[lttng-modules.git] / src / lttng-context.c

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 *
 * lttng-context.c
 *
 * LTTng trace/channel/event context management.
 *
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <linux/module.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
#include <lttng/events.h>
#include <lttng/tracer.h>

/*
 * The filter implementation requires that two consecutive "get" for the
 * same context performed by the same thread return the same result.
 */

/*
 * Static array of contexts, for $ctx filters.
 */
struct lttng_ctx *lttng_static_ctx;

int lttng_find_context(struct lttng_ctx *ctx, const char *name)
{
	unsigned int i;

	if (!ctx)
		return 0;
	for (i = 0; i < ctx->nr_fields; i++) {
		/* Skip allocated (but non-initialized) contexts */
		if (!ctx->fields[i].event_field.name)
			continue;
		if (!strcmp(ctx->fields[i].event_field.name, name))
			return 1;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(lttng_find_context);

int lttng_get_context_index(struct lttng_ctx *ctx, const char *name)
{
	unsigned int i;
	const char *subname;

	if (!ctx)
		return -1;
	if (strncmp(name, "$ctx.", strlen("$ctx.")) == 0) {
		subname = name + strlen("$ctx.");
	} else {
		subname = name;
	}
	for (i = 0; i < ctx->nr_fields; i++) {
		/* Skip allocated (but non-initialized) contexts */
		if (!ctx->fields[i].event_field.name)
			continue;
		if (!strcmp(ctx->fields[i].event_field.name, subname))
			return i;
	}
	return -1;
}
EXPORT_SYMBOL_GPL(lttng_get_context_index);

struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
		size_t index)
{
	if (index >= ctx->nr_fields)
		return NULL;
	return &ctx->fields[index];
}
EXPORT_SYMBOL_GPL(lttng_get_context_field_from_index);

/*
 * Note: as we append context information, the pointer location may change.
 */
ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p)
{
	struct lttng_ctx *ctx;
	ssize_t pos = -1;

	if (!*ctx_p) {
		*ctx_p = kzalloc(sizeof(struct lttng_ctx), GFP_KERNEL);
		if (!*ctx_p)
			goto end;
		(*ctx_p)->largest_align = 1;
	}
	ctx = *ctx_p;
	if (ctx->nr_fields + 1 > ctx->allocated_fields) {
		struct lttng_ctx_field *new_fields;

		ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
		new_fields = lttng_kvzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
		if (!new_fields)
			goto end;
		if (ctx->fields)
			memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields);
		lttng_kvfree(ctx->fields);
		ctx->fields = new_fields;
	}
	pos = ctx->nr_fields++;
end:
	return pos;
}
EXPORT_SYMBOL_GPL(lttng_append_context_index);

/*
 * Note: as we append context information, the pointer location may change.
 */
struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p)
{
	ssize_t pos;

	pos = lttng_append_context_index(ctx_p);
	if (pos < 0)
		return NULL;
	return &(*ctx_p)->fields[pos];
}
EXPORT_SYMBOL_GPL(lttng_append_context);

/*
 * lttng_context_update() should be called at least once between context
 * modification and trace start.
 */
void lttng_context_update(struct lttng_ctx *ctx)
{
	int i;
	size_t largest_align = 8;	/* in bits */

	for (i = 0; i < ctx->nr_fields; i++) {
		struct lttng_type *type;
		size_t field_align = 8;

		type = &ctx->fields[i].event_field.type;
		switch (type->atype) {
		case atype_integer:
			field_align = type->u.integer.alignment;
			break;
		case atype_array_nestable:
		{
			const struct lttng_type *nested_type;

			nested_type = type->u.array_nestable.elem_type;
			switch (nested_type->atype) {
			case atype_integer:
				field_align = nested_type->u.integer.alignment;
				break;
			case atype_string:
				break;

			case atype_array_nestable:
			case atype_sequence_nestable:
			case atype_struct_nestable:
			case atype_variant_nestable:
			default:
				WARN_ON_ONCE(1);
				break;
			}
			field_align = max_t(size_t, field_align,
					type->u.array_nestable.alignment);
			break;
		}
		case atype_sequence_nestable:
		{
			const struct lttng_type *nested_type;

			nested_type = type->u.sequence_nestable.elem_type;
			switch (nested_type->atype) {
			case atype_integer:
				field_align = nested_type->u.integer.alignment;
				break;

