[lttng-modules.git] / 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;

	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);

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

	if (!*ctx_p) {
		*ctx_p = kzalloc(sizeof(struct lttng_ctx), GFP_KERNEL);
		if (!*ctx_p)
			return NULL;
		(*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)
			return NULL;
		if (ctx->fields)
			memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields);
		lttng_kvfree(ctx->fields);
		ctx->fields = new_fields;
	}
	field = &ctx->fields[ctx->nr_fields];
	ctx->nr_fields++;
	return field;
}
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 */
}

/*
 * 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 "Cannot add context lttng_add_hostname_to_ctx");
	}
	ret = lttng_add_nice_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_nice_to_ctx");
	}
	ret = lttng_add_pid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_pid_to_ctx");
	}
	ret = lttng_add_ppid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_ppid_to_ctx");
	}
	ret = lttng_add_prio_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_prio_to_ctx");
	}
	ret = lttng_add_procname_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
	}
	ret = lttng_add_tid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_tid_to_ctx");
	}
	ret = lttng_add_vppid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_vppid_to_ctx");
	}
	ret = lttng_add_vtid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_vtid_to_ctx");
	}
	ret = lttng_add_vpid_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_vpid_to_ctx");
	}
	ret = lttng_add_cpu_id_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_cpu_id_to_ctx");
	}
	ret = lttng_add_interruptible_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "Cannot add context lttng_add_interruptible_to_ctx");
	}
	ret = lttng_add_need_reschedule_to_ctx(&lttng_static_ctx);
	if (ret) {
		printk(KERN_WARNING "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 "Cannot add context lttng_add_preemptible_to_ctx");
	}
	ret = lttng_add_migratable_to_ctx(&lttng_static_ctx);
	if (ret && ret != -ENOSYS) {
		printk(KERN_WARNING "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 "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 "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 "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 "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 "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 "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 "Cannot add context lttng_add_uts_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
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed	2	*
a90917c3	3	* lttng-context.c
2dccf128	4	*
2dccf128	5	* LTTng trace/channel/event context management.
17baffe2	6	*
886d51a3	7	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2dccf128 MD	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/list.h>
	12	#include <linux/mutex.h>
	13	#include <linux/slab.h>
263b6c88	14	#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
241ae9a8 MD	15	#include <lttng-events.h>
241ae9a8 MD	16	#include <lttng-tracer.h>
2dccf128	17
07dfc1d0 MD	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 $ctx filters.
	25	*/
	26	struct lttng_ctx *lttng_static_ctx;
	27
44252f0f MD	28	int lttng_find_context(struct lttng_ctx ctx, const char name)
	29	{
	30	unsigned int i;
	31
	32	for (i = 0; i < ctx->nr_fields; i++) {
4b58a8e4 MD	33	/* Skip allocated (but non-initialized) contexts */
	34	if (!ctx->fields[i].event_field.name)
	35	continue;
44252f0f MD	36	if (!strcmp(ctx->fields[i].event_field.name, name))
	37	return 1;
	38	}
	39	return 0;
	40	}
	41	EXPORT_SYMBOL_GPL(lttng_find_context);
	42
07dfc1d0 MD	43	int lttng_get_context_index(struct lttng_ctx ctx, const char name)
	44	{
	45	unsigned int i;
0451bcec	46	const char *subname;
07dfc1d0 MD	47
	48	if (!ctx)
	49	return -1;
0451bcec MD	50	if (strncmp(name, "$ctx.", strlen("$ctx.")) == 0) {
	51	subname = name + strlen("$ctx.");
	52	} else {
	53	subname = name;
	54	}
07dfc1d0 MD	55	for (i = 0; i < ctx->nr_fields; i++) {
	56	/* Skip allocated (but non-initialized) contexts */
	57	if (!ctx->fields[i].event_field.name)
	58	continue;
0451bcec	59	if (!strcmp(ctx->fields[i].event_field.name, subname))
07dfc1d0 MD	60	return i;
	61	}
	62	return -1;
	63	}
	64	EXPORT_SYMBOL_GPL(lttng_get_context_index);
	65
2001023e MD	66	/*
	67	* Note: as we append context information, the pointer location may change.
