linux-kernel - Re: [PATCH v5] arm64: implement ftrace with regs

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Message-ID: <CADGdYn5rrLZGrXUPA+HcKfA1pECYnwT0B1-j3YBzdt773zjORw@mail.gmail.com>
Date:   Mon, 17 Dec 2018 09:52:04 +0530
From:   Amit Daniel Kachhap <amit.kachhap@....com>
To:     duwe@....de
Cc:     Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        julien.thierry@....com, rostedt@...dmis.org, jpoimboe@...hat.com,
        mingo@...hat.com, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, takahiro.akashi@...aro.org,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org, live-patching@...r.kernel.org
Subject: Re: [PATCH v5] arm64: implement ftrace with regs

Hi,
On Sat, Dec 15, 2018 at 6:14 PM Torsten Duwe <duwe@....de> wrote:
>
> On Fri, 14 Dec 2018 21:45:03 +0530
> Amit Daniel Kachhap <amit.kachhap@....com> wrote:
>
> > Sorry I didn't mention my environment. I am using 4.20-rc3 and it has
> > all the above 8 extra patches
> > mentioned by you.
>
> So that should be fine.
ok thanks.
>
> > I read your change description in v3 patchset. You had mentioned there
> > that graph caller
> > is broken.
>
> No, actually I thought I had fixed that for v4. Would you care to show
> us an actual error message or some symptom?
There is no error message or crash but no useful output like below,

/sys/kernel/tracing # echo wake_up_process > set_graph_function
/sys/kernel/tracing # echo function_graph > current_tracer
/sys/kernel/tracing # cat trace
# tracer: function_graph
#
# CPU  DURATION                  FUNCTION CALLS
# |     |   |                     |   |   |   |

//Amit
>
>         Torsten