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tracing: Add trace options for core options to instances

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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>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-09-30 12:30:06 -04:00 committed by Steven Rostedt
parent 2d34f48955
commit 16270145ce
1 changed files with 14 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

17
kernel/trace/trace.c
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@ -258,6 +258,11 @@ unsigned long long ns2usecs(cycle_t nsec)
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
@ -6387,18 +6392,22 @@ create_trace_option_core_file(struct trace_array *tr,
&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++)
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
rb_simple_read(struct file *filp, char __user *ubuf,
@ -6707,6 +6716,8 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
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 @@ static __init int tracer_init_tracefs(void)
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);