-/*
- * lttng-context.c
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
*
- * Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * lttng-context.c
*
* LTTng trace/channel/event context management.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * 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_all() */
-#include "lttng-events.h"
-#include "lttng-tracer.h"
+#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
+#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 $ctx filters.
+ */
+struct lttng_ctx *lttng_static_ctx;
int lttng_find_context(struct lttng_ctx *ctx, const char *name)
{
}
EXPORT_SYMBOL_GPL(lttng_find_context);
+int lttng_get_context_index(struct lttng_ctx *ctx, const char *name)
+{
+ unsigned int i;
+ const char *subname;
+
+ if (!ctx)
+ return -1;
+ if (strncmp(name, "$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.
*/
*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 = kzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
+ 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);
- kfree(ctx->fields);
+ lttng_kvfree(ctx->fields);
ctx->fields = new_fields;
}
field = &ctx->fields[ctx->nr_fields];
}
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.basic.integer.alignment;
+ break;
+ case atype_array:
+ case atype_array_bitfield:
+ {
+ struct lttng_basic_type *btype;
+
+ btype = &type->u.array.elem_type;
+ switch (btype->atype) {
+ case atype_integer:
+ field_align = btype->u.basic.integer.alignment;
+ break;
+ case atype_string:
+ break;
+
+ case atype_array:
+ case atype_sequence:
+ case atype_array_bitfield:
+ case atype_sequence_bitfield:
+ case atype_struct:
+ case atype_array_compound:
+ case atype_sequence_compound:
+ case atype_variant:
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+ break;
+ }
+ case atype_sequence:
+ case atype_sequence_bitfield:
+ {
+ struct lttng_basic_type *btype;
+
+ btype = &type->u.sequence.length_type;
+ switch (btype->atype) {
+ case atype_integer:
+ field_align = btype->u.basic.integer.alignment;
+ break;
+
+ case atype_string:
+ case atype_array:
+ case atype_sequence:
+ case atype_array_bitfield:
+ case atype_sequence_bitfield:
+ case atype_struct:
+ case atype_array_compound:
+ case atype_sequence_compound:
+ case atype_variant:
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ btype = &type->u.sequence.elem_type;
+ switch (btype->atype) {
+ case atype_integer:
+ field_align = max_t(size_t,
+ field_align,
+ btype->u.basic.integer.alignment);
+ break;
+
+ case atype_string:
+ break;
+
+ case atype_array:
+ case atype_sequence:
+ case atype_array_bitfield:
+ case atype_sequence_bitfield:
+ case atype_struct:
+ case atype_array_compound:
+ case atype_sequence_compound:
+ case atype_variant:
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+ break;
+ }
+ case atype_string:
+ break;
+
+ case atype_struct:
+ case atype_array_compound:
+ case atype_sequence_compound:
+ case atype_variant:
+ break;
+
+ case atype_enum:
+ 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.
*/
if (ctx->fields[i].destroy)
ctx->fields[i].destroy(&ctx->fields[i]);
}
- kfree(ctx->fields);
+ lttng_kvfree(ctx->fields);
kfree(ctx);
}
+
+int lttng_context_init(void)
+{
+ int ret;
+
+ ret = lttng_add_hostname_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_hostname_to_ctx");
+ }
+ ret = lttng_add_nice_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_nice_to_ctx");
+ }
+ ret = lttng_add_pid_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_pid_to_ctx");
+ }
+ ret = lttng_add_ppid_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_ppid_to_ctx");
+ }
+ ret = lttng_add_prio_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_prio_to_ctx");
+ }
+ ret = lttng_add_procname_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+ }
+ ret = lttng_add_tid_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_tid_to_ctx");
+ }
+ ret = lttng_add_vppid_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_vppid_to_ctx");
+ }
+ ret = lttng_add_vtid_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_vtid_to_ctx");
+ }
+ ret = lttng_add_vpid_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_vpid_to_ctx");
+ }
+ ret = lttng_add_cpu_id_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_cpu_id_to_ctx");
+ }
+ ret = lttng_add_interruptible_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_interruptible_to_ctx");
+ }
+ ret = lttng_add_need_reschedule_to_ctx(<tng_static_ctx);
+ if (ret) {
+ printk(KERN_WARNING "Cannot add context lttng_add_need_reschedule_to_ctx");
+ }
+ ret = lttng_add_preemptible_to_ctx(<tng_static_ctx);
+ if (ret && ret != -ENOSYS) {
+ printk(KERN_WARNING "Cannot add context lttng_add_preemptible_to_ctx");
+ }
+ ret = lttng_add_migratable_to_ctx(<tng_static_ctx);
+ if (ret && ret != -ENOSYS) {
+ printk(KERN_WARNING "Cannot add context lttng_add_migratable_to_ctx");
+ }
+ /* TODO: perf counters for filtering */
+ return 0;
+}
+
+void lttng_context_exit(void)
+{
+ lttng_destroy_context(lttng_static_ctx);
+ lttng_static_ctx = NULL;
+}
projects / lttng-modules.git / blobdiff