[linux.git] / kernel / profile.c

/*
 *  linux/kernel/profile.c
 *  Simple profiling. Manages a direct-mapped profile hit count buffer,
 *  with configurable resolution, support for restricting the cpus on
 *  which profiling is done, and switching between cpu time and
 *  schedule() calls via kernel command line parameters passed at boot.
 *
 *  Scheduler profiling support, Arjan van de Ven and Ingo Molnar,
 *	Red Hat, July 2004
 *  Consolidation of architecture support code for profiling,
 *	Nadia Yvette Chambers, Oracle, July 2004
 *  Amortized hit count accounting via per-cpu open-addressed hashtables
 *	to resolve timer interrupt livelocks, Nadia Yvette Chambers,
 *	Oracle, 2004
 */

#include <linux/export.h>
#include <linux/profile.h>
#include <linux/bootmem.h>
#include <linux/notifier.h>
#include <linux/mm.h>
#include <linux/cpumask.h>
#include <linux/cpu.h>
#include <linux/highmem.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <asm/sections.h>
#include <asm/irq_regs.h>
#include <asm/ptrace.h>

struct profile_hit {
	u32 pc, hits;
};
#define PROFILE_GRPSHIFT	3
#define PROFILE_GRPSZ		(1 << PROFILE_GRPSHIFT)
#define NR_PROFILE_HIT		(PAGE_SIZE/sizeof(struct profile_hit))
#define NR_PROFILE_GRP		(NR_PROFILE_HIT/PROFILE_GRPSZ)

static atomic_t *prof_buffer;
static unsigned long prof_len, prof_shift;

int prof_on __read_mostly;
EXPORT_SYMBOL_GPL(prof_on);

static cpumask_var_t prof_cpu_mask;
#ifdef CONFIG_SMP
static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits);
static DEFINE_PER_CPU(int, cpu_profile_flip);
static DEFINE_MUTEX(profile_flip_mutex);
#endif /* CONFIG_SMP */

int profile_setup(char *str)
{
	static const char schedstr[] = "schedule";
	static const char sleepstr[] = "sleep";
	static const char kvmstr[] = "kvm";
	int par;

	if (!strncmp(str, sleepstr, strlen(sleepstr))) {
#ifdef CONFIG_SCHEDSTATS
		prof_on = SLEEP_PROFILING;
		if (str[strlen(sleepstr)] == ',')
			str += strlen(sleepstr) + 1;
		if (get_option(&str, &par))
			prof_shift = par;
		pr_info("kernel sleep profiling enabled (shift: %ld)\n",
			prof_shift);
#else
		pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
#endif /* CONFIG_SCHEDSTATS */
	} else if (!strncmp(str, schedstr, strlen(schedstr))) {
		prof_on = SCHED_PROFILING;
		if (str[strlen(schedstr)] == ',')
			str += strlen(schedstr) + 1;
		if (get_option(&str, &par))
			prof_shift = par;
		pr_info("kernel schedule profiling enabled (shift: %ld)\n",
			prof_shift);
	} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
		prof_on = KVM_PROFILING;
		if (str[strlen(kvmstr)] == ',')
			str += strlen(kvmstr) + 1;
		if (get_option(&str, &par))
			prof_shift = par;
		pr_info("kernel KVM profiling enabled (shift: %ld)\n",
			prof_shift);
	} else if (get_option(&str, &par)) {
		prof_shift = par;
		prof_on = CPU_PROFILING;
		pr_info("kernel profiling enabled (shift: %ld)\n",
			prof_shift);
	}
	return 1;
}
__setup("profile=", profile_setup);


int __ref profile_init(void)
{
	int buffer_bytes;
	if (!prof_on)
		return 0;

	/* only text is profiled */
	prof_len = (_etext - _stext) >> prof_shift;
	buffer_bytes = prof_len*sizeof(atomic_t);

	if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
		return -ENOMEM;

	cpumask_copy(prof_cpu_mask, cpu_possible_mask);

	prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL|__GFP_NOWARN);
	if (prof_buffer)
		return 0;

	prof_buffer = alloc_pages_exact(buffer_bytes,
					GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN);
	if (prof_buffer)
		return 0;

	prof_buffer = vzalloc(buffer_bytes);
	if (prof_buffer)
		return 0;

	free_cpumask_var(prof_cpu_mask);
	return -ENOMEM;
}

/* Profile event notifications */

static BLOCKING_NOTIFIER_HEAD(task_exit_notifier);
static ATOMIC_NOTIFIER_HEAD(task_free_notifier);
static BLOCKING_NOTIFIER_HEAD(munmap_notifier);

void profile_task_exit(struct task_struct *task)
{
	blocking_notifier_call_chain(&task_exit_notifier, 0, task);
}

int profile_handoff_task(struct task_struct *task)
{
	int ret;
	ret = atomic_notifier_call_chain(&task_free_notifier, 0, task);
	return (ret == NOTIFY_OK) ? 1 : 0;
}

void profile_munmap(unsigned long addr)
{
	blocking_notifier_call_chain(&munmap_notifier, 0, (void *)addr);
}

int task_handoff_register(struct notifier_block *n)
{
	return atomic_notifier_chain_register(&task_free_notifier, n);
}
EXPORT_SYMBOL_GPL(task_handoff_register);

int task_handoff_unregister(struct notifier_block *n)
{
	return atomic_notifier_chain_unregister(&task_free_notifier, n);
}
EXPORT_SYMBOL_GPL(task_handoff_unregister);

int profile_event_register(enum profile_type type, struct notifier_block *n)
{
	int err = -EINVAL;

	switch (type) {
	case PROFILE_TASK_EXIT:
		err = blocking_notifier_chain_register(
				&task_exit_notifier, n);
		break;
	case PROFILE_MUNMAP:
		err = blocking_notifier_chain_register(
				&munmap_notifier, n);
		break;
	}

	return err;
}
EXPORT_SYMBOL_GPL(profile_event_register);

int profile_event_unregister(enum profile_type type, struct notifier_block *n)
{
	int err = -EINVAL;

	switch (type) {
	case PROFILE_TASK_EXIT:
		err = blocking_notifier_chain_unregister(
				&task_exit_notifier, n);
		break;
	case PROFILE_MUNMAP:
		err = blocking_notifier_chain_unregister(
				&munmap_notifier, n);
		break;
	}

	return err;
}
EXPORT_SYMBOL_GPL(profile_event_unregister);

