linux-kernel - Question: Takes about 2s in sched_clock

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Message-ID: <5271EAAC.7080304@gmail.com>
Date:	Thu, 31 Oct 2013 13:29:16 +0800
From:	Younger Liu <younger.liucn@...il.com>
To:	kernel <linux-kernel@...r.kernel.org>
Subject: Question: Takes about 2s in sched_clock_init() when kernel boots

Hi,
  When I analyse boot time on ArmV7, I found that it takes
about 2s in sched_clock_init(), the log is as follow:
[    0.000000] before:sched_clock_init.
[    0.000000] start:sched_clock_init.
[    2.100505] end  :sched_clock_init.
[    2.103983] before:calibrate_delay.

  In my config, CONFIG_HAVE_UNSTABLE_SCHED_CLOCK does not config.

  Are there any suggestions?

	Younger
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