf_impl_t *db, zio_t *zio),
+	TP_ARGS(db, zio),
+	TP_STRUCT__entry(DBUF_TP_STRUCT_ENTRY),
+	TP_fast_assign(DBUF_TP_FAST_ASSIGN),
+	TP_printk(DBUF_TP_PRINTK_FMT, DBUF_TP_PRINTK_ARGS)
+);
+
+#define	DEFINE_DBUF_EVENT(name) \
+DEFINE_EVENT(zfs_dbuf_class, name, \
+	TP_PROTO(dmu_buf_impl_t *db, zio_t *zio), \
+	TP_ARGS(db, zio))
+DEFINE_DBUF_EVENT(zfs_blocked__read);
+
+/*
+ * Generic support for two argument tracepoints of the form:
+ *
+ * DTRACE_PROBE2(...,
+ *     zrlock_t *, ...,
+ *     uint32_t, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_zrlock_class,
+	TP_PROTO(zrlock_t *zrl, uint32_t n),
+	TP_ARGS(zrl, n),
+	TP_STRUCT__entry(
+	    __field(int32_t,		zr_refcount)
+#ifdef	ZFS_DEBUG
+	    __field(pid_t,		zr_owner_pid)
+	    __field(const char *,	zr_caller)
+#endif
+	    __field(uint32_t,		n)
+	),
+	TP_fast_assign(
+	    __entry->zr_refcount	= zrl->zr_refcount;
+#ifdef	ZFS_DEBUG
+	    __entry->zr_owner_pid	= zrl->zr_owner->pid;
+	    __entry->zr_caller		= zrl->zr_caller;
+#endif
+	    __entry->n			= n;
+	),
+#ifdef	ZFS_DEBUG
+	TP_printk("zrl { refcount %d owner_pid %d caller %s } n %u",
+	    __entry->zr_refcount, __entry->zr_owner_pid, __entry->zr_caller,
+	    __entry->n)
+#else
+	TP_printk("zrl { refcount %d } n %u",
+	    __entry->zr_refcount, __entry->n)
+#endif
+);
+
+#define	DEFINE_ZRLOCK_EVENT(name) \
+DEFINE_EVENT(zfs_zrlock_class, name, \
+	TP_PROTO(zrlock_t *zrl, uint32_t n), \
+	TP_ARGS(zrl, n))
+DEFINE_ZRLOCK_EVENT(zfs_zrlock__reentry);
+
+/*
+ * Generic support for four argument tracepoints of the form:
+ *
+ * DTRACE_PROBE4(...,
+ *     const char *, ...,
+ *     const char *, ...,
+ *     int, ...,
+ *     uintptr_t, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_set_error_class,
+	TP_PROTO(const char *file, const char *function, int line,
+	    uintptr_t error),
+	TP_ARGS(file, function, line, error),
+	TP_STRUCT__entry(
+	    __field(const char *,	file)
+	    __field(const char *,	function)
+	    __field(int,		line)
+	    __field(uintptr_t,		error)
+	),
+	TP_fast_assign(
+	    __entry->file = strchr(file, '/') ? strrchr(file, '/') + 1 : file;
+	    __entry->function		= function;
+	    __entry->line		= line;
+	    __entry->error		= error;
+	),
+	TP_printk("%s:%d:%s(): error 0x%lx", __entry->file, __entry->line,
+	    __entry->function, __entry->error)
+);
+
+#define	DEFINE_SET_ERROR_EVENT(name) \
+DEFINE_EVENT(zfs_set_error_class, name, \
+	TP_PROTO(const char *file, const char *function, int line, \
+	    uintptr_t error), \
+	TP_ARGS(file, function, line, error))
+DEFINE_SET_ERROR_EVENT(zfs_set__error);
+
+/*
+ * Generic support for four argument tracepoints of the form:
+ *
+ * DTRACE_PROBE4(...,
+ *     const char *, ...,
+ *     const char *, ...,
+ *     int, ...,
+ *     const char *, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_dprintf_class,
+	TP_PROTO(const char *file, const char *function, int line,
+	    const char *msg),
+	TP_ARGS(file, function, line, msg),
+	TP_STRUCT__entry(
+	    __field(const char *,	file)
+	    __field(const char *,	function)
+	    __field(int,		line)
+	    __string(msg, msg)
+	),
+	TP_fast_assign(
+	    __entry->file		= file;
+	    __entry->function		= function;
+	    __entry->line		= line;
+	    __assign_str(msg, msg);
+	),
+	TP_printk("%s:%d:%s(): %s", __entry->file, __entry->line,
+	    __entry->function, __get_str(msg))
+);
+
+#define	DEFINE_DPRINTF_EVENT(name) \
+DEFINE_EVENT(zfs_dprintf_class, name, \
+	TP_PROTO(const char *file, const char *function, int line, \
+	    const char *msg), \
+	TP_ARGS(file, function, line, msg))
+DEFINE_DPRINTF_EVENT(zfs_zfs__dprintf);
+
+/*
+ * Generic support for one argument tracepoints of the form:
+ *
+ * DTRACE_PROBE1(...,
+ *     const char *, ...);
+ */
+DECLARE_EVENT_CLASS(zfs_dbgmsg_class,
+	TP_PROTO(const char *msg),
+	TP_ARGS(msg),
+	TP_STRUCT__entry(
+	    __string(msg, msg)
+	),
+	TP_fast_assign(
+	    __assign_str(msg, msg);
+	),
+	TP_printk("%s", __get_str(msg))
+);
+
+#define	DEFINE_DBGMSG_EVENT(name) \
+DEFINE_EVENT(zfs_dbgmsg_class, name, \
+	TP_PROTO(const char *msg), \
+	TP_ARGS(msg))
+DEFINE_DBGMSG_EVENT(zfs_zfs__dbgmsg);
+
+#endif /* _TRACE_ZFS_H */
+
+#undef TRACE_INCLUDE_PATH
+#define	TRACE_INCLUDE_PATH sys
+#define	TRACE_INCLUDE_FILE trace
+#include <trace/define_trace.h>
+
+#endif /* _KERNEL && HAVE_DECLARE_EVENT_CLASS */
diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
index ee8221d53..d4c6fb810 100644
--- a/include/sys/zfs_context.h
+++ b/include/sys/zfs_context.h
@@ -66,6 +66,7 @@
 #include <sys/sunddi.h>
 #include <sys/ctype.h>
 #include <sys/disp.h>
+#include <sys/trace.h>
 #include <linux/dcache_compat.h>
 #include <linux/utsname_compat.h>
 