			case atype_string:
				break;

			case atype_array_nestable:
			case atype_sequence_nestable:
			case atype_struct_nestable:
			case atype_variant_nestable:
			default:
				WARN_ON_ONCE(1);
				break;
			}
			field_align = max_t(size_t, field_align,
					type->u.sequence_nestable.alignment);
			break;
		}
		case atype_string:
			break;

		case atype_struct_nestable:
		case atype_variant_nestable:
			break;

		case atype_enum_nestable:
		default:
			WARN_ON_ONCE(1);
			break;
		}
		largest_align = max_t(size_t, largest_align, field_align);
	}
	ctx->largest_align = largest_align >> 3;	/* bits to bytes */
}

/* Keep same order. */
void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index)
{
	struct lttng_ctx *ctx = *ctx_p;

	WARN_ON_ONCE(ctx->nr_fields >= index);
	if (index != ctx->nr_fields - 1) {
		memmove(&ctx->fields[index], &ctx->fields[index + 1],
			(ctx->nr_fields - index - 1) * sizeof(struct lttng_ctx_field));
	}
	/* Clear last item. */
	memset(&ctx->fields[ctx->nr_fields - 1], 0, sizeof(struct lttng_ctx_field));
	ctx->nr_fields--;
}
EXPORT_SYMBOL_GPL(lttng_remove_context_field_index);

/*
 * Remove last context field.
 */
void lttng_remove_context_field(struct lttng_ctx **ctx_p,
				struct lttng_ctx_field *field)
{
	struct lttng_ctx *ctx;

	ctx = *ctx_p;
	ctx->nr_fields--;
	WARN_ON_ONCE(&ctx->fields[ctx->nr_fields] != field);
	memset(&ctx->fields[ctx->nr_fields], 0, sizeof(struct lttng_ctx_field));
}
EXPORT_SYMBOL_GPL(lttng_remove_context_field);

void lttng_destroy_context(struct lttng_ctx *ctx)
{
	int i;

	if (!ctx)
		return;
	for (i = 0; i < ctx->nr_fields; i++) {
		if (ctx->fields[i].destroy)
			ctx->fields[i].destroy(&ctx->fields[i]);
	}
	lttng_kvfree(ctx->fields);
	kfree(ctx);
}

int lttng_context_init(void)
{
	int ret;

	ret = lttng_add_hostname_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_hostname_to_ctx");
	}
	ret = lttng_add_nice_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_nice_to_ctx");
	}
	ret = lttng_add_pid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_pid_to_ctx");
	}
	ret = lttng_add_ppid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_ppid_to_ctx");
	}
	ret = lttng_add_prio_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_prio_to_ctx");
	}
	ret = lttng_add_procname_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_procname_to_ctx");
	}
	ret = lttng_add_tid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_tid_to_ctx");
	}
	ret = lttng_add_vppid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_vppid_to_ctx");
	}
	ret = lttng_add_vtid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_vtid_to_ctx");
	}
	ret = lttng_add_vpid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_vpid_to_ctx");
	}
	ret = lttng_add_cpu_id_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_cpu_id_to_ctx");
	}
	ret = lttng_add_interruptible_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_interruptible_to_ctx");
	}
	ret = lttng_add_need_reschedule_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_need_reschedule_to_ctx");
	}
	ret = lttng_add_preemptible_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_preemptible_to_ctx");
	}
	ret = lttng_add_migratable_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_migratable_to_ctx");
	}
	ret = lttng_add_cgroup_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_cgroup_ns_to_ctx");
	}
	ret = lttng_add_ipc_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_ipc_ns_to_ctx");
	}
	ret = lttng_add_mnt_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_mnt_ns_to_ctx");
	}
	ret = lttng_add_net_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_net_ns_to_ctx");
	}
	ret = lttng_add_pid_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_pid_ns_to_ctx");
	}
	ret = lttng_add_user_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_user_ns_to_ctx");
	}
	ret = lttng_add_uts_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_uts_ns_to_ctx");
	}
	ret = lttng_add_time_ns_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "LTTng: Cannot add context lttng_add_time_ns_to_ctx");
	}
	/* TODO: perf counters for filtering */
	return 0;
}

void lttng_context_exit(void)
{
	lttng_destroy_context(lttng_static_ctx);
	lttng_static_ctx = NULL;
}
Commit	Line	Data
	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
	2	*
	3	* lttng-context.c
	4	*
	5	* LTTng trace/channel/event context management.
	6	*
	7	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/list.h>
	12	#include <linux/mutex.h>
	13	#include <linux/slab.h>
	14	#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
	15	#include <lttng/events.h>
	16	#include <lttng/tracer.h>
	17
	18	/*
	19	* The filter implementation requires that two consecutive "get" for the
	20	* same context performed by the same thread return the same result.
	21	*/
	22
	23	/*
	24	* Static array of contexts, for $ctx filters.
	25	*/
	26	struct lttng_ctx *lttng_static_ctx;
	27
	28	int lttng_find_context(struct lttng_ctx ctx, const char name)
	29	{
	30	unsigned int i;
	31
	32	if (!ctx)
	33	return 0;
	34	for (i = 0; i < ctx->nr_fields; i++) {
	35	/* Skip allocated (but non-initialized) contexts */
	36	if (!ctx->fields[i].event_field.name)
	37	continue;
	38	if (!strcmp(ctx->fields[i].event_field.name, name))
	39	return 1;
	40	}
	41	return 0;
	42	}
	43	EXPORT_SYMBOL_GPL(lttng_find_context);
	44
	45	int lttng_get_context_index(struct lttng_ctx ctx, const char name)
	46	{
	47	unsigned int i;
	48	const char *subname;
	49
	50	if (!ctx)
	51	return -1;
	52	if (strncmp(name, "$ctx.", strlen("$ctx.")) == 0) {
	53	subname = name + strlen("$ctx.");
	54	} else {
	55	subname = name;
	56	}
	57	for (i = 0; i < ctx->nr_fields; i++) {
	58	/* Skip allocated (but non-initialized) contexts */
	59	if (!ctx->fields[i].event_field.name)
	60	continue;
	61	if (!strcmp(ctx->fields[i].event_field.name, subname))
	62	return i;
	63	}
	64	return -1;
	65	}
	66	EXPORT_SYMBOL_GPL(lttng_get_context_index);
	67
	68	struct lttng_ctx_field lttng_get_context_field_from_index(struct lttng_ctx ctx,
	69	size_t index)
	70	{
	71	if (index >= ctx->nr_fields)
	72	return NULL;
	73	return &ctx->fields[index];
	74	}
	75	EXPORT_SYMBOL_GPL(lttng_get_context_field_from_index);
	76
	77	/*
	78	* Note: as we append context information, the pointer location may change.
	79	*/
	80	ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p)
	81	{
	82	struct lttng_ctx *ctx;
	83	ssize_t pos = -1;
	84
	85	if (!*ctx_p) {
	86	*ctx_p = kzalloc(sizeof(struct lttng_ctx), GFP_KERNEL);
	87	if (!*ctx_p)
	88	goto end;
	89	(*ctx_p)->largest_align = 1;
	90	}
	91	ctx = *ctx_p;
	92	if (ctx->nr_fields + 1 > ctx->allocated_fields) {
	93	struct lttng_ctx_field *new_fields;
	94
	95	ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
	96	new_fields = lttng_kvzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
	97	if (!new_fields)
	98	goto end;
	99	if (ctx->fields)
	100	memcpy(new_fields, ctx->fields, sizeof(ctx->fields) ctx->nr_fields);
	101	lttng_kvfree(ctx->fields);
	102	ctx->fields = new_fields;
	103	}
	104	pos = ctx->nr_fields++;
	105	end:
	106	return pos;
	107	}
	108	EXPORT_SYMBOL_GPL(lttng_append_context_index);
	109
	110	/*
	111	* Note: as we append context information, the pointer location may change.
	112	*/
	113	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx_p)
	114	{
	115	ssize_t pos;
	116
	117	pos = lttng_append_context_index(ctx_p);
	118	if (pos < 0)
	119	return NULL;
	120	return &(*ctx_p)->fields[pos];
	121	}
	122	EXPORT_SYMBOL_GPL(lttng_append_context);
	123
	124	/*
	125	* lttng_context_update() should be called at least once between context
	126	* modification and trace start.
	127	*/
	128	void lttng_context_update(struct lttng_ctx *ctx)
	129	{
	130	int i;
	131	size_t largest_align = 8; /* in bits */
