Message-ID: <1435250664-32578-1-git-send-email-jbacik@fb.com>
Date:	Thu, 25 Jun 2015 09:44:24 -0700
From:	Josef Bacik <jbacik@...com>
To:	<linux-kernel@...r.kernel.org>, <rostedt@...dmis.org>,
	<kernel-team@...com>
Subject: [PATCH V2] trace-cmd: add a kernel memory leak detector

I needed to track down a very slow memory leak so I adapted the same approach
trace-cmd profile uses to track kernel memory allocations.  You run this with

trace-cmd kmemleak

and then you can kill -SIGUSR2 <trace-cmd pid> to get current status updates, or
just stop the process when you are ready.  It will tell you how much was lost
and the size of the objects that were allocated, along with the tracebacks and
the counts of the allocators.  Thanks,

Signed-off-by: Josef Bacik <jbacik@...com>
---
V1->V2: add the copyright/license stuff to trace-kmemleak.c

 Makefile         |   2 +-
 trace-cmd.c      |   3 +-
 trace-cmd.h      |   6 +
 trace-hash.h     |   5 +
 trace-input.c    |  23 +++
 trace-kmemleak.c | 571 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 trace-local.h    |  20 +-
 trace-profile.c  |  10 +-
 trace-read.c     |  13 +-
 trace-record.c   |  71 +++++--
 trace-stream.c   |  12 +-
 trace-usage.c    |   6 +
 12 files changed, 699 insertions(+), 43 deletions(-)
 create mode 100644 trace-kmemleak.c

diff --git a/Makefile b/Makefile
index 402f711..1e3626e 100644
--- a/Makefile
+++ b/Makefile
@@ -308,7 +308,7 @@ TRACE_GUI_OBJS = trace-filter.o trace-compat.o trace-filter-hash.o trace-dialog.
 		trace-xml.o
 TRACE_CMD_OBJS = trace-cmd.o trace-record.o trace-read.o trace-split.o trace-listen.o \
 	 trace-stack.o trace-hist.o trace-mem.o trace-snapshot.o trace-stat.o \
-	 trace-hash.o trace-profile.o trace-stream.o
+	 trace-hash.o trace-profile.o trace-stream.o trace-kmemleak.o
 TRACE_VIEW_OBJS = trace-view.o trace-view-store.o
 TRACE_GRAPH_OBJS = trace-graph.o trace-plot.o trace-plot-cpu.o trace-plot-task.o
 TRACE_VIEW_MAIN_OBJS = trace-view-main.o $(TRACE_VIEW_OBJS) $(TRACE_GUI_OBJS)
diff --git a/trace-cmd.c b/trace-cmd.c
index 4c5b564..fc30c3c 100644
--- a/trace-cmd.c
+++ b/trace-cmd.c
@@ -483,7 +483,8 @@ int main (int argc, char **argv)
 		   strcmp(argv[1], "stream") == 0 ||
 		   strcmp(argv[1], "profile") == 0 ||
 		   strcmp(argv[1], "restart") == 0 ||
-		   strcmp(argv[1], "reset") == 0) {
+		   strcmp(argv[1], "reset") == 0 ||
+		   strcmp(argv[1], "kmemleak") == 0) {
 		trace_record(argc, argv);
 		exit(0);
 
diff --git a/trace-cmd.h b/trace-cmd.h
index 7bce2a5..50e2b79 100644
--- a/trace-cmd.h
+++ b/trace-cmd.h
@@ -103,6 +103,9 @@ struct tracecmd_ftrace {
 	int long_size;
 };
 
+typedef void (*trace_show_data_func)(struct tracecmd_input *handle,
+				     struct pevent_record *record);
+
 struct tracecmd_input *tracecmd_alloc(const char *file);
 struct tracecmd_input *tracecmd_alloc_fd(int fd);
 struct tracecmd_input *tracecmd_open(const char *file);
@@ -184,6 +187,9 @@ tracecmd_get_cursor(struct tracecmd_input *handle, int cpu);
 int tracecmd_ftrace_overrides(struct tracecmd_input *handle, struct tracecmd_ftrace *finfo);
 struct pevent *tracecmd_get_pevent(struct tracecmd_input *handle);
 bool tracecmd_get_use_trace_clock(struct tracecmd_input *handle);
+trace_show_data_func tracecmd_get_show_data_func(struct tracecmd_input *handle);
+void tracecmd_set_show_data_func(struct tracecmd_input *handle,
+				 trace_show_data_func func);
 
 char *tracecmd_get_tracing_file(const char *name);
 void tracecmd_put_tracing_file(char *name);
diff --git a/trace-hash.h b/trace-hash.h
index 2529f4d..2636a9c 100644
--- a/trace-hash.h
+++ b/trace-hash.h
@@ -44,9 +44,14 @@ static inline void trace_hash_del(struct trace_hash_item *item)
 {
 	struct trace_hash_item *prev = item->prev;
 
+	if (!prev)
+		return;
+
 	prev->next = item->next;
 	if (item->next)
 		item->next->prev = prev;
+	item->next = NULL;
+	item->prev = NULL;
 }
 
