Commit 8490db06 authored Sep 10, 2020 by Masami Hiramatsu Committed by Steven Rostedt (VMware) Sep 21, 2020

tracing/boot: Add per-instance tracing_on option support

Add per-instance tracing_on option, which will be useful with
traceon/traceoff event trigger actions. For example, if we
disable tracing_on by default and set traceon and traceoff on
a pair of events, we can trace functions between the pair of
events.

Link: https://lkml.kernel.org/r/159972811538.428528.2561315102284268611.stgit@devnote2



Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

parent 40d14da3

kernel/trace/trace_boot.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -40,6 +40,16 @@ trace_boot_set_instance_options(struct trace_array tr, struct xbc_node node)
		pr_err("Failed to set option: %s\n", buf);
		}

		p = xbc_node_find_value(node, "tracing_on", NULL);
		if (p && *p != '\0') {
		if (kstrtoul(p, 10, &v))
		pr_err("Failed to set tracing on: %s\n", p);
		if (v)
		tracer_tracing_on(tr);
		else
		tracer_tracing_off(tr);
		}

		p = xbc_node_find_value(node, "trace_clock", NULL);
		if (p && *p != '\0') {
		if (tracing_set_clock(tr, p) < 0)

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