Is it possible to use ftrace to measure secondary CPU bootup time

From	"Huang\, Ying" <ying.huang@intel.com>
Newsgroups	linux.kernel
Subject	Is it possible to use ftrace to measure secondary CPU bootup time
Date	2017-07-24 07:50 +0200
Message-ID	<u6EpH-Fb-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Show all headers | View raw

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

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Is it possible to use ftrace to measure secondary CPU bootup time "Huang\, Ying" <ying.huang@intel.com> - 2017-07-24 07:50 +0200
  Re: Is it possible to use ftrace to measure secondary CPU bootup  time Steven Rostedt <rostedt@goodmis.org> - 2017-07-24 11:20 +0200
    RE: Is it possible to use ftrace to measure secondary CPU bootup  time "Brandt, Todd E" <todd.e.brandt@intel.com> - 2017-07-24 23:50 +0200
      Re: Is it possible to use ftrace to measure secondary CPU bootup  time Steven Rostedt <rostedt@goodmis.org> - 2017-07-26 23:30 +0200
    Re: Is it possible to use ftrace to measure secondary CPU bootup time "Huang\, Ying" <ying.huang@intel.com> - 2017-07-25 02:40 +0200

csiph-web