#ifdef CONFIG_SMP
/*
 * Each cpu has a pair of open-addressed hashtables for pending
 * profile hits. read_profile() IPI's all cpus to request them
 * to flip buffers and flushes their contents to prof_buffer itself.
 * Flip requests are serialized by the profile_flip_mutex. The sole
 * use of having a second hashtable is for avoiding cacheline
 * contention that would otherwise happen during flushes of pending
 * profile hits required for the accuracy of reported profile hits
 * and so resurrect the interrupt livelock issue.
 *
 * The open-addressed hashtables are indexed by profile buffer slot
 * and hold the number of pending hits to that profile buffer slot on
 * a cpu in an entry. When the hashtable overflows, all pending hits
 * are accounted to their corresponding profile buffer slots with
 * atomic_add() and the hashtable emptied. As numerous pending hits
 * may be accounted to a profile buffer slot in a hashtable entry,
 * this amortizes a number of atomic profile buffer increments likely
 * to be far larger than the number of entries in the hashtable,
 * particularly given that the number of distinct profile buffer
 * positions to which hits are accounted during short intervals (e.g.
 * several seconds) is usually very small. Exclusion from buffer
 * flipping is provided by interrupt disablement (note that for
 * SCHED_PROFILING or SLEEP_PROFILING profile_hit() may be called from
 * process context).
 * The hash function is meant to be lightweight as opposed to strong,
 * and was vaguely inspired by ppc64 firmware-supported inverted
 * pagetable hash functions, but uses a full hashtable full of finite
 * collision chains, not just pairs of them.
 *
 * -- nyc
 */
static void __profile_flip_buffers(void *unused)
{
	int cpu = smp_processor_id();

	per_cpu(cpu_profile_flip, cpu) = !per_cpu(cpu_profile_flip, cpu);
}

static void profile_flip_buffers(void)
{
	int i, j, cpu;

	mutex_lock(&profile_flip_mutex);
	j = per_cpu(cpu_profile_flip, get_cpu());
	put_cpu();
	on_each_cpu(__profile_flip_buffers, NULL, 1);
	for_each_online_cpu(cpu) {
		struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[j];
		for (i = 0; i < NR_PROFILE_HIT; ++i) {
			if (!hits[i].hits) {
				if (hits[i].pc)
					hits[i].pc = 0;
				continue;
			}
			atomic_add(hits[i].hits, &prof_buffer[hits[i].pc]);
			hits[i].hits = hits[i].pc = 0;
		}
	}
	mutex_unlock(&profile_flip_mutex);
}

static void profile_discard_flip_buffers(void)
{
	int i, cpu;

	mutex_lock(&profile_flip_mutex);
	i = per_cpu(cpu_profile_flip, get_cpu());
	put_cpu();
	on_each_cpu(__profile_flip_buffers, NULL, 1);
	for_each_online_cpu(cpu) {
		struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[i];
		memset(hits, 0, NR_PROFILE_HIT*sizeof(struct profile_hit));
	}
	mutex_unlock(&profile_flip_mutex);
}

static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
{
	unsigned long primary, secondary, flags, pc = (unsigned long)__pc;
	int i, j, cpu;
	struct profile_hit *hits;

	pc = min((pc - (unsigned long)_stext) >> prof_shift, prof_len - 1);
	i = primary = (pc & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
	secondary = (~(pc << 1) & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
	cpu = get_cpu();
	hits = per_cpu(cpu_profile_hits, cpu)[per_cpu(cpu_profile_flip, cpu)];
	if (!hits) {
		put_cpu();
		return;
	}
	/*
	 * We buffer the global profiler buffer into a per-CPU
	 * queue and thus reduce the number of global (and possibly
	 * NUMA-alien) accesses. The write-queue is self-coalescing:
	 */
	local_irq_save(flags);
	do {
		for (j = 0; j < PROFILE_GRPSZ; ++j) {
			if (hits[i + j].pc == pc) {
				hits[i + j].hits += nr_hits;
				goto out;
			} else if (!hits[i + j].hits) {
				hits[i + j].pc = pc;
				hits[i + j].hits = nr_hits;
				goto out;
			}
		}
		i = (i + secondary) & (NR_PROFILE_HIT - 1);
	} while (i != primary);

	/*
	 * Add the current hit(s) and flush the write-queue out
	 * to the global buffer:
	 */
	atomic_add(nr_hits, &prof_buffer[pc]);
	for (i = 0; i < NR_PROFILE_HIT; ++i) {
		atomic_add(hits[i].hits, &prof_buffer[hits[i].pc]);
		hits[i].pc = hits[i].hits = 0;
	}
out:
	local_irq_restore(flags);
	put_cpu();
}

static int profile_cpu_callback(struct notifier_block *info,
					unsigned long action, void *__cpu)
{
	int node, cpu = (unsigned long)__cpu;
	struct page *page;

