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tracing/boot: Add instance node support

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Add instance node support to boot-time tracing. User can set
some options and event nodes under instance node.

 - ftrace.instance.INSTANCE[...]
   Add new INSTANCE instance. Some options and event nodes
   are acceptable for instance node.

Link: http://lkml.kernel.org/r/157867242413.17873.9814204526141500278.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-01-11 01:07:04 +09:00 committed by Steven Rostedt (VMware)
parent 3fbe2d6e1f
commit 4f712a4d04
1 changed files with 38 additions and 5 deletions
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43
kernel/trace/trace_boot.c
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@ -20,7 +20,7 @@ extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
unsigned long size, int cpu_id);
static void __init
trace_boot_set_ftrace_options(struct trace_array *tr, struct xbc_node *node)
trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
{
struct xbc_node *anode;
const char *p;
@ -242,6 +242,40 @@ trace_boot_enable_tracer(struct trace_array *tr, struct xbc_node *node)
}
}
static void __init
trace_boot_init_one_instance(struct trace_array *tr, struct xbc_node *node)
{
trace_boot_set_instance_options(tr, node);
trace_boot_init_events(tr, node);
trace_boot_enable_events(tr, node);
trace_boot_enable_tracer(tr, node);
}
static void __init
trace_boot_init_instances(struct xbc_node *node)
{
struct xbc_node *inode;
struct trace_array *tr;
const char *p;
node = xbc_node_find_child(node, "instance");
if (!node)
return;
xbc_node_for_each_child(node, inode) {
p = xbc_node_get_data(inode);
if (!p || *p == '\0')
continue;
tr = trace_array_get_by_name(p);
if (IS_ERR(tr)) {
pr_err("Failed to get trace instance %s\n", p);
continue;
}
trace_boot_init_one_instance(tr, inode);
}
}
static int __init trace_boot_init(void)
{
struct xbc_node *trace_node;
@ -255,10 +289,9 @@ static int __init trace_boot_init(void)
if (!tr)
return 0;
trace_boot_set_ftrace_options(tr, trace_node);
trace_boot_init_events(tr, trace_node);
trace_boot_enable_events(tr, trace_node);
trace_boot_enable_tracer(tr, trace_node);
/* Global trace array is also one instance */
trace_boot_init_one_instance(tr, trace_node);
trace_boot_init_instances(trace_node);
return 0;
}