X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=libtracing%2Frelay.h;h=4b27b5bc8a7a476e5ded96c5ff7c84cbbe4287b0;hb=0b0cd93782698872ea4778d29cd68091663ca367;hp=1689418342fa5fde75d3a40f409dcd0fbb6c0cfe;hpb=3847c3bab100bfb6b01b5654c2429a5d0d162ff5;p=ust.git

diff --git a/libtracing/relay.h b/libtracing/relay.h
index 1689418..4b27b5b 100644
--- a/libtracing/relay.h
+++ b/libtracing/relay.h
@@ -59,7 +59,7 @@ struct rchan_buf {
 //ust//	unsigned int page_count;        /* number of current buffer pages */ 
 	unsigned int finalized;         /* buffer has been finalized */ 
 //ust//	unsigned int cpu;               /* this buf's cpu */ 
-	int shmid;
+	int shmid;			/* the shmid of the buffer data pages */
 } ____cacheline_aligned; 
 
 /*
@@ -320,7 +320,7 @@ extern const struct file_operations ltt_relay_file_operations;
 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 */
+//ust//	local_t *commit_count;		/* Commit count per sub-buffer */
 	atomic_long_t consumed;		/*
 					 * Current offset in the buffer
 					 * standard atomic access (shared)
@@ -335,16 +335,27 @@ struct ltt_channel_buf_struct {
 					 */
 	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//	spinlock_t full_lock;		/*
+//ust//					 * buffer full condition spinlock, only
+//ust//					 * for userspace tracing blocking mode
+//ust//					 * synchronization with reader.
+//ust//					 */
 //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 ? */
+//ust//	atomic_t wakeup_readers;	/* Boolean : wakeup readers waiting ? */
+	/* one byte is written to this pipe when data is available, in order
+           to wake the consumer */
+	/* portability: Single byte writes must be as quick as possible. The kernel-side
+	   buffer must be large enough so the writer doesn't block. From the pipe(7)
+           man page: Since linux 2.6.11, the pipe capacity is 65536 bytes. */
+	int data_ready_fd_write;
+	/* the reading end of the pipe */
+	int data_ready_fd_read;
+
+	/* commit count per subbuffer; must be at end of struct */
+	local_t commit_count[0] ____cacheline_aligned;
 } ____cacheline_aligned;
 
 int ltt_do_get_subbuf(struct rchan_buf *buf, struct ltt_channel_buf_struct *ltt_buf, long *pconsumed_old);