@@ -140,15 +141,12 @@
 #define	CE_PANIC	3	/* panic		*/
 #define	CE_IGNORE	4	/* print nothing	*/
 
-extern int aok;
-
 /*
  * ZFS debugging
  */
 
 extern void dprintf_setup(int *argc, char **argv);
-extern void __dprintf(const char *file, const char *func,
-    int line, const char *fmt, ...);
+
 extern void cmn_err(int, const char *, ...);
 extern void vcmn_err(int, const char *, va_list);
 extern void panic(const char *, ...);
@@ -156,7 +154,8 @@ extern void vpanic(const char *, va_list);
 
 #define	fm_panic	panic
 
-#ifdef __sun
+extern int aok;
+
 /*
  * DTrace SDT probes have different signatures in userland than they do in
  * kernel.  If they're being used in kernel code, re-define them out of
@@ -202,9 +201,6 @@ extern void vpanic(const char *, va_list);
  * "return (SET_ERROR(log_error(EINVAL, info)));" would log the error twice).
  */
 #define	SET_ERROR(err) (ZFS_SET_ERROR(err), err)
-#else
-#define	SET_ERROR(err) (err)
-#endif
 
 /*
  * Threads.  TS_STACK_MIN is dictated by the minimum allowed pthread stack
diff --git a/include/sys/zfs_debug.h b/include/sys/zfs_debug.h
index 35ffa0187..1a7062408 100644
--- a/include/sys/zfs_debug.h
+++ b/include/sys/zfs_debug.h
@@ -38,14 +38,6 @@ extern "C" {
 #define	FALSE 0
 #endif
 