 #define trace_hash_for_each_bucket(bucket, hash)			\
diff --git a/trace-input.c b/trace-input.c
index 4120189..bb8076d 100644
--- a/trace-input.c
+++ b/trace-input.c
@@ -37,6 +37,7 @@
 #include <errno.h>
 
 #include "trace-cmd-local.h"
+#include "trace-local.h"
 #include "kbuffer.h"
 #include "list.h"
 
@@ -108,6 +109,9 @@ struct tracecmd_input {
 	size_t			ftrace_files_start;
 	size_t			event_files_start;
 	size_t			total_file_size;
+
+	/* For custom profilers. */
+	trace_show_data_func	show_data_func;
 };
 
 __thread struct tracecmd_input *tracecmd_curr_thread_handle;
@@ -2938,3 +2942,22 @@ bool tracecmd_get_use_trace_clock(struct tracecmd_input *handle)
 {
 	return handle->use_trace_clock;
 }
+
+/**
+ * tracecmd_get_show_data_func - return the show data func
+ * @handle: input handle for the trace.dat file
+ */
+trace_show_data_func tracecmd_get_show_data_func(struct tracecmd_input *handle)
+{
+	return handle->show_data_func;
+}
+
+/**
+ * tracecmd_set_show_data_func - set the show data func
+ * @handle: input handle for the trace.dat file
+ */
+void tracecmd_set_show_data_func(struct tracecmd_input *handle,
+				 trace_show_data_func func)
+{
+	handle->show_data_func = func;
+}
diff --git a/trace-kmemleak.c b/trace-kmemleak.c
new file mode 100644
index 0000000..0590b4a
--- /dev/null
+++ b/trace-kmemleak.c
@@ -0,0 +1,571 @@
+/*
+ * Copyright (C) 2015 Facebook, Josef Bacik <jbacik@...com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not,  see <http://www.gnu.org/licenses>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#define _LARGEFILE64_SOURCE
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <signal.h>
+
+#include "trace-local.h"
+#include "trace-hash.h"
+#include "list.h"
+
+#define memory_from_item(item)	container_of(item, struct memory, hash)
+#define memory_from_phash(item)	container_of(item, struct memory, phash)
+#define leak_from_item(item)	container_of(item, struct memory_leak, hash)
+#define edata_from_item(item)	container_of(item, struct event_data, hash)
+#define stack_from_item(item)	container_of(item, struct stack_trace, hash)
+
+struct kmemleak_handle {
+	struct trace_hash	event_hash;
+	struct trace_hash	alloc_hash;
+	struct trace_hash	pid_hash;
+	struct tracecmd_input	*handle;
+	struct pevent		*pevent;
+	struct format_field	*common_pid;
+	struct kmemleak_handle	*next;
+};
+
+struct memory {
+	struct trace_hash_item	hash;
+	struct trace_hash_item	phash;
+	unsigned long		pid;
+	unsigned long		ptr;
+	size_t			alloc_size;
+	unsigned long		stack_size;
+	char			*caller;
+};
+
+struct stack_trace {
+	struct trace_hash_item	hash;
+	char			*caller;
+	unsigned long		size;
+	int			count;
+};
+
+struct memory_leak {
+	struct trace_hash_item	hash;
+	size_t			total_lost;
+	struct trace_hash	stack_hash;
+};
+
+struct event_data;
+typedef void (*event_handler)(struct kmemleak_handle *h,
+			      struct pevent_record *record,
+			      struct event_data *edata);
+
+struct event_data {
+	struct trace_hash_item	hash;
+	int			id;
+	struct format_field	*ptr_field;
+	struct format_field	*data_field;
+	event_handler		handler;
+};
+
+static struct kmemleak_handle *handles = NULL;
+static struct kmemleak_handle *last_handle = NULL;
+
+static int match_pid(struct trace_hash_item *item, void *data)
+{
+	struct memory *mem = memory_from_phash(item);
+	unsigned long pid = (unsigned long)data;
+
+	return mem->pid == pid;
+}
+
+static void handle_kmalloc(struct kmemleak_handle *h,
+			   struct pevent_record *record,
+			   struct event_data *edata)
+{
+	struct memory *mem;
+	unsigned long long ptr, size, pid;
+	int ret;
+
+	mem = malloc_or_die(sizeof(*mem));
+	memset(mem, 0, sizeof(*mem));
+	ret = pevent_read_number_field(edata->ptr_field, record->data, &ptr);
+	ret |= pevent_read_number_field(edata->data_field, record->data,
+					&size);
+	ret |= pevent_read_number_field(h->common_pid, record->data, &pid);
+	if (ret)
+		die("missing important filed in kmalloc");
+
+	mem->ptr = ptr;
+	mem->pid = pid;
+	mem->alloc_size = size;
+	mem->hash.key = trace_hash(mem->ptr);
