linux-kernel - Re: a question about how to debug this case in ftrace

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Message-ID: <8734p0jhdc.fsf@jogness.linutronix.de>
Date: Wed, 26 Jun 2024 09:31:03 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Song Chen <chensong_2000@....cn>, Andrew Halaney <ahalaney@...hat.com>
Cc: Derek Barbosa <debarbos@...hat.com>, pmladek@...e.com,
 rostedt@...dmis.org, senozhatsky@...omium.org,
 linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 williams@...hat.com, jlelli@...hat.com
Subject: Re: a question about how to debug this case in ftrace

On 2024-06-26, Song Chen <chensong_2000@....cn> wrote:
> ohh, by the way, i'm curious why softlockup/hardlockup/hungtask don't
> have ftrace dump as well as rcu stall, or is it possible to add a
> parameter in cmdline to redirect
> softlockup/hardlockup/hungtask/rcustall warning either to ftrace or
> printk.

Are you aware of the printk:console ftrace event? If you enable it, all
printk output also goes into the ftrace buffers.

John Ogness