	switch (action) {
	case CPU_UP_PREPARE:
	case CPU_UP_PREPARE_FROZEN:
		node = cpu_to_mem(cpu);
		per_cpu(cpu_profile_flip, cpu) = 0;
		if (!per_cpu(cpu_profile_hits, cpu)[1]) {
			page = alloc_pages_exact_node(node,
					GFP_KERNEL | __GFP_ZERO,
					0);
			if (!page)
				return notifier_from_errno(-ENOMEM);
			per_cpu(cpu_profile_hits, cpu)[1] = page_address(page);
		}
		if (!per_cpu(cpu_profile_hits, cpu)[0]) {
			page = alloc_pages_exact_node(node,
					GFP_KERNEL | __GFP_ZERO,
					0);
			if (!page)
				goto out_free;
			per_cpu(cpu_profile_hits, cpu)[0] = page_address(page);
		}
		break;
out_free:
		page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
		per_cpu(cpu_profile_hits, cpu)[1] = NULL;
		__free_page(page);
		return notifier_from_errno(-ENOMEM);
	case CPU_ONLINE:
	case CPU_ONLINE_FROZEN:
		if (prof_cpu_mask != NULL)
			cpumask_set_cpu(cpu, prof_cpu_mask);
		break;
	case CPU_UP_CANCELED:
	case CPU_UP_CANCELED_FROZEN:
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		if (prof_cpu_mask != NULL)
			cpumask_clear_cpu(cpu, prof_cpu_mask);
		if (per_cpu(cpu_profile_hits, cpu)[0]) {
			page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]);
			per_cpu(cpu_profile_hits, cpu)[0] = NULL;
			__free_page(page);
		}
		if (per_cpu(cpu_profile_hits, cpu)[1]) {
			page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
			per_cpu(cpu_profile_hits, cpu)[1] = NULL;
			__free_page(page);
		}
		break;
	}
	return NOTIFY_OK;
}
#else /* !CONFIG_SMP */
#define profile_flip_buffers()		do { } while (0)
#define profile_discard_flip_buffers()	do { } while (0)
#define profile_cpu_callback		NULL

static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
{
	unsigned long pc;
	pc = ((unsigned long)__pc - (unsigned long)_stext) >> prof_shift;
	atomic_add(nr_hits, &prof_buffer[min(pc, prof_len - 1)]);
}
#endif /* !CONFIG_SMP */

void profile_hits(int type, void *__pc, unsigned int nr_hits)
{
	if (prof_on != type || !prof_buffer)
		return;
	do_profile_hits(type, __pc, nr_hits);
}
EXPORT_SYMBOL_GPL(profile_hits);

void profile_tick(int type)
{
	struct pt_regs *regs = get_irq_regs();

	if (!user_mode(regs) && prof_cpu_mask != NULL &&
	    cpumask_test_cpu(smp_processor_id(), prof_cpu_mask))
		profile_hit(type, (void *)profile_pc(regs));
}

#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>

static int prof_cpu_mask_proc_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%*pb\n", cpumask_pr_args(prof_cpu_mask));
	return 0;
}

static int prof_cpu_mask_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, prof_cpu_mask_proc_show, NULL);
}

static ssize_t prof_cpu_mask_proc_write(struct file *file,
	const char __user *buffer, size_t count, loff_t *pos)
{
	cpumask_var_t new_value;
	int err;

	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
		return -ENOMEM;

	err = cpumask_parse_user(buffer, count, new_value);
	if (!err) {
		cpumask_copy(prof_cpu_mask, new_value);
		err = count;
	}
	free_cpumask_var(new_value);
	return err;
}

static const struct file_operations prof_cpu_mask_proc_fops = {
	.open		= prof_cpu_mask_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= prof_cpu_mask_proc_write,
};

void create_prof_cpu_mask(void)
{
	/* create /proc/irq/prof_cpu_mask */
	proc_create("irq/prof_cpu_mask", 0600, NULL, &prof_cpu_mask_proc_fops);
}

/*
 * This function accesses profiling information. The returned data is
 * binary: the sampling step and the actual contents of the profile
 * buffer. Use of the program readprofile is recommended in order to
 * get meaningful info out of these data.
 */
static ssize_t
read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	unsigned long p = *ppos;
	ssize_t read;
	char *pnt;
	unsigned int sample_step = 1 << prof_shift;

	profile_flip_buffers();
	if (p >= (prof_len+1)*sizeof(unsigned int))
		return 0;
	if (count > (prof_len+1)*sizeof(unsigned int) - p)
		count = (prof_len+1)*sizeof(unsigned int) - p;
	read = 0;

	while (p < sizeof(unsigned int) && count > 0) {
		if (put_user(*((char *)(&sample_step)+p), buf))
			return -EFAULT;
		buf++; p++; count--; read++;
	}
	pnt = (char *)prof_buffer + p - sizeof(atomic_t);
	if (copy_to_user(buf, (void *)pnt, count))
		return -EFAULT;
	read += count;
	*ppos += read;
	return read;
}

/*
 * Writing to /proc/profile resets the counters
 *
 * Writing a 'profiling multiplier' value into it also re-sets the profiling
 * interrupt frequency, on architectures that support this.
 */
static ssize_t write_profile(struct file *file, const char __user *buf,
			     size_t count, loff_t *ppos)
{
#ifdef CONFIG_SMP
	extern int setup_profiling_timer(unsigned int multiplier);

	if (count == sizeof(int)) {
		unsigned int multiplier;

		if (copy_from_user(&multiplier, buf, sizeof(int)))
			return -EFAULT;

		if (setup_profiling_timer(multiplier))
			return -EINVAL;
	}
#endif
	profile_discard_flip_buffers();
	memset(prof_buffer, 0, prof_len * sizeof(atomic_t));
	return count;
}

static const struct file_operations proc_profile_operations = {
	.read		= read_profile,
	.write		= write_profile,
	.llseek		= default_llseek,
};

