[linux-2.6-block.git] / kernel / trace / kmemtrace.c

/*
 * 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(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(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(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(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(unsigned long call_site, const void *ptr)
{
	kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
}

static void kmemtrace_kmem_cache_free(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);
	if (err)
		return err;
	err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
	if (err)
		return err;
	err = register_trace_kmalloc_node(kmemtrace_kmalloc_node);
	if (err)
		return err;
	err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
	if (err)
		return err;
	err = register_trace_kfree(kmemtrace_kfree);
	if (err)
		return err;
	err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free);

	return err;
}

static void kmemtrace_stop_probes(void)
{
	unregister_trace_kmalloc(kmemtrace_kmalloc);
	unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
	unregister_trace_kmalloc_node(kmemtrace_kmalloc_node);
	unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
	unregister_trace_kfree(kmemtrace_kfree);
	unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
}

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_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_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_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_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 kmem_trace_alloc = {
	.type			= TRACE_KMEM_ALLOC,
	.trace			= kmemtrace_print_alloc,
	.binary			= kmemtrace_print_alloc_user,
};

static struct trace_event kmem_trace_free = {
	.type			= TRACE_KMEM_FREE,
	.trace			= kmemtrace_print_free,
	.binary			= kmemtrace_print_free_user,
};

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);
Commit	Line	Data
36994e58 FW	1	/*
	2	* Memory allocator tracing
	3	*
	4	* Copyright (C) 2008 Eduard - Gabriel Munteanu
	5	* Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
	6	* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
	7	*/
	8
c826e3cd IM	9	#include <linux/tracepoint.h>
c826e3cd IM	10	#include <linux/seq_file.h>
36994e58	11	#include <linux/debugfs.h>
c826e3cd	12	#include <linux/dcache.h>
36994e58	13	#include <linux/fs.h>
c826e3cd	14
02af61bb	15	#include <linux/kmemtrace.h>
36994e58	16
36994e58	17	#include "trace_output.h"
c826e3cd	18	#include "trace.h"
36994e58 FW	19
	20	/* Select an alternative, minimalistic output than the original one */
	21	#define TRACE_KMEM_OPT_MINIMAL 0x1
	22
	23	static struct tracer_opt kmem_opts[] = {
	24	/* Default disable the minimalistic output */
	25	{ TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
	26	{ }
	27	};
	28
	29	static struct tracer_flags kmem_tracer_flags = {
c826e3cd IM	30	.val = 0,
c826e3cd IM	31	.opts = kmem_opts
36994e58 FW	32	};
36994e58 FW	33
36994e58 FW	34	static struct trace_array *kmemtrace_array;
36994e58 FW	35
ca2b84cb EGM	36	/* Trace allocations */
	37	static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
	38	unsigned long call_site,
	39	const void *ptr,
	40	size_t bytes_req,
	41	size_t bytes_alloc,
	42	gfp_t gfp_flags,
	43	int node)
	44	{
e1112b4d	45	struct ftrace_event_call *call = &event_kmem_alloc;
ca2b84cb	46	struct trace_array *tr = kmemtrace_array;
c826e3cd IM	47	struct kmemtrace_alloc_entry *entry;
c826e3cd IM	48	struct ring_buffer_event *event;
ca2b84cb EGM	49
	50	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
	51	if (!event)
	52	return;
c826e3cd IM	53
c826e3cd IM	54	entry = ring_buffer_event_data(event);
ca2b84cb EGM	55	tracing_generic_entry_update(&entry->ent, 0, 0);
ca2b84cb EGM	56
c826e3cd IM	57	entry->ent.type = TRACE_KMEM_ALLOC;
	58	entry->type_id = type_id;
	59	entry->call_site = call_site;
	60	entry->ptr = ptr;
	61	entry->bytes_req = bytes_req;
	62	entry->bytes_alloc = bytes_alloc;
	63	entry->gfp_flags = gfp_flags;
	64	entry->node = node;
ca2b84cb	65
eb02ce01 TZ	66	if (!filter_check_discard(call, entry, tr->buffer, event))
eb02ce01 TZ	67	ring_buffer_unlock_commit(tr->buffer, event);
ca2b84cb EGM	68
	69	trace_wake_up();
	70	}
	71
	72	static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
