linux-kernel - Is it possible to use ftrace to measure secondary CPU bootup time

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Message-ID: <874lu2fkv4.fsf@yhuang-dev.intel.com>
Date:   Mon, 24 Jul 2017 13:46:07 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     "Steven Rostedt \(Red Hat\)" <rostedt@...dmis.org>
Cc:     Mengyang Liu <mengyang.liu@...el.com>,
        "Brandt\, Todd E" <todd.e.brandt@...el.com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Is it possible to use ftrace to measure secondary CPU bootup time

Hi, Steven,

We are working on parallelizing secondary CPU bootup.   So we need to
measure the bootup time of secondary CPU, that is, measure time spent in
smp_init() and its callees.  But we found that ftrace now doesn't
support measure time spent in smp_init() because it is called too early
(before core_initcall()?).  So, do you think it is possible to use
ftrace to measure secondary CPU bootup time?

Thanks,
Huang, Ying