linux-kernel - Re: [PATCH V2 03/13] kprobes: Add symbols for kprobe insn pages

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Message-ID: <435d04f9-15c7-e153-ac19-d9d7bebc170a@intel.com>
Date:   Thu, 27 Feb 2020 09:13:51 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 03/13] kprobes: Add symbols for kprobe insn pages

On 26/02/20 5:22 pm, Jiri Olsa wrote:
> On Wed, Feb 12, 2020 at 02:49:39PM +0200, Adrian Hunter wrote:
>> Symbols are needed for tools to describe instruction addresses. Pages
>> allocated for kprobe's purposes need symbols to be created for them.
>> Add such symbols to be visible via /proc/kallsyms.
> 
> I can't see kprobes in /proc/kallsyms, I tried making some with
> perf probe and some of bcc-tools.. I'm greping for [kprobe]
> 
> could you put to changelog soem example /proc/kallsyms output?

Will do.  See also the examples in patch 13.

For kprobes you need:

	# CONFIG_FUNCTION_TRACER is not set

otherwise the kprobes are done by ftrace.