	132
	133	for (i = 0; i < ctx->nr_fields; i++) {
	134	struct lttng_type *type;
	135	size_t field_align = 8;
	136
	137	type = &ctx->fields[i].event_field.type;
	138	switch (type->atype) {
	139	case atype_integer:
	140	field_align = type->u.integer.alignment;
	141	break;
	142	case atype_array_nestable:
	143	{
	144	const struct lttng_type *nested_type;
	145
	146	nested_type = type->u.array_nestable.elem_type;
	147	switch (nested_type->atype) {
	148	case atype_integer:
	149	field_align = nested_type->u.integer.alignment;
	150	break;
	151	case atype_string:
	152	break;
	153
	154	case atype_array_nestable:
	155	case atype_sequence_nestable:
	156	case atype_struct_nestable:
	157	case atype_variant_nestable:
	158	default:
	159	WARN_ON_ONCE(1);
	160	break;
	161	}
	162	field_align = max_t(size_t, field_align,
	163	type->u.array_nestable.alignment);
	164	break;
	165	}
	166	case atype_sequence_nestable:
	167	{
	168	const struct lttng_type *nested_type;
	169
	170	nested_type = type->u.sequence_nestable.elem_type;
	171	switch (nested_type->atype) {
	172	case atype_integer:
	173	field_align = nested_type->u.integer.alignment;
	174	break;
	175
	176	case atype_string:
	177	break;
	178
	179	case atype_array_nestable:
	180	case atype_sequence_nestable:
	181	case atype_struct_nestable:
	182	case atype_variant_nestable:
	183	default:
	184	WARN_ON_ONCE(1);
	185	break;
	186	}
	187	field_align = max_t(size_t, field_align,
	188	type->u.sequence_nestable.alignment);
	189	break;
	190	}
	191	case atype_string:
	192	break;
	193
	194	case atype_struct_nestable:
	195	case atype_variant_nestable:
	196	break;
	197
	198	case atype_enum_nestable:
	199	default:
	200	WARN_ON_ONCE(1);
	201	break;
	202	}
	203	largest_align = max_t(size_t, largest_align, field_align);
	204	}
	205	ctx->largest_align = largest_align >> 3; /* bits to bytes */
	206	}
	207
	208	/* Keep same order. */
	209	void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index)
	210	{
	211	struct lttng_ctx ctx = ctx_p;
	212
	213	WARN_ON_ONCE(ctx->nr_fields >= index);
	214	if (index != ctx->nr_fields - 1) {
	215	memmove(&ctx->fields[index], &ctx->fields[index + 1],
	216	(ctx->nr_fields - index - 1) * sizeof(struct lttng_ctx_field));
	217	}
	218	/* Clear last item. */
	219	memset(&ctx->fields[ctx->nr_fields - 1], 0, sizeof(struct lttng_ctx_field));
	220	ctx->nr_fields--;
	221	}
	222	EXPORT_SYMBOL_GPL(lttng_remove_context_field_index);
	223
	224	/*
	225	* Remove last context field.
	226	*/
	227	void lttng_remove_context_field(struct lttng_ctx **ctx_p,
	228	struct lttng_ctx_field *field)
	229	{
	230	struct lttng_ctx *ctx;
	231
	232	ctx = *ctx_p;
	233	ctx->nr_fields--;
	234	WARN_ON_ONCE(&ctx->fields[ctx->nr_fields] != field);
	235	memset(&ctx->fields[ctx->nr_fields], 0, sizeof(struct lttng_ctx_field));
	236	}
	237	EXPORT_SYMBOL_GPL(lttng_remove_context_field);
	238
	239	void lttng_destroy_context(struct lttng_ctx *ctx)
	240	{
	241	int i;
	242
	243	if (!ctx)
	244	return;
	245	for (i = 0; i < ctx->nr_fields; i++) {
	246	if (ctx->fields[i].destroy)
	247	ctx->fields[i].destroy(&ctx->fields[i]);
	248	}
	249	lttng_kvfree(ctx->fields);
	250	kfree(ctx);
	251	}
	252
	253	int lttng_context_init(void)
	254	{
	255	int ret;
	256
	257	ret = lttng_add_hostname_to_ctx(&lttng_static_ctx);
	258	if (ret) {
	259	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_hostname_to_ctx");
	260	}
	261	ret = lttng_add_nice_to_ctx(&lttng_static_ctx);
	262	if (ret) {
	263	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_nice_to_ctx");
	264	}
	265	ret = lttng_add_pid_to_ctx(&lttng_static_ctx);
	266	if (ret) {
