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tracing/boot: Add per-group/all events enablement 

Add ftrace.event.<GROUP>.enable and ftrace.event.enable
boot-time tracing, which enables all events under
given GROUP and all events respectivly.

Link: https://lkml.kernel.org/r/162264438005.302580.12019174481201855444.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 2021-06-02 23:33:00 +09:00 committed by Steven Rostedt (VMware)
parent 6c610dba6e
commit 4f99f84899
1 changed files with 25 additions and 2 deletions
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27
kernel/trace/trace_boot.c
View File

@ -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)