From: David Henningsson <david.henningsson@canonical.com>
To: "Lin, Mengdong" <mengdong.lin@intel.com>,
"alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>
Subject: Re: How to show hda trace events in a self-built kernel?
Date: Wed, 23 Apr 2014 10:31:39 +0200 [thread overview]
Message-ID: <53577A6B.2060400@canonical.com> (raw)
In-Reply-To: <F46914AEC2663F4A9BB62374E5EEF8F82B3F4357@SHSMSX101.ccr.corp.intel.com>
On 2014-04-23 09:35, Lin, Mengdong wrote:
> Hi,
>
> How to show hda trace events in a self-built kernel?
>
> With a self-built kernel under Ubuntu 13.04 or 13.10, I enabled hda
> trace events by
>
> #cd /sys/kernel/debug/tracing/
>
> #echo 1 > events/hda/enable
>
> #echo 1 > events/had_intel/enable
>
> Then I check the codec proc entry and run “cat trace”. But I got no
> output of the hda trace events.
Did you forget to do:
# echo 1 > tracing_on
You might also want to set current_tracer to something.
Otherwise I don't know what the problem can be.
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
next prev parent reply other threads:[~2014-04-23 8:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-23 7:35 How to show hda trace events in a self-built kernel? Lin, Mengdong
2014-04-23 8:31 ` David Henningsson [this message]
2014-04-23 9:21 ` Lin, Mengdong
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