	73	unsigned long call_site,
	74	const void *ptr)
	75	{
e1112b4d	76	struct ftrace_event_call *call = &event_kmem_free;
ca2b84cb	77	struct trace_array *tr = kmemtrace_array;
c826e3cd IM	78	struct kmemtrace_free_entry *entry;
c826e3cd IM	79	struct ring_buffer_event *event;
ca2b84cb EGM	80
	81	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
	82	if (!event)
	83	return;
	84	entry = ring_buffer_event_data(event);
	85	tracing_generic_entry_update(&entry->ent, 0, 0);
	86
c826e3cd IM	87	entry->ent.type = TRACE_KMEM_FREE;
	88	entry->type_id = type_id;
	89	entry->call_site = call_site;
	90	entry->ptr = ptr;
ca2b84cb	91
eb02ce01 TZ	92	if (!filter_check_discard(call, entry, tr->buffer, event))
eb02ce01 TZ	93	ring_buffer_unlock_commit(tr->buffer, event);
ca2b84cb EGM	94
	95	trace_wake_up();
	96	}
	97
	98	static void kmemtrace_kmalloc(unsigned long call_site,
	99	const void *ptr,
	100	size_t bytes_req,
	101	size_t bytes_alloc,
	102	gfp_t gfp_flags)
	103	{
	104	kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
	105	bytes_req, bytes_alloc, gfp_flags, -1);
	106	}
	107
	108	static void kmemtrace_kmem_cache_alloc(unsigned long call_site,
	109	const void *ptr,
	110	size_t bytes_req,
	111	size_t bytes_alloc,
	112	gfp_t gfp_flags)
	113	{
	114	kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
	115	bytes_req, bytes_alloc, gfp_flags, -1);
	116	}
	117
	118	static void kmemtrace_kmalloc_node(unsigned long call_site,
	119	const void *ptr,
	120	size_t bytes_req,
	121	size_t bytes_alloc,
	122	gfp_t gfp_flags,
	123	int node)
	124	{
	125	kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
	126	bytes_req, bytes_alloc, gfp_flags, node);
	127	}
	128
	129	static void kmemtrace_kmem_cache_alloc_node(unsigned long call_site,
	130	const void *ptr,
	131	size_t bytes_req,
	132	size_t bytes_alloc,
	133	gfp_t gfp_flags,
	134	int node)
	135	{
	136	kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
	137	bytes_req, bytes_alloc, gfp_flags, node);
	138	}
	139
	140	static void kmemtrace_kfree(unsigned long call_site, const void *ptr)
	141	{
	142	kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
	143	}
	144
	145	static void kmemtrace_kmem_cache_free(unsigned long call_site, const void *ptr)
	146	{
	147	kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
	148	}
	149
	150	static int kmemtrace_start_probes(void)
	151	{
	152	int err;
	153
	154	err = register_trace_kmalloc(kmemtrace_kmalloc);
	155	if (err)
	156	return err;
	157	err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
158	if (err)
159	return err;
160	err = register_trace_kmalloc_node(kmemtrace_kmalloc_node);
161	if (err)
162	return err;
163	err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
164	if (err)
165	return err;
166	err = register_trace_kfree(kmemtrace_kfree);
167	if (err)
168	return err;
169	err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
170
171	return err;
172	}
173
174	static void kmemtrace_stop_probes(void)
175	{
176	unregister_trace_kmalloc(kmemtrace_kmalloc);
177	unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
178	unregister_trace_kmalloc_node(kmemtrace_kmalloc_node);
179	unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
180	unregister_trace_kfree(kmemtrace_kfree);
181	unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
182	}
183
36994e58 FW	184	static int kmem_trace_init(struct trace_array *tr)
36994e58 FW	185	{
36994e58 FW	186	kmemtrace_array = tr;
36994e58 FW	187
76f0d073	188	tracing_reset_online_cpus(tr);
36994e58	189
ca2b84cb	190	kmemtrace_start_probes();
36994e58 FW	191
	192	return 0;
	193	}
	194
	195	static void kmem_trace_reset(struct trace_array *tr)
	196	{
ca2b84cb	197	kmemtrace_stop_probes();
36994e58 FW	198	}
	199
	200	static void kmemtrace_headers(struct seq_file *s)
	201	{
	202	/* Don't need headers for the original kmemtrace output */
	203	if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
	204	return;
	205
	206	seq_printf(s, "#\n");
	207	seq_printf(s, "# ALLOC TYPE REQ GIVEN FLAGS "
	208	" POINTER NODE CALLER\n");
	209	seq_printf(s, "# FREE \| \| \| \| "
	210	" \| \| \| \|\n");
	211	seq_printf(s, "# \|\n\n");
	212	}
	213
	214	/*
42af9054 EGM	215	* The following functions give the original output from kmemtrace,
42af9054 EGM	216	* plus the origin CPU, since reordering occurs in-kernel now.
36994e58	217	*/
42af9054 EGM	218
	219	#define KMEMTRACE_USER_ALLOC 0
	220	#define KMEMTRACE_USER_FREE 1
	221
	222	struct kmemtrace_user_event {
c826e3cd IM	223	u8 event_id;
	224	u8 type_id;
	225	u16 event_size;
	226	u32 cpu;
	227	u64 timestamp;
	228	unsigned long call_site;
	229	unsigned long ptr;
42af9054 EGM	230	};
	231
	232	struct kmemtrace_user_event_alloc {
c826e3cd IM	233	size_t bytes_req;
	234	size_t bytes_alloc;
	235	unsigned gfp_flags;
	236	int node;
42af9054 EGM	237	};
42af9054 EGM	238
36994e58	239	static enum print_line_t
80098c20	240	kmemtrace_print_alloc(struct trace_iterator *iter, int flags)
ddc1637a LZ	241	{
	242	struct trace_seq *s = &iter->seq;
	243	struct kmemtrace_alloc_entry *entry;
	244	int ret;
	245
	246	trace_assign_type(entry, iter->ent);
	247
	248	ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu "
	249	"bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
	250	entry->type_id, (void *)entry->call_site, (unsigned long)entry->ptr,
	251	(unsigned long)entry->bytes_req, (unsigned long)entry->bytes_alloc,
	252	(unsigned long)entry->gfp_flags, entry->node);
	253
	254	if (!ret)
	255	return TRACE_TYPE_PARTIAL_LINE;
	256	return TRACE_TYPE_HANDLED;
	257	}
	258
	259	static enum print_line_t
80098c20	260	kmemtrace_print_free(struct trace_iterator *iter, int flags)
36994e58 FW	261	{
36994e58 FW	262	struct trace_seq *s = &iter->seq;
ddc1637a LZ	263	struct kmemtrace_free_entry *entry;
	264	int ret;
	265
	266	trace_assign_type(entry, iter->ent);
	267
	268	ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu\n",
	269	entry->type_id, (void *)entry->call_site,
	270	(unsigned long)entry->ptr);
	271
	272	if (!ret)
	273	return TRACE_TYPE_PARTIAL_LINE;
	274	return TRACE_TYPE_HANDLED;
	275	}
	276
	277	static enum print_line_t
80098c20	278	kmemtrace_print_alloc_user(struct trace_iterator *iter, int flags)
ddc1637a LZ	279	{
	280	struct trace_seq *s = &iter->seq;
	281	struct kmemtrace_alloc_entry *entry;
42af9054	282	struct kmemtrace_user_event *ev;
ddc1637a LZ	283	struct kmemtrace_user_event_alloc *ev_alloc;
	284
	285	trace_assign_type(entry, iter->ent);
36994e58	286
42af9054 EGM	287	ev = trace_seq_reserve(s, sizeof(*ev));
	288	if (!ev)
	289	return TRACE_TYPE_PARTIAL_LINE;
c826e3cd IM	290
	291	ev->event_id = KMEMTRACE_USER_ALLOC;
	292	ev->type_id = entry->type_id;
	293	ev->event_size = sizeof(ev) + sizeof(ev_alloc);
	294	ev->cpu = iter->cpu;
	295	ev->timestamp = iter->ts;
	296	ev->call_site = entry->call_site;
	297	ev->ptr = (unsigned long)entry->ptr;
42af9054 EGM	298
	299	ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
	300	if (!ev_alloc)
36994e58	301	return TRACE_TYPE_PARTIAL_LINE;
c826e3cd IM	302
	303	ev_alloc->bytes_req = entry->bytes_req;
	304	ev_alloc->bytes_alloc = entry->bytes_alloc;
	305	ev_alloc->gfp_flags = entry->gfp_flags;
	306	ev_alloc->node = entry->node;
36994e58 FW	307
	308	return TRACE_TYPE_HANDLED;
	309	}
	310
	311	static enum print_line_t
80098c20	312	kmemtrace_print_free_user(struct trace_iterator *iter, int flags)
