ust: generate traces readable in lttv

[ust.git] / libtracing / relay.h

diff --git a/libtracing/relay.h b/libtracing/relay.h
index 47ebfd13fd9e99cc870bd0fa7302dedc92d12f5d..54bd2b9e72b81a3da057939ada48fa0dd6ededc9 100644 (file)
--- a/libtracing/relay.h
+++ b/libtracing/relay.h
@@ -314,5 +314,42 @@ extern void ltt_relay_close(struct rchan *chan);
  */
 extern const struct file_operations ltt_relay_file_operations;
 
+
+/* LTTng lockless logging buffer info */
+struct ltt_channel_buf_struct {
+       /* First 32 bytes cache-hot cacheline */
+       local_t offset;                 /* Current offset in the buffer */
+       local_t *commit_count;          /* Commit count per sub-buffer */
+       atomic_long_t consumed;         /*
+                                        * Current offset in the buffer
+                                        * standard atomic access (shared)
+                                        */
+       unsigned long last_tsc;         /*
+                                        * Last timestamp written in the buffer.
+                                        */
+       /* End of first 32 bytes cacheline */
+       atomic_long_t active_readers;   /*
+                                        * Active readers count
+                                        * standard atomic access (shared)
+                                        */
+       local_t events_lost;
+       local_t corrupted_subbuffers;
+       spinlock_t full_lock;           /*
+                                        * buffer full condition spinlock, only
+                                        * for userspace tracing blocking mode
+                                        * synchronization with reader.
+                                        */
+//ust//        wait_queue_head_t write_wait;   /*
+//ust//                                         * Wait queue for blocking user space
+//ust//                                         * writers
+//ust//                                         */
+       atomic_t wakeup_readers;        /* Boolean : wakeup readers waiting ? */
+} ____cacheline_aligned;
+
+int ltt_do_get_subbuf(struct rchan_buf *buf, struct ltt_channel_buf_struct *ltt_buf, long *pconsumed_old);
+
+int ltt_do_put_subbuf(struct rchan_buf *buf, struct ltt_channel_buf_struct *ltt_buf, u32 uconsumed_old);
+
+
 #endif /* _LINUX_LTT_RELAY_H */