From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Zhaolei <zhaolei@cn.fujitsu.com>
Cc: kosaki.motohiro@jp.fujitsu.com,
Steven Rostedt <rostedt@goodmis.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH] Add timer-source of walltime for ftrace
Date: Wed, 19 Aug 2009 00:57:46 +0900 (JST) [thread overview]
Message-ID: <20090818215620.A63C.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <4A89213C.5090109@cn.fujitsu.com>
> +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?
next prev parent reply other threads:[~2009-08-18 15:58 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-24 10:40 [PATCH 0/3] Add walltime support for ring-buffer Zhaolei
2009-07-24 10:42 ` [PATCH] " Zhaolei
2009-07-24 10:47 ` Zhaolei
2009-07-24 10:43 ` [RFC PATCH 1/3] " Zhaolei
2009-07-24 10:43 ` [RFC PATCH 2/3] Apply walltime-supporting functions to trace system Zhaolei
2009-07-24 10:44 ` [RFC PATCH 3/3] Make ftrace display walltime in output Zhaolei
2009-07-24 13:05 ` [PATCH 0/3] Add walltime support for ring-buffer Steven Rostedt
2009-07-28 1:43 ` KOSAKI Motohiro
2009-07-28 1:53 ` Frederic Weisbecker
2009-07-28 2:19 ` Steven Rostedt
2009-08-17 9:22 ` [RFC PATCH] Add timer-source of walltime for ftrace Zhaolei
2009-08-17 16:49 ` Frederic Weisbecker
2009-08-18 2:09 ` Zhaolei
2009-08-18 18:52 ` Steven Rostedt
2009-08-18 15:57 ` KOSAKI Motohiro [this message]
2009-08-18 18:58 ` Steven Rostedt
2009-08-19 9:16 ` Zhaolei
2009-08-25 8:12 ` [PATCH 0/3] ftrace: " Zhaolei
2009-08-25 8:12 ` [PATCH 1/3] ftrace: Move setting of clock-source out of options Zhaolei
2009-08-26 2:35 ` Steven Rostedt
2009-08-26 7:23 ` [tip:tracing/core] " tip-bot for Zhaolei
2009-08-25 8:14 ` [PATCH 2/3] ftrace: add tracepoint for xtime Zhaolei
2009-08-26 2:39 ` Steven Rostedt
2009-09-01 8:03 ` Zhaolei
2009-09-16 19:56 ` john stultz
2009-09-16 19:58 ` john stultz
2009-09-16 20:32 ` Steven Rostedt
2009-09-16 20:49 ` john stultz
2009-09-17 6:34 ` Zhaolei
2009-08-25 8:15 ` [PATCH 3/3] ftrace: Add timer-source of walltime for ftrace Zhaolei
2009-08-26 2:52 ` Steven Rostedt
2009-09-16 5:25 ` [PATCH v2 0/2] " Zhaolei
2009-09-16 5:27 ` [PATCH v2 1/2] ftrace: add tracepoint for xtime Zhaolei
2009-09-16 19:33 ` Steven Rostedt
2009-09-16 5:29 ` [PATCH v2 2/2] ftrace: Add timer-source of walltime for ftrace Zhaolei
2009-09-16 5:59 ` Frederic Weisbecker
2009-09-16 6:40 ` Zhaolei
2009-09-16 19:37 ` Steven Rostedt
2009-09-17 7:10 ` Zhaolei
2009-11-04 9:39 ` [PATCH v3] ftrace: Add timer-source of walltime Zhaolei
2009-11-04 9:39 ` Zhaolei
2009-11-04 9:41 ` Zhaolei
2009-07-28 2:23 ` [PATCH 0/3] Add walltime support for ring-buffer KOSAKI Motohiro
2009-08-03 7:22 ` Ingo Molnar
2009-08-03 9:32 ` KOSAKI Motohiro
2009-08-04 14:38 ` Ingo Molnar
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