25 files changed, 572 insertions, 2344 deletions

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8b1797c4545..c7683fd8a03 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -194,15 +194,6 @@ config PREEMPT_TRACER
 	  enabled. This option and the irqs-off timing option can be
 	  used together or separately.)
 
-config SYSPROF_TRACER
-	bool "Sysprof Tracer"
-	depends on X86
-	select GENERIC_TRACER
-	select CONTEXT_SWITCH_TRACER
-	help
-	  This tracer provides the trace needed by the 'Sysprof' userspace
-	  tool.
-
 config SCHED_TRACER
 	bool "Scheduling Latency Tracer"
 	select GENERIC_TRACER
@@ -229,23 +220,6 @@ config FTRACE_SYSCALLS
 	help
 	  Basic tracer to catch the syscall entry and exit events.
 
-config BOOT_TRACER
-	bool "Trace boot initcalls"
-	select GENERIC_TRACER
-	select CONTEXT_SWITCH_TRACER
-	help
-	  This tracer helps developers to optimize boot times: it records
-	  the timings of the initcalls and traces key events and the identity
-	  of tasks that can cause boot delays, such as context-switches.
-
-	  Its aim is to be parsed by the scripts/bootgraph.pl tool to
-	  produce pretty graphics about boot inefficiencies, giving a visual
-	  representation of the delays during initcalls - but the raw
-	  /debug/tracing/trace text output is readable too.
-
-	  You must pass in initcall_debug and ftrace=initcall to the kernel
-	  command line to enable this on bootup.
-
 config TRACE_BRANCH_PROFILING
 	bool
 	select GENERIC_TRACER
@@ -325,28 +299,6 @@ config BRANCH_TRACER
 
 	  Say N if unsure.
 
-config KSYM_TRACER
-	bool "Trace read and write access on kernel memory locations"
-	depends on HAVE_HW_BREAKPOINT
-	select TRACING
-	help
-	  This tracer helps find read and write operations on any given kernel
-	  symbol i.e. /proc/kallsyms.
-
-config PROFILE_KSYM_TRACER
-	bool "Profile all kernel memory accesses on 'watched' variables"
-	depends on KSYM_TRACER
-	help
-	  This tracer profiles kernel accesses on variables watched through the
-	  ksym tracer ftrace plugin. Depending upon the hardware, all read
-	  and write operations on kernel variables can be monitored for
-	  accesses.
-
-	  The results will be displayed in:
-	  /debugfs/tracing/profile_ksym
-
-	  Say N if unsure.
-
 config STACK_TRACER
 	bool "Trace max stack"
 	depends on HAVE_FUNCTION_TRACER
@@ -371,26 +323,6 @@ config STACK_TRACER
 
 	  Say N if unsure.
 
-config KMEMTRACE
-	bool "Trace SLAB allocations"
-	select GENERIC_TRACER
-	help
-	  kmemtrace provides tracing for slab allocator functions, such as
-	  kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
-	  data is then fed to the userspace application in order to analyse
-	  allocation hotspots, internal fragmentation and so on, making it
-	  possible to see how well an allocator performs, as well as debug
-	  and profile kernel code.
-
-	  This requires an userspace application to use. See
-	  Documentation/trace/kmemtrace.txt for more information.
-
-	  Saying Y will make the kernel somewhat larger and slower. However,
-	  if you disable kmemtrace at run-time or boot-time, the performance
-	  impact is minimal (depending on the arch the kernel is built for).
-
-	  If unsure, say N.
-
 config WORKQUEUE_TRACER
 	bool "Trace workqueues"
 	select GENERIC_TRACER
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 4215530b490..53f338190b2 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_TRACING) += trace_output.o
 obj-$(CONFIG_TRACING) += trace_stat.o
 obj-$(CONFIG_TRACING) += trace_printk.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
-obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
@@ -38,10 +37,8 @@ obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
 obj-$(CONFIG_NOP_TRACER) += trace_nop.o
 obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
-obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
 obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
 obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
-obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
 obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
 obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
 ifeq ($(CONFIG_BLOCK),y)
@@ -55,7 +52,6 @@ obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
 endif
 obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
 obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
-obj-$(CONFIG_KSYM_TRACER) += trace_ksym.o
 obj-$(CONFIG_EVENT_TRACING) += power-traces.o
 ifeq ($(CONFIG_TRACING),y)
 obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 6d2cb14f944..0d88ce9b9fb 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1883,7 +1883,6 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
 	struct hlist_head *hhd;
 	struct hlist_node *n;
 	unsigned long key;
-	int resched;
 
 	key = hash_long(ip, FTRACE_HASH_BITS);
 
