From: Steven Rostedt <rostedt@goodmis.org>
To: Amit Virdi <amitvi128@gmail.com>
Cc: fweisbec@gmail.com, mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: Enabling ftrace on ARM MMU-less system
Date: Tue, 30 Sep 2014 09:03:31 -0400 [thread overview]
Message-ID: <20140930090331.15a7b428@gandalf.local.home> (raw)
In-Reply-To: <CAEOkp47rz9-V_qZkOGDjfsZQj5bRHq2hf8dghS3xRcwdrP9UzQ@mail.gmail.com>
On Tue, 30 Sep 2014 16:26:49 +0530
Amit Virdi <amitvi128@gmail.com> wrote:
> Hi,
>
> I'm trying to enable Ftrace on my ARM based MMU-less system.
> Unexpectedly, I don't see tracing directory under /sys/kernel/debug
> I have done the following so far but no success:
> 1. Verified that I have enabled these flags in my .config
> CONFIG_FUNCTION_TRACER
> CONFIG_FUNCTION_GRAPH_TRACER
> CONFIG_STACK_TRACER
> CONFIG_DYNAMIC_FTRACE
>
> 2. Enabled Ftrace startup steps. The startup log output is
> ----
>
> Can anyone help what I'm missing or if ftrace is supported on MMU-less
> platforms?
Well it's obviously supported if you see the tests running.
Is there anything else under /sys/kernel/debug? If not you need to
mount the debugfs filesytem there. It wont do it itself.
# mount -t debugfs nodev /sys/kernel/debug
-- Steve
prev parent reply other threads:[~2014-09-30 13:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-30 10:56 Amit Virdi
2014-09-30 10:58 ` Amit Virdi
2014-09-30 13:03 ` Steven Rostedt [this message]
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