[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)
{
	int cpu;
	kmemtrace_array = tr;

	for_each_cpu_mask(cpu, cpu_possible_map)
		tracing_reset(tr, cpu);

	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_user(struct trace_iterator *iter,
			   struct kmemtrace_alloc_entry *entry)
{
	struct kmemtrace_user_event_alloc *ev_alloc;
	struct trace_seq *s = &iter->seq;
	struct kmemtrace_user_event *ev;

	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,
			  struct kmemtrace_free_entry *entry)
{
	struct trace_seq *s = &iter->seq;
	struct kmemtrace_user_event *ev;

	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;

	/* 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 */
	ret = trace_seq_printf(s, "%4d   ", entry->node);
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	/* Call site */
	ret = seq_print_ip_sym(s, entry->call_site, 0);
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	if (!trace_seq_printf(s, "\n"))
		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;

	/* 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 */
	ret = trace_seq_printf(s, "       ");
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	/* Call site */
	ret = seq_print_ip_sym(s, entry->call_site, 0);
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	if (!trace_seq_printf(s, "\n"))
		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;

	switch (entry->type) {
	case TRACE_KMEM_ALLOC: {
		struct kmemtrace_alloc_entry *field;

		trace_assign_type(field, entry);
		if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
			return kmemtrace_print_alloc_compress(iter, field);
		else
			return kmemtrace_print_alloc_user(iter, field);
	}

	case TRACE_KMEM_FREE: {
		struct kmemtrace_free_entry *field;

		trace_assign_type(field, entry);
		if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
			return kmemtrace_print_free_compress(iter, field);
		else
			return kmemtrace_print_free_user(iter, field);
	}