@@ -1897,12 +1896,12 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
 	 * period. This syncs the hash iteration and freeing of items
 	 * on the hash. rcu_read_lock is too dangerous here.
 	 */
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 	hlist_for_each_entry_rcu(entry, n, hhd, node) {
 		if (entry->ip == ip)
 			entry->ops->func(ip, parent_ip, &entry->data);
 	}
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_probe_ops __read_mostly =
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
deleted file mode 100644
index bbfc1bb1660..00000000000
--- a/kernel/trace/kmemtrace.c
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * Memory allocator tracing
- *
- * Copyright (C) 2008 Eduard - Gabriel Munteanu
- * Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- */
-
-#include <linux/tracepoint.h>
-#include <linux/seq_file.h>
-#include <linux/debugfs.h>
-#include <linux/dcache.h>
-#include <linux/fs.h>
-
-#include <linux/kmemtrace.h>
-
-#include "trace_output.h"
-#include "trace.h"
-
-/* Select an alternative, minimalistic output than the original one */
-#define TRACE_KMEM_OPT_MINIMAL	0x1
-
-static struct tracer_opt kmem_opts[] = {
-	/* Default disable the minimalistic output */
-	{ TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
-	{ }
-};
-
-static struct tracer_flags kmem_tracer_flags = {
-	.val			= 0,
-	.opts			= kmem_opts
-};
-
-static struct trace_array *kmemtrace_array;
-
-/* Trace allocations */
-static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
-				   unsigned long call_site,
-				   const void *ptr,
-				   size_t bytes_req,
-				   size_t bytes_alloc,
-				   gfp_t gfp_flags,
-				   int node)
-{
-	struct ftrace_event_call *call = &event_kmem_alloc;
-	struct trace_array *tr = kmemtrace_array;
-	struct kmemtrace_alloc_entry *entry;
-	struct ring_buffer_event *event;
-
-	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
-	if (!event)
-		return;
-
-	entry = ring_buffer_event_data(event);
-	tracing_generic_entry_update(&entry->ent, 0, 0);
-
-	entry->ent.type		= TRACE_KMEM_ALLOC;
-	entry->type_id		= type_id;
-	entry->call_site	= call_site;
-	entry->ptr		= ptr;
-	entry->bytes_req	= bytes_req;
-	entry->bytes_alloc	= bytes_alloc;
-	entry->gfp_flags	= gfp_flags;
-	entry->node		= node;
-
-	if (!filter_check_discard(call, entry, tr->buffer, event))
-		ring_buffer_unlock_commit(tr->buffer, event);
-
-	trace_wake_up();
-}
-
-static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
-				  unsigned long call_site,
-				  const void *ptr)
-{
-	struct ftrace_event_call *call = &event_kmem_free;
-	struct trace_array *tr = kmemtrace_array;
-	struct kmemtrace_free_entry *entry;
-	struct ring_buffer_event *event;
-
-	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
-	if (!event)
-		return;
-	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(&entry->ent, 0, 0);
-
-	entry->ent.type		= TRACE_KMEM_FREE;
-	entry->type_id		= type_id;
-	entry->call_site	= call_site;
-	entry->ptr		= ptr;
-
-	if (!filter_check_discard(call, entry, tr->buffer, event))
-		ring_buffer_unlock_commit(tr->buffer, event);
-
-	trace_wake_up();
-}
-
-static void kmemtrace_kmalloc(void *ignore,
-			      unsigned long call_site,
-			      const void *ptr,
-			      size_t bytes_req,
-			      size_t bytes_alloc,
-			      gfp_t gfp_flags)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmem_cache_alloc(void *ignore,
-				       unsigned long call_site,
-				       const void *ptr,
-				       size_t bytes_req,
-				       size_t bytes_alloc,
-				       gfp_t gfp_flags)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmalloc_node(void *ignore,
-				   unsigned long call_site,
-				   const void *ptr,
-				   size_t bytes_req,
-				   size_t bytes_alloc,
-				   gfp_t gfp_flags,
-				   int node)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void kmemtrace_kmem_cache_alloc_node(void *ignore,
-					    unsigned long call_site,
-					    const void *ptr,
-					    size_t bytes_req,
-					    size_t bytes_alloc,
-					    gfp_t gfp_flags,
-					    int node)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void
-kmemtrace_kfree(void *ignore, unsigned long call_site, const void *ptr)
-{
-	kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
-}
-
-static void kmemtrace_kmem_cache_free(void *ignore,
-				      unsigned long call_site, const void *ptr)
-{
-	kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
-}
-
-static int kmemtrace_start_probes(void)
-{
-	int err;
-
