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From: Christian Convey <christian.convey@gmail.com>
To: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
	Milian Wolff <milian.wolff@kdab.com>,
	linux-perf-users <linux-perf-users@vger.kernel.org>
Subject: Re: newbie question: tracing userspace call/return sequences
Date: Mon, 9 Jan 2017 12:59:38 -0500	[thread overview]
Message-ID: <CAPfS4ZxuWKhR2KXvkTQf9om5DcAsC_D2sQE5KC-eJNv6GDREyQ@mail.gmail.com> (raw)
In-Reply-To: <20170109170354.GD13299@naverao1-tp.localdomain>

On Mon, Jan 9, 2017 at 12:03 PM, Naveen N. Rao
<naveen.n.rao@linux.vnet.ibm.com> wrote:
...
> On 2017/01/09 10:19AM, Christian Convey wrote:
> Try compiling your program with -O2, or use a newer perf:
> https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/commit/?id=e47392bf9c0613a058cd20ee89d8ce9d957d4b24

Thanks for the suggestion.  I switched from -O0 to -O2, and
unfortunately I could no longer add the probe events at all:

cconvey@spaceman ~/dw/scratch/cconvey/src/fib $ sudo -E
${PERF_EXEC_PATH}/perf probe --exec=./fib -f --add='* $params'
Failed to write event: Invalid argument
Please upgrade your kernel to at least 3.14 to have access to feature @__fmt
 Error: Failed to add events.

cconvey@spaceman ~/dw/scratch/cconvey/src/fib $ sudo -E
${PERF_EXEC_PATH}/perf --version
perf version 4.8.11

cconvey@spaceman ~/dw/scratch/cconvey/src/fib $ uname -a
Linux spaceman 4.8.0-32-generic #34-Ubuntu SMP Tue Dec 13 14:30:43 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux


- Christian

  reply	other threads:[~2017-01-09 17:59 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-06  3:49 newbie question: tracing userspace call/return sequences Christian Convey
2017-01-06 10:16 ` Milian Wolff
2017-01-06 20:05   ` Christian Convey
2017-01-07 23:44     ` Masami Hiramatsu
2017-01-09 15:19       ` Christian Convey
2017-01-09 17:03         ` Naveen N. Rao
2017-01-09 17:59           ` Christian Convey [this message]
2017-01-10  0:25             ` Masami Hiramatsu
2017-01-10  2:32               ` Christian Convey
2017-01-06 18:49 ` Andi Kleen
2017-01-06 19:07   ` Christian Convey
2017-01-07  4:37     ` Namhyung Kim
2017-01-07 18:26       ` Christian Convey
2017-01-07 19:08       ` Andi Kleen
2017-01-08  8:08         ` Namhyung Kim
2017-01-06 19:23   ` Arnaldo Carvalho de Melo
2017-01-09 17:20 ` Frank Ch. Eigler
2017-01-09 18:08   ` Christian Convey

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