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

[John Garry]

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.

Thanks,
John

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