linux-kernel - Re: [PATCH V4 00/13] perf/x86: Add perf text poke events

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Message-ID: <25dee9c8-afcc-2541-6456-41ea17f9150b@intel.com>
Date:   Tue, 24 Mar 2020 11:29:49 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        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>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 00/13] perf/x86: Add perf text poke events

On 16/03/20 9:07 am, Adrian Hunter wrote:
> On 4/03/20 11:06 am, Adrian Hunter wrote:
>> Hi
>>
>> Here are patches to add a text poke event to record changes to kernel text
>> (i.e. self-modifying code) in order to support tracers like Intel PT
>> decoding through jump labels, kprobes and ftrace trampolines.
>>
>> The first 8 patches make the kernel changes and the subsequent patches are
>> tools changes.
>>
>> The next 4 patches add support for updating perf tools' data cache
>> with the changed bytes.
>>
>> The last patch is an Intel PT specific tools change.
>>
>> Patches also here:
>>
>> 	git://git.infradead.org/users/ahunter/linux-perf.git text_poke
> 
> Any comments?

Peter, do you have any comments on the first 2 patches?  They are pretty
much what we have already discussed.