From: Mathieu Desnoyers Date: Mon, 3 May 2021 16:46:04 +0000 (-0400) Subject: Split ID tracker into public/private structures X-Git-Tag: v2.13.0-rc2~40 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=a2fa977a83704ebb579b8a0f31ed14c10b3c3e4d;p=lttng-modules.git Split ID tracker into public/private structures Signed-off-by: Mathieu Desnoyers Change-Id: Ic17da38eb96d734110b59656d0fedce1bacd570a --- diff --git a/include/lttng/events-internal.h b/include/lttng/events-internal.h index 17719887..869ea70d 100644 --- a/include/lttng/events-internal.h +++ b/include/lttng/events-internal.h @@ -415,6 +415,24 @@ struct lttng_id_hash_node { int id; }; +enum tracker_type { + TRACKER_PID, + TRACKER_VPID, + TRACKER_UID, + TRACKER_VUID, + TRACKER_GID, + TRACKER_VGID, + + TRACKER_UNKNOWN, +}; + +struct lttng_kernel_id_tracker_private { + struct lttng_kernel_id_tracker *pub; /* Public interface */ + + struct lttng_kernel_session *session; + enum tracker_type tracker_type; +}; + extern struct lttng_kernel_ctx *lttng_static_ctx; static inline @@ -1062,10 +1080,14 @@ int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, struct channel *chan, bool *coherent); int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node); -int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf); -void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu); -int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id); -int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id); +int lttng_id_tracker_empty_set(struct lttng_kernel_id_tracker *lf); +int lttng_id_tracker_init(struct lttng_kernel_id_tracker *lf, + struct lttng_kernel_session *session, + enum tracker_type type); +void lttng_id_tracker_fini(struct lttng_kernel_id_tracker *lf); +void lttng_id_tracker_destroy(struct lttng_kernel_id_tracker *lf, bool rcu); +int lttng_id_tracker_add(struct lttng_kernel_id_tracker *lf, int id); +int lttng_id_tracker_del(struct lttng_kernel_id_tracker *lf, int id); int lttng_session_track_id(struct lttng_kernel_session *session, enum tracker_type tracker_type, int id); diff --git a/include/lttng/events.h b/include/lttng/events.h index c6c46b4a..157aaca7 100644 --- a/include/lttng/events.h +++ b/include/lttng/events.h @@ -445,31 +445,20 @@ struct lttng_dynamic_len_stack { DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack); /* - * struct lttng_id_tracker declared in header due to deferencing of *v + * struct lttng_kernel_id_tracker declared in header due to deferencing of *v * in RCU_INITIALIZER(v). */ #define LTTNG_ID_HASH_BITS 6 #define LTTNG_ID_TABLE_SIZE (1 << LTTNG_ID_HASH_BITS) -enum tracker_type { - TRACKER_PID, - TRACKER_VPID, - TRACKER_UID, - TRACKER_VUID, - TRACKER_GID, - TRACKER_VGID, - - TRACKER_UNKNOWN, -}; - -struct lttng_id_tracker_rcu { +struct lttng_kernel_id_tracker_rcu { struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE]; }; -struct lttng_id_tracker { - struct lttng_kernel_session *session; - enum tracker_type tracker_type; - struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */ +struct lttng_kernel_id_tracker { + struct lttng_kernel_id_tracker_private *priv; /* Private API */ + + struct lttng_kernel_id_tracker_rcu *p; /* RCU dereferenced. */ }; struct lttng_kernel_session_private; @@ -479,17 +468,17 @@ struct lttng_kernel_session { int active; /* Is trace session active ? */ - struct lttng_id_tracker pid_tracker; - struct lttng_id_tracker vpid_tracker; - struct lttng_id_tracker uid_tracker; - struct lttng_id_tracker vuid_tracker; - struct lttng_id_tracker gid_tracker; - struct lttng_id_tracker vgid_tracker; + struct