36994e58 FW	313	{
36994e58 FW	314	struct trace_seq *s = &iter->seq;
ddc1637a	315	struct kmemtrace_free_entry *entry;
42af9054	316	struct kmemtrace_user_event *ev;
36994e58	317
ddc1637a LZ	318	trace_assign_type(entry, iter->ent);
ddc1637a LZ	319
42af9054 EGM	320	ev = trace_seq_reserve(s, sizeof(*ev));
42af9054 EGM	321	if (!ev)
36994e58	322	return TRACE_TYPE_PARTIAL_LINE;
c826e3cd IM	323
	324	ev->event_id = KMEMTRACE_USER_FREE;
	325	ev->type_id = entry->type_id;
	326	ev->event_size = sizeof(*ev);
	327	ev->cpu = iter->cpu;
	328	ev->timestamp = iter->ts;
	329	ev->call_site = entry->call_site;
	330	ev->ptr = (unsigned long)entry->ptr;
36994e58 FW	331
	332	return TRACE_TYPE_HANDLED;
	333	}
	334
36994e58 FW	335	/* The two other following provide a more minimalistic output */
36994e58 FW	336	static enum print_line_t
ddc1637a	337	kmemtrace_print_alloc_compress(struct trace_iterator *iter)
36994e58	338	{
ddc1637a	339	struct kmemtrace_alloc_entry *entry;
36994e58 FW	340	struct trace_seq *s = &iter->seq;
	341	int ret;
	342
ddc1637a LZ	343	trace_assign_type(entry, iter->ent);
ddc1637a LZ	344
36994e58 FW	345	/* Alloc entry */
	346	ret = trace_seq_printf(s, " + ");
	347	if (!ret)
	348	return TRACE_TYPE_PARTIAL_LINE;
	349
	350	/* Type */
	351	switch (entry->type_id) {
	352	case KMEMTRACE_TYPE_KMALLOC:
	353	ret = trace_seq_printf(s, "K ");
	354	break;
	355	case KMEMTRACE_TYPE_CACHE:
	356	ret = trace_seq_printf(s, "C ");
	357	break;
	358	case KMEMTRACE_TYPE_PAGES:
	359	ret = trace_seq_printf(s, "P ");
	360	break;
	361	default:
	362	ret = trace_seq_printf(s, "? ");
	363	}
	364
	365	if (!ret)
	366	return TRACE_TYPE_PARTIAL_LINE;
	367
	368	/* Requested */
ecf441b5	369	ret = trace_seq_printf(s, "%4zu ", entry->bytes_req);
36994e58 FW	370	if (!ret)
	371	return TRACE_TYPE_PARTIAL_LINE;
	372
	373	/* Allocated */
ecf441b5	374	ret = trace_seq_printf(s, "%4zu ", entry->bytes_alloc);
36994e58 FW	375	if (!ret)
	376	return TRACE_TYPE_PARTIAL_LINE;
	377
	378	/* Flags
	379	* TODO: would be better to see the name of the GFP flag names
	380	*/
	381	ret = trace_seq_printf(s, "%08x ", entry->gfp_flags);
	382	if (!ret)
	383	return TRACE_TYPE_PARTIAL_LINE;
	384
	385	/* Pointer to allocated */
	386	ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
	387	if (!ret)
	388	return TRACE_TYPE_PARTIAL_LINE;
	389
6a167c65 FW	390	/* Node and call site*/
	391	ret = trace_seq_printf(s, "%4d %pf\n", entry->node,
	392	(void *)entry->call_site);
36994e58 FW	393	if (!ret)
	394	return TRACE_TYPE_PARTIAL_LINE;
	395
36994e58 FW	396	return TRACE_TYPE_HANDLED;
	397	}
	398
	399	static enum print_line_t
ddc1637a	400	kmemtrace_print_free_compress(struct trace_iterator *iter)
36994e58	401	{
ddc1637a	402	struct kmemtrace_free_entry *entry;
36994e58 FW	403	struct trace_seq *s = &iter->seq;
	404	int ret;
	405
ddc1637a LZ	406	trace_assign_type(entry, iter->ent);
ddc1637a LZ	407
36994e58 FW	408	/* Free entry */
	409	ret = trace_seq_printf(s, " - ");
	410	if (!ret)
