tracing: Add disable_on_free option (cf30cf67) · Commits · 戴 / test

Add a trace option to disable tracing on free. When this option is set, a write into the free_buffer file will not only shrink the ring buffer down to zero, but it will also disable tracing. Cc: Vaibhav Nagarnaik <vnagarnaik@google.com> Signed-off-by:

Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -425,6 +425,7 @@ static const char *trace_options[] = {
		"graph-time",
		"record-cmd",
		"overwrite",
		"disable_on_free",
		NULL
		};

		@@ -3518,7 +3519,8 @@ tracing_free_buffer_write(struct file filp, const char __user ubuf,
		static int
		tracing_free_buffer_release(struct inode inode, struct file filp)
		{
		/* disable tracing */
		/* disable tracing ? */
		if (trace_flags & TRACE_ITER_STOP_ON_FREE)
		tracing_off();
		/* resize the ring buffer to 0 */
		tracing_resize_ring_buffer(0);

kernel/trace/trace.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -609,6 +609,7 @@ enum trace_iterator_flags {
		TRACE_ITER_GRAPH_TIME = 0x80000,
		TRACE_ITER_RECORD_CMD = 0x100000,
		TRACE_ITER_OVERWRITE = 0x200000,
		TRACE_ITER_STOP_ON_FREE = 0x400000,
		};

		/*

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