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Subject[PATCH 1/2] tracing/boot: Add per-group/all events enablement
Date
Add ftrace.event.<GROUP>.enable and ftrace.event.enable
boot-time tracing, which enables all events under
given GROUP and all events respectivly.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
kernel/trace/trace_boot.c | 27 +++++++++++++++++++++++++--
1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index a82f03f385f8..94ef2d099e32 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -225,14 +225,37 @@ static void __init
trace_boot_init_events(struct trace_array *tr, struct xbc_node *node)
{
struct xbc_node *gnode, *enode;
+ bool enable, enable_all = false;
+ const char *data;

node = xbc_node_find_child(node, "event");
if (!node)
return;
/* per-event key starts with "event.GROUP.EVENT" */
- xbc_node_for_each_child(node, gnode)
- xbc_node_for_each_child(gnode, enode)
+ xbc_node_for_each_child(node, gnode) {
+ data = xbc_node_get_data(gnode);
+ if (!strcmp(data, "enable")) {
+ enable_all = true;
+ continue;
+ }
+ enable = false;
+ xbc_node_for_each_child(gnode, enode) {
+ data = xbc_node_get_data(enode);
+ if (!strcmp(data, "enable")) {
+ enable = true;
+ continue;
+ }
trace_boot_init_one_event(tr, gnode, enode);
+ }
+ /* Event enablement must be done after event settings */
+ if (enable) {
+ data = xbc_node_get_data(gnode);
+ trace_array_set_clr_event(tr, data, NULL, true);
+ }
+ }
+ /* Ditto */
+ if (enable_all)
+ trace_array_set_clr_event(tr, NULL, NULL, true);
}
#else
#define trace_boot_enable_events(tr, node) do {} while (0)
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