From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Yang Shi <yang.shi@windriver.com>
Cc: He Zhe <zhe.he@windriver.com>,
Steven Rostedt <rostedt@goodmis.org>,
tglx@linutronix.de, linux-rt-users@vger.kernel.org
Subject: Re: 4.8.6-rt5 ftrace function_graph hangs
Date: Tue, 6 Dec 2016 12:07:15 +0100 [thread overview]
Message-ID: <20161206110715.3mnfjzflaq3semrd@linutronix.de> (raw)
In-Reply-To: <433512e3-cb70-a6dc-395b-4afb827734f9@windriver.com>
On 2016-12-02 13:42:06 [-0800], Yang Shi wrote:
> Hi Sebastian,
Hi Yang,
> Thanks for following up. I had been distracted by something else. And, I did
> more testing, then I narrowed it down to ARM and PPC only.
okay.
> In addition, I narrowed it down to CONFIG_DEBUG_PREEMPT. function_graph
> tracer works well with it disabled on ARM and PPC. But, I haven't got time
> to figure out why.
It could be a warning that comes with CONFIG_DEBUG_PREEMPT triggers once
function_graph gets enabled. This warning in turn could cause another
warning or go for another reason recursive.
> Yang
>
Sebastian
prev parent reply other threads:[~2016-12-06 11:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-18 6:23 4.8.6-rt5 ftrace function_graph hangs He Zhe
2016-11-18 16:35 ` Steven Rostedt
2016-11-18 18:36 ` Yang Shi
2016-11-18 22:32 ` Steven Rostedt
2016-11-21 8:26 ` He Zhe
2016-11-21 8:30 ` He Zhe
2016-11-21 14:45 ` Steven Rostedt
2016-11-28 14:33 ` Sebastian Andrzej Siewior
2016-12-02 21:42 ` Yang Shi
2016-12-06 11:07 ` Sebastian Andrzej Siewior [this message]
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