	68	*/
2dccf128 MD	69	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx_p)
	70	{
	71	struct lttng_ctx_field *field;
	72	struct lttng_ctx *ctx;
	73
	74	if (!*ctx_p) {
	75	*ctx_p = kzalloc(sizeof(struct lttng_ctx), GFP_KERNEL);
	76	if (!*ctx_p)
	77	return NULL;
a9dd15da	78	(*ctx_p)->largest_align = 1;
2dccf128 MD	79	}
	80	ctx = *ctx_p;
	81	if (ctx->nr_fields + 1 > ctx->allocated_fields) {
	82	struct lttng_ctx_field *new_fields;
	83
0f034e0f	84	ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
48f5e0b5	85	new_fields = lttng_kvzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
2dccf128 MD	86	if (!new_fields)
	87	return NULL;
	88	if (ctx->fields)
77aefe99	89	memcpy(new_fields, ctx->fields, sizeof(ctx->fields) ctx->nr_fields);
48f5e0b5	90	lttng_kvfree(ctx->fields);
2dccf128 MD	91	ctx->fields = new_fields;
	92	}
	93	field = &ctx->fields[ctx->nr_fields];
	94	ctx->nr_fields++;
	95	return field;
	96	}
	97	EXPORT_SYMBOL_GPL(lttng_append_context);
	98
a9dd15da MD	99	/*
	100	* lttng_context_update() should be called at least once between context
	101	* modification and trace start.
	102	*/
	103	void lttng_context_update(struct lttng_ctx *ctx)
	104	{
	105	int i;
	106	size_t largest_align = 8; /* in bits */
	107
	108	for (i = 0; i < ctx->nr_fields; i++) {
	109	struct lttng_type *type;
	110	size_t field_align = 8;
	111
	112	type = &ctx->fields[i].event_field.type;
	113	switch (type->atype) {
	114	case atype_integer:
ceabb767	115	field_align = type->u.integer.alignment;
a9dd15da	116	break;
ceabb767	117	case atype_array_nestable:
a9dd15da	118	{
ceabb767	119	const struct lttng_type *nested_type;
a9dd15da	120
ceabb767 MD	121	nested_type = type->u.array_nestable.elem_type;
ceabb767 MD	122	switch (nested_type->atype) {
a9dd15da	123	case atype_integer:
ceabb767	124	field_align = nested_type->u.integer.alignment;
a9dd15da MD	125	break;
	126	case atype_string:
	127	break;
	128
ceabb767 MD	129	case atype_array_nestable:
	130	case atype_sequence_nestable:
	131	case atype_struct_nestable:
	132	case atype_variant_nestable:
a9dd15da MD	133	default:
	134	WARN_ON_ONCE(1);
	135	break;
	136	}
ceabb767 MD	137	field_align = max_t(size_t, field_align,
ceabb767 MD	138	type->u.array_nestable.alignment);
a9dd15da MD	139	break;
a9dd15da MD	140	}
ceabb767	141	case atype_sequence_nestable:
a9dd15da	142	{
ceabb767	143	const struct lttng_type *nested_type;
a9dd15da	144
ceabb767 MD	145	nested_type = type->u.sequence_nestable.elem_type;
ceabb767 MD	146	switch (nested_type->atype) {
a9dd15da	147	case atype_integer:
ceabb767	148	field_align = nested_type->u.integer.alignment;
a9dd15da MD	149	break;
	150
	151	case atype_string:
	152	break;
	153
ceabb767 MD	154	case atype_array_nestable:
	155	case atype_sequence_nestable:
	156	case atype_struct_nestable:
	157	case atype_variant_nestable:
a9dd15da MD	158	default:
	159	WARN_ON_ONCE(1);
	160	break;
	161	}
ceabb767 MD	162	field_align = max_t(size_t, field_align,
ceabb767 MD	163	type->u.sequence_nestable.alignment);
a9dd15da MD	164	break;
	165	}
	166	case atype_string:
	167	break;
	168
ceabb767 MD	169	case atype_struct_nestable:
ceabb767 MD	170	case atype_variant_nestable:
f513b2bf MD	171	break;
f513b2bf MD	172
ceabb767	173	case atype_enum_nestable:
a9dd15da MD	174	default:
	175	WARN_ON_ONCE(1);
	176	break;
	177	}
	178	largest_align = max_t(size_t, largest_align, field_align);
	179	}
	180	ctx->largest_align = largest_align >> 3; /* bits to bytes */
	181	}
	182
4cae220c MD	183	/*
	184	* Remove last context field.