	default:
		return TRACE_TYPE_UNHANDLED;
	}
}

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)
{
	return register_tracer(&kmem_tracer);
}
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)
	185	{
	186	int cpu;
	187	kmemtrace_array = tr;
	188
	189	for_each_cpu_mask(cpu, cpu_possible_map)
	190	tracing_reset(tr, cpu);
	191
ca2b84cb	192	kmemtrace_start_probes();
36994e58 FW	193
	194	return 0;
	195	}
	196
	197	static void kmem_trace_reset(struct trace_array *tr)
	198	{
ca2b84cb	199	kmemtrace_stop_probes();
36994e58 FW	200	}
	201
	202	static void kmemtrace_headers(struct seq_file *s)
	203	{
	204	/* Don't need headers for the original kmemtrace output */
	205	if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
	206	return;
	207
	208	seq_printf(s, "#\n");
	209	seq_printf(s, "# ALLOC TYPE REQ GIVEN FLAGS "
	210	" POINTER NODE CALLER\n");
	211	seq_printf(s, "# FREE \| \| \| \| "
	212	" \| \| \| \|\n");
	213	seq_printf(s, "# \|\n\n");
	214	}
	215
	216	/*
42af9054 EGM	217	* The following functions give the original output from kmemtrace,
42af9054 EGM	218	* plus the origin CPU, since reordering occurs in-kernel now.
36994e58	219	*/
42af9054 EGM	220
	221	#define KMEMTRACE_USER_ALLOC 0
	222	#define KMEMTRACE_USER_FREE 1
	223
	224	struct kmemtrace_user_event {
c826e3cd IM	225	u8 event_id;
	226	u8 type_id;
	227	u16 event_size;
	228	u32 cpu;
	229	u64 timestamp;
	230	unsigned long call_site;
	231	unsigned long ptr;
42af9054 EGM	232	};
	233
	234	struct kmemtrace_user_event_alloc {
c826e3cd IM	235	size_t bytes_req;
	236	size_t bytes_alloc;
	237	unsigned gfp_flags;
	238	int node;
42af9054 EGM	239	};
42af9054 EGM	240
36994e58	241	static enum print_line_t
42af9054 EGM	242	kmemtrace_print_alloc_user(struct trace_iterator *iter,
42af9054 EGM	243	struct kmemtrace_alloc_entry *entry)
36994e58	244	{
c826e3cd	245	struct kmemtrace_user_event_alloc *ev_alloc;
36994e58	246	struct trace_seq *s = &iter->seq;
42af9054	247	struct kmemtrace_user_event *ev;
36994e58	248
42af9054 EGM	249	ev = trace_seq_reserve(s, sizeof(*ev));
	250	if (!ev)
	251	return TRACE_TYPE_PARTIAL_LINE;
c826e3cd IM	252
	253	ev->event_id = KMEMTRACE_USER_ALLOC;
	254	ev->type_id = entry->type_id;
	255	ev->event_size = sizeof(ev) + sizeof(ev_alloc);
	256	ev->cpu = iter->cpu;
	257	ev->timestamp = iter->ts;
	258	ev->call_site = entry->call_site;
	259	ev->ptr = (unsigned long)entry->ptr;
42af9054 EGM	260
	261	ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
	262	if (!ev_alloc)
36994e58	263	return TRACE_TYPE_PARTIAL_LINE;
c826e3cd IM	264
	265	ev_alloc->bytes_req = entry->bytes_req;
	266	ev_alloc->bytes_alloc = entry->bytes_alloc;
	267	ev_alloc->gfp_flags = entry->gfp_flags;
	268	ev_alloc->node = entry->node;
36994e58 FW	269
	270	return TRACE_TYPE_HANDLED;
	271	}
	272
	273	static enum print_line_t
42af9054 EGM	274	kmemtrace_print_free_user(struct trace_iterator *iter,
42af9054 EGM	275	struct kmemtrace_free_entry *entry)
36994e58 FW	276	{
36994e58 FW	277	struct trace_seq *s = &iter->seq;
42af9054	278	struct kmemtrace_user_event *ev;
36994e58	279
42af9054 EGM	280	ev = trace_seq_reserve(s, sizeof(*ev));
42af9054 EGM	281	if (!ev)
36994e58	282	return TRACE_TYPE_PARTIAL_LINE;
c826e3cd IM	283
	284	ev->event_id = KMEMTRACE_USER_FREE;
	285	ev->type_id = entry->type_id;
	286	ev->event_size = sizeof(*ev);
	287	ev->cpu = iter->cpu;
	288	ev->timestamp = iter->ts;
	289	ev->call_site = entry->call_site;
	290	ev->ptr = (unsigned long)entry->ptr;
36994e58 FW	291
	292	return TRACE_TYPE_HANDLED;
	293	}
	294
36994e58 FW	295	/* The two other following provide a more minimalistic output */
	296	static enum print_line_t
	297	kmemtrace_print_alloc_compress(struct trace_iterator *iter,
	298	struct kmemtrace_alloc_entry *entry)
	299	{
	300	struct trace_seq *s = &iter->seq;
	301	int ret;
	302
	303	/* Alloc entry */
	304	ret = trace_seq_printf(s, " + ");
	305	if (!ret)
	306	return TRACE_TYPE_PARTIAL_LINE;
	307
	308	/* Type */
	309	switch (entry->type_id) {
	310	case KMEMTRACE_TYPE_KMALLOC:
	311	ret = trace_seq_printf(s, "K ");
	312	break;
	313	case KMEMTRACE_TYPE_CACHE:
	314	ret = trace_seq_printf(s, "C ");
	315	break;
	316	case KMEMTRACE_TYPE_PAGES:
	317	ret = trace_seq_printf(s, "P ");
	318	break;
	319	default:
	320	ret = trace_seq_printf(s, "? ");
	321	}
	322
	323	if (!ret)
	324	return TRACE_TYPE_PARTIAL_LINE;
	325
	326	/* Requested */
ecf441b5	327	ret = trace_seq_printf(s, "%4zu ", entry->bytes_req);
36994e58 FW	328	if (!ret)
	329	return TRACE_TYPE_PARTIAL_LINE;
	330
	331	/* Allocated */
ecf441b5	332	ret = trace_seq_printf(s, "%4zu ", entry->bytes_alloc);
36994e58 FW	333	if (!ret)
	334	return TRACE_TYPE_PARTIAL_LINE;
	335
	336	/* Flags
	337	* TODO: would be better to see the name of the GFP flag names
	338	*/
	339	ret = trace_seq_printf(s, "%08x ", entry->gfp_flags);
	340	if (!ret)
	341	return TRACE_TYPE_PARTIAL_LINE;
	342
	343	/* Pointer to allocated */
	344	ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
	345	if (!ret)
	346	return TRACE_TYPE_PARTIAL_LINE;
	347
	348	/* Node */
	349	ret = trace_seq_printf(s, "%4d ", entry->node);
	350	if (!ret)
	351	return TRACE_TYPE_PARTIAL_LINE;
	352
	353	/* Call site */
	354	ret = seq_print_ip_sym(s, entry->call_site, 0);
	355	if (!ret)
	356	return TRACE_TYPE_PARTIAL_LINE;
	357
	358	if (!trace_seq_printf(s, "\n"))
	359	return TRACE_TYPE_PARTIAL_LINE;
	360
	361	return TRACE_TYPE_HANDLED;
	362	}
	363
	364	static enum print_line_t
	365	kmemtrace_print_free_compress(struct trace_iterator *iter,
c826e3cd	366	struct kmemtrace_free_entry *entry)
36994e58 FW	367	{
	368	struct trace_seq *s = &iter->seq;
	369	int ret;
	370
	371	/* Free entry */
	372	ret = trace_seq_printf(s, " - ");
	373	if (!ret)
	374	return TRACE_TYPE_PARTIAL_LINE;
	375
	376	/* Type */
	377	switch (entry->type_id) {
	378	case KMEMTRACE_TYPE_KMALLOC:
	379	ret = trace_seq_printf(s, "K ");
	380	break;
	381	case KMEMTRACE_TYPE_CACHE:
	382	ret = trace_seq_printf(s, "C ");
	383	break;
	384	case KMEMTRACE_TYPE_PAGES:
	385	ret = trace_seq_printf(s, "P ");
	386	break;
	387	default:
	388	ret = trace_seq_printf(s, "? ");
	389	}
	390
	391	if (!ret)
	392	return TRACE_TYPE_PARTIAL_LINE;
	393
	394	/* Skip requested/allocated/flags */
	395	ret = trace_seq_printf(s, " ");
	396	if (!ret)
	397	return TRACE_TYPE_PARTIAL_LINE;
	398
	399	/* Pointer to allocated */
	400	ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
	401	if (!ret)
	402	return TRACE_TYPE_PARTIAL_LINE;
	403
	404	/* Skip node */
	405	ret = trace_seq_printf(s, " ");
	406	if (!ret)
	407	return TRACE_TYPE_PARTIAL_LINE;
	408
	409	/* Call site */
	410	ret = seq_print_ip_sym(s, entry->call_site, 0);
	411	if (!ret)
	412	return TRACE_TYPE_PARTIAL_LINE;
	413
	414	if (!trace_seq_printf(s, "\n"))
	415	return TRACE_TYPE_PARTIAL_LINE;
	416
	417	return TRACE_TYPE_HANDLED;
	418	}
	419
	420	static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
	421	{
	422	struct trace_entry *entry = iter->ent;
	423
	424	switch (entry->type) {
	425	case TRACE_KMEM_ALLOC: {
	426	struct kmemtrace_alloc_entry *field;
c826e3cd	427
36994e58 FW	428	trace_assign_type(field, entry);
	429	if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
	430	return kmemtrace_print_alloc_compress(iter, field);
	431	else
42af9054	432	return kmemtrace_print_alloc_user(iter, field);
36994e58 FW	433	}
	434
	435	case TRACE_KMEM_FREE: {
	436	struct kmemtrace_free_entry *field;
c826e3cd	437
36994e58 FW	438	trace_assign_type(field, entry);
	439	if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
	440	return kmemtrace_print_free_compress(iter, field);
	441	else
42af9054	442	return kmemtrace_print_free_user(iter, field);
36994e58 FW	443	}
	444
	445	default:
	446	return TRACE_TYPE_UNHANDLED;
	447	}
	448	}
	449
36994e58	450	static struct tracer kmem_tracer __read_mostly = {
c826e3cd IM	451	.name = "kmemtrace",
	452	.init = kmem_trace_init,
	453	.reset = kmem_trace_reset,
	454	.print_line = kmemtrace_print_line,
	455	.print_header = kmemtrace_headers,
	456	.flags = &kmem_tracer_flags
36994e58 FW	457	};
36994e58 FW	458
3e806802 IM	459	void kmemtrace_init(void)
	460	{
	461	/* earliest opportunity to start kmem tracing */
	462	}
	463
36994e58 FW	464	static int __init init_kmem_tracer(void)
	465	{
	466	return register_tracer(&kmem_tracer);
	467	}
36994e58	468	device_initcall(init_kmem_tracer);