lttng_kernel_id_tracker pid_tracker; + struct lttng_kernel_id_tracker vpid_tracker; + struct lttng_kernel_id_tracker uid_tracker; + struct lttng_kernel_id_tracker vuid_tracker; + struct lttng_kernel_id_tracker gid_tracker; + struct lttng_kernel_id_tracker vgid_tracker; }; int lttng_kernel_probe_register(struct lttng_kernel_probe_desc *desc); void lttng_kernel_probe_unregister(struct lttng_kernel_probe_desc *desc); -bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id); +bool lttng_id_tracker_lookup(struct lttng_kernel_id_tracker_rcu *p, int id); #endif /* _LTTNG_EVENTS_H */ diff --git a/include/lttng/tracepoint-event-impl.h b/include/lttng/tracepoint-event-impl.h index 83d65e6f..4df71ff2 100644 --- a/include/lttng/tracepoint-event-impl.h +++ b/include/lttng/tracepoint-event-impl.h @@ -1023,8 +1023,8 @@ static void __event_probe__##_name(_data_proto) \ struct lttng_kernel_event_recorder *__event_recorder = \ container_of(__event, struct lttng_kernel_event_recorder, parent); \ struct lttng_channel *__chan = __event_recorder->chan; \ - struct lttng_kernel_session *__session = __chan->session; \ - struct lttng_id_tracker_rcu *__lf; \ + struct lttng_kernel_session *__session = __chan->session; \ + struct lttng_kernel_id_tracker_rcu *__lf; \ \ if (!_TP_SESSION_CHECK(session, __session)) \ return; \ diff --git a/src/lttng-events.c b/src/lttng-events.c index 842beac1..2c007ad4 100644 --- a/src/lttng-events.c +++ b/src/lttng-events.c @@ -185,22 +185,30 @@ struct lttng_kernel_session *lttng_session_create(void) INIT_HLIST_HEAD(&session_priv->events_ht.table[i]); list_add(&session_priv->list, &sessions); - session->pid_tracker.session = session; - session->pid_tracker.tracker_type = TRACKER_PID; - session->vpid_tracker.session = session; - session->vpid_tracker.tracker_type = TRACKER_VPID; - session->uid_tracker.session = session; - session->uid_tracker.tracker_type = TRACKER_UID; - session->vuid_tracker.session = session; - session->vuid_tracker.tracker_type = TRACKER_VUID; - session->gid_tracker.session = session; - session->gid_tracker.tracker_type = TRACKER_GID; - session->vgid_tracker.session = session; - session->vgid_tracker.tracker_type = TRACKER_VGID; + if (lttng_id_tracker_init(&session->pid_tracker, session, TRACKER_PID)) + goto tracker_alloc_error; + if (lttng_id_tracker_init(&session->vpid_tracker, session, TRACKER_VPID)) + goto tracker_alloc_error; + if (lttng_id_tracker_init(&session->uid_tracker, session, TRACKER_UID)) + goto tracker_alloc_error; + if (lttng_id_tracker_init(&session->vuid_tracker, session, TRACKER_VUID)) + goto tracker_alloc_error; + if (lttng_id_tracker_init(&session->gid_tracker, session, TRACKER_GID)) + goto tracker_alloc_error; + if (lttng_id_tracker_init(&session->vgid_tracker, session, TRACKER_VGID)) + goto tracker_alloc_error; + mutex_unlock(&sessions_mutex); return session; +tracker_alloc_error: + lttng_id_tracker_fini(&session->pid_tracker); + lttng_id_tracker_fini(&session->vpid_tracker); + lttng_id_tracker_fini(&session->uid_tracker); + lttng_id_tracker_fini(&session->vuid_tracker); + lttng_id_tracker_fini(&session->gid_tracker); + lttng_id_tracker_fini(&session->vgid_tracker); err_free_cache: kfree(metadata_cache); err_free_session_private: @@ -376,12 +384,12 @@ void lttng_session_destroy(struct lttng_kernel_session *session) list_for_each_entry(metadata_stream, &session->priv->metadata_cache->metadata_stream, list) _lttng_metadata_channel_hangup(metadata_stream); mutex_unlock(&session->priv->metadata_cache->lock); - lttng_id_tracker_destroy(&session->pid_tracker, false); - lttng_id_tracker_destroy(&session->vpid_tracker, false); - lttng_id_tracker_destroy(&session->uid_tracker, false); - lttng_id_tracker_destroy(&session->vuid_tracker, false); - lttng_id_tracker_destroy(&session->gid_tracker, false); - lttng_id_tracker_destroy(&session->vgid_tracker, false); + lttng_id_tracker_fini(&session->pid_tracker); + lttng_id_tracker_fini(&session->vpid_tracker); + lttng_id_tracker_fini(&session->uid_tracker); + lttng_id_tracker_fini(&session->vuid_tracker); + lttng_id_tracker_fini(&session->gid_tracker); + lttng_id_tracker_fini(&session->vgid_tracker); kref_put(&session->priv->metadata_cache->refcount, metadata_cache_destroy); list_del(&session->priv->list); mutex_unlock(&sessions_mutex); @@ -1644,7 +1652,7 @@ void _lttng_event_destroy(struct lttng_kernel_event_common *event) } } -struct lttng_id_tracker *get_tracker(struct lttng_kernel_session *session, +struct lttng_kernel_id_tracker *get_tracker(struct lttng_kernel_session *session, enum tracker_type tracker_type) { switch (tracker_type) { @@ -1669,7 +1677,7 @@ struct lttng_id_tracker *get_tracker(struct lttng_kernel_session *session, int lttng_session_track_id(struct lttng_kernel_session *session, enum tracker_type tracker_type, int id) { - struct lttng_id_tracker *tracker; + struct lttng_kernel_id_tracker *tracker; int ret; tracker = get_tracker(session, tracker_type); @@ -1692,7 +1700,7 @@ int lttng_session_track_id(struct lttng_kernel_session *session, int lttng_session_untrack_id(struct lttng_kernel_session *session, enum tracker_type tracker_type, int id) { - struct lttng_id_tracker *tracker; + struct lttng_kernel_id_tracker *tracker; int ret; tracker = get_tracker(session, tracker_type); @@ -1714,8 +1722,8 @@ int lttng_session_untrack_id(struct lttng_kernel_session *session, static void *id_list_start(struct seq_file *m, loff_t *pos) { - struct lttng_id_tracker *id_tracker = m->private; - struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; + struct lttng_kernel_id_tracker *id_tracker = m->private; + struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; struct lttng_id_hash_node *e; int iter = 0, i; @@ -1744,8 +1752,8 @@ void *id_list_start(struct seq_file *m, loff_t *pos) static void *id_list_next(struct seq_file *m, void *p, loff_t *ppos) { - struct lttng_id_tracker *id_tracker = m->private; - struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; + struct lttng_kernel_id_tracker *id_tracker = m->private; + struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; struct lttng_id_hash_node *e; int iter = 0, i; @@ -1779,8 +1787,8 @@ void id_list_stop(struct seq_file *m, void *p) static int id_list_show(struct seq_file *m, void *p) { - struct lttng_id_tracker *id_tracker = m->private; - struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p; + struct lttng_kernel_id_tracker *id_tracker = m->private; + struct lttng_kernel_id_tracker_rcu *id_tracker_p = id_tracker->p; int id; if (p == id_tracker_p) { @@ -1791,7 +1799,7 @@ int id_list_show(struct seq_file *m, void *p) id = lttng_id_tracker_get_node_id(e); } - switch (id_tracker->tracker_type) { + switch (id_tracker->priv->tracker_type) { case TRACKER_PID: seq_printf(m, "process { pid = %d; };\n", id); break; @@ -1834,13 +1842,13 @@ static int lttng_tracker_ids_list_release(struct inode *inode, struct file *file) { struct seq_file *m = file->private_data; - struct lttng_id_tracker *id_tracker = m->private; + struct lttng_kernel_id_tracker *id_tracker = m->private; int ret; WARN_ON_ONCE(!id_tracker); ret = seq_release(inode, file); if (!ret) - fput(id_tracker->session->priv->file); + fput(id_tracker->priv->session->priv->file); return