tracing: Add trace options for core options to instances
Allow instances to have their own options, at least for the core options
(non tracer specific ones). There are a few global options that should not
be added to instances, like enabling of trace_printk, and the sched comm
recording, which do not have a specific trace instance associated to them.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 51697b4..7b99e36 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -258,6 +258,11 @@
TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | \
TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS)
+/* trace_options that are only supported by global_trace */
+#define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK | \
+ TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD)
+
+
/*
* The global_trace is the descriptor that holds the tracing
* buffers for the live tracing. For each CPU, it contains
@@ -6387,17 +6392,21 @@
&trace_options_core_fops);
}
-static __init void create_trace_options_dir(struct trace_array *tr)
+static void create_trace_options_dir(struct trace_array *tr)
{
struct dentry *t_options;
+ bool top_level = tr == &global_trace;
int i;
t_options = trace_options_init_dentry(tr);
if (!t_options)
return;
- for (i = 0; trace_options[i]; i++)
- create_trace_option_core_file(tr, trace_options[i], i);
+ for (i = 0; trace_options[i]; i++) {
+ if (top_level ||
+ !((1 << i) & TOP_LEVEL_TRACE_FLAGS))
+ create_trace_option_core_file(tr, trace_options[i], i);
+ }
}
static ssize_t
@@ -6707,6 +6716,8 @@
trace_create_file("tracing_on", 0644, d_tracer,
tr, &rb_simple_fops);
+ create_trace_options_dir(tr);
+
#ifdef CONFIG_TRACER_MAX_TRACE
trace_create_file("tracing_max_latency", 0644, d_tracer,
&tr->max_latency, &tracing_max_lat_fops);
@@ -6903,8 +6914,6 @@
create_trace_instances(d_tracer);
- create_trace_options_dir(&global_trace);
-
mutex_lock(&trace_types_lock);
for (t = trace_types; t; t = t->next)
add_tracer_options(&global_trace, t);