-	err = register_trace_kmalloc(kmemtrace_kmalloc, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
-	if (err)
-		return err;
-	err = register_trace_kfree(kmemtrace_kfree, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-
-	return err;
-}
-
-static void kmemtrace_stop_probes(void)
-{
-	unregister_trace_kmalloc(kmemtrace_kmalloc, NULL);
-	unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
-	unregister_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
-	unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
-	unregister_trace_kfree(kmemtrace_kfree, NULL);
-	unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-}
-
-static int kmem_trace_init(struct trace_array *tr)
-{
-	kmemtrace_array = tr;
-
-	tracing_reset_online_cpus(tr);
-
-	kmemtrace_start_probes();
-
-	return 0;
-}
-
-static void kmem_trace_reset(struct trace_array *tr)
-{
-	kmemtrace_stop_probes();
-}
-
-static void kmemtrace_headers(struct seq_file *s)
-{
-	/* Don't need headers for the original kmemtrace output */
-	if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
-		return;
-
-	seq_printf(s, "#\n");
-	seq_printf(s, "# ALLOC  TYPE  REQ   GIVEN  FLAGS     "
-			"      POINTER         NODE    CALLER\n");
-	seq_printf(s, "# FREE   |      |     |       |       "
-			"       |   |            |        |\n");
-	seq_printf(s, "# |\n\n");
-}
-
-/*
- * The following functions give the original output from kmemtrace,
- * plus the origin CPU, since reordering occurs in-kernel now.
- */
-
-#define KMEMTRACE_USER_ALLOC	0
-#define KMEMTRACE_USER_FREE	1
-
-struct kmemtrace_user_event {
-	u8			event_id;
-	u8			type_id;
-	u16			event_size;
-	u32			cpu;
-	u64			timestamp;
-	unsigned long		call_site;
-	unsigned long		ptr;
-};
-
-struct kmemtrace_user_event_alloc {
-	size_t			bytes_req;
-	size_t			bytes_alloc;
-	unsigned		gfp_flags;
-	int			node;
-};
-
-static enum print_line_t
-kmemtrace_print_alloc(struct trace_iterator *iter, int flags,
-		      struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_alloc_entry *entry;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu "
-	    "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
-	    entry->type_id, (void *)entry->call_site, (unsigned long)entry->ptr,
-	    (unsigned long)entry->bytes_req, (unsigned long)entry->bytes_alloc,
-	    (unsigned long)entry->gfp_flags, entry->node);
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free(struct trace_iterator *iter, int flags,
-		     struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_free_entry *entry;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu\n",
-			       entry->type_id, (void *)entry->call_site,
-			       (unsigned long)entry->ptr);
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_alloc_user(struct trace_iterator *iter, int flags,
-			   struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_alloc_entry *entry;
-	struct kmemtrace_user_event *ev;
-	struct kmemtrace_user_event_alloc *ev_alloc;
-
-	trace_assign_type(entry, iter->ent);
-
-	ev = trace_seq_reserve(s, sizeof(*ev));
-	if (!ev)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	ev->event_id		= KMEMTRACE_USER_ALLOC;
-	ev->type_id		= entry->type_id;
-	ev->event_size		= sizeof(*ev) + sizeof(*ev_alloc);
-	ev->cpu			= iter->cpu;
-	ev->timestamp		= iter->ts;
-	ev->call_site		= entry->call_site;
-	ev->ptr			= (unsigned long)entry->ptr;
-
-	ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
-	if (!ev_alloc)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	ev_alloc->bytes_req	= entry->bytes_req;
-	ev_alloc->bytes_alloc	= entry->bytes_alloc;
-	ev_alloc->gfp_flags	= entry->gfp_flags;
-	ev_alloc->node		= entry->node;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_user(struct trace_iterator *iter, int flags,
-			  struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_free_entry *entry;
-	struct kmemtrace_user_event *ev;
-
-	trace_assign_type(entry, iter->ent);
-
-	ev = trace_seq_reserve(s, sizeof(*ev));
-	if (!ev)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	ev->event_id		= KMEMTRACE_USER_FREE;
-	ev->type_id		= entry->type_id;
-	ev->event_size		= sizeof(*ev);
-	ev->cpu			= iter->cpu;
-	ev->timestamp		= iter->ts;
-	ev->call_site		= entry->call_site;
-	ev->ptr			= (unsigned long)entry->ptr;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-/* The two other following provide a more minimalistic output */
-static enum print_line_t
-kmemtrace_print_alloc_compress(struct trace_iterator *iter)
-{
-	struct kmemtrace_alloc_entry *entry;
