Add loglevel enable/disable support

[lttng-ust.git] / liblttng-ust / ltt-events.c

diff --git a/liblttng-ust/ltt-events.c b/liblttng-ust/ltt-events.c
index 06d2f89714feeeaa3771361efd15bff5a003f2ad..c754d6ff5348e3346fc2765bbaad478a6d834bfc 100644 (file)
--- a/liblttng-ust/ltt-events.c
+++ b/liblttng-ust/ltt-events.c
@@ -31,6 +31,7 @@
 
 #include <usterr-signal-safe.h>
 #include <helper.h>
+#include "error.h"
 
 #include "ltt-tracer.h"
 #include "ltt-tracer-core.h"
@@ -73,6 +74,7 @@ struct ust_pending_probe {
 };
 
 static void _ltt_event_destroy(struct ltt_event *event);
+static void _ltt_loglevel_destroy(struct loglevel_entry *entry);
 static void _ltt_channel_destroy(struct ltt_channel *chan);
 static int _ltt_event_unregister(struct ltt_event *event);
 static
@@ -134,6 +136,11 @@ int pending_probe_fix_events(const struct lttng_event_desc *desc)
        uint32_t hash = jhash(name, name_len - 1, 0);
        int ret = 0;
 
+       /* TODO:
+        * For this event, we need to lookup the loglevel. If active (in
+        * the active loglevels hash table), we must create the event.
+        */
+
        head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)];
        cds_hlist_for_each_entry_safe(e, node, p, head, node) {
                struct ltt_event *event;
@@ -173,6 +180,7 @@ struct ltt_session *ltt_session_create(void)
                return NULL;
        CDS_INIT_LIST_HEAD(&session->chan);
        CDS_INIT_LIST_HEAD(&session->events);
+       CDS_INIT_LIST_HEAD(&session->loglevels);
        uuid_generate(session->uuid);
        cds_list_add(&session->list, &sessions);
        return session;
@@ -182,6 +190,7 @@ void ltt_session_destroy(struct ltt_session *session)
 {
        struct ltt_channel *chan, *tmpchan;
        struct ltt_event *event, *tmpevent;
+       struct loglevel_entry *loglevel, *tmploglevel;
        int ret;
 
        CMM_ACCESS_ONCE(session->active) = 0;
@@ -190,6 +199,8 @@ void ltt_session_destroy(struct ltt_session *session)
                WARN_ON(ret);
        }
        synchronize_trace();    /* Wait for in-flight events to complete */
+       cds_list_for_each_entry_safe(loglevel, tmploglevel, &session->loglevels, list)
+               _ltt_loglevel_destroy(loglevel);
        cds_list_for_each_entry_safe(event, tmpevent, &session->events, list)
                _ltt_event_destroy(event);
        cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list)
@@ -347,6 +358,26 @@ void _ltt_channel_destroy(struct ltt_channel *chan)
        chan->ops->channel_destroy(chan);
 }
 
+int ltt_loglevel_create(struct ltt_channel *chan,
+       struct lttng_ust_event *event_param,
+       struct loglevel_entry **_entry)
+{
+       struct loglevel_entry *entry;
+
+       entry = add_loglevel(event_param->name, chan, event_param);
+       if (!entry || IS_ERR(entry)) {
+               return PTR_ERR(entry);
+       }
+       *_entry = entry;
+       return 0;
+}
+
+static
+void _ltt_loglevel_destroy(struct loglevel_entry *entry)
+{
+       _remove_loglevel(entry);
+}
+
 /*
  * Supports event creation while tracing session is active.
  */
@@ -410,11 +441,7 @@ int ltt_event_create(struct ltt_channel *chan,
                }
                break;
        case LTTNG_UST_TRACEPOINT_LOGLEVEL:
-               /*
-                * TODO: add tracepoint loglevel to hash table, with
-                * event info. Enable all events corresponding to
-                * loglevel.
-                */
+               assert(0);
                break;
        default:
                WARN_ON_ONCE(1);