-/*
- * ZFS debugging - Always enabled for user space builds.
- */
-
-#if !defined(ZFS_DEBUG) && !defined(_KERNEL)
-#define	ZFS_DEBUG
-#endif
-
 extern int zfs_flags;
 extern int zfs_recover;
 extern int zfs_free_leak_on_eio;
@@ -59,29 +51,15 @@ extern int zfs_free_leak_on_eio;
 #define	ZFS_DEBUG_ZIO_FREE		(1<<6)
 #define	ZFS_DEBUG_HISTOGRAM_VERIFY	(1<<7)
 
-/*
- * Always log zfs debug messages to the spl debug subsystem as SS_USER1.
- * When the SPL is configured with debugging enabled these messages will
- * appear in the internal spl debug log, otherwise they are a no-op.
- */
-#if defined(_KERNEL)
-
-#include <spl-debug.h>
-#define	dprintf(...)                                                   \
-	if (zfs_flags & ZFS_DEBUG_DPRINTF)                             \
-		__SDEBUG(NULL, SS_USER1, SD_DPRINTF, __VA_ARGS__)
-
-/*
- * When zfs is running is user space the debugging is always enabled.
- * The messages will be printed using the __dprintf() function and
- * filtered based on the zfs_flags variable.
- */
-#else
-#define	dprintf(...)                                                   \
-	if (zfs_flags & ZFS_DEBUG_DPRINTF)                             \
+#if defined(HAVE_DECLARE_EVENT_CLASS) || !defined(_KERNEL)
+extern void __dprintf(const char *file, const char *func,
+    int line, const char *fmt, ...);
+#define	dprintf(...) \
+	if (zfs_flags & ZFS_DEBUG_DPRINTF) \
 		__dprintf(__FILE__, __func__, __LINE__, __VA_ARGS__)
-
-#endif /* _KERNEL */
+#else
+#define	dprintf(...) ((void)0)
+#endif /* HAVE_DECLARE_EVENT_CLASS || !_KERNEL */
 
 extern void zfs_panic_recover(const char *fmt, ...);
 
@@ -93,12 +71,8 @@ typedef struct zfs_dbgmsg {
 
 extern void zfs_dbgmsg_init(void);
 extern void zfs_dbgmsg_fini(void);
-#if defined(_KERNEL) && defined(__linux__)
-#define	zfs_dbgmsg(...) dprintf(__VA_ARGS__)
-#else
 extern void zfs_dbgmsg(const char *fmt, ...);
 extern void zfs_dbgmsg_print(const char *tag);
-#endif
 
 #ifndef _KERNEL
 extern int dprintf_find_string(const char *string);
diff --git a/lib/libspl/include/sys/Makefile.am b/lib/libspl/include/sys/Makefile.am
index d86cc6a56..8545f54ea 100644
--- a/lib/libspl/include/sys/Makefile.am
+++ b/lib/libspl/include/sys/Makefile.am
@@ -33,7 +33,6 @@ libspl_HEADERS = \
 	$(top_srcdir)/lib/libspl/include/sys/param.h \
 	$(top_srcdir)/lib/libspl/include/sys/priv.h \
 	$(top_srcdir)/lib/libspl/include/sys/processor.h \
-	$(top_srcdir)/lib/libspl/include/sys/sdt.h \
 	$(top_srcdir)/lib/libspl/include/sys/stack.h \
 	$(top_srcdir)/lib/libspl/include/sys/stat.h \
 	$(top_srcdir)/lib/libspl/include/sys/stropts.h \
diff --git a/lib/libzpool/Makefile.am b/lib/libzpool/Makefile.am
index f4838da75..85bc0510a 100644
--- a/lib/libzpool/Makefile.am
+++ b/lib/libzpool/Makefile.am
@@ -70,6 +70,7 @@ libzpool_la_SOURCES = \
 	$(top_srcdir)/module/zfs/space_map.c \
 	$(top_srcdir)/module/zfs/space_reftree.c \
 	$(top_srcdir)/module/zfs/txg.c \
+	$(top_srcdir)/module/zfs/trace.c \
 	$(top_srcdir)/module/zfs/uberblock.c \
 	$(top_srcdir)/module/zfs/unique.c \
 	$(top_srcdir)/module/zfs/vdev.c \
diff --git a/module/zfs/Makefile.in b/module/zfs/Makefile.in
index 48e7e97e9..954841f33 100644
--- a/module/zfs/Makefile.in
+++ b/module/zfs/Makefile.in
@@ -52,6 +52,7 @@ $(MODULE)-objs += @top_srcdir@/module/zfs/spa_stats.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/space_map.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/space_reftree.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/txg.o
+$(MODULE)-objs += @top_srcdir@/module/zfs/trace.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/uberblock.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/unique.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/vdev.o
diff --git a/module/zfs/spa_misc.c b/module/zfs/spa_misc.c
index bb740e569..2d16d7e06 100644
--- a/module/zfs/spa_misc.c
+++ b/module/zfs/spa_misc.c
@@ -238,6 +238,53 @@ static avl_tree_t spa_l2cache_avl;
 kmem_cache_t *spa_buffer_pool;
 int spa_mode_global;
 
