#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
-#include <linux/uuid.h>
+#include "wrapper/uuid.h"
#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
#include "ltt-events.h"
#include "ltt-tracer.h"
static
int _ltt_session_metadata_statedump(struct ltt_session *session);
-
-static
void synchronize_trace(void)
{
synchronize_sched();
kfree(session);
}
-int ltt_session_start(struct ltt_session *session)
+int ltt_session_enable(struct ltt_session *session)
{
int ret = 0;
struct ltt_channel *chan;
ACCESS_ONCE(session->active) = 1;
ACCESS_ONCE(session->been_active) = 1;
- synchronize_trace(); /* Wait for in-flight events to complete */
ret = _ltt_session_metadata_statedump(session);
- if (ret) {
+ if (ret)
ACCESS_ONCE(session->active) = 0;
- synchronize_trace(); /* Wait for in-flight events to complete */
- }
end:
mutex_unlock(&sessions_mutex);
return ret;
}
-int ltt_session_stop(struct ltt_session *session)
+int ltt_session_disable(struct ltt_session *session)
{
int ret = 0;
goto end;
}
ACCESS_ONCE(session->active) = 0;
- synchronize_trace(); /* Wait for in-flight events to complete */
end:
mutex_unlock(&sessions_mutex);
return ret;
}
+int ltt_channel_enable(struct ltt_channel *channel)
+{
+ int old;
+
+ if (channel == channel->session->metadata)
+ return -EPERM;
+ old = xchg(&channel->enabled, 1);
+ if (old)
+ return -EEXIST;
+ return 0;
+}
+
+int ltt_channel_disable(struct ltt_channel *channel)
+{
+ int old;
+
+ if (channel == channel->session->metadata)
+ return -EPERM;
+ old = xchg(&channel->enabled, 0);
+ if (!old)
+ return -EEXIST;
+ return 0;
+}
+
+int ltt_event_enable(struct ltt_event *event)
+{
+ int old;
+
+ if (event->chan == event->chan->session->metadata)
+ return -EPERM;
+ old = xchg(&event->enabled, 1);
+ if (old)
+ return -EEXIST;
+ return 0;
+}
+
+int ltt_event_disable(struct ltt_event *event)
+{
+ int old;
+
+ if (event->chan == event->chan->session->metadata)
+ return -EPERM;
+ old = xchg(&event->enabled, 0);
+ if (!old)
+ return -EEXIST;
+ return 0;
+}
+
static struct ltt_transport *ltt_transport_find(const char *name)
{
struct ltt_transport *transport;
read_timer_interval);
if (!chan->chan)
goto create_error;
+ chan->enabled = 1;
chan->ops = &transport->ops;
list_add(&chan->list, &session->chan);
mutex_unlock(&sessions_mutex);
event->chan = chan;
event->filter = filter;
event->id = chan->free_event_id++;
+ event->enabled = 1;
event->instrumentation = event_param->instrumentation;
/* Populate ltt_event structure before tracepoint registration. */
smp_wmb();