Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
authored by
Masami Hiramatsu
and committed by
Steven Rostedt (VMware)
4f99f848
6c610dba
+25
-2
+25
-2
kernel/trace/trace_boot.c
+25
-2
kernel/trace/trace_boot.c
···
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trace_boot_init_events(struct trace_array *tr, struct xbc_node *node)
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{
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struct xbc_node *gnode, *enode;
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+
bool enable, enable_all = false;
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const char *data;
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node = xbc_node_find_child(node, "event");
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if (!node)
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return;
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/* per-event key starts with "event.GROUP.EVENT" */
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-
xbc_node_for_each_child(node, gnode)
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-
xbc_node_for_each_child(gnode, enode)
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xbc_node_for_each_child(node, gnode) {
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data = xbc_node_get_data(gnode);
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if (!strcmp(data, "enable")) {
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enable_all = true;
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continue;
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}
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enable = false;
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xbc_node_for_each_child(gnode, enode) {
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data = xbc_node_get_data(enode);
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if (!strcmp(data, "enable")) {
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enable = true;
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continue;
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}
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trace_boot_init_one_event(tr, gnode, enode);
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}
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/* Event enablement must be done after event settings */
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if (enable) {
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data = xbc_node_get_data(gnode);
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trace_array_set_clr_event(tr, data, NULL, true);
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}
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}
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/* Ditto */
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if (enable_all)
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trace_array_set_clr_event(tr, NULL, NULL, true);
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}
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#else
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#define trace_boot_enable_events(tr, node) do {} while (0)