+#ifdef ZFS_DEBUG
+/* Everything except dprintf and spa is on by default in debug builds */
+int zfs_flags = ~(ZFS_DEBUG_DPRINTF | ZFS_DEBUG_SPA);
+#else
+int zfs_flags = 0;
+#endif
+
+/*
+ * zfs_recover can be set to nonzero to attempt to recover from
+ * otherwise-fatal errors, typically caused by on-disk corruption.  When
+ * set, calls to zfs_panic_recover() will turn into warning messages.
+ * This should only be used as a last resort, as it typically results
+ * in leaked space, or worse.
+ */
+int zfs_recover = B_FALSE;
+
+/*
+ * If destroy encounters an EIO while reading metadata (e.g. indirect
+ * blocks), space referenced by the missing metadata can not be freed.
+ * Normally this causes the background destroy to become "stalled", as
+ * it is unable to make forward progress.  While in this stalled state,
+ * all remaining space to free from the error-encountering filesystem is
+ * "temporarily leaked".  Set this flag to cause it to ignore the EIO,
+ * permanently leak the space from indirect blocks that can not be read,
+ * and continue to free everything else that it can.
+ *
+ * The default, "stalling" behavior is useful if the storage partially
+ * fails (i.e. some but not all i/os fail), and then later recovers.  In
+ * this case, we will be able to continue pool operations while it is
+ * partially failed, and when it recovers, we can continue to free the
+ * space, with no leaks.  However, note that this case is actually
+ * fairly rare.
+ *
+ * Typically pools either (a) fail completely (but perhaps temporarily,
+ * e.g. a top-level vdev going offline), or (b) have localized,
+ * permanent errors (e.g. disk returns the wrong data due to bit flip or
+ * firmware bug).  In case (a), this setting does not matter because the
+ * pool will be suspended and the sync thread will not be able to make
+ * forward progress regardless.  In case (b), because the error is
+ * permanent, the best we can do is leak the minimum amount of space,
+ * which is what setting this flag will do.  Therefore, it is reasonable
+ * for this flag to normally be set, but we chose the more conservative
+ * approach of not setting it, so that there is no possibility of
+ * leaking space in the "partial temporary" failure case.
+ */
+int zfs_free_leak_on_eio = B_FALSE;
+
 /*
  * Expiration time in milliseconds. This value has two meanings. First it is
  * used to determine when the spa_deadman() logic should fire. By default the
@@ -1319,6 +1366,16 @@ spa_freeze(spa_t *spa)
 		txg_wait_synced(spa_get_dsl(spa), freeze_txg);
 }
 
+void
+zfs_panic_recover(const char *fmt, ...)
+{
+	va_list adx;
+
+	va_start(adx, fmt);
+	vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
+	va_end(adx);
+}
+
 /*
  * This is a stripped-down version of strtoull, suitable only for converting
  * lowercase hexadecimal numbers that don't overflow.
@@ -1923,6 +1980,16 @@ EXPORT_SYMBOL(spa_mode);
 
 EXPORT_SYMBOL(spa_namespace_lock);
 
