Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752532Ab3JaF3Z (ORCPT ); Thu, 31 Oct 2013 01:29:25 -0400 Received: from mail-pb0-f47.google.com ([209.85.160.47]:49644 "EHLO mail-pb0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750783Ab3JaF3Y (ORCPT ); Thu, 31 Oct 2013 01:29:24 -0400 Message-ID: <5271EAAC.7080304@gmail.com> Date: Thu, 31 Oct 2013 13:29:16 +0800 From: Younger Liu User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 MIME-Version: 1.0 To: kernel Subject: Question: Takes about 2s in sched_clock_init() when kernel boots Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 626 Lines: 18 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/