+	trace_hash_add(&h->alloc_hash, &mem->hash);
+
+	mem->phash.key = trace_hash(pid);
+	trace_hash_add(&h->pid_hash, &mem->phash);
+}
+
+static void handle_stacktrace(struct kmemleak_handle *h,
+			      struct pevent_record *record,
+			      struct event_data *edata)
+{
+	struct memory *mem;
+	struct trace_hash_item *item;
+	void *caller;
+	unsigned long long size, pid;
+	int ret;
+
+	ret = pevent_read_number_field(h->common_pid, record->data, &pid);
+	if (ret)
+		die("missing pid field");
+	item = trace_hash_find(&h->pid_hash, trace_hash(pid), match_pid,
+			       (unsigned long *)pid);
+	if (!item)
+		return;
+	mem = memory_from_phash(item);
+	trace_hash_del(item);
+
+	size = record->size - edata->data_field->offset;
+	caller = record->data + edata->data_field->offset;
+
+	mem->stack_size = size;
+	mem->caller = malloc_or_die(size);
+	memset(mem->caller, 0, size);
+	memcpy(mem->caller, caller, size);
+}
+
+static int match_memory(struct trace_hash_item *item, void *data)
+{
+	struct memory *mem = memory_from_item(item);
+	unsigned long ptr = (unsigned long)data;
+
+	return mem->ptr == ptr;
+}
+
+static void handle_kfree(struct kmemleak_handle *h,
+			 struct pevent_record *record,
+			 struct event_data *edata)
+{
+	struct memory *mem;
+	struct trace_hash_item *item;
+	unsigned long long ptr;
+	unsigned long long key;
+	int ret;
+
+	ret = pevent_read_number_field(edata->ptr_field,
+				       record->data, &ptr);
+	if (ret)
+		die("missing important field in kfree/kmemcache_free");
+
+	key = trace_hash(ptr);
+	item = trace_hash_find(&h->alloc_hash, key, match_memory,
+			       (unsigned long *)ptr);
+	if (!item)
+		return;
+	mem = memory_from_item(item);
+	trace_hash_del(item);
+	trace_hash_del(&mem->phash);
+	if (mem->caller)
+		free(mem->caller);
+	free(mem);
+}
+
+static void handle_missed_events(struct kmemleak_handle *h)
+{
+	struct trace_hash_item **bucket;
+	struct trace_hash_item *item;
+	struct memory *mem;
+
+	trace_hash_for_each_bucket(bucket, &h->alloc_hash) {
+		trace_hash_while_item(item, bucket) {
+			mem = memory_from_item(item);
+			trace_hash_del(item);
+			trace_hash_del(&mem->phash);
+			if (mem->caller)
+				free(mem->caller);
+			free(mem);
+		}
+	}
+
+	trace_hash_for_each_bucket(bucket, &h->pid_hash) {
+		trace_hash_while_item(item, bucket) {
+			mem = memory_from_phash(item);
+			printf("found something on the pid hash\n");
+			trace_hash_del(item);
+			if (mem->caller)
+				free(mem->caller);
+			free(mem);
+		}
+	}
+	fprintf(stderr, "Missed events, results won't be accurate\n");
+}
+
+static void usr1_handler(int signum)
+{
+	trace_kmemleak_output();
+}
+
+void trace_kmemleak_global_init(void)
+{
+	struct sigaction new_action;
+
+	new_action.sa_handler = usr1_handler;
+	sigemptyset(&new_action.sa_mask);
+	new_action.sa_flags = 0;
+
+	sigaction(SIGUSR2, &new_action, NULL);
+}
+
+static int compare_stacks(const void *a, const void *b)
+{
+	struct stack_trace * const *A = a;
+	struct stack_trace * const *B = b;
+
+	if ((*A)->count < (*B)->count)
+		return 1;
+	else if ((*A)->count > (*B)->count)
+		return -1;
+	return 0;
+}
+
+static unsigned long long
+stack_value(struct stack_trace *stack, int longsize, int level)
+{
+	void *ptr;
+
+	ptr = &stack->caller[longsize * level];
+	return longsize == 8 ? *(u64 *)ptr : *(unsigned *)ptr;
+}
+
+static void output_stack(struct kmemleak_handle *h, struct stack_trace *stack)
+{
+	const char *func;
+	unsigned long long val;
+	int longsize = pevent_get_long_size(h->pevent);
+	int cnt = stack->size / longsize, i;
+
+	printf("\tStack count: %d\n", stack->count);
+	for (i = 0; i < cnt; i++) {
+		val = stack_value(stack, longsize, i);
+		func = pevent_find_function(h->pevent, val);
+		if (func)
+			printf("\t\t%s (0x%llx)\n", func, val);
+		else
+			printf("\t\t0x%llx\n", val);
+	}
+}
+
+static void output_stacks(struct kmemleak_handle *h, struct memory_leak *leak)
+{
+	struct trace_hash_item **bucket;
+	struct trace_hash_item *item;
+	struct stack_trace **stacks;
+	int nr_stacks = 0, i;
+