#ifdef CONFIG_SMP
static void profile_nop(void *unused)
{
}

static int create_hash_tables(void)
{
	int cpu;

	for_each_online_cpu(cpu) {
		int node = cpu_to_mem(cpu);
		struct page *page;

		page = alloc_pages_exact_node(node,
				GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
				0);
		if (!page)
			goto out_cleanup;
		per_cpu(cpu_profile_hits, cpu)[1]
				= (struct profile_hit *)page_address(page);
		page = alloc_pages_exact_node(node,
				GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
				0);
		if (!page)
			goto out_cleanup;
		per_cpu(cpu_profile_hits, cpu)[0]
				= (struct profile_hit *)page_address(page);
	}
	return 0;
out_cleanup:
	prof_on = 0;
	smp_mb();
	on_each_cpu(profile_nop, NULL, 1);
	for_each_online_cpu(cpu) {
		struct page *page;

		if (per_cpu(cpu_profile_hits, cpu)[0]) {
			page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]);
			per_cpu(cpu_profile_hits, cpu)[0] = NULL;
			__free_page(page);
		}
		if (per_cpu(cpu_profile_hits, cpu)[1]) {
			page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
			per_cpu(cpu_profile_hits, cpu)[1] = NULL;
			__free_page(page);
		}
	}
	return -1;
}
#else
#define create_hash_tables()			({ 0; })
#endif

int __ref create_proc_profile(void) /* false positive from hotcpu_notifier */
{
	struct proc_dir_entry *entry;
	int err = 0;

	if (!prof_on)
		return 0;

	cpu_notifier_register_begin();

	if (create_hash_tables()) {
		err = -ENOMEM;
		goto out;
	}

	entry = proc_create("profile", S_IWUSR | S_IRUGO,
			    NULL, &proc_profile_operations);
	if (!entry)
		goto out;
	proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t));
	__hotcpu_notifier(profile_cpu_callback, 0);