+module_param(zfs_flags, int, 0644);
+MODULE_PARM_DESC(zfs_flags, "Set additional debugging flags");
+
+module_param(zfs_recover, int, 0644);
+MODULE_PARM_DESC(zfs_recover, "Set to attempt to recover from fatal errors");
+
+module_param(zfs_free_leak_on_eio, int, 0644);
+MODULE_PARM_DESC(zfs_free_leak_on_eio,
+	"Set to ignore IO errors during free and permanently leak the space");
+
 module_param(zfs_deadman_synctime_ms, ulong, 0644);
 MODULE_PARM_DESC(zfs_deadman_synctime_ms, "Expiration time in milliseconds");
 
diff --git a/lib/libspl/include/sys/sdt.h b/module/zfs/trace.c
similarity index 53%
rename from lib/libspl/include/sys/sdt.h
rename to module/zfs/trace.c
index f68f79040..54ca2b2b4 100644
--- a/lib/libspl/include/sys/sdt.h
+++ b/module/zfs/trace.c
@@ -2,9 +2,8 @@
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
- * Common Development and Distribution License, Version 1.0 only
- * (the "License").  You may not use this file except in compliance
- * with the License.
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
@@ -20,17 +19,21 @@
  * CDDL HEADER END
  */
 /*
- * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
+ * Each Linux tracepoints subsystem must define CREATE_TRACE_POINTS in one
+ * (and only one) C file, so this dummy file exists for that purpose.
  */
 
-#ifndef _LIBSPL_SYS_SDT_H
-#define	_LIBSPL_SYS_SDT_H
+#include <sys/arc_impl.h>
+#include <sys/vdev_impl.h>
+#include <sys/zio.h>
+#include <sys/dbuf.h>
+#include <sys/dmu_objset.h>
+#include <sys/dsl_dataset.h>
+#include <sys/dmu_tx.h>
+#include <sys/dnode.h>
+#include <sys/zfs_znode.h>
+#include <sys/zil_impl.h>
+#include <sys/zrlock.h>
 
-#define	DTRACE_PROBE(a)					((void) 0)
-#define	DTRACE_PROBE1(a, b, c)				((void) 0)
-#define	DTRACE_PROBE2(a, b, c, d, e)			((void) 0)
-#define	DTRACE_PROBE3(a, b, c, d, e, f, g)		((void) 0)
-#define	DTRACE_PROBE4(a, b, c, d, e, f, g, h, i)	((void) 0)
-
-#endif
+#define	CREATE_TRACE_POINTS
+#include <sys/trace.h>
diff --git a/module/zfs/zfs_debug.c b/module/zfs/zfs_debug.c
index e7f266b5f..e1675c818 100644
--- a/module/zfs/zfs_debug.c
+++ b/module/zfs/zfs_debug.c
@@ -25,99 +25,22 @@
 
 #include <sys/zfs_context.h>
 
-#if !defined(_KERNEL) || !defined(__linux__)
 list_t zfs_dbgmsgs;
 int zfs_dbgmsg_size;
 kmutex_t zfs_dbgmsgs_lock;
 int zfs_dbgmsg_maxsize = 4<<20; /* 4MB */
-#endif
 