	185	*/
8289661d MD	186	void lttng_remove_context_field(struct lttng_ctx **ctx_p,
	187	struct lttng_ctx_field *field)
	188	{
	189	struct lttng_ctx *ctx;
	190
	191	ctx = *ctx_p;
	192	ctx->nr_fields--;
4cae220c	193	WARN_ON_ONCE(&ctx->fields[ctx->nr_fields] != field);
8289661d MD	194	memset(&ctx->fields[ctx->nr_fields], 0, sizeof(struct lttng_ctx_field));
	195	}
	196	EXPORT_SYMBOL_GPL(lttng_remove_context_field);
	197
2dccf128 MD	198	void lttng_destroy_context(struct lttng_ctx *ctx)
	199	{
	200	int i;
	201
8070f5c0 MD	202	if (!ctx)
8070f5c0 MD	203	return;
9e7e4892 MD	204	for (i = 0; i < ctx->nr_fields; i++) {
	205	if (ctx->fields[i].destroy)
	206	ctx->fields[i].destroy(&ctx->fields[i]);
	207	}
48f5e0b5	208	lttng_kvfree(ctx->fields);
2dccf128 MD	209	kfree(ctx);
2dccf128 MD	210	}
07dfc1d0 MD	211
	212	int lttng_context_init(void)
	213	{
	214	int ret;
	215
f127e61e MD	216	ret = lttng_add_hostname_to_ctx(&lttng_static_ctx);
f127e61e MD	217	if (ret) {
38c4a82c	218	printk(KERN_WARNING "Cannot add context lttng_add_hostname_to_ctx");
f127e61e MD	219	}
f127e61e MD	220	ret = lttng_add_nice_to_ctx(&lttng_static_ctx);
07dfc1d0	221	if (ret) {
38c4a82c	222	printk(KERN_WARNING "Cannot add context lttng_add_nice_to_ctx");
07dfc1d0	223	}
07dfc1d0 MD	224	ret = lttng_add_pid_to_ctx(&lttng_static_ctx);
07dfc1d0 MD	225	if (ret) {
38c4a82c	226	printk(KERN_WARNING "Cannot add context lttng_add_pid_to_ctx");
07dfc1d0	227	}
f127e61e	228	ret = lttng_add_ppid_to_ctx(&lttng_static_ctx);
07dfc1d0	229	if (ret) {
38c4a82c	230	printk(KERN_WARNING "Cannot add context lttng_add_ppid_to_ctx");
07dfc1d0 MD	231	}
	232	ret = lttng_add_prio_to_ctx(&lttng_static_ctx);
	233	if (ret) {
38c4a82c	234	printk(KERN_WARNING "Cannot add context lttng_add_prio_to_ctx");
07dfc1d0	235	}
f127e61e	236	ret = lttng_add_procname_to_ctx(&lttng_static_ctx);
07dfc1d0	237	if (ret) {
38c4a82c	238	printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
07dfc1d0 MD	239	}
	240	ret = lttng_add_tid_to_ctx(&lttng_static_ctx);
	241	if (ret) {
38c4a82c	242	printk(KERN_WARNING "Cannot add context lttng_add_tid_to_ctx");
07dfc1d0	243	}
f127e61e	244	ret = lttng_add_vppid_to_ctx(&lttng_static_ctx);
07dfc1d0	245	if (ret) {
38c4a82c	246	printk(KERN_WARNING "Cannot add context lttng_add_vppid_to_ctx");
07dfc1d0	247	}
f127e61e	248	ret = lttng_add_vtid_to_ctx(&lttng_static_ctx);
07dfc1d0	249	if (ret) {
38c4a82c	250	printk(KERN_WARNING "Cannot add context lttng_add_vtid_to_ctx");
07dfc1d0	251	}
f127e61e	252	ret = lttng_add_vpid_to_ctx(&lttng_static_ctx);
