Introduce lazy system call event creation

[lttng-modules.git] / include / lttng / events.h

diff --git a/include/lttng/events.h b/include/lttng/events.h
index 7b3b18571184fb0ee1d9717277800d42f20ce06e..7fa41ac18d1664b7d409cd287d7202cd6af53418 100644 (file)
--- a/include/lttng/events.h
+++ b/include/lttng/events.h
@@ -338,6 +338,7 @@ struct lttng_event {
                struct {
                        enum lttng_syscall_entryexit entryexit;
                        enum lttng_syscall_abi abi;
+                       struct hlist_node node;                 /* chain registered syscall event */
                } syscall;
        } u;
        struct list_head list;          /* Event list in session */
@@ -356,6 +357,7 @@ struct lttng_event {
 struct lttng_event_notifier {
        enum lttng_event_type evtype;   /* First field. */
        uint64_t user_token;
+       uint64_t error_counter_index;
        int enabled;
        int registered;                 /* has reg'd tracepoint probe */
        const struct lttng_event_desc *desc;
@@ -426,6 +428,7 @@ struct lttng_event_enabler {
 
 struct lttng_event_notifier_enabler {
        struct lttng_enabler base;
+       uint64_t error_counter_index;
        struct list_head node;  /* List of event_notifier enablers */
        struct lttng_event_notifier_group *group;
 
@@ -576,18 +579,19 @@ struct lttng_channel {
        struct list_head list;          /* Channel list */
        struct lttng_channel_ops *ops;
        struct lttng_transport *transport;
-       struct lttng_event **sc_table;  /* for syscall tracing */
-       struct lttng_event **compat_sc_table;
-       struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
-       struct lttng_event **compat_sc_exit_table;
-       struct lttng_event *sc_unknown; /* for unknown syscalls */
-       struct lttng_event *sc_compat_unknown;
-       struct lttng_event *sc_exit_unknown;
-       struct lttng_event *compat_sc_exit_unknown;
+       struct hlist_head *sc_table;    /* for syscall tracing */
+       struct hlist_head *compat_sc_table;
+       struct hlist_head *sc_exit_table;       /* for syscall exit tracing */
+       struct hlist_head *compat_sc_exit_table;
+       struct hlist_head sc_unknown;   /* for unknown syscalls */
+       struct hlist_head sc_compat_unknown;
+       struct hlist_head sc_exit_unknown;
+       struct hlist_head compat_sc_exit_unknown;
        struct lttng_syscall_filter *sc_filter;
        int header_type;                /* 0: unset, 1: compact, 2: large */
        enum channel_type channel_type;
-       int syscall_all;
+       int syscall_all_entry;
+       int syscall_all_exit;
        unsigned int metadata_dumped:1,
                sys_enter_registered:1,
                sys_exit_registered:1,
@@ -675,6 +679,14 @@ struct lttng_session {
        char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 };
 
+struct lttng_counter {
+       struct file *file;              /* File associated to counter. */
+       struct file *owner;
+       struct lttng_counter_transport *transport;
+       struct lib_counter *counter;
+       struct lttng_counter_ops *ops;
+};
+
 struct lttng_event_notifier_group {
        struct file *file;              /* File associated to event notifier group */
        struct file *notif_file;        /* File used to expose notifications to userspace. */
@@ -759,7 +771,23 @@ int lttng_session_metadata_regenerate(struct lttng_session *session);
 int lttng_session_statedump(struct lttng_session *session);
 void metadata_cache_destroy(struct kref *kref);
 
+struct lttng_counter *lttng_kernel_counter_create(
+               const char *counter_transport_name, size_t number_dimensions,
+               const size_t *dimensions_sizes);
+int lttng_kernel_counter_read(struct lttng_counter *counter,
+               const size_t *dimension_indexes, int32_t cpu,
+               int64_t *val, bool *overflow, bool *underflow);
+int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
+               const size_t *dimension_indexes, int64_t *val,
+               bool *overflow, bool *underflow);
+int lttng_kernel_counter_clear(struct lttng_counter *counter,
+               const size_t *dimension_indexes);
+
+
 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
+int lttng_event_notifier_group_create_error_counter(
+               struct file *event_notifier_group_file,
+               const struct lttng_kernel_counter_conf *error_counter_conf);
 void lttng_event_notifier_group_destroy(
                struct lttng_event_notifier_group *event_notifier_group);
 
@@ -795,6 +823,7 @@ struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 struct lttng_event_notifier *lttng_event_notifier_create(
                                const struct lttng_event_desc *event_notifier_desc,
                                uint64_t id,
+                               uint64_t error_counter_idx,
                                struct lttng_event_notifier_group *event_notifier_group,
                                struct lttng_kernel_event_notifier *event_notifier_param,
                                void *filter,
@@ -802,6 +831,7 @@ struct lttng_event_notifier *lttng_event_notifier_create(
 struct lttng_event_notifier *_lttng_event_notifier_create(
                                const struct lttng_event_desc *event_notifier_desc,
                                uint64_t id,
+                               uint64_t error_counter_idx,
                                struct lttng_event_notifier_group *event_notifier_group,
                                struct lttng_kernel_event_notifier *event_notifier_param,
                                void *filter,
@@ -859,8 +889,8 @@ int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
                struct lttng_enabler *enabler);
 
 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
-int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
-int lttng_syscalls_unregister_event(struct lttng_channel *chan);
+int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler, void *filter);
+int lttng_syscalls_unregister_channel(struct lttng_channel *chan);
 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 int lttng_syscall_filter_enable_event(
                struct lttng_channel *chan,
@@ -877,17 +907,17 @@ int lttng_syscalls_register_event_notifier(
                void *filter);
 int lttng_syscals_create_matching_event_notifiers(
                struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
-int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
+int lttng_syscalls_unregister_event_notifier_group(struct lttng_event_notifier_group *group);
 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 #else
 static inline int lttng_syscalls_register_event(
-               struct lttng_channel *chan, void *filter)
+               struct lttng_event_enabler *event_enabler, void *filter)
 {
        return -ENOSYS;
 }
 
-static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
+static inline int lttng_syscalls_unregister_channel(struct lttng_channel *chan)
 {
        return 0;
 }
@@ -921,7 +951,7 @@ static inline int lttng_syscalls_register_event_notifier(
        return -ENOSYS;
 }
 
-static inline int lttng_syscalls_unregister_event_notifier(
+static inline int lttng_syscalls_unregister_event_notifier_group(
                struct lttng_event_notifier_group *group)
 {
        return 0;