-/*
- * Enable various debugging features.
- */
-int zfs_flags = 0;
-
-/*
- * zfs_recover can be set to nonzero to attempt to recover from
- * otherwise-fatal errors, typically caused by on-disk corruption.  When
- * set, calls to zfs_panic_recover() will turn into warning messages.
- * This should only be used as a last resort, as it typically results
- * in leaked space, or worse.
- */
-int zfs_recover = B_FALSE;
-
-/*
- * If destroy encounters an EIO while reading metadata (e.g. indirect
- * blocks), space referenced by the missing metadata can not be freed.
- * Normally this causes the background destroy to become "stalled", as
- * it is unable to make forward progress.  While in this stalled state,
- * all remaining space to free from the error-encountering filesystem is
- * "temporarily leaked".  Set this flag to cause it to ignore the EIO,
- * permanently leak the space from indirect blocks that can not be read,
- * and continue to free everything else that it can.
- *
- * The default, "stalling" behavior is useful if the storage partially
- * fails (i.e. some but not all i/os fail), and then later recovers.  In
- * this case, we will be able to continue pool operations while it is
- * partially failed, and when it recovers, we can continue to free the
- * space, with no leaks.  However, note that this case is actually
- * fairly rare.
- *
- * Typically pools either (a) fail completely (but perhaps temporarily,
- * e.g. a top-level vdev going offline), or (b) have localized,
- * permanent errors (e.g. disk returns the wrong data due to bit flip or
- * firmware bug).  In case (a), this setting does not matter because the
- * pool will be suspended and the sync thread will not be able to make
- * forward progress regardless.  In case (b), because the error is
- * permanent, the best we can do is leak the minimum amount of space,
- * which is what setting this flag will do.  Therefore, it is reasonable
- * for this flag to normally be set, but we chose the more conservative
- * approach of not setting it, so that there is no possibility of
- * leaking space in the "partial temporary" failure case.
- */
-int zfs_free_leak_on_eio = B_FALSE;
-
-
-void
-zfs_panic_recover(const char *fmt, ...)
-{
-	va_list adx;
-
-	va_start(adx, fmt);
-	vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx);
-	va_end(adx);
-}
-
-/*
- * Debug logging is enabled by default for production kernel builds.
- * The overhead for this is negligible and the logs can be valuable when
- * debugging.  For non-production user space builds all debugging except
- * logging is enabled since performance is no longer a concern.
- */
 void
 zfs_dbgmsg_init(void)
 {
-#if !defined(_KERNEL) || !defined(__linux__)
 	list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
 	    offsetof(zfs_dbgmsg_t, zdm_node));
 	mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
-#endif
-
-	if (zfs_flags == 0) {
-#if defined(_KERNEL)
-		zfs_flags = ZFS_DEBUG_DPRINTF;
-		spl_debug_set_mask(spl_debug_get_mask() | SD_DPRINTF);
-		spl_debug_set_subsys(spl_debug_get_subsys() | SS_USER1);
-#else
-		zfs_flags = ~ZFS_DEBUG_DPRINTF;
-#endif /* _KERNEL */
-	}
 }
 
 void
 zfs_dbgmsg_fini(void)
 {
-#if !defined(_KERNEL) || !defined(__linux__)
 	zfs_dbgmsg_t *zdm;
 
 	while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) {
@@ -127,25 +50,24 @@ zfs_dbgmsg_fini(void)
 	}
 	mutex_destroy(&zfs_dbgmsgs_lock);
 	ASSERT0(zfs_dbgmsg_size);
-#endif
 }
 
-#if !defined(_KERNEL) || !defined(__linux__)
 /*
- * Print these messages by running:
- * echo ::zfs_dbgmsg | mdb -k
+ * To get this data enable the zfs__dbgmsg tracepoint as shown:
  *
- * Monitor these messages by running:
- * dtrace -qn 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
+ * # Enable zfs__dbgmsg tracepoint, clear the tracepoint ring buffer
+ * $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable
+ * $ echo 0 > /sys/kernel/debug/tracing/trace
  *
- * When used with libzpool, monitor with:
- * dtrace -qn 'zfs$pid::zfs_dbgmsg:probe1{printf("%s\n", copyinstr(arg1))}'
+ * # Dump the ring buffer.
+ * $ cat /sys/kernel/debug/tracing/trace
  */
 void
 zfs_dbgmsg(const char *fmt, ...)
 {
 	int size;
 	va_list adx;
+	char *nl;
 	zfs_dbgmsg_t *zdm;
 
 	va_start(adx, fmt);
@@ -156,13 +78,20 @@ zfs_dbgmsg(const char *fmt, ...)
 	 * There is one byte of string in sizeof (zfs_dbgmsg_t), used
 	 * for the terminating null.
 	 */
-	zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP);
+	zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_PUSHPAGE);
 	zdm->zdm_timestamp = gethrestime_sec();
 
 	va_start(adx, fmt);
 	(void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx);
 	va_end(adx);
 
