linux-kernel - Re: [RFC PATCH] Add timer-source of walltime for ftrace

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Date:	Wed, 19 Aug 2009 00:57:46 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] Add timer-source of walltime for ftrace

> +u64 notrace trace_clock_walltime(void)
> +{
> +	u32 remainder;
> +	return base_walltime.tv_sec + div_u64_rem(
> +			trace_clock() + base_walltime.tv_nsec,
> +			NSEC_PER_SEC, &remainder);
> +}

Why do we need calculate walltime at ring-buffer recordng phase?
IOW, Why can't we calculate this at displaing time?




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