	411	return TRACE_TYPE_PARTIAL_LINE;
	412
	413	/* Type */
	414	switch (entry->type_id) {
	415	case KMEMTRACE_TYPE_KMALLOC:
	416	ret = trace_seq_printf(s, "K ");
	417	break;
	418	case KMEMTRACE_TYPE_CACHE:
	419	ret = trace_seq_printf(s, "C ");
	420	break;
	421	case KMEMTRACE_TYPE_PAGES:
	422	ret = trace_seq_printf(s, "P ");
	423	break;
	424	default:
	425	ret = trace_seq_printf(s, "? ");
	426	}
	427
	428	if (!ret)
	429	return TRACE_TYPE_PARTIAL_LINE;
	430
	431	/* Skip requested/allocated/flags */
	432	ret = trace_seq_printf(s, " ");
	433	if (!ret)
	434	return TRACE_TYPE_PARTIAL_LINE;
	435
	436	/* Pointer to allocated */
	437	ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
	438	if (!ret)
	439	return TRACE_TYPE_PARTIAL_LINE;
	440
6a167c65 FW	441	/* Skip node and print call site*/
6a167c65 FW	442	ret = trace_seq_printf(s, " %pf\n", (void *)entry->call_site);
36994e58 FW	443	if (!ret)
	444	return TRACE_TYPE_PARTIAL_LINE;
	445
36994e58 FW	446	return TRACE_TYPE_HANDLED;
	447	}
	448
	449	static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
	450	{
	451	struct trace_entry *entry = iter->ent;
	452
ddc1637a LZ	453	if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
ddc1637a LZ	454	return TRACE_TYPE_UNHANDLED;
36994e58	455
ddc1637a LZ	456	switch (entry->type) {
	457	case TRACE_KMEM_ALLOC:
	458	return kmemtrace_print_alloc_compress(iter);
	459	case TRACE_KMEM_FREE:
	460	return kmemtrace_print_free_compress(iter);
36994e58 FW	461	default:
	462	return TRACE_TYPE_UNHANDLED;
	463	}
	464	}
	465
ddc1637a LZ	466	static struct trace_event kmem_trace_alloc = {
ddc1637a LZ	467	.type = TRACE_KMEM_ALLOC,
80098c20 LZ	468	.trace = kmemtrace_print_alloc,
80098c20 LZ	469	.binary = kmemtrace_print_alloc_user,
ddc1637a LZ	470	};
	471
	472	static struct trace_event kmem_trace_free = {
	473	.type = TRACE_KMEM_FREE,
80098c20 LZ	474	.trace = kmemtrace_print_free,
80098c20 LZ	475	.binary = kmemtrace_print_free_user,
ddc1637a LZ	476	};
ddc1637a LZ	477
36994e58	478	static struct tracer kmem_tracer __read_mostly = {
c826e3cd IM	479	.name = "kmemtrace",
	480	.init = kmem_trace_init,
	481	.reset = kmem_trace_reset,
	482	.print_line = kmemtrace_print_line,
	483	.print_header = kmemtrace_headers,
	484	.flags = &kmem_tracer_flags
36994e58 FW	485	};
36994e58 FW	486
3e806802 IM	487	void kmemtrace_init(void)
	488	{
	489	/* earliest opportunity to start kmem tracing */
	490	}
	491
36994e58 FW	492	static int __init init_kmem_tracer(void)
36994e58 FW	493	{
ddc1637a LZ	494	if (!register_ftrace_event(&kmem_trace_alloc)) {
	495	pr_warning("Warning: could not register kmem events\n");
	496	return 1;
	497	}
	498
	499	if (!register_ftrace_event(&kmem_trace_free)) {
	500	pr_warning("Warning: could not register kmem events\n");
	501	return 1;
	502	}
	503
f9ac5a69	504	if (register_tracer(&kmem_tracer) != 0) {
ddc1637a LZ	505	pr_warning("Warning: could not register the kmem tracer\n");
	506	return 1;
	507	}
	508
	509	return 0;
36994e58	510	}
36994e58	511	device_initcall(init_kmem_tracer);