linux-kernel - Re: [PATCH] perf evsel: Don't set sample_regs_intr/sample_regs

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Date:   Fri, 17 Jul 2020 16:30:21 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <Linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>, kan.liang@...el.com,
        "Jin, Yao" <yao.jin@...el.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] perf evsel: Don't set sample_regs_intr/sample_regs_user
 for dummy event



On 7/17/2020 4:24 PM, Jiri Olsa wrote:
> On Fri, Jul 17, 2020 at 11:33:46AM +0800, Jin, Yao wrote:
>> Hi,
>>
>> On 7/6/2020 8:55 AM, Jin, Yao wrote:
>>> Hi Ian,
>>>
>>> On 7/6/2020 8:47 AM, Ian Rogers wrote:
>>>> On Fri, Jul 3, 2020 at 5:31 PM Jin, Yao <yao.jin@...ux.intel.com> wrote:
>>>>>
>>>>> Hi Jiri,
>>>>>
>>>>> On 7/3/2020 7:00 PM, Jiri Olsa wrote:
>>>>>> On Fri, Jul 03, 2020 at 08:42:15AM +0800, Jin Yao wrote:
>>>>>>> Since commit 0a892c1c9472 ("perf record: Add dummy event during system wide synthesis"),
>>>>>>> a dummy event is added to capture mmaps.
>>>>>>>
>>>>>>> But if we run perf-record as,
>>>>>>>
>>>>>>>     # perf record -e cycles:p -IXMM0 -a -- sleep 1
>>>>>>>     Error:
>>>>>>>     dummy:HG: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'
>>>>>>>
>>>>
>>>> Sorry for the breakage caused by modifying the dummy event. Could we
>>>> add a test to cover the issue? Perhaps in tools/perf/tests/shell/.
>>>> Trying to reproduce with a register on my skylakex on a 5.6.14 kernel
>>>> with:
>>>>
>>>> $ perf record -e cycles:p -IAX -a -- sleep 1
>>>>
>>>> succeeds.
>>>>
>>>> Thanks,
>>>> Ian
>>>>
>>>
>>> -IAX should be no problem. The issue only occurs on the platform with
>>> extended regs supports, such as ICL. So I don't know if it's suitable to
>>> add it to perf test suite.
>>>
>>> Thanks
>>> Jin Yao
>>>
>>
>> Can this fix patch be accepted?
> 
> hi,
> my only concern was that it would conflict with Adrian's patch,
> other than that:
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>
> 
> thanks,
> jirka
> 

Thanks Jiri!

Adrian's patch has not been merged otherwise I can rebase my patch on top of Adrian's patch.

Thanks
Jin Yao