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ftrace: Allow for function tracing instance to filter functions

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Create a "set_ftrace_filter" and "set_ftrace_notrace" files in the instance
directories to let users filter of functions to trace for the given instance.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2014-01-10 16:17:45 -05:00
committed by Steven Rostedt
parent e3b3e2e847
commit 591dffdade
5 changed files with 96 additions and 14 deletions
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40
kernel/trace/trace_functions.c
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@@ -52,10 +52,34 @@ static int allocate_ftrace_ops(struct trace_array *tr)
return 0;
}
int ftrace_create_function_files(struct trace_array *tr,
struct dentry *parent)
{
int ret;
/* The top level array uses the "global_ops". */
if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL)) {
ret = allocate_ftrace_ops(tr);
if (ret)
return ret;
}
ftrace_create_filter_files(tr->ops, parent);
return 0;
}
void ftrace_destroy_function_files(struct trace_array *tr)
{
ftrace_destroy_filter_files(tr->ops);
kfree(tr->ops);
tr->ops = NULL;
}
static int function_trace_init(struct trace_array *tr)
{
struct ftrace_ops *ops;
int ret;
if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
/* There's only one global tr */
@@ -69,10 +93,13 @@ static int function_trace_init(struct trace_array *tr)
else
ops = &trace_ops;
tr->ops = ops;
} else {
ret = allocate_ftrace_ops(tr);
if (ret)
return ret;
} else if (!tr->ops) {
/*
* Instance trace_arrays get their ops allocated
* at instance creation. Unless it failed
* the allocation.
*/
return -ENOMEM;
}
tr->trace_buffer.cpu = get_cpu();
@@ -87,9 +114,6 @@ static void function_trace_reset(struct trace_array *tr)
{
tracing_stop_function_trace(tr);
tracing_stop_cmdline_record();
if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL))
kfree(tr->ops);
tr->ops = NULL;
}
static void function_trace_start(struct trace_array *tr)