-	struct trace_seq *s = &iter->seq;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	/* Alloc entry */
-	ret = trace_seq_printf(s, "  +      ");
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Type */
-	switch (entry->type_id) {
-	case KMEMTRACE_TYPE_KMALLOC:
-		ret = trace_seq_printf(s, "K   ");
-		break;
-	case KMEMTRACE_TYPE_CACHE:
-		ret = trace_seq_printf(s, "C   ");
-		break;
-	case KMEMTRACE_TYPE_PAGES:
-		ret = trace_seq_printf(s, "P   ");
-		break;
-	default:
-		ret = trace_seq_printf(s, "?   ");
-	}
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Requested */
-	ret = trace_seq_printf(s, "%4zu   ", entry->bytes_req);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Allocated */
-	ret = trace_seq_printf(s, "%4zu   ", entry->bytes_alloc);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Flags
-	 * TODO: would be better to see the name of the GFP flag names
-	 */
-	ret = trace_seq_printf(s, "%08x   ", entry->gfp_flags);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Pointer to allocated */
-	ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Node and call site*/
-	ret = trace_seq_printf(s, "%4d   %pf\n", entry->node,
-						 (void *)entry->call_site);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_compress(struct trace_iterator *iter)
-{
-	struct kmemtrace_free_entry *entry;
-	struct trace_seq *s = &iter->seq;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	/* Free entry */
-	ret = trace_seq_printf(s, "  -      ");
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Type */
-	switch (entry->type_id) {
-	case KMEMTRACE_TYPE_KMALLOC:
-		ret = trace_seq_printf(s, "K     ");
-		break;
-	case KMEMTRACE_TYPE_CACHE:
-		ret = trace_seq_printf(s, "C     ");
-		break;
-	case KMEMTRACE_TYPE_PAGES:
-		ret = trace_seq_printf(s, "P     ");
-		break;
-	default:
-		ret = trace_seq_printf(s, "?     ");
-	}
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Skip requested/allocated/flags */
-	ret = trace_seq_printf(s, "                       ");
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Pointer to allocated */
-	ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Skip node and print call site*/
-	ret = trace_seq_printf(s, "       %pf\n", (void *)entry->call_site);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
-{
-	struct trace_entry *entry = iter->ent;
-
-	if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
-		return TRACE_TYPE_UNHANDLED;
-
-	switch (entry->type) {
-	case TRACE_KMEM_ALLOC:
-		return kmemtrace_print_alloc_compress(iter);
-	case TRACE_KMEM_FREE:
-		return kmemtrace_print_free_compress(iter);
-	default:
-		return TRACE_TYPE_UNHANDLED;
-	}
-}
-
-static struct trace_event_functions kmem_trace_alloc_funcs = {
-	.trace			= kmemtrace_print_alloc,
-	.binary			= kmemtrace_print_alloc_user,
-};
-
-static struct trace_event kmem_trace_alloc = {
-	.type			= TRACE_KMEM_ALLOC,
-	.funcs			= &kmem_trace_alloc_funcs,
-};
-
-static struct trace_event_functions kmem_trace_free_funcs = {
-	.trace			= kmemtrace_print_free,
-	.binary			= kmemtrace_print_free_user,
-};
-
-static struct trace_event kmem_trace_free = {
-	.type			= TRACE_KMEM_FREE,
-	.funcs			= &kmem_trace_free_funcs,
-};
-
-static struct tracer kmem_tracer __read_mostly = {
-	.name			= "kmemtrace",
-	.init			= kmem_trace_init,
-	.reset			= kmem_trace_reset,
-	.print_line		= kmemtrace_print_line,
-	.print_header		= kmemtrace_headers,
-	.flags			= &kmem_tracer_flags
-};
-
-void kmemtrace_init(void)
-{
-	/* earliest opportunity to start kmem tracing */
-}
-
-static int __init init_kmem_tracer(void)
-{
-	if (!register_ftrace_event(&kmem_trace_alloc)) {
-		pr_warning("Warning: could not register kmem events\n");
-		return 1;
-	}
-
-	if (!register_ftrace_event(&kmem_trace_free)) {
-		pr_warning("Warning: could not register kmem events\n");
-		return 1;
-	}
-
-	if (register_tracer(&kmem_tracer) != 0) {
-		pr_warning("Warning: could not register the kmem tracer\n");
-		return 1;
-	}
-
-	return 0;
-}
-device_initcall(init_kmem_tracer);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 1da7b6ea8b8..3632ce87674 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -443,6 +443,7 @@ int ring_buffer_print_page_header(struct trace_seq *s)
  */
 struct ring_buffer_per_cpu {
 	int				cpu;
+	atomic_t			record_disabled;
 	struct ring_buffer		*buffer;
 	spinlock_t			reader_lock;	/* serialize readers */
 	arch_spinlock_t			lock;
@@ -462,7 +463,6 @@ struct ring_buffer_per_cpu {
 	unsigned long			read;
 	u64				write_stamp;
 	u64				read_stamp;
-	atomic_t			record_disabled;
 };
 
