From: Mathieu Desnoyers Date: Wed, 3 Nov 2021 20:21:43 +0000 (-0400) Subject: Refactoring: merge lttng_sync_event_list common code X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=a0c6ad2e91bfd5feaa5d6e2ef2a9dff83b0db43c;p=lttng-modules.git Refactoring: merge lttng_sync_event_list common code Signed-off-by: Mathieu Desnoyers Change-Id: I49493dbe1ff0868b5ed576828d0efe7cf526a6c5 --- diff --git a/src/lttng-events.c b/src/lttng-events.c index 6d3e3f1a..79528632 100644 --- a/src/lttng-events.c +++ b/src/lttng-events.c @@ -2645,69 +2645,116 @@ void lttng_event_sync_capture_state(struct lttng_kernel_event_common *event) } } +static +bool lttng_get_event_enabled_state(struct lttng_kernel_event_common *event) +{ + struct lttng_enabler_ref *enabler_ref; + bool enabled = false; + + switch (event->priv->instrumentation) { + case LTTNG_KERNEL_ABI_TRACEPOINT: + lttng_fallthrough; + case LTTNG_KERNEL_ABI_SYSCALL: + /* Enable events */ + list_for_each_entry(enabler_ref, &event->priv->enablers_ref_head, node) { + if (enabler_ref->ref->enabled) { + enabled = true; + break; + } + } + break; + default: + WARN_ON_ONCE(1); + return false; + } + + switch (event->type) { + case LTTNG_KERNEL_EVENT_TYPE_RECORDER: + { + struct lttng_kernel_event_recorder *event_recorder = + container_of(event, struct lttng_kernel_event_recorder, parent); + + /* + * Enabled state is based on union of enablers, with + * intersection of session and channel transient enable + * states. + */ + return enabled && event_recorder->chan->parent.session->priv->tstate && event_recorder->chan->priv->parent.tstate; + } + case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: + return enabled; + default: + WARN_ON_ONCE(1); + return false; + } +} + +static +bool lttng_event_is_lazy_sync(struct lttng_kernel_event_common *event) +{ + switch (event->priv->instrumentation) { + case LTTNG_KERNEL_ABI_TRACEPOINT: + lttng_fallthrough; + case LTTNG_KERNEL_ABI_SYSCALL: + return true; + + default: + /* Not handled with lazy sync. */ + return false; + } +} + /* - * lttng_session_sync_event_enablers should be called just before starting a - * session. * Should be called with sessions mutex held. */ static -void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) +void lttng_sync_event_list(struct list_head *event_enabler_list, + struct list_head *event_list) { + struct lttng_kernel_event_common_private *event_priv; struct lttng_event_enabler_common *event_enabler; - struct lttng_kernel_event_recorder_private *event_recorder_priv; - list_for_each_entry(event_enabler, &session->priv->enablers_head, node) + list_for_each_entry(event_enabler, event_enabler_list, node) lttng_event_enabler_ref_events(event_enabler); + /* * For each event, if at least one of its enablers is enabled, * and its channel and session transient states are enabled, we * enable the event, else we disable it. */ - list_for_each_entry(event_recorder_priv, &session->priv->events, parent.node) { - struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; - struct lttng_enabler_ref *enabler_ref; - int enabled = 0; - - switch (event_recorder_priv->parent.instrumentation) { - case LTTNG_KERNEL_ABI_TRACEPOINT: - lttng_fallthrough; - case LTTNG_KERNEL_ABI_SYSCALL: - /* Enable events */ - list_for_each_entry(enabler_ref, - &event_recorder_priv->parent.enablers_ref_head, node) { - if (enabler_ref->ref->enabled) { - enabled = 1; - break; - } - } - break; + list_for_each_entry(event_priv, event_list, node) { + struct lttng_kernel_event_common *event = event_priv->pub; + bool enabled; - default: - /* Not handled with lazy sync. */ + if (!lttng_event_is_lazy_sync(event)) continue; - } - /* - * Enabled state is based on union of enablers, with - * intesection of session and channel transient enable - * states. - */ - enabled = enabled && session->priv->tstate && event_recorder->chan->priv->parent.tstate; - WRITE_ONCE(event_recorder->parent.enabled, enabled); + enabled = lttng_get_event_enabled_state(event); + WRITE_ONCE(event->enabled, enabled); /* - * Sync tracepoint registration with event enabled - * state. + * Sync tracepoint registration with event enabled state. */ if (enabled) { - register_event(&event_recorder->parent); + register_event(event); } else { - _lttng_event_unregister(&event_recorder->parent); + _lttng_event_unregister(event); } - lttng_event_sync_filter_state(&event_recorder_priv->pub->parent); + lttng_event_sync_filter_state(event); + lttng_event_sync_capture_state(event); } } +/* + * lttng_session_sync_event_enablers should be called just before starting a + * session. + */ +static +void lttng_session_sync_event_enablers(struct lttng_kernel_session *session) +{ + lttng_sync_event_list(&session->priv->enablers_head, &session->priv->events); +} + /* * Apply enablers to session events, adding events to session if need * be. It is required after each modification applied to an active @@ -2727,56 +2774,7 @@ void lttng_session_lazy_sync_event_enablers(struct lttng_kernel_session *session static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) { - struct lttng_event_enabler_common *event_enabler; - struct lttng_kernel_event_notifier_private *event_notifier_priv; - - list_for_each_entry(event_enabler, &event_notifier_group->enablers_head, node) - lttng_event_enabler_ref_events(event_enabler); - - /* - * For each event_notifier, if at least one of its enablers is enabled, - * we enable the event_notifier, else we disable it. - */ - list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, parent.node) { - struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; - struct lttng_enabler_ref *enabler_ref; - int enabled = 0; - - switch (event_notifier_priv->parent.instrumentation) { - case LTTNG_KERNEL_ABI_TRACEPOINT: - lttng_fallthrough; - case LTTNG_KERNEL_ABI_SYSCALL: - /* Enable event_notifiers */ - list_for_each_entry(enabler_ref, - &event_notifier_priv->parent.enablers_ref_head, node) { - if (enabler_ref->ref->enabled) { - enabled = 1; - break; - } - } - break; - - default: - /* Not handled with sync. */ - continue; - } - - WRITE_ONCE(event_notifier->parent.enabled, enabled); - /* - * Sync tracepoint registration with event_notifier enabled - * state. - */ - if (enabled) { - if (!event_notifier_priv->parent.registered) - register_event(&event_notifier->parent); - } else { - if (event_notifier_priv->parent.registered) - _lttng_event_unregister(&event_notifier->parent); - } - - lttng_event_sync_filter_state(&event_notifier_priv->pub->parent); - lttng_event_sync_capture_state(&event_notifier_priv->pub->parent); - } + lttng_sync_event_list(&event_notifier_group->enablers_head, &event_notifier_group->event_notifiers_head); } static