Cleanup: lib_ring_buffer_switch_new_end() only calls subbuffer_set_data_size()

lib_ring_buffer_switch_new_end() is always called when an event exactly
fills a sub-buffer, which makes padding_size always 0. However, there is
one side-effect that lib_ring_buffer_switch_new_end() needs to have: it
calls subbuffer_set_data_size() to update the size of the data to be
read from the sub-buffer.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/libringbuffer/ring_buffer_frontend.c b/libringbuffer/ring_buffer_frontend.c
index c177f337da01aa4f457fbea66add969a837d691f..8c8126025878ed72929bf6ecd8ebedf9b2806148 100644 (file)
--- a/libringbuffer/ring_buffer_frontend.c
+++ b/libringbuffer/ring_buffer_frontend.c
@@ -1418,8 +1418,10 @@ void lib_ring_buffer_switch_new_start(struct lttng_ust_lib_ring_buffer *buf,
 /*
  * lib_ring_buffer_switch_new_end: finish switching current subbuffer
  *
- * The only remaining threads could be the ones with pending commits. They will
- * have to do the deliver themselves.
+ * Calls subbuffer_set_data_size() to set the data size of the current
+ * sub-buffer. We do not need to perform check_deliver nor commit here,
+ * since this task will be done by the "commit" of the event for which
+ * we are currently doing the space reservation.
  */
 static
 void lib_ring_buffer_switch_new_end(struct lttng_ust_lib_ring_buffer *buf,
@@ -1429,26 +1431,12 @@ void lib_ring_buffer_switch_new_end(struct lttng_ust_lib_ring_buffer *buf,
                                    struct lttng_ust_shm_handle *handle)
 {
        const struct lttng_ust_lib_ring_buffer_config *config = &chan->backend.config;
-       unsigned long endidx = subbuf_index(offsets->end - 1, chan);
-       unsigned long commit_count, padding_size, data_size;
+       unsigned long endidx, data_size;
 
+       endidx = subbuf_index(offsets->end - 1, chan);
        data_size = subbuf_offset(offsets->end - 1, chan) + 1;
-       padding_size = chan->backend.subbuf_size - data_size;
        subbuffer_set_data_size(config, &buf->backend, endidx, data_size,
                                handle);
-
-       /*
-        * Order all writes to buffer before the commit count update that will
-        * determine that the subbuffer is full.
-        */
-       cmm_smp_wmb();
-       v_add(config, padding_size, &shmp_index(handle, buf->commit_hot, endidx)->cc);
-       commit_count = v_read(config, &shmp_index(handle, buf->commit_hot, endidx)->cc);
-       lib_ring_buffer_check_deliver(config, buf, chan, offsets->end - 1,
-                                 commit_count, endidx, handle);
-       lib_ring_buffer_write_commit_counter(config, buf, chan, endidx,
-                                            offsets->end, commit_count,
-                                            padding_size, handle);
 }
 
 /*