+	trace_hash_for_each_bucket(bucket, &leak->stack_hash) {
+		trace_hash_for_each_item(item, bucket)
+			nr_stacks++;
+	}
+
+	stacks = malloc_or_die(sizeof(*stacks) * nr_stacks);
+
+	nr_stacks = 0;
+	trace_hash_for_each_bucket(bucket, &leak->stack_hash) {
+		trace_hash_while_item(item, bucket) {
+			stacks[nr_stacks++] = stack_from_item(item);
+			trace_hash_del(item);
+		}
+	}
+
+	qsort(stacks, nr_stacks, sizeof(*stacks), compare_stacks);
+
+	for (i = 0; i < nr_stacks; i++) {
+		output_stack(h, stacks[i]);
+		free(stacks[i]->caller);
+		free(stacks[i]);
+	}
+	free(stacks);
+}
+
+static void output_leak(struct kmemleak_handle *h, struct memory_leak *leak)
+{
+	printf("Leaked %llu bytes of size %llu\n",
+	       (unsigned long long)leak->total_lost,
+	       (unsigned long long)leak->hash.key);
+	output_stacks(h, leak);
+}
+
+struct stack_match {
+	void		*caller;
+	unsigned long	size;
+};
+
+static int match_stack(struct trace_hash_item *item, void *data)
+{
+	struct stack_trace *stack = stack_from_item(item);
+	struct stack_match *match = data;
+
+	if (match->size != stack->size)
+		return 0;
+
+	return memcmp(stack->caller, match->caller, stack->size) == 0;
+}
+
+static void add_stack(struct memory_leak *leak, void *caller,
+		      unsigned long size)
+{
+	struct trace_hash_item *item;
+	struct stack_match match;
+	struct stack_trace *stack;
+	unsigned long long key;
+	int i;
+
+	match.caller = caller;
+	match.size = size;
+
+	if (size < sizeof(int))
+		return;
+
+	for (key = 0, i = 0; i <= size - sizeof(int); i += sizeof(int))
+		key += trace_hash(*(int *)(caller + i));
+
+	item = trace_hash_find(&leak->stack_hash, key, match_stack, &match);
+	if (!item) {
+		stack = malloc_or_die(sizeof(*stack));
+		memset(stack, 0, sizeof(*stack));
+		stack->hash.key = key;
+		stack->caller = malloc_or_die(size);
+		memcpy(stack->caller, caller, size);
+		stack->size = size;
+		stack->count = 1;
+		trace_hash_add(&leak->stack_hash, &stack->hash);
+	} else {
+		stack = stack_from_item(item);
+		stack->count++;
+	}
+}
+
+static int compare_leaks(const void *a, const void *b)
+{
+	struct memory_leak * const *A = a;
+	struct memory_leak * const *B = b;
+
+	if ((*A)->total_lost < (*B)->total_lost)
+		return 1;
+	else if ((*A)->total_lost > (*B)->total_lost)
+		return -1;
+	return 0;
+}
+
+static void output_handle(struct kmemleak_handle *h, int *total_leaks)
+{
+	struct memory_leak **leaks;
+	struct trace_hash_item **bucket;
+	struct trace_hash_item *item;
+	struct trace_hash leak_hash;
+	int nr_leaks = 0, i;
+
+	/* God I hope we don't have more than 64 leak buckets */
+	if (trace_hash_init(&leak_hash, 64))
+		die("Couldn't allocate leak hash table");
+
+	trace_hash_for_each_bucket(bucket, &h->alloc_hash) {
+		trace_hash_for_each_item(item, bucket) {
+			struct trace_hash_item *tmp;
+			struct memory *mem;
+			struct memory_leak *leak;
+
+			mem = memory_from_item(item);
+			tmp = trace_hash_find(&leak_hash, mem->alloc_size,
+					      NULL, NULL);
+			if (tmp) {
+				leak = leak_from_item(tmp);
+				leak->total_lost += mem->alloc_size;
+			} else {
+				leak = malloc_or_die(sizeof(*leak));
+				memset(leak, 0, sizeof(*leak));
+				leak->hash.key = mem->alloc_size;
+				leak->total_lost = mem->alloc_size;
+				trace_hash_init(&leak->stack_hash, 1024);
+				trace_hash_add(&leak_hash, &leak->hash);
+				nr_leaks++;
+			}
+			add_stack(leak, mem->caller, mem->stack_size);
+		}
+	}
+
+	if (!nr_leaks)
+		return;
+
+	leaks = malloc_or_die(sizeof(*leaks) * nr_leaks);
+	*total_leaks += nr_leaks;
+	nr_leaks = 0;
+
+	trace_hash_for_each_bucket(bucket, &leak_hash) {
+		trace_hash_while_item(item, bucket) {
+			leaks[nr_leaks++] = leak_from_item(item);
+			trace_hash_del(item);
+		}
+	}
+
+	qsort(leaks, nr_leaks, sizeof(*leaks), compare_leaks);
+
+	for (i = 0; i < nr_leaks; i++) {
+		output_leak(h, leaks[i]);
+		trace_hash_free(&leaks[i]->stack_hash);
+		free(leaks[i]);
+	}
+
+	free(leaks);
+	trace_hash_free(&leak_hash);
+}
+
+static int match_event(struct trace_hash_item *item, void *data)
+{
+	struct event_data *edata = edata_from_item(item);
+	int id = (int)(unsigned long)data;
+
+	return edata->id == id;
+}
+
+void trace_kmemleak_record(struct tracecmd_input *handle,
+			   struct pevent_record *record)
+{
+	struct kmemleak_handle *h;
+	struct pevent *pevent;
+	struct event_data *edata;
+	struct trace_hash_item *item;
+	unsigned long id;
+
+	if (last_handle && last_handle->handle == handle)
+		h = last_handle;
+	else {
+		for (h = handles; h; h = h->next) {
+			if (h->handle == handle)
+				break;
+		}
+		if (!h)
+			die("Handle not found?");
+		last_handle = h;
+	}
+
+	pevent = h->pevent;
+
+	if (record->missed_events)
+		handle_missed_events(h);
+
+	id = pevent_data_type(pevent, record);
+	item = trace_hash_find(&h->event_hash, trace_hash(id), match_event,
+			       (void *)id);
+	if (!item)
+		return;
+	edata = edata_from_item(item);
+	edata->handler(h, record, edata);
+}
+
+static void setup_fields(struct kmemleak_handle *h)
+{
+	struct event_format *event;
+	struct event_data *edata;
+	struct pevent *pevent = h->pevent;
+
+	edata = malloc_or_die(sizeof(*edata));
+	memset(edata, 0, sizeof(*edata));
+	event = pevent_find_event_by_name(pevent, "kmem", "kmalloc");
+	if (!event)
+		die("Can't find kmem:kmalloc event");
+	h->common_pid = pevent_find_common_field(event, "common_pid");
+	edata->id = event->id;
+	edata->hash.key = trace_hash(edata->id);
+	edata->ptr_field = pevent_find_field(event, "ptr");
+	edata->data_field = pevent_find_field(event, "bytes_alloc");
+	edata->handler = handle_kmalloc;
+	if (!edata->ptr_field || !edata->data_field)
+		die("Missing key fields");
+	trace_hash_add(&h->event_hash, &edata->hash);
+
+	edata = malloc_or_die(sizeof(*edata));
+	memset(edata, 0, sizeof(*edata));
+	event = pevent_find_event_by_name(pevent, "kmem", "kfree");
+	if (!event)
+		die("Can't find kmem:kfree event");
+	edata->id = event->id;
+	edata->hash.key = trace_hash(edata->id);
+	edata->ptr_field = pevent_find_field(event, "ptr");
+	edata->handler = handle_kfree;
+	if (!edata->ptr_field)
+		die("Missing key kfree fields");
+	trace_hash_add(&h->event_hash, &edata->hash);
+
+	edata = malloc_or_die(sizeof(*edata));
+	memset(edata, 0, sizeof(*edata));
+	event = pevent_find_event_by_name(pevent, "kmem", "kmem_cache_free");
+	if (!event)
+		die("Can't find kmem:kmem_cache_free event");
+	edata->id = event->id;
+	edata->hash.key = trace_hash(edata->id);
+	edata->ptr_field = pevent_find_field(event, "ptr");
+	edata->handler = handle_kfree;
+	if (!edata->ptr_field)
+		die("Missing key kmem_cache_free field");
+	trace_hash_add(&h->event_hash, &edata->hash);
+
+	edata = malloc_or_die(sizeof(*edata));
+	memset(edata, 0, sizeof(*edata));
+	event = pevent_find_event_by_name(pevent, "ftrace", "kernel_stack");
+	if (!event)
+		die("Can't find ftrace:kernel_stack event");
+	edata->id = event->id;
+	edata->hash.key = trace_hash(edata->id);
+	edata->data_field = pevent_find_field(event, "caller");
+	edata->handler = handle_stacktrace;
+	if (!edata->data_field)
+		die("Missing caller in stack trace");
+	trace_hash_add(&h->event_hash, &edata->hash);
+}
+
+void trace_init_kmemleak(struct tracecmd_input *handle, struct hook_list *hook,
+			 int global)
+{
+	struct pevent *pevent = tracecmd_get_pevent(handle);
+	struct kmemleak_handle *h;
+
+	tracecmd_set_show_data_func(handle, trace_kmemleak_record);
+	h = malloc_or_die(sizeof(*h));
+	memset(h, 0, sizeof(*h));
+	h->next = handles;
+	handles = h;
+
+	trace_hash_init(&h->alloc_hash, 1024);
+	trace_hash_init(&h->pid_hash, 1024);
+	trace_hash_init(&h->event_hash, 16);
+	h->handle = handle;
+	h->pevent = pevent;
+
+	setup_fields(h);
+}
+
+void trace_kmemleak_output(void)
+{
+	struct kmemleak_handle *h;
+	int leaks = 0;
+
+	printf("Printing kmemleak summary\n");
+	for (h = handles; h; h = h->next)
+		output_handle(h, &leaks);
+	if (!leaks)
+		printf("Hooray no leakage!\n");
+}
diff --git a/trace-local.h b/trace-local.h
index d9a4fac..89ad06f 100644
--- a/trace-local.h
+++ b/trace-local.h
@@ -47,6 +47,9 @@ struct pid_record_data {
 	struct pevent_record	*record;
 };
 