out:
	cpu_notifier_register_done();
	return err;
}
subsys_initcall(create_proc_profile);
#endif /* CONFIG_PROC_FS */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/kernel/profile.c
	3	* Simple profiling. Manages a direct-mapped profile hit count buffer,
	4	* with configurable resolution, support for restricting the cpus on
	5	* which profiling is done, and switching between cpu time and
	6	* schedule() calls via kernel command line parameters passed at boot.
	7	*
	8	* Scheduler profiling support, Arjan van de Ven and Ingo Molnar,
	9	* Red Hat, July 2004
	10	* Consolidation of architecture support code for profiling,
6d49e352	11	* Nadia Yvette Chambers, Oracle, July 2004
1da177e4	12	* Amortized hit count accounting via per-cpu open-addressed hashtables
6d49e352 NYC	13	* to resolve timer interrupt livelocks, Nadia Yvette Chambers,
6d49e352 NYC	14	* Oracle, 2004
1da177e4 LT	15	*/
1da177e4 LT	16
9984de1a	17	#include <linux/export.h>
1da177e4 LT	18	#include <linux/profile.h>
	19	#include <linux/bootmem.h>
	20	#include <linux/notifier.h>
	21	#include <linux/mm.h>
	22	#include <linux/cpumask.h>
	23	#include <linux/cpu.h>
1da177e4	24	#include <linux/highmem.h>
97d1f15b	25	#include <linux/mutex.h>
22b8ce94 DH	26	#include <linux/slab.h>
22b8ce94 DH	27	#include <linux/vmalloc.h>
1da177e4	28	#include <asm/sections.h>
7d12e780	29	#include <asm/irq_regs.h>
e8edc6e0	30	#include <asm/ptrace.h>
1da177e4 LT	31
	32	struct profile_hit {
	33	u32 pc, hits;
	34	};
	35	#define PROFILE_GRPSHIFT 3
	36	#define PROFILE_GRPSZ (1 << PROFILE_GRPSHIFT)
	37	#define NR_PROFILE_HIT (PAGE_SIZE/sizeof(struct profile_hit))
	38	#define NR_PROFILE_GRP (NR_PROFILE_HIT/PROFILE_GRPSZ)
	39
1da177e4 LT	40	static atomic_t *prof_buffer;
1da177e4 LT	41	static unsigned long prof_len, prof_shift;
07031e14	42
ece8a684	43	int prof_on __read_mostly;
07031e14 IM	44	EXPORT_SYMBOL_GPL(prof_on);
07031e14 IM	45
c309b917	46	static cpumask_var_t prof_cpu_mask;
1da177e4 LT	47	#ifdef CONFIG_SMP
	48	static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits);
	49	static DEFINE_PER_CPU(int, cpu_profile_flip);
97d1f15b	50	static DEFINE_MUTEX(profile_flip_mutex);
1da177e4 LT	51	#endif /* CONFIG_SMP */
1da177e4 LT	52
22b8ce94	53	int profile_setup(char *str)
1da177e4	54	{
f3da64d1 FF	55	static const char schedstr[] = "schedule";
	56	static const char sleepstr[] = "sleep";
	57	static const char kvmstr[] = "kvm";
1da177e4 LT	58	int par;
1da177e4 LT	59
ece8a684	60	if (!strncmp(str, sleepstr, strlen(sleepstr))) {
b3da2a73	61	#ifdef CONFIG_SCHEDSTATS
ece8a684 IM	62	prof_on = SLEEP_PROFILING;
	63	if (str[strlen(sleepstr)] == ',')
	64	str += strlen(sleepstr) + 1;
	65	if (get_option(&str, &par))
	66	prof_shift = par;
aba871f1	67	pr_info("kernel sleep profiling enabled (shift: %ld)\n",
ece8a684	68	prof_shift);
b3da2a73	69	#else
aba871f1	70	pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
b3da2a73	71	#endif /* CONFIG_SCHEDSTATS */
a75acf85	72	} else if (!strncmp(str, schedstr, strlen(schedstr))) {
1da177e4	73	prof_on = SCHED_PROFILING;
dfaa9c94 NYC	74	if (str[strlen(schedstr)] == ',')
	75	str += strlen(schedstr) + 1;
	76	if (get_option(&str, &par))
	77	prof_shift = par;
aba871f1	78	pr_info("kernel schedule profiling enabled (shift: %ld)\n",
dfaa9c94	79	prof_shift);
07031e14 IM	80	} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
	81	prof_on = KVM_PROFILING;
	82	if (str[strlen(kvmstr)] == ',')
	83	str += strlen(kvmstr) + 1;
	84	if (get_option(&str, &par))
	85	prof_shift = par;
aba871f1	86	pr_info("kernel KVM profiling enabled (shift: %ld)\n",
07031e14	87	prof_shift);
dfaa9c94	88	} else if (get_option(&str, &par)) {
1da177e4 LT	89	prof_shift = par;
1da177e4 LT	90	prof_on = CPU_PROFILING;
aba871f1	91	pr_info("kernel profiling enabled (shift: %ld)\n",
1da177e4 LT	92	prof_shift);
	93	}
	94	return 1;
	95	}
	96	__setup("profile=", profile_setup);
	97
	98
ce05fcc3	99	int __ref profile_init(void)
1da177e4	100	{
22b8ce94	101	int buffer_bytes;
1ad82fd5	102	if (!prof_on)
22b8ce94	103	return 0;
1ad82fd5	104
1da177e4 LT	105	/* only text is profiled */
1da177e4 LT	106	prof_len = (_etext - _stext) >> prof_shift;
22b8ce94	107	buffer_bytes = prof_len*sizeof(atomic_t);
22b8ce94	108
c309b917 RR	109	if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
	110	return -ENOMEM;
	111
acd89579 HD	112	cpumask_copy(prof_cpu_mask, cpu_possible_mask);
acd89579 HD	113
b62f495d	114	prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL\|__GFP_NOWARN);
22b8ce94 DH	115	if (prof_buffer)
	116	return 0;
	117
b62f495d MG	118	prof_buffer = alloc_pages_exact(buffer_bytes,
b62f495d MG	119	GFP_KERNEL\|__GFP_ZERO\|__GFP_NOWARN);
22b8ce94 DH	120	if (prof_buffer)
	121	return 0;
	122
559fa6e7 JJ	123	prof_buffer = vzalloc(buffer_bytes);
559fa6e7 JJ	124	if (prof_buffer)
22b8ce94 DH	125	return 0;
22b8ce94 DH	126
c309b917	127	free_cpumask_var(prof_cpu_mask);
22b8ce94	128	return -ENOMEM;
1da177e4 LT	129	}
	130
	131	/* Profile event notifications */
1ad82fd5	132
e041c683 AS	133	static BLOCKING_NOTIFIER_HEAD(task_exit_notifier);
	134	static ATOMIC_NOTIFIER_HEAD(task_free_notifier);
	135	static BLOCKING_NOTIFIER_HEAD(munmap_notifier);
1ad82fd5 PC	136
1ad82fd5 PC	137	void profile_task_exit(struct task_struct *task)
1da177e4	138	{
e041c683	139	blocking_notifier_call_chain(&task_exit_notifier, 0, task);
1da177e4	140	}
1ad82fd5 PC	141
1ad82fd5 PC	142	int profile_handoff_task(struct task_struct *task)
1da177e4 LT	143	{
