From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Danilo Cezar Zanella <danilo.zanella@iag.usp.br>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: Exception in function_graph tracing
Date: Fri, 16 Sep 2022 22:05:53 +0200 [thread overview]
Message-ID: <YyTXIUjq9tmFPTDi@linutronix.de> (raw)
In-Reply-To: <CAAxUTH4zpibkhOS+NPzcYsXFqx1bJfSU19gdt0eCAOrpWAkinA@mail.gmail.com>
On 2022-09-13 16:21:27 [-0300], Danilo Cezar Zanella wrote:
> Hi
Hi,
> I'm getting the following error message when I set the current_tracer
> to function_graph. Procedures:
>
> cd / sys/kernel/tracing
> echo function_graph > current_tracer
>
> Then I saw the following message in the console.
>
> Unable to handle kernel paging request at virtual address fffffffc
…
> What is going on?
> Am I doing something wrong?
No, not as far I can tell. It looks like the function_graph tracer is
busted in v4.19 even without the PREEMPT_RT patch. The function tracer
seems to work.
> Thanks
>
> Danilo
Sebastian
next prev parent reply other threads:[~2022-09-16 20:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-13 19:21 Exception in function_graph tracing Danilo Cezar Zanella
2022-09-16 20:05 ` Sebastian Andrzej Siewior [this message]
[not found] ` <CAAxUTH4xawCFpnwpRkcaZ5fdzMEbZZmPOyVDoqdMrPrf+G64dg@mail.gmail.com>
2022-09-27 11:06 ` Sebastian Andrzej Siewior
2022-10-05 8:43 ` [PATCH] ARM: fix function graph tracer and unwinder dependencies Sebastian Andrzej Siewior
2022-10-05 16:43 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YyTXIUjq9tmFPTDi@linutronix.de \
--to=bigeasy@linutronix.de \
--cc=danilo.zanella@iag.usp.br \
--cc=linux-rt-users@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.