+typedef void (*handle_init_func)(struct tracecmd_input *handle,
+				 struct hook_list *hook, int global);
+
 void show_file(const char *name);
 
 struct tracecmd_input *read_trace_header(const char *file);
@@ -76,21 +79,23 @@ void trace_stat(int argc, char **argv);
 
 struct hook_list;
 
-int trace_profile_record(struct tracecmd_input *handle,
-			 struct pevent_record *record, int cpu);
 void trace_init_profile(struct tracecmd_input *handle, struct hook_list *hooks,
 			int global);
 int trace_profile(void);
 void trace_profile_set_merge_like_comms(void);
 
+void trace_init_kmemleak(struct tracecmd_input *handle, struct hook_list *hook,
+			 int global);
+void trace_kmemleak_global_init(void);
+void trace_kmemleak_output(void);
+
 struct tracecmd_input *
 trace_stream_init(struct buffer_instance *instance, int cpu, int fd, int cpus,
-		  int profile, struct hook_list *hooks, int global);
-int trace_stream_read(struct pid_record_data *pids, int nr_pids, struct timeval *tv,
-		      int profile);
+		  struct hook_list *hooks, handle_init_func handle_init,
+		  int global);
+int trace_stream_read(struct pid_record_data *pids, int nr_pids, struct timeval *tv);
 
-void trace_show_data(struct tracecmd_input *handle, struct pevent_record *record,
-		     int profile);
+void trace_show_data(struct tracecmd_input *handle, struct pevent_record *record);
 
 /* --- event interation --- */
 
@@ -167,6 +172,7 @@ struct buffer_instance {
 	int			keep;
 	int			buffer_size;
 	int			profile;
+	int			kmemleak;
 };
 
 extern struct buffer_instance top_instance;
diff --git a/trace-profile.c b/trace-profile.c
index 2356701..aa54f0d 100644
--- a/trace-profile.c
+++ b/trace-profile.c
@@ -698,8 +698,8 @@ find_event_data(struct handle_data *h, int id)
 	return NULL;
 }
 
-int trace_profile_record(struct tracecmd_input *handle,
-			 struct pevent_record *record, int cpu)
+static void trace_profile_record(struct tracecmd_input *handle,
+				struct pevent_record *record)
 {
 	static struct handle_data *last_handle;
 	struct pevent_record *stack_record;
@@ -708,6 +708,7 @@ int trace_profile_record(struct tracecmd_input *handle,
 	struct handle_data *h;
 	struct pevent *pevent;
 	unsigned long long pid;
+	int cpu = record->cpu;
 	int id;
 
 	if (last_handle && last_handle->handle == handle)
@@ -732,7 +733,7 @@ int trace_profile_record(struct tracecmd_input *handle,
 	event_data = find_event_data(h, id);
 
 	if (!event_data)
-		return -1;
+		return;
 
 
 	/* Get this current PID */
@@ -751,8 +752,6 @@ int trace_profile_record(struct tracecmd_input *handle,
 		free_record(stack_record);
 		task->last_stack = NULL;
 	}
-
-	return 0;
 }
 
 static struct event_data *
@@ -1225,6 +1224,7 @@ void trace_init_profile(struct tracecmd_input *handle, struct hook_list *hook,
 	int ret;
 	int i;
 
+	tracecmd_set_show_data_func(handle, trace_profile_record);
 	h = malloc_or_die(sizeof(*h));
 	memset(h, 0, sizeof(*h));
 	h->next = handles;
diff --git a/trace-read.c b/trace-read.c
index f4dffd6..103bc0c 100644
--- a/trace-read.c
+++ b/trace-read.c
@@ -737,22 +737,21 @@ static void finish_wakeup(void)
 	trace_hash_free(&wakeup_hash);
 }
 
-void trace_show_data(struct tracecmd_input *handle, struct pevent_record *record,
-		     int profile)
+void trace_show_data(struct tracecmd_input *handle, struct pevent_record *record)
 {
+	trace_show_data_func func = tracecmd_get_show_data_func(handle);
 	struct pevent *pevent;
 	struct trace_seq s;
 	int cpu = record->cpu;
 	bool use_trace_clock;
 
-	pevent = tracecmd_get_pevent(handle);
-
 	test_save(record, cpu);
 
-	if (profile) {
-		trace_profile_record(handle, record, cpu);
+	if (func) {
+		func(handle, record);
 		return;
 	}
+	pevent = tracecmd_get_pevent(handle);
 
 	trace_seq_init(&s);
 	if (record->missed_events > 0)
@@ -1109,7 +1108,7 @@ static void read_data_info(struct list_head *handle_list, enum output_type otype
 		}
 		if (last_record) {
 			print_handle_file(last_handle);
-			trace_show_data(last_handle->handle, last_record, profile);
+			trace_show_data(last_handle->handle, last_record);
 			free_handle_record(last_handle);
 		}
 	} while (last_record);
diff --git a/trace-record.c b/trace-record.c
index 102bfe1..cd36585 100644
--- a/trace-record.c
+++ b/trace-record.c
@@ -67,9 +67,10 @@ enum trace_type {
 	TRACE_TYPE_START	= (1 << 1),
 	TRACE_TYPE_STREAM	= (1 << 2),
 	TRACE_TYPE_EXTRACT	= (1 << 3),
-	TRACE_TYPE_PROFILE	= (1 << 4) | TRACE_TYPE_STREAM,
 };
 
+static handle_init_func handle_init = NULL;
+
 static int rt_prio;
 
 static int use_tcp;
@@ -489,7 +490,6 @@ static void delete_thread_data(void)
 static void stop_threads(enum trace_type type)
 {
 	struct timeval tv = { 0, 0 };
-	int profile = (type & TRACE_TYPE_PROFILE) == TRACE_TYPE_PROFILE;
 	int ret;
 	int i;
 