1da177e4 LT	144	int ret;
e041c683	145	ret = atomic_notifier_call_chain(&task_free_notifier, 0, task);
1da177e4 LT	146	return (ret == NOTIFY_OK) ? 1 : 0;
	147	}
	148
	149	void profile_munmap(unsigned long addr)
	150	{
e041c683	151	blocking_notifier_call_chain(&munmap_notifier, 0, (void *)addr);
1da177e4 LT	152	}
1da177e4 LT	153
1ad82fd5	154	int task_handoff_register(struct notifier_block *n)
1da177e4	155	{
e041c683	156	return atomic_notifier_chain_register(&task_free_notifier, n);
1da177e4	157	}
1ad82fd5	158	EXPORT_SYMBOL_GPL(task_handoff_register);
1da177e4	159
1ad82fd5	160	int task_handoff_unregister(struct notifier_block *n)
1da177e4	161	{
e041c683	162	return atomic_notifier_chain_unregister(&task_free_notifier, n);
1da177e4	163	}
1ad82fd5	164	EXPORT_SYMBOL_GPL(task_handoff_unregister);
1da177e4	165
1ad82fd5	166	int profile_event_register(enum profile_type type, struct notifier_block *n)
1da177e4 LT	167	{
1da177e4 LT	168	int err = -EINVAL;
1ad82fd5	169
1da177e4	170	switch (type) {
1ad82fd5 PC	171	case PROFILE_TASK_EXIT:
	172	err = blocking_notifier_chain_register(
	173	&task_exit_notifier, n);
	174	break;
	175	case PROFILE_MUNMAP:
	176	err = blocking_notifier_chain_register(
	177	&munmap_notifier, n);
	178	break;
1da177e4	179	}
1ad82fd5	180
1da177e4 LT	181	return err;
1da177e4 LT	182	}
1ad82fd5	183	EXPORT_SYMBOL_GPL(profile_event_register);
1da177e4	184
1ad82fd5	185	int profile_event_unregister(enum profile_type type, struct notifier_block *n)
1da177e4 LT	186	{
1da177e4 LT	187	int err = -EINVAL;
1ad82fd5	188
1da177e4	189	switch (type) {
1ad82fd5 PC	190	case PROFILE_TASK_EXIT:
	191	err = blocking_notifier_chain_unregister(
	192	&task_exit_notifier, n);
	193	break;
	194	case PROFILE_MUNMAP:
	195	err = blocking_notifier_chain_unregister(
	196	&munmap_notifier, n);
	197	break;
1da177e4 LT	198	}
1da177e4 LT	199
1da177e4 LT	200	return err;
1da177e4 LT	201	}
1ad82fd5	202	EXPORT_SYMBOL_GPL(profile_event_unregister);
1da177e4	203
1da177e4 LT	204	#ifdef CONFIG_SMP
	205	/*
	206	* Each cpu has a pair of open-addressed hashtables for pending
	207	* profile hits. read_profile() IPI's all cpus to request them
	208	* to flip buffers and flushes their contents to prof_buffer itself.
	209	* Flip requests are serialized by the profile_flip_mutex. The sole
	210	* use of having a second hashtable is for avoiding cacheline
	211	* contention that would otherwise happen during flushes of pending
	212	* profile hits required for the accuracy of reported profile hits
	213	* and so resurrect the interrupt livelock issue.
	214	*
	215	* The open-addressed hashtables are indexed by profile buffer slot
	216	* and hold the number of pending hits to that profile buffer slot on
	217	* a cpu in an entry. When the hashtable overflows, all pending hits
	218	* are accounted to their corresponding profile buffer slots with
	219	* atomic_add() and the hashtable emptied. As numerous pending hits
	220	* may be accounted to a profile buffer slot in a hashtable entry,
	221	* this amortizes a number of atomic profile buffer increments likely
	222	* to be far larger than the number of entries in the hashtable,
	223	* particularly given that the number of distinct profile buffer
	224	* positions to which hits are accounted during short intervals (e.g.
	225	* several seconds) is usually very small. Exclusion from buffer
	226	* flipping is provided by interrupt disablement (note that for
ece8a684 IM	227	* SCHED_PROFILING or SLEEP_PROFILING profile_hit() may be called from
ece8a684 IM	228	* process context).
1da177e4 LT	229	* The hash function is meant to be lightweight as opposed to strong,
	230	* and was vaguely inspired by ppc64 firmware-supported inverted
	231	* pagetable hash functions, but uses a full hashtable full of finite
	232	* collision chains, not just pairs of them.
	233	*
6d49e352	234	* -- nyc
1da177e4 LT	235	*/
	236	static void __profile_flip_buffers(void *unused)
	237	{
	238	int cpu = smp_processor_id();
	239
	240	per_cpu(cpu_profile_flip, cpu) = !per_cpu(cpu_profile_flip, cpu);
	241	}
	242
	243	static void profile_flip_buffers(void)
	244	{
	245	int i, j, cpu;
	246
97d1f15b	247	mutex_lock(&profile_flip_mutex);
1da177e4 LT	248	j = per_cpu(cpu_profile_flip, get_cpu());
1da177e4 LT	249	put_cpu();
15c8b6c1	250	on_each_cpu(__profile_flip_buffers, NULL, 1);
1da177e4 LT	251	for_each_online_cpu(cpu) {
	252	struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[j];
	253	for (i = 0; i < NR_PROFILE_HIT; ++i) {
	254	if (!hits[i].hits) {
	255	if (hits[i].pc)
	256	hits[i].pc = 0;
	257	continue;
	258	}
	259	atomic_add(hits[i].hits, &prof_buffer[hits[i].pc]);
	260	hits[i].hits = hits[i].pc = 0;
	261	}
	262	}
97d1f15b	263	mutex_unlock(&profile_flip_mutex);
1da177e4 LT	264	}
	265
	266	static void profile_discard_flip_buffers(void)
	267	{
	268	int i, cpu;
	269
97d1f15b	270	mutex_lock(&profile_flip_mutex);
1da177e4 LT	271	i = per_cpu(cpu_profile_flip, get_cpu());
1da177e4 LT	272	put_cpu();
15c8b6c1	273	on_each_cpu(__profile_flip_buffers, NULL, 1);
1da177e4 LT	274	for_each_online_cpu(cpu) {
	275	struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[i];
	276	memset(hits, 0, NR_PROFILE_HIT*sizeof(struct profile_hit));
	277	}
97d1f15b	278	mutex_unlock(&profile_flip_mutex);
1da177e4 LT	279	}
1da177e4 LT	280
6f7bd76f	281	static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
1da177e4 LT	282	{
	283	unsigned long primary, secondary, flags, pc = (unsigned long)__pc;
	284	int i, j, cpu;
	285	struct profile_hit *hits;
	286
1da177e4 LT	287	pc = min((pc - (unsigned long)_stext) >> prof_shift, prof_len - 1);
	288	i = primary = (pc & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
	289	secondary = (~(pc << 1) & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
	290	cpu = get_cpu();
	291	hits = per_cpu(cpu_profile_hits, cpu)[per_cpu(cpu_profile_flip, cpu)];
	292	if (!hits) {
	293	put_cpu();
	294	return;
	295	}
ece8a684 IM	296	/*
	297	* We buffer the global profiler buffer into a per-CPU
	298	* queue and thus reduce the number of global (and possibly
	299	* NUMA-alien) accesses. The write-queue is self-coalescing:
	300	*/
1da177e4 LT	301	local_irq_save(flags);
	302	do {
	303	for (j = 0; j < PROFILE_GRPSZ; ++j) {
	304	if (hits[i + j].pc == pc) {
ece8a684	305	hits[i + j].hits += nr_hits;
1da177e4 LT	306	goto out;
	307	} else if (!hits[i + j].hits) {
	308	hits[i + j].pc = pc;
ece8a684	309	hits[i + j].hits = nr_hits;
1da177e4 LT	310	goto out;
	311	}
	312	}
	313	i = (i + secondary) & (NR_PROFILE_HIT - 1);
	314	} while (i != primary);
ece8a684 IM	315
	316	/*
	317	* Add the current hit(s) and flush the write-queue out
	318	* to the global buffer:
	319	*/
	320	atomic_add(nr_hits, &prof_buffer[pc]);
1da177e4 LT	321	for (i = 0; i < NR_PROFILE_HIT; ++i) {
	322	atomic_add(hits[i].hits, &prof_buffer[hits[i].pc]);
	323	hits[i].pc = hits[i].hits = 0;
	324	}
	325	out:
	326	local_irq_restore(flags);
	327	put_cpu();
	328	}
	329
0db0628d	330	static int profile_cpu_callback(struct notifier_block *info,
1da177e4 LT	331	unsigned long action, void *__cpu)
	332	{
	333	int node, cpu = (unsigned long)__cpu;
	334	struct page *page;
	335
	336	switch (action) {
	337	case CPU_UP_PREPARE:
8bb78442	338	case CPU_UP_PREPARE_FROZEN:
3dd6b5fb	339	node = cpu_to_mem(cpu);
1da177e4 LT	340	per_cpu(cpu_profile_flip, cpu) = 0;
1da177e4 LT	341	if (!per_cpu(cpu_profile_hits, cpu)[1]) {
6484eb3e	342	page = alloc_pages_exact_node(node,
4199cfa0	343	GFP_KERNEL \| __GFP_ZERO,
fbd98167	344	0);
1da177e4	345	if (!page)
80b5184c	346	return notifier_from_errno(-ENOMEM);
1da177e4 LT	347	per_cpu(cpu_profile_hits, cpu)[1] = page_address(page);
	348	}
	349	if (!per_cpu(cpu_profile_hits, cpu)[0]) {
6484eb3e	350	page = alloc_pages_exact_node(node,
4199cfa0	351	GFP_KERNEL \| __GFP_ZERO,
fbd98167	352	0);
1da177e4 LT	353	if (!page)
	354	goto out_free;
	355	per_cpu(cpu_profile_hits, cpu)[0] = page_address(page);
	356	}
	357	break;
1ad82fd5	358	out_free:
1da177e4 LT	359	page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
	360	per_cpu(cpu_profile_hits, cpu)[1] = NULL;
	361	__free_page(page);
80b5184c	362	return notifier_from_errno(-ENOMEM);
1da177e4	363	case CPU_ONLINE:
8bb78442	364	case CPU_ONLINE_FROZEN:
c309b917 RR	365	if (prof_cpu_mask != NULL)
c309b917 RR	366	cpumask_set_cpu(cpu, prof_cpu_mask);
1da177e4 LT	367	break;
1da177e4 LT	368	case CPU_UP_CANCELED:
8bb78442	369	case CPU_UP_CANCELED_FROZEN:
1da177e4	370	case CPU_DEAD:
8bb78442	371	case CPU_DEAD_FROZEN:
c309b917 RR	372	if (prof_cpu_mask != NULL)
c309b917 RR	373	cpumask_clear_cpu(cpu, prof_cpu_mask);
1da177e4 LT	374	if (per_cpu(cpu_profile_hits, cpu)[0]) {
	375	page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]);
	376	per_cpu(cpu_profile_hits, cpu)[0] = NULL;
	377	__free_page(page);
	378	}
	379	if (per_cpu(cpu_profile_hits, cpu)[1]) {
	380	page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
	381	per_cpu(cpu_profile_hits, cpu)[1] = NULL;
	382	__free_page(page);
	383	}
	384	break;
	385	}
	386	return NOTIFY_OK;
	387	}
1da177e4 LT	388	#else /* !CONFIG_SMP */
	389	#define profile_flip_buffers() do { } while (0)
	390	#define profile_discard_flip_buffers() do { } while (0)
02316067	391	#define profile_cpu_callback NULL
1da177e4	392
6f7bd76f	393	static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
1da177e4 LT	394	{
1da177e4 LT	395	unsigned long pc;
1da177e4	396	pc = ((unsigned long)__pc - (unsigned long)_stext) >> prof_shift;
ece8a684	397	atomic_add(nr_hits, &prof_buffer[min(pc, prof_len - 1)]);
1da177e4 LT	398	}
1da177e4 LT	399	#endif /* !CONFIG_SMP */
6f7bd76f RM	400
	401	void profile_hits(int type, void *__pc, unsigned int nr_hits)
	402	{
	403	if (prof_on != type \|\| !prof_buffer)
	404	return;
	405	do_profile_hits(type, __pc, nr_hits);
	406	}
bbe1a59b AM	407	EXPORT_SYMBOL_GPL(profile_hits);
bbe1a59b AM	408
7d12e780	409	void profile_tick(int type)
1da177e4	410	{
7d12e780 DH	411	struct pt_regs *regs = get_irq_regs();
7d12e780 DH	412
c309b917 RR	413	if (!user_mode(regs) && prof_cpu_mask != NULL &&
c309b917 RR	414	cpumask_test_cpu(smp_processor_id(), prof_cpu_mask))
1da177e4 LT	415	profile_hit(type, (void *)profile_pc(regs));
	416	}
	417
	418	#ifdef CONFIG_PROC_FS
	419	#include <linux/proc_fs.h>
583a22e7	420	#include <linux/seq_file.h>
1da177e4	421	#include <asm/uaccess.h>
1da177e4	422
583a22e7	423	static int prof_cpu_mask_proc_show(struct seq_file m, void v)
1da177e4	424	{
ccbd59c1	425	seq_printf(m, "%*pb\n", cpumask_pr_args(prof_cpu_mask));
583a22e7 AD	426	return 0;
	427	}
	428
	429	static int prof_cpu_mask_proc_open(struct inode inode, struct file file)
	430	{
	431	return single_open(file, prof_cpu_mask_proc_show, NULL);
1da177e4 LT	432	}
1da177e4 LT	433
583a22e7 AD	434	static ssize_t prof_cpu_mask_proc_write(struct file *file,
583a22e7 AD	435	const char __user buffer, size_t count, loff_t pos)
1da177e4	436	{
c309b917	437	cpumask_var_t new_value;
583a22e7	438	int err;
