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

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Message-ID: <20181217133450.GB5774@lst.de>
Date:   Mon, 17 Dec 2018 14:34:52 +0100
From:   Torsten Duwe <duwe@....de>
To:     Amit Daniel Kachhap <amit.kachhap@....com>
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

On Mon, Dec 17, 2018 at 09:52:04AM +0530, Amit Daniel Kachhap wrote:
> 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
> # |     |   |                     |   |   |   |

Confirmed. The graph tracer self-test passes, but when used, there is no
output.

	Torsten