07dfc1d0	253	if (ret) {
38c4a82c	254	printk(KERN_WARNING "Cannot add context lttng_add_vpid_to_ctx");
07dfc1d0	255	}
b3699d90 MD	256	ret = lttng_add_cpu_id_to_ctx(&lttng_static_ctx);
	257	if (ret) {
	258	printk(KERN_WARNING "Cannot add context lttng_add_cpu_id_to_ctx");
	259	}
79150a49 JD	260	ret = lttng_add_interruptible_to_ctx(&lttng_static_ctx);
	261	if (ret) {
	262	printk(KERN_WARNING "Cannot add context lttng_add_interruptible_to_ctx");
	263	}
	264	ret = lttng_add_need_reschedule_to_ctx(&lttng_static_ctx);
	265	if (ret) {
	266	printk(KERN_WARNING "Cannot add context lttng_add_need_reschedule_to_ctx");
	267	}
79150a49	268	ret = lttng_add_preemptible_to_ctx(&lttng_static_ctx);
d0e59d6f	269	if (ret && ret != -ENOSYS) {
79150a49 JD	270	printk(KERN_WARNING "Cannot add context lttng_add_preemptible_to_ctx");
79150a49 JD	271	}
79150a49	272	ret = lttng_add_migratable_to_ctx(&lttng_static_ctx);
d0e59d6f	273	if (ret && ret != -ENOSYS) {
79150a49 JD	274	printk(KERN_WARNING "Cannot add context lttng_add_migratable_to_ctx");
79150a49 JD	275	}
a6cf40a4 MJ	276	ret = lttng_add_cgroup_ns_to_ctx(&lttng_static_ctx);
	277	if (ret && ret != -ENOSYS) {
	278	printk(KERN_WARNING "Cannot add context lttng_add_cgroup_ns_to_ctx");
	279	}
	280	ret = lttng_add_ipc_ns_to_ctx(&lttng_static_ctx);
	281	if (ret && ret != -ENOSYS) {
	282	printk(KERN_WARNING "Cannot add context lttng_add_ipc_ns_to_ctx");
	283	}
	284	ret = lttng_add_mnt_ns_to_ctx(&lttng_static_ctx);
	285	if (ret && ret != -ENOSYS) {
	286	printk(KERN_WARNING "Cannot add context lttng_add_mnt_ns_to_ctx");
	287	}
	288	ret = lttng_add_net_ns_to_ctx(&lttng_static_ctx);
	289	if (ret && ret != -ENOSYS) {
	290	printk(KERN_WARNING "Cannot add context lttng_add_net_ns_to_ctx");
	291	}
	292	ret = lttng_add_pid_ns_to_ctx(&lttng_static_ctx);
	293	if (ret && ret != -ENOSYS) {
	294	printk(KERN_WARNING "Cannot add context lttng_add_pid_ns_to_ctx");
	295	}
	296	ret = lttng_add_user_ns_to_ctx(&lttng_static_ctx);
	297	if (ret && ret != -ENOSYS) {
	298	printk(KERN_WARNING "Cannot add context lttng_add_user_ns_to_ctx");
	299	}
	300	ret = lttng_add_uts_ns_to_ctx(&lttng_static_ctx);
	301	if (ret && ret != -ENOSYS) {
	302	printk(KERN_WARNING "Cannot add context lttng_add_uts_ns_to_ctx");
	303	}
f127e61e	304	/* TODO: perf counters for filtering */
07dfc1d0 MD	305	return 0;
	306	}
	307
	308	void lttng_context_exit(void)
	309	{
	310	lttng_destroy_context(lttng_static_ctx);
	311	lttng_static_ctx = NULL;
	312	}