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: Tue, 27 Sep 2022 13:06:09 +0200 [thread overview]
Message-ID: <YzLZIX+Pi6lyIr1f@linutronix.de> (raw)
In-Reply-To: <CAAxUTH4xawCFpnwpRkcaZ5fdzMEbZZmPOyVDoqdMrPrf+G64dg@mail.gmail.com>
On 2022-09-16 17:28:00 [-0300], Danilo Cezar Zanella wrote:
> Hi Sebastian,
Hi Danilo,
please don't lose the list.
> > No, not as far I can tell.
> It sounds good. ;-)
>
> > It looks like the function_graph tracer is busted in v4.19 even without the PREEMPT_RT patch.
> It sounds bad... :-(
>
> I'm new in LKM development and even more in Kernel tracing.
> I've tested 'nop' and 'function' tracing, both seem to work. Do you
> know when this issue was solved? Perhaps could I do a backport of
> it(if it is easy, of course)?
I managed to reproduce it on v4.19 but on v6.0-rcX. So it must have
been fixed somehow in between. I browsed the history but I did not
notice anything obvious.
So someone needs to dig deeper…
> Thank you again
>
> Danilo
Sebastian
next prev parent reply other threads:[~2022-09-27 11:08 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
[not found] ` <CAAxUTH4xawCFpnwpRkcaZ5fdzMEbZZmPOyVDoqdMrPrf+G64dg@mail.gmail.com>
2022-09-27 11:06 ` Sebastian Andrzej Siewior [this message]
2022-10-05 8:43 ` [PATCH] ARM: fix function graph tracer and unwinder dependencies Sebastian Andrzej Siewior
2022-10-05 16:43 ` Greg KH
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