	267	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_pid_to_ctx");
	268	}
	269	ret = lttng_add_ppid_to_ctx(&lttng_static_ctx);
	270	if (ret) {
	271	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_ppid_to_ctx");
	272	}
	273	ret = lttng_add_prio_to_ctx(&lttng_static_ctx);
	274	if (ret) {
	275	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_prio_to_ctx");
	276	}
	277	ret = lttng_add_procname_to_ctx(&lttng_static_ctx);
	278	if (ret) {
	279	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_procname_to_ctx");
	280	}
	281	ret = lttng_add_tid_to_ctx(&lttng_static_ctx);
	282	if (ret) {
	283	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_tid_to_ctx");
	284	}
	285	ret = lttng_add_vppid_to_ctx(&lttng_static_ctx);
	286	if (ret) {
	287	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_vppid_to_ctx");
	288	}
	289	ret = lttng_add_vtid_to_ctx(&lttng_static_ctx);
	290	if (ret) {
	291	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_vtid_to_ctx");
	292	}
	293	ret = lttng_add_vpid_to_ctx(&lttng_static_ctx);
	294	if (ret) {
	295	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_vpid_to_ctx");
	296	}
	297	ret = lttng_add_cpu_id_to_ctx(&lttng_static_ctx);
	298	if (ret) {
	299	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_cpu_id_to_ctx");
	300	}
	301	ret = lttng_add_interruptible_to_ctx(&lttng_static_ctx);
	302	if (ret) {
	303	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_interruptible_to_ctx");
	304	}
	305	ret = lttng_add_need_reschedule_to_ctx(&lttng_static_ctx);
	306	if (ret) {
	307	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_need_reschedule_to_ctx");
	308	}
	309	ret = lttng_add_preemptible_to_ctx(&lttng_static_ctx);
	310	if (ret && ret != -ENOSYS) {
	311	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_preemptible_to_ctx");
	312	}
	313	ret = lttng_add_migratable_to_ctx(&lttng_static_ctx);
	314	if (ret && ret != -ENOSYS) {
	315	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_migratable_to_ctx");
	316	}
	317	ret = lttng_add_cgroup_ns_to_ctx(&lttng_static_ctx);
	318	if (ret && ret != -ENOSYS) {
	319	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_cgroup_ns_to_ctx");
	320	}
	321	ret = lttng_add_ipc_ns_to_ctx(&lttng_static_ctx);
	322	if (ret && ret != -ENOSYS) {
	323	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_ipc_ns_to_ctx");
	324	}
	325	ret = lttng_add_mnt_ns_to_ctx(&lttng_static_ctx);
	326	if (ret && ret != -ENOSYS) {
	327	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_mnt_ns_to_ctx");
	328	}
	329	ret = lttng_add_net_ns_to_ctx(&lttng_static_ctx);
	330	if (ret && ret != -ENOSYS) {
	331	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_net_ns_to_ctx");
	332	}
	333	ret = lttng_add_pid_ns_to_ctx(&lttng_static_ctx);
	334	if (ret && ret != -ENOSYS) {
	335	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_pid_ns_to_ctx");
	336	}
	337	ret = lttng_add_user_ns_to_ctx(&lttng_static_ctx);
	338	if (ret && ret != -ENOSYS) {
	339	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_user_ns_to_ctx");
	340	}
	341	ret = lttng_add_uts_ns_to_ctx(&lttng_static_ctx);
	342	if (ret && ret != -ENOSYS) {
	343	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_uts_ns_to_ctx");
	344	}
	345	ret = lttng_add_time_ns_to_ctx(&lttng_static_ctx);
	346	if (ret && ret != -ENOSYS) {
	347	printk(KERN_WARNING "LTTng: Cannot add context lttng_add_time_ns_to_ctx");
	348	}
	349	/* TODO: perf counters for filtering */
	350	return 0;
	351	}
	352
	353	void lttng_context_exit(void)
	354	{
	355	lttng_destroy_context(lttng_static_ctx);
	356	lttng_static_ctx = NULL;
	357	}