tracing: Change default buffer_percent to 50

After running several tests, it appears that having the reader wait till
half the buffer is full before starting to read (and causing its own events
to fill up the ring buffer constantly), works well. It keeps trace-cmd (the
main user of this interface) from dominating the traces it records.

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

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d382fd1aa4a67587932dd59e9c582034adf93684..194c01838e3fc74b68ec8799e949f86f9335b160 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8017,7 +8017,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
        trace_create_file("timestamp_mode", 0444, d_tracer, tr,
                          &trace_time_stamp_mode_fops);
 
-       tr->buffer_percent = 1;
+       tr->buffer_percent = 50;
 
        trace_create_file("buffer_percent", 0444, d_tracer,
                        tr, &buffer_percent_fops);