@@ -506,7 +506,7 @@ static void stop_threads(enum trace_type type)
 	/* Flush out the pipes */
 	if (type & TRACE_TYPE_STREAM) {
 		do {
-			ret = trace_stream_read(pids, recorder_threads, &tv, profile);
+			ret = trace_stream_read(pids, recorder_threads, &tv);
 		} while (ret > 0);
 	}
 
@@ -839,7 +839,6 @@ static pid_t trace_waitpid(enum trace_type type, pid_t pid, int *status, int opt
 {
 	struct timeval tv = { 1, 0 };
 	int ret;
-	int profile = (type & TRACE_TYPE_PROFILE) == TRACE_TYPE_PROFILE;
 
 	if (type & TRACE_TYPE_STREAM)
 		options |= WNOHANG;
@@ -850,7 +849,7 @@ static pid_t trace_waitpid(enum trace_type type, pid_t pid, int *status, int opt
 			return ret;
 
 		if (type & TRACE_TYPE_STREAM)
-			trace_stream_read(pids, recorder_threads, &tv, profile);
+			trace_stream_read(pids, recorder_threads, &tv);
 	} while (1);
 }
 #ifndef NO_PTRACE
@@ -1008,12 +1007,11 @@ static inline void ptrace_attach(int pid) { }
 static void trace_or_sleep(enum trace_type type)
 {
 	struct timeval tv = { 1 , 0 };
-	int profile = (type & TRACE_TYPE_PROFILE) == TRACE_TYPE_PROFILE;
 
 	if (do_ptrace && filter_pid >= 0)
 		ptrace_wait(type, filter_pid);
 	else if (type & TRACE_TYPE_STREAM)
-		trace_stream_read(pids, recorder_threads, &tv, profile);
+		trace_stream_read(pids, recorder_threads, &tv);
 	else
 		sleep(10);
 }
@@ -2494,7 +2492,6 @@ static void finish_network(void)
 
 static void start_threads(enum trace_type type, int global)
 {
-	int profile = (type & TRACE_TYPE_PROFILE) == TRACE_TYPE_PROFILE;
 	struct buffer_instance *instance;
 	int *brass = NULL;
 	int i = 0;
@@ -2518,7 +2515,7 @@ static void start_threads(enum trace_type type, int global)
 					die("pipe");
 				pids[i].stream = trace_stream_init(instance, x,
 								   brass[0], cpu_count,
-								   profile, hooks,
+								   hooks, handle_init,
 								   global);
 				if (!pids[i].stream)
 					die("Creating stream for %d", i);
@@ -3334,7 +3331,8 @@ static void check_function_plugin(void)
 
 static int __check_doing_something(struct buffer_instance *instance)
 {
-	return instance->profile || instance->plugin || instance->events;
+	return instance->kmemleak || instance->profile || instance->plugin ||
+		instance->events;
 }
 
 static void check_doing_something(void)
@@ -3654,6 +3652,26 @@ static void enable_profile(struct buffer_instance *instance)
 		profile_add_event(instance, events[i], 0);
 }
 
+static void enable_kmemleak(struct buffer_instance *instance)
+{
+	int stacktrace = 0, i;
+	char *events[] = {
+		"kmem:kfree",
+		"kmem:kmem_cache_free",
+		NULL,
+	};
+
+	if (test_stacktrace_trigger(instance))
+		stacktrace = 1;
+	else
+		save_option("stacktrace");
+
+	profile_add_event(instance, "kmem:kmalloc", stacktrace);
+
+	for (i = 0; events[i]; i++)
+		profile_add_event(instance, events[i], 0);
+}
+
 static struct event_list *
 create_hook_event(struct buffer_instance *instance,
 		  const char *system, const char *event)
@@ -3703,6 +3721,7 @@ static void add_hook(struct buffer_instance *instance, const char *arg)
 }
 
 enum {
+	OPT_kmemleak	= 249,
 	OPT_bycomm	= 250,
 	OPT_stderr	= 251,
 	OPT_profile	= 252,
@@ -3738,7 +3757,7 @@ void trace_record (int argc, char **argv)
 	int neg_event = 0;
 	int date = 0;
 	int manual = 0;
-
+	int kmemleak = 0;
 	int c;
 
 	init_instance(instance);
@@ -3754,8 +3773,11 @@ void trace_record (int argc, char **argv)
 	else if ((stream = strcmp(argv[1], "stream") == 0))
 		; /* do nothing */
 	else if ((profile = strcmp(argv[1], "profile") == 0)) {
+		handle_init = trace_init_profile;
+		events = 1;
+	} else if ((kmemleak = strcmp(argv[1], "kmemleak") == 0)) {
+		handle_init = trace_init_kmemleak;
 		events = 1;
-
 	} else if (strcmp(argv[1], "stop") == 0) {
 		int topt = 0;
 		for (;;) {
@@ -3873,6 +3895,7 @@ void trace_record (int argc, char **argv)
 			{"profile", no_argument, NULL, OPT_profile},
 			{"stderr", no_argument, NULL, OPT_stderr},
 			{"by-comm", no_argument, NULL, OPT_bycomm},
+			{"kmemleak", no_argument, NULL, OPT_kmemleak},
 			{"help", no_argument, NULL, '?'},
 			{NULL, 0, NULL, 0}
 		};
@@ -4002,7 +4025,7 @@ void trace_record (int argc, char **argv)
 				die("only one output file allowed");
 			output = optarg;
 
