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Message-Id: <20090818215620.A63C.A69D9226@jp.fujitsu.com>
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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