linux-kernel - RE: ftrace function_graph causes system crash

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Date:   Thu, 22 Sep 2016 08:36:41 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Jisheng Zhang <jszhang@...vell.com>
CC:     "Zoltan Szubbocsev (zszubbocsev)" <zszubbocsev@...ron.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "rfi@...ts.rocketboards.org" <rfi@...ts.rocketboards.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: ftrace function_graph causes system crash

> -----Original Message-----
> From: Steven Rostedt [mailto:rostedt@...dmis.org]
> Sent: Mittwoch, 21. September 2016 20:17
> To: Jisheng Zhang <jszhang@...vell.com>
> Cc: Bean Huo (beanhuo) <beanhuo@...ron.com>; Zoltan Szubbocsev
> (zszubbocsev) <zszubbocsev@...ron.com>; catalin.marinas@....com;
> will.deacon@....com; rfi@...ts.rocketboards.org; linux-
> kernel@...r.kernel.org; mingo@...hat.com; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: ftrace function_graph causes system crash
> 
> On Wed, 21 Sep 2016 17:13:07 +0800
> Jisheng Zhang <jszhang@...vell.com> wrote:
> 
> > I'm not sure whether the commit d6df3576e6b4
> ("clocksource/drivers/arm_global_timer
> > : Prevent ftrace recursion") can fix this issue.
> >
> > this commit is merged since v4.3, I noticed your kernel version is v4.0
> 
> BTW, yes, that would be the fix.
> 
> -- Steve
> 
> >
> > Thanks,
> > Jisheng
> >
> > > Do you know now how to deeply debug and trace which line is wrong
> through Ftrace?
> > >

Hi, Steven and Jisheng
Thanks to both warm-hearted guys. I merged  d6df3576e6b4 patch into my kernel 4.0.
Then it is true, no cash appears again.

I have one more question that current ftrace can trace DMA latency, include mapping and unmapping?
Means I want to know when one BIO request be completed. Just like blktrace.
But blktrace can not tell me the function calling sequence.

--Bean