From: Steven Rostedt <rostedt@goodmis.org>
To: Itai Handler <itai.handler@gmail.com>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: aarch64 boot time increases with rt
Date: Tue, 14 Jul 2020 10:34:43 -0400 [thread overview]
Message-ID: <20200714103443.31895064@oasis.local.home> (raw)
In-Reply-To: <CAFpOueRmBfzhPFb-q_pB1xpCQq4Cuo7rCCsc2eUPsGdaei-+3A@mail.gmail.com>
On Tue, 14 Jul 2020 15:18:01 +0300
Itai Handler <itai.handler@gmail.com> wrote:
> I tried "ftrace=function_graph ftrace_graph_filter=workqueue_prepare_cpu",
> however, the trace appears to be empty.
> The function workqueue_prepare_cpu is not defined inline nor notrace.
>
> Please see log below:
> # mount -t debugfs none /sys/kernel/debug
> # cd /sys/kernel/debug/tracing/
> # cat trace
> # tracer: function_graph
> #
> # CPU DURATION FUNCTION CALLS
> # | | | | | | |
> # cat set_graph_function
> workqueue_prepare_cpu
> # cat tracing_on
> 1
>
> Do you have any idea why it's empty?
Hmm, does the place in question happen before ftrace is initialized?
That is, where do you see the message that has something like this:
ftrace: allocating 41803 entries in 164 pages
ftrace: allocated 164 pages with 3 groups
-- Steve
next prev parent reply other threads:[~2020-07-14 14:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-13 14:56 aarch64 boot time increases with rt Itai Handler
2020-07-14 1:20 ` Steven Rostedt
2020-07-14 12:18 ` Itai Handler
2020-07-14 14:34 ` Steven Rostedt [this message]
2020-07-15 19:36 ` Steven Rostedt
2020-07-16 13:04 ` Itai Handler
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