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

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Date:   Mon, 10 Feb 2020 15:55:00 +0000
From:   John Garry <john.garry@...wei.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <namhyung@...nel.org>, <will@...nel.org>, <ak@...ux.intel.com>,
        <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <suzuki.poulose@....com>,
        <james.clark@....com>, <zhangshaokun@...ilicon.com>,
        <robin.murphy@....com>
Subject: Re: [PATCH RFC 3/7] perf jevents: Add support for a system events PMU

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

> .
>