Re: [PATCH RFC 3/7] perf jevents: Add support for a system events PMU

[John Garry]

On 10/02/2020 12:07, Jiri Olsa wrote:
> On Fri, Jan 24, 2020 at 10:35:01PM +0800, John Garry wrote:
>
> SNIP
>
> >   	- Set of 'PMU events tables' for all known CPUs in the architecture,
> > @@ -83,11 +93,11 @@ NOTES:
> >   	2. The 'pmu-events.h' has an extern declaration for the mapping table
> >   	   and the generated 'pmu-events.c' defines this table.
> >   
> > -	3. _All_ known CPU tables for architecture are included in the perf
> > -	   binary.
> > +	3. _All_ known CPU and system tables for architecture are included in
> > +	   the perf binary.
> >   
> > -At run time, perf determines the actual CPU it is running on, finds the
> > -matching events table and builds aliases for those events. This allows
> > +At run time, perf determines the actual CPU or system it is running on, finds
> > +the matching events table and builds aliases for those events. This allows
> >   users to specify events by their name:
> >   
> >   	$ perf stat -e pm_1plus_ppc_cmpl sleep 1
> > @@ -150,3 +160,18 @@ where:
> >   
> >   	i.e the three CPU models use the JSON files (i.e PMU events) listed
> >   	in the directory 'tools/perf/pmu-events/arch/x86/silvermont'.
> > +
> > +The mapfile_sys.csv format is slightly different, in that it contains a SYSID
> > +instead of the CPUID:
> > +
> > +	Header line
> > +	SYSID,Version,Dir/path/name,Type

Hi jirka,

> can't we just add prefix to SYSID types? like:
>
> 	SYSID-HIP08,v1,hisilicon/hip08/sys,sys
> 	0x00000000480fd010,v1,hisilicon/hip08/cpu,core
> 	0x00000000500f0000,v1,ampere/emag,core
>
> because the rest of the line is the same, right?

I did consider that already. It should be workable.

> seems to me that having one mapfile type would be less confusing

I thought that having it all in a single file would be more confusing :)

>
As for this separate comment:

>> +		if (!strcmp(bname, "mapfile_sys.csv")) {
>> +			mapfile_sys = strdup(fpath);
>
>
> we could release that in the cleanup code at the end of main
> together with 'mapfile',

That should now go away.

>  which is also missing

Right, I'll look to fix that.

Thanks,
John

> .