+	/*
+	 * Get rid of trailing newline.
+	 */
+	nl = strrchr(zdm->zdm_msg, '\n');
+	if (nl != NULL)
+		*nl = '\0';
+
 	DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg);
 
 	mutex_enter(&zfs_dbgmsgs_lock);
@@ -180,6 +109,7 @@ zfs_dbgmsg(const char *fmt, ...)
 void
 zfs_dbgmsg_print(const char *tag)
 {
+#if !defined(_KERNEL)
 	zfs_dbgmsg_t *zdm;
 
 	(void) printf("ZFS_DBGMSG(%s):\n", tag);
@@ -188,17 +118,5 @@ zfs_dbgmsg_print(const char *tag)
 	    zdm = list_next(&zfs_dbgmsgs, zdm))
 		(void) printf("%s\n", zdm->zdm_msg);
 	mutex_exit(&zfs_dbgmsgs_lock);
+#endif /* !_KERNEL */
 }
-#endif
-
-#if defined(_KERNEL)
-module_param(zfs_flags, int, 0644);
-MODULE_PARM_DESC(zfs_flags, "Set additional debugging flags");
-
-module_param(zfs_recover, int, 0644);
-MODULE_PARM_DESC(zfs_recover, "Set to attempt to recover from fatal errors");
-
-module_param(zfs_free_leak_on_eio, int, 0644);
-MODULE_PARM_DESC(zfs_free_leak_on_eio,
-	"Set to ignore IO errors during free and permanently leak the space");
-#endif /* _KERNEL */
diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c
index 37a893c47..9396d6caa 100644
--- a/module/zfs/zfs_ioctl.c
+++ b/module/zfs/zfs_ioctl.c
@@ -247,6 +247,55 @@ static int zfs_fill_zplprops_root(uint64_t, nvlist_t *, nvlist_t *,
 int zfs_set_prop_nvlist(const char *, zprop_source_t, nvlist_t *, nvlist_t *);
 static int get_nvlist(uint64_t nvl, uint64_t size, int iflag, nvlist_t **nvp);
 
+#if defined(HAVE_DECLARE_EVENT_CLASS)
+void
+__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
+{
+	const char *newfile;
+	size_t size = 4096;
+	char *buf = kmem_alloc(size, KM_PUSHPAGE);
+	char *nl;
+	va_list adx;
+
+	/*
+	 * Get rid of annoying prefix to filename.
+	 */
+	newfile = strrchr(file, '/');
+	if (newfile != NULL) {
+		newfile = newfile + 1; /* Get rid of leading / */
+	} else {
+		newfile = file;
+	}
+
+	va_start(adx, fmt);
+	(void) vsnprintf(buf, size, fmt, adx);
+	va_end(adx);
+
+	/*
+	 * Get rid of trailing newline.
+	 */
+	nl = strrchr(buf, '\n');
+	if (nl != NULL)
+		*nl = '\0';
+
+	/*
+	 * To get this data enable the zfs__dprintf trace point as shown:
+	 *
+	 * # Enable zfs__dprintf tracepoint, clear the tracepoint ring buffer
+	 * $ echo 1 > /sys/module/zfs/parameters/zfs_flags
+	 * $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable
+	 * $ echo 0 > /sys/kernel/debug/tracing/trace
+	 *
+	 * # Dump the ring buffer.
+	 * $ cat /sys/kernel/debug/tracing/trace
+	 */
+	DTRACE_PROBE4(zfs__dprintf,
+	    char *, newfile, char *, func, int, line, char *, buf);
+
+	kmem_free(buf, size);
+}
+#endif /* HAVE_DECLARE_EVENT_CLASS */
+
 static void
 history_str_free(char *buf)
 {
diff --git a/scripts/zfs.sh b/scripts/zfs.sh
index b97a0577f..55584ddd1 100755
--- a/scripts/zfs.sh
+++ b/scripts/zfs.sh
@@ -33,7 +33,6 @@ MODULE-OPTIONS:
 
 $0 zfs="zfs_prefetch_disable=1"
 $0 zfs="zfs_prefetch_disable=1 zfs_mdcomp_disable=1"
-$0 spl="spl_debug_mask=0"
 
 EOF
 }