ret; } diff --git a/src/lttng-tracker-id.c b/src/lttng-tracker-id.c index 4fc23b85..8c1b008d 100644 --- a/src/lttng-tracker-id.c +++ b/src/lttng-tracker-id.c @@ -41,7 +41,7 @@ int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node) * protected by preemption off at the tracepoint call site. * Return true if found, false if not found. */ -bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id) +bool lttng_id_tracker_lookup(struct lttng_kernel_id_tracker_rcu *p, int id) { struct hlist_head *head; struct lttng_id_hash_node *e; @@ -56,11 +56,11 @@ bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id) } EXPORT_SYMBOL_GPL(lttng_id_tracker_lookup); -static struct lttng_id_tracker_rcu *lttng_id_tracker_rcu_create(void) +static struct lttng_kernel_id_tracker_rcu *lttng_id_tracker_rcu_create(void) { - struct lttng_id_tracker_rcu *tracker; + struct lttng_kernel_id_tracker_rcu *tracker; - tracker = kzalloc(sizeof(struct lttng_id_tracker_rcu), GFP_KERNEL); + tracker = kzalloc(sizeof(struct lttng_kernel_id_tracker_rcu), GFP_KERNEL); if (!tracker) return NULL; return tracker; @@ -69,11 +69,11 @@ static struct lttng_id_tracker_rcu *lttng_id_tracker_rcu_create(void) /* * Tracker add and del operations support concurrent RCU lookups. */ -int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id) +int lttng_id_tracker_add(struct lttng_kernel_id_tracker *lf, int id) { struct hlist_head *head; struct lttng_id_hash_node *e; - struct lttng_id_tracker_rcu *p = lf->p; + struct lttng_kernel_id_tracker_rcu *p = lf->p; uint32_t hash = hash_32(id, 32); bool allocated = false; int ret; @@ -137,11 +137,11 @@ void id_tracker_del_node(struct lttng_id_hash_node *e) kfree(e); } -int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id) +int lttng_id_tracker_del(struct lttng_kernel_id_tracker *lf, int id) { struct hlist_head *head; struct lttng_id_hash_node *e; - struct lttng_id_tracker_rcu *p = lf->p; + struct lttng_kernel_id_tracker_rcu *p = lf->p; uint32_t hash = hash_32(id, 32); if (!p) @@ -160,7 +160,7 @@ int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id) return -ENOENT; /* Not found */ } -static void lttng_id_tracker_rcu_destroy(struct lttng_id_tracker_rcu *p) +static void lttng_id_tracker_rcu_destroy(struct lttng_kernel_id_tracker_rcu *p) { int i; @@ -177,9 +177,9 @@ static void lttng_id_tracker_rcu_destroy(struct lttng_id_tracker_rcu *p) kfree(p); } -int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf) +int lttng_id_tracker_empty_set(struct lttng_kernel_id_tracker *lf) { - struct lttng_id_tracker_rcu *p, *oldp; + struct lttng_kernel_id_tracker_rcu *p, *oldp; p = lttng_id_tracker_rcu_create(); if (!p) @@ -191,14 +191,34 @@ int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf) return 0; } -void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu) +int lttng_id_tracker_init(struct lttng_kernel_id_tracker *lf, + struct lttng_kernel_session *session, + enum tracker_type type) { - struct lttng_id_tracker_rcu *p = lf->p; + lf->priv = kzalloc(sizeof(*lf->priv), GFP_KERNEL); + if (!lf->priv) + return -ENOMEM; + lf->priv->session = session; + lf->priv->tracker_type = type; + return 0; +} + +void lttng_id_tracker_destroy(struct lttng_kernel_id_tracker *lf, bool rcu) +{ + struct lttng_kernel_id_tracker_rcu *p = lf->p; - if (!lf->p) + if (!p) return; rcu_assign_pointer(lf->p, NULL); if (rcu) synchronize_trace(); lttng_id_tracker_rcu_destroy(p); } + +void lttng_id_tracker_fini(struct lttng_kernel_id_tracker *lf) +{ + if (!lf) + return; + lttng_id_tracker_destroy(lf, false); + kfree(lf->priv); +}