1da177e4	439
c309b917 RR	440	if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
c309b917 RR	441	return -ENOMEM;
1da177e4	442
c309b917 RR	443	err = cpumask_parse_user(buffer, count, new_value);
c309b917 RR	444	if (!err) {
583a22e7 AD	445	cpumask_copy(prof_cpu_mask, new_value);
583a22e7 AD	446	err = count;
c309b917 RR	447	}
	448	free_cpumask_var(new_value);
	449	return err;
1da177e4 LT	450	}
1da177e4 LT	451
583a22e7 AD	452	static const struct file_operations prof_cpu_mask_proc_fops = {
	453	.open = prof_cpu_mask_proc_open,
	454	.read = seq_read,
	455	.llseek = seq_lseek,
	456	.release = single_release,
	457	.write = prof_cpu_mask_proc_write,
	458	};
	459
fbd387ae	460	void create_prof_cpu_mask(void)
1da177e4	461	{
1da177e4	462	/* create /proc/irq/prof_cpu_mask */
fbd387ae	463	proc_create("irq/prof_cpu_mask", 0600, NULL, &prof_cpu_mask_proc_fops);
1da177e4 LT	464	}
	465
	466	/*
	467	* This function accesses profiling information. The returned data is
	468	* binary: the sampling step and the actual contents of the profile
	469	* buffer. Use of the program readprofile is recommended in order to
	470	* get meaningful info out of these data.
	471	*/
	472	static ssize_t
	473	read_profile(struct file file, char __user buf, size_t count, loff_t *ppos)
	474	{
	475	unsigned long p = *ppos;
	476	ssize_t read;
1ad82fd5	477	char *pnt;
1da177e4 LT	478	unsigned int sample_step = 1 << prof_shift;
	479
	480	profile_flip_buffers();
	481	if (p >= (prof_len+1)*sizeof(unsigned int))
	482	return 0;
	483	if (count > (prof_len+1)*sizeof(unsigned int) - p)
	484	count = (prof_len+1)*sizeof(unsigned int) - p;
	485	read = 0;
	486
	487	while (p < sizeof(unsigned int) && count > 0) {
1ad82fd5	488	if (put_user(((char )(&sample_step)+p), buf))
064b022c	489	return -EFAULT;
1da177e4 LT	490	buf++; p++; count--; read++;
	491	}
	492	pnt = (char *)prof_buffer + p - sizeof(atomic_t);
1ad82fd5	493	if (copy_to_user(buf, (void *)pnt, count))
1da177e4 LT	494	return -EFAULT;
	495	read += count;
	496	*ppos += read;
	497	return read;
	498	}
	499
	500	/*
	501	* Writing to /proc/profile resets the counters
	502	*
	503	* Writing a 'profiling multiplier' value into it also re-sets the profiling
	504	* interrupt frequency, on architectures that support this.
	505	*/
	506	static ssize_t write_profile(struct file file, const char __user buf,
	507	size_t count, loff_t *ppos)
	508	{
	509	#ifdef CONFIG_SMP
1ad82fd5	510	extern int setup_profiling_timer(unsigned int multiplier);
1da177e4 LT	511
	512	if (count == sizeof(int)) {
	513	unsigned int multiplier;
	514
	515	if (copy_from_user(&multiplier, buf, sizeof(int)))
	516	return -EFAULT;
	517
	518	if (setup_profiling_timer(multiplier))
	519	return -EINVAL;
	520	}
	521	#endif
	522	profile_discard_flip_buffers();
	523	memset(prof_buffer, 0, prof_len * sizeof(atomic_t));
	524	return count;
	525	}
	526
15ad7cdc	527	static const struct file_operations proc_profile_operations = {
1da177e4 LT	528	.read = read_profile,
1da177e4 LT	529	.write = write_profile,
6038f373	530	.llseek = default_llseek,
1da177e4 LT	531	};
	532
	533	#ifdef CONFIG_SMP
60a51513	534	static void profile_nop(void *unused)
1da177e4 LT	535	{
	536	}
	537
22b8ce94	538	static int create_hash_tables(void)
1da177e4 LT	539	{
	540	int cpu;
	541
	542	for_each_online_cpu(cpu) {
3dd6b5fb	543	int node = cpu_to_mem(cpu);
1da177e4 LT	544	struct page *page;
1da177e4 LT	545
6484eb3e	546	page = alloc_pages_exact_node(node,
e97ca8e5	547	GFP_KERNEL \| __GFP_ZERO \| __GFP_THISNODE,
fbd98167	548	0);
1da177e4 LT	549	if (!page)
	550	goto out_cleanup;
	551	per_cpu(cpu_profile_hits, cpu)[1]
	552	= (struct profile_hit *)page_address(page);
6484eb3e	553	page = alloc_pages_exact_node(node,
e97ca8e5	554	GFP_KERNEL \| __GFP_ZERO \| __GFP_THISNODE,
fbd98167	555	0);
1da177e4 LT	556	if (!page)
	557	goto out_cleanup;
	558	per_cpu(cpu_profile_hits, cpu)[0]
	559	= (struct profile_hit *)page_address(page);
	560	}
	561	return 0;
	562	out_cleanup:
	563	prof_on = 0;
d59dd462	564	smp_mb();
15c8b6c1	565	on_each_cpu(profile_nop, NULL, 1);
1da177e4 LT	566	for_each_online_cpu(cpu) {
	567	struct page *page;
	568
	569	if (per_cpu(cpu_profile_hits, cpu)[0]) {
	570	page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]);
	571	per_cpu(cpu_profile_hits, cpu)[0] = NULL;
	572	__free_page(page);
	573	}
	574	if (per_cpu(cpu_profile_hits, cpu)[1]) {
	575	page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
	576	per_cpu(cpu_profile_hits, cpu)[1] = NULL;
	577	__free_page(page);
	578	}
	579	}
	580	return -1;
	581	}
	582	#else
	583	#define create_hash_tables() ({ 0; })
	584	#endif
	585
84196414	586	int __ref create_proc_profile(void) /* false positive from hotcpu_notifier */
1da177e4 LT	587	{
1da177e4 LT	588	struct proc_dir_entry *entry;
c270a817	589	int err = 0;
1da177e4 LT	590
	591	if (!prof_on)
	592	return 0;
c270a817 SB	593
	594	cpu_notifier_register_begin();
	595
	596	if (create_hash_tables()) {
	597	err = -ENOMEM;
	598	goto out;
	599	}
	600
c33fff0a DL	601	entry = proc_create("profile", S_IWUSR \| S_IRUGO,
c33fff0a DL	602	NULL, &proc_profile_operations);
1ad82fd5	603	if (!entry)
c270a817	604	goto out;
271a15ea	605	proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t));
c270a817 SB	606	__hotcpu_notifier(profile_cpu_callback, 0);
	607
	608	out:
	609	cpu_notifier_register_done();
	610	return err;
1da177e4	611	}
c96d6660	612	subsys_initcall(create_proc_profile);
1da177e4	613	#endif /* CONFIG_PROC_FS */