linux-kernel - Re: [PATCH RFC v5 01/13] perf jevents: Add support for an extra directory level

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Date:   Wed, 18 Nov 2020 10:08:31 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     John Garry <john.garry@...wei.com>, acme@...nel.org,
        will@...nel.org, mark.rutland@....com, jolsa@...hat.com,
        irogers@...gle.com, leo.yan@...aro.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org, mathieu.poirier@...aro.org
Cc:     linuxarm@...wei.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, qiangqing.zhang@....com,
        zhangshaokun@...ilicon.com, linux-imx@....com
Subject: Re: [PATCH RFC v5 01/13] perf jevents: Add support for an extra
 directory level



On 11/13/20 2:54 PM, John Garry wrote:
> On 13/11/2020 08:48, kajoljain wrote:
>>
>> On 11/6/20 6:05 PM, John Garry wrote:
>>> Currently only upto a level 2 directory is supported, in form
>>> vendor/platform.
>> Hi John,
>>      Just want to check in case of sub directories,
>> Will it be good add on/feasible to be able to include events of particular sub-directory for a
>> platform? Otherwise with this patch in the end all event will be part of
>> same pmu_event structure. So what is the purpose of sub directories? Let me know if I am missing something.
> 
> Hi Kajol Jain,
> 
> So currently we support both of the following structure:
> arch/platform
> arch/vendor/platform/
> 
> arch/vendor/platform/ is for an arch like arm, where the arch provider may not be the vendor.
> 
> I want to go one step further, to support also:
> arch/vendor/platform/cpu
> arch/vendor/platform/sys
> 
> Here we have separate folders for cpu and sys events. CPU events in "cpu" folder are added to pmu_events_map[], as before. And events in "sys" folder are added from patch 2/13 to new table pmu_sys_events_table[].
> 
> I hope it's clearer now.

Hi John,
    Thanks for explaining. This patch looks good to me then.

Reviewed-By: Kajol Jain<kjain@...ux.ibm.com>

Thanks,
Kajol Jain
> 
> Thanks,
> John
> 
>>
>> Thanks,
>> Kajol Jain
>>> Add support for a further level, to support vendor/platform
>>> sub-directories in future.
>