Size-based rotation

[lttng-tools.git] / src / bin / lttng-sessiond / session.h

diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h
index 368b352fa22388c9edae452fda760535b767ccf5..ab9b1a9a4355edf8aa98ecb29d7350802d96fb26 100644 (file)
--- a/src/bin/lttng-sessiond/session.h
+++ b/src/bin/lttng-sessiond/session.h
@@ -19,9 +19,11 @@
 #define _LTT_SESSION_H
 
 #include <limits.h>
+#include <stdbool.h>
 #include <urcu/list.h>
 
 #include <common/hashtable/hashtable.h>
+#include <lttng/rotation.h>
 
 #include "snapshot.h"
 #include "trace-kernel.h"
@@ -109,6 +111,86 @@ struct ltt_session {
         * Timer set when the session is created for live reading.
         */
        unsigned int live_timer;
+       /*
+        * Path where to keep the shared memory files.
+        */
+       char shm_path[PATH_MAX];
+       /*
+        * Node in ltt_sessions_ht_by_id.
+        */
+       struct lttng_ht_node_u64 node;
+       /* Number of session rotation for this session. */
+       uint64_t rotate_count;
+       /*
+        * Rotation is pending between the time it starts until the consumer has
+        * finished extracting the data. If the session uses a relay, data related
+        * to a rotation can still be in flight after that, see
+        * rotate_pending_relay.
+        */
+       bool rotate_pending;
+       /*
+        * True until the relay has finished the rotation of all the streams.
+        */
+       bool rotate_pending_relay;
+       /* Current state of a rotation. */
+       enum lttng_rotation_state rotation_state;
+       /*
+        * Number of channels waiting for a rotation.
+        * When this number reaches 0, we can handle the rename of the chunk
+        * folder and inform the client that the rotate is finished.
+        */
+       unsigned int nr_chan_rotate_pending;
+       struct {
+               /*
+                * When the rotation is in progress, the temporary path name is
+                * stored here. When the rotation is complete, the final path name
+                * is here and can be queried with the rotate_pending call.
+                */
+               char current_rotate_path[LTTNG_PATH_MAX];
+               /*
+                * The path where the consumer is currently writing after the first
+                * session rotation.
+                */
+               char active_tracing_path[LTTNG_PATH_MAX];
+       } rotation_chunk;
+       /*
+        * The timestamp of the beginning of the previous chunk. For the
+        * first chunk, this is the "lttng start" timestamp. For the
+        * subsequent ones, this copies the current_chunk_start_ts value when
+        * a new rotation starts. This value is used to set the name of a
+        * complete chunk directory, ex: "last_chunk_start_ts-now()".
+        */
+       time_t last_chunk_start_ts;
+       /*
+        * This is the timestamp when a new chunk starts. When a new rotation
+        * starts, we copy this value to last_chunk_start_ts and replace it
+        * with the current timestamp.
+        */
+       time_t current_chunk_start_ts;
+       /*
+        * Timer to check periodically if a relay has completed the last
+        * rotation.
+        */
+       bool rotate_relay_pending_timer_enabled;
+       timer_t rotate_relay_pending_timer;
+       /* Timer to periodically rotate a session. */
+       bool rotate_timer_enabled;
+       timer_t rotate_timer;
+       uint64_t rotate_timer_period;
+       /* Value for size-based rotation, 0 if disabled. */
+       uint64_t rotate_size;
+       /*
+        * Keep a state if this session was rotated after the last stop command.
+        * We only allow one rotation after a stop. At destroy, we also need to
+        * know if a rotation occured since the last stop to rename the current
+        * chunk.
+        */
+       bool rotated_after_last_stop;
+       /*
+        * Condition and trigger for size-based rotations.
+        */
+       struct lttng_condition *rotate_condition;
+       struct lttng_trigger *rotate_trigger;
 };
 
 /* Prototypes */
@@ -121,6 +203,7 @@ void session_unlock(struct ltt_session *session);
 void session_unlock_list(void);
 
 struct ltt_session *session_find_by_name(const char *name);
+struct ltt_session *session_find_by_id(uint64_t id);
 struct ltt_session_list *session_get_list(void);
 
 int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid);