tree 29404444fa5106e6d3361fc6c85b4463777ec3a3
parent 51ea8a88aae425915b458bfe295f1f10a3d52781
author Steven Rostedt <srostedt@redhat.com> 1286560308 -0400
committer Steven Rostedt <rostedt@goodmis.org> 1287508956 -0400

ring-buffer: Make write slow path out of line

Gcc inlines the slow path of the ring buffer write which can
hurt performance. This patch simply forces the slow path function
rb_move_tail() to always be a function.

The ring_buffer_benchmark module with reader_disabled=1 shows that
this patch changes the time to record an event from 135 ns to
132 ns. (3 ns or 2.22% improvement)

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>