 struct ring_buffer {
@@ -2242,8 +2242,6 @@ static void trace_recursive_unlock(void)
 
 #endif
 
-static DEFINE_PER_CPU(int, rb_need_resched);
-
 /**
  * ring_buffer_lock_reserve - reserve a part of the buffer
  * @buffer: the ring buffer to reserve from
@@ -2264,13 +2262,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
 {
 	struct ring_buffer_per_cpu *cpu_buffer;
 	struct ring_buffer_event *event;
-	int cpu, resched;
+	int cpu;
 
 	if (ring_buffer_flags != RB_BUFFERS_ON)
 		return NULL;
 
 	/* If we are tracing schedule, we don't want to recurse */
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 
 	if (atomic_read(&buffer->record_disabled))
 		goto out_nocheck;
@@ -2295,21 +2293,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
 	if (!event)
 		goto out;
 
-	/*
-	 * Need to store resched state on this cpu.
-	 * Only the first needs to.
-	 */
-
-	if (preempt_count() == 1)
-		per_cpu(rb_need_resched, cpu) = resched;
-
 	return event;
 
  out:
 	trace_recursive_unlock();
 
  out_nocheck:
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 	return NULL;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
@@ -2355,13 +2345,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
 
 	trace_recursive_unlock();
 
-	/*
-	 * Only the last preempt count needs to restore preemption.
-	 */
-	if (preempt_count() == 1)
-		ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
-	else
-		preempt_enable_no_resched_notrace();
+	preempt_enable_notrace();
 
 	return 0;
 }
@@ -2469,13 +2453,7 @@ void ring_buffer_discard_commit(struct ring_buffer *buffer,
 
 	trace_recursive_unlock();
 
-	/*
-	 * Only the last preempt count needs to restore preemption.
-	 */
-	if (preempt_count() == 1)
-		ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
-	else
-		preempt_enable_no_resched_notrace();
+	preempt_enable_notrace();
 
 }
 EXPORT_SYMBOL_GPL(ring_buffer_discard_commit);
@@ -2501,12 +2479,12 @@ int ring_buffer_write(struct ring_buffer *buffer,
 	struct ring_buffer_event *event;
 	void *body;
 	int ret = -EBUSY;
-	int cpu, resched;
+	int cpu;
 
 	if (ring_buffer_flags != RB_BUFFERS_ON)
 		return -EBUSY;
 
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 
 	if (atomic_read(&buffer->record_disabled))
 		goto out;
@@ -2536,7 +2514,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
 
 	ret = 0;
  out:
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 
 	return ret;
 }
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d6736b93dc2..ed1032d6f81 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -341,7 +341,7 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 /* trace_flags holds trace_options default values */
 unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
 	TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
-	TRACE_ITER_GRAPH_TIME;
+	TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD;
 
 static int trace_stop_count;
 static DEFINE_SPINLOCK(tracing_start_lock);
@@ -425,6 +425,7 @@ static const char *trace_options[] = {
 	"latency-format",
 	"sleep-time",
 	"graph-time",
+	"record-cmd",
 	NULL
 };
 
@@ -656,6 +657,10 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 		return;
 
 	WARN_ON_ONCE(!irqs_disabled());
+	if (!current_trace->use_max_tr) {
+		WARN_ON_ONCE(1);
+		return;
+	}
 	arch_spin_lock(&ftrace_max_lock);
 
 	tr->buffer = max_tr.buffer;
@@ -682,6 +687,11 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
 		return;
 
 	WARN_ON_ONCE(!irqs_disabled());
+	if (!current_trace->use_max_tr) {
+		WARN_ON_ONCE(1);
+		return;
+	}
+
 	arch_spin_lock(&ftrace_max_lock);
 
 	ftrace_disable_cpu();
@@ -726,7 +736,7 @@ __acquires(kernel_lock)
 		return -1;
 	}
 
-	if (strlen(type->name) > MAX_TRACER_SIZE) {
+	if (strlen(type->name) >= MAX_TRACER_SIZE) {
 		pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE);
 		return -1;
 	}
@@ -1328,61 +1338,6 @@ static void __trace_userstack(struct trace_array *tr, unsigned long flags)
 
 #endif /* CONFIG_STACKTRACE */
 
-static void
-ftrace_trace_special(void *__tr,
-		     unsigned long arg1, unsigned long arg2, unsigned long arg3,
-		     int pc)
-{
-	struct ftrace_event_call *call = &event_special;
-	struct ring_buffer_event *event;
-	struct trace_array *tr = __tr;
-	struct ring_buffer *buffer = tr->buffer;
-	struct special_entry *entry;
-
-	event = trace_buffer_lock_reserve(buffer, TRACE_SPECIAL,
-					  sizeof(*entry), 0, pc);
-	if (!event)
-		return;
-	entry	= ring_buffer_event_data(event);
-	entry->arg1			= arg1;
-	entry->arg2			= arg2;
-	entry->arg3			= arg3;
-
-	if (!filter_check_discard(call, entry, buffer, event))
-		trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-void
-__trace_special(void *__tr, void *__data,
-		unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-	ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count());
-}
-
-void
-ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-	struct trace_array *tr = &global_trace;
-	struct trace_array_cpu *data;
-	unsigned long flags;
-	int cpu;
-	int pc;
-
-	if (tracing_disabled)
-		return;
-
-	pc = preempt_count();
-	local_irq_save(flags);
-	cpu = raw_smp_processor_id();
-	data = tr->data[cpu];
-
-	if (likely(atomic_inc_return(&data->disabled) == 1))
-		ftrace_trace_special(tr, arg1, arg2, arg3, pc);
-
-	atomic_dec(&data->disabled);
-	local_irq_restore(flags);
-}
-
 /**
  * trace_vbprintk - write binary msg to tracing buffer
  *
@@ -1401,7 +1356,6 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
 	struct bprint_entry *entry;
 	unsigned long flags;
 	int disable;
-	int resched;
 	int cpu, len = 0, size, pc;
 
 	if (unlikely(tracing_selftest_running || tracing_disabled))
@@ -1411,7 +1365,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
 	pause_graph_tracing();
 
 	pc = preempt_count();
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 	cpu = raw_smp_processor_id();
 	data = tr->data[cpu];
 
@@ -1449,7 +1403,7 @@ out_unlock:
 
 out:
 	atomic_dec_return(&data->disabled);
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 	unpause_graph_tracing();
 
 	return len;
@@ -2386,6 +2340,7 @@ static const struct file_operations show_traces_fops = {
 	.open		= show_traces_open,
 	.read		= seq_read,
 	.release	= seq_release,
+	.llseek		= seq_lseek,
 };
 
 /*
@@ -2479,6 +2434,7 @@ static const struct file_operations tracing_cpumask_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_cpumask_read,
 	.write		= tracing_cpumask_write,
+	.llseek		= generic_file_llseek,
 };
 
 static int tracing_trace_options_show(struct seq_file *m, void *v)
@@ -2554,6 +2510,9 @@ static void set_tracer_flags(unsigned int mask, int enabled)
 		trace_flags |= mask;
 	else
 		trace_flags &= ~mask;
+
+	if (mask == TRACE_ITER_RECORD_CMD)
+		trace_event_enable_cmd_record(enabled);
 }
 
 static ssize_t
@@ -2645,6 +2604,7 @@ tracing_readme_read(struct file *filp, char __use