From 913ea4d0b1074bac4c42a43ac1677dc56bbbcc52 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 30 Mar 2018 16:01:32 +0100 Subject: [PATCH] tracing: Mention trace_clock=global when warning about unstable clocks Mention the alternative of adding trace_clock=global to the kernel command line when we detect that we've used an unstable clock across a suspend/resume cycle. Link: http://lkml.kernel.org/r/20180330150132.16903-2-chris@chris-wilson.co.uk Signed-off-by: Chris Wilson Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/ring_buffer.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index a2fd3893cc02..515be03e3009 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2731,7 +2731,8 @@ rb_handle_timestamp(struct ring_buffer_per_cpu *cpu_buffer, sched_clock_stable() ? "" : "If you just came from a suspend/resume,\n" "please switch to the trace global clock:\n" - " echo global > /sys/kernel/debug/tracing/trace_clock\n"); + " echo global > /sys/kernel/debug/tracing/trace_clock\n" + "or add trace_clock=global to the kernel command line\n"); info->add_timestamp = 1; }