-			if (profile) {
+			if (profile || kmemleak) {
 				int fd;
 
 				/* pipe the output to this file instead of stdout */
@@ -4076,6 +4099,8 @@ void trace_record (int argc, char **argv)
 			add_instance(instance);
 			if (profile)
 				instance->profile = 1;
+			if (kmemleak)
+				instance->kmemleak = 1;
 			break;
 		case 'k':
 			keep = 1;
@@ -4093,6 +4118,7 @@ void trace_record (int argc, char **argv)
 			recorder_flags |= TRACECMD_RECORD_NOSPLICE;
 			break;
 		case OPT_profile:
+			handle_init = trace_init_profile;
 			instance->profile = 1;
 			events = 1;
 			break;
@@ -4107,6 +4133,11 @@ void trace_record (int argc, char **argv)
 		case OPT_bycomm:
 			trace_profile_set_merge_like_comms();
 			break;
+		case OPT_kmemleak:
+			handle_init = trace_init_kmemleak;
+			events = 1;
+			instance->kmemleak = 1;
+			break;
 		default:
 			usage(argv);
 		}
@@ -4131,6 +4162,8 @@ void trace_record (int argc, char **argv)
 	 */
 	if (profile && !buffer_instances)
 		top_instance.profile = 1;
+	if (kmemleak && !buffer_instances)
+		top_instance.kmemleak = 1;
 
 	/*
 	 * If top_instance doesn't have any plugins or events, then
@@ -4154,6 +4187,10 @@ void trace_record (int argc, char **argv)
 
 		if (!manual && instance->profile)
 			enable_profile(instance);
+		if (!manual && instance->kmemleak) {
+			trace_kmemleak_global_init();
+			enable_kmemleak(instance);
+		}
 
 		instance->tracing_on_init_val = read_tracing_on(instance);
 		/* Some instances may not be created yet */
@@ -4203,8 +4240,9 @@ void trace_record (int argc, char **argv)
 	else if (extract)
 		type = TRACE_TYPE_EXTRACT;
 	else if (profile)
-		/* PROFILE includes the STREAM bit */
-		type = TRACE_TYPE_PROFILE;
+		type = TRACE_TYPE_STREAM;
+	else if (kmemleak)
+		type = TRACE_TYPE_STREAM;
 	else
 		type = TRACE_TYPE_START;
 
@@ -4295,6 +4333,7 @@ void trace_record (int argc, char **argv)
 
 	if (profile)
 		trace_profile();
-
+	if (kmemleak)
+		trace_kmemleak_output();
 	exit(0);
 }
diff --git a/trace-stream.c b/trace-stream.c
index 9ebe65b..b103fda 100644
--- a/trace-stream.c
+++ b/trace-stream.c
@@ -35,7 +35,8 @@
  */
 struct tracecmd_input *
 trace_stream_init(struct buffer_instance *instance, int cpu, int fd, int cpus,
-		  int profile, struct hook_list *hooks, int global)
+		  struct hook_list *hooks, handle_init_func handle_init,
+		  int global)
 {
 	struct tracecmd_input *trace_input;
 	struct tracecmd_output *trace_output;
@@ -75,8 +76,8 @@ trace_stream_init(struct buffer_instance *instance, int cpu, int fd, int cpus,
 	if (tracecmd_read_headers(trace_input) < 0)
 		goto fail_free_input;
 
-	if (profile)
-		trace_init_profile(trace_input, hooks, global);
+	if (handle_init)
+		handle_init(trace_input, hooks, global);
 
  make_pipe:
 	/* Do not block on this pipe */
@@ -98,8 +99,7 @@ trace_stream_init(struct buffer_instance *instance, int cpu, int fd, int cpus,
 	return NULL;
 }
 
-int trace_stream_read(struct pid_record_data *pids, int nr_pids, struct timeval *tv,
-		      int profile)
+int trace_stream_read(struct pid_record_data *pids, int nr_pids, struct timeval *tv)
 {
 	struct pevent_record *record;
 	struct pid_record_data *pid;
@@ -127,7 +127,7 @@ int trace_stream_read(struct pid_record_data *pids, int nr_pids, struct timeval
 			last_pid = pid;
 	}
 	if (last_pid) {
-		trace_show_data(last_pid->instance->handle, last_pid->record, profile);
+		trace_show_data(last_pid->instance->handle, last_pid->record);
 		free_record(last_pid->record);
 		last_pid->record = NULL;
 		return 1;
diff --git a/trace-usage.c b/trace-usage.c
index bdd5727..27235e5 100644
--- a/trace-usage.c
+++ b/trace-usage.c
@@ -169,6 +169,12 @@ static struct usage_help usage_help[] = {
 		"          -H Allows users to hook two events together for timings\n"
 	},
 	{
+		"kmemleak",
+		"Streaming kmemleak detector",
+		" %s kmemleak\n"
+		"          Uses same options as record\n"
+	},
+	{
 		"hist",
 		"show a historgram of the trace.dat information",
 		" %s hist [-i file][-P] [file]"
-- 
2.1.0

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