linux-kernel - Re: [RFC][PATCH 1/3] tracing: Added hardware latency tracer

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Date:	Fri, 5 Aug 2016 16:25:21 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Clark Williams <williams@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jon Masters <jcm@...hat.com>, Daniel Wagner <wagi@...om.org>,
	Carsten Emde <C.Emde@...dl.org>
Subject: Re: [RFC][PATCH 1/3] tracing: Added hardware latency tracer

* Steven Rostedt | 2016-08-04 10:57:09 [-0400]:

>diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
>new file mode 100644
>index 000000000000..08dfabe4e862
>--- /dev/null
>+++ b/kernel/trace/trace_hwlat.c
…
>+/* Macros to encapsulate the time capturing infrastructure */
>+#define time_type	u64
>+#define time_get()	trace_clock_local()
>+#define time_to_us(x)	div_u64(x, 1000)
>+#define time_sub(a, b)	((a) - (b))
>+#define init_time(a, b)	(a = b)
>+#define time_u64(a)	a

Do we need a macro for this? In the old code we could choose between
CONFIG_TRACING but now we don't.

Sebastian