linux-kernel - Re: [PATCH v2 00/11] perf metric fixes and test

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Date:   Fri, 24 Apr 2020 10:46:11 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Haiyan Song <haiyanx.song@...el.com>,
        Song Liu <songliubraving@...com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        Leo Yan <leo.yan@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Paul Clarke <pc@...ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 00/11] perf metric fixes and test



On 4/23/2020 10:31 PM, Ian Rogers wrote:
> On Thu, Apr 23, 2020 at 7:03 AM Jiri Olsa <jolsa@...hat.com> wrote:
>>
>> On Thu, Apr 23, 2020 at 09:44:24PM +0800, Jin, Yao wrote:
>>> Hi Jiri,
>>>
>>> On 4/23/2020 7:28 PM, Jiri Olsa wrote:
>>>> On Wed, Apr 22, 2020 at 03:04:19PM -0700, Ian Rogers wrote:
>>>>> Add a test that all perf metrics (for your architecture) are
>>>>> parsable. Fix bugs in the expr parser and in x86 metrics. Untested on
>>>>> architectures other than x86.
>>>>>
>>>>> v2 adds Fixes tags to commit messages for when broken metrics were
>>>>>     first added. Adds a debug warning for division by zero in expr, and
>>>>>     adds a workaround for id values in the expr test necessary for
>>>>>     powerpc. It also fixes broken power8 and power9 metrics.
>>>>
>>>> looks good to me
>>>>
>>>> Jin Yao, is there a metric that's not working for you with this patchset
>>>> applied?
>>>>
>>>> thanks,
>>>> jirka
>>>>
>>>
>>> Let me look for a CLX for testing, but maybe need some time.
>>>
>>> BTW, suppose this patchset can work well, does it mean we will change the
>>> json file format in future?
>>>
>>> For example,
>>>
>>> before:
>>> cha@...nt\\=0x36\\\\\\
>>>
>>> after:
>>> cha@...nt\\=0x36\\
>>>
>>> "\\\\" are removed.
>>>
>>> If so, we need to change our event generation script.
>>
>> ok, maybe I got the wrong idea that the extra \\\\ were just
>> superfluous, what was the actual error there? and what's the
>> reason for that many '\' in there?
> 
> I believe they are superfluous and break even before the flex change.
> I commented on it here with a reproduction of a parse events error on
> skylake:
> https://lore.kernel.org/lkml/CAP-5=fUnWAycQehCJ9=btquV2c3DVDX+tTEc85H8py9Kfehq4w@mail.gmail.com/
> 
> Fixing the script that generates this would be great! With the test
> landed it should be much harder for this to be broken in the future.
> 
> Thanks,
> Ian
> 

Tested on CLX and the error disappeared.

BTW, I will post the latest version of event list once the testing is 
completed.

Thanks
Jin Yao

> 
>> jirka
>>