linux-kernel - Re: [PATCH v2 1/3] perf header: Support HYBRID

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Date:   Tue, 11 May 2021 09:05:55 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v2 1/3] perf header: Support HYBRID_TOPOLOGY feature

Hi Jiri,

On 5/10/2021 9:11 PM, Jiri Olsa wrote:
> On Fri, May 07, 2021 at 11:52:28AM +0800, Jin Yao wrote:
>> It would be useful to let user know the hybrid topology.
>> Adding HYBRID_TOPOLOGY feature in header to indicate the
>> core cpus and the atom cpus.
>>
>> With this patch,
>>
>> For the perf.data generated on hybrid platform,
>> reports the hybrid cpu list.
>>
>>    root@...pl-adl-s-2:~# perf report --header-only -I
>>    ...
>>    # hybrid cpu system:
>>    # cpu_core cpu list : 0-15
>>    # cpu_atom cpu list : 16-23
>>
>> For the perf.data generated on non-hybrid platform,
>> reports the message that HYBRID_TOPOLOGY is missing.
>>
>>    root@...-ppc:~# perf report --header-only -I
>>    ...
>>    # missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA HYBRID_TOPOLOGY
>>
>> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
>> ---
>>   .../Documentation/perf.data-file-format.txt   | 14 +++
>>   tools/perf/util/cputopo.c                     | 80 +++++++++++++++++
>>   tools/perf/util/cputopo.h                     | 13 +++
>>   tools/perf/util/env.c                         |  6 ++
>>   tools/perf/util/env.h                         |  7 ++
>>   tools/perf/util/header.c                      | 87 +++++++++++++++++++
>>   tools/perf/util/header.h                      |  1 +
>>   tools/perf/util/pmu-hybrid.h                  | 11 +++
>>   8 files changed, 219 insertions(+)
>>
>> diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
>> index 9ee96640744e..d9d82ca8aeb7 100644
>> --- a/tools/perf/Documentation/perf.data-file-format.txt
>> +++ b/tools/perf/Documentation/perf.data-file-format.txt
>> @@ -402,6 +402,20 @@ struct {
>>   	u64 clockid_time_ns;
>>   };
>>   
>> +	HEADER_HYBRID_TOPOLOGY = 30,
>> +
>> +Indicate the hybrid CPUs. The format of data is as below.
>> +
>> +struct {
>> +	char *pmu_name;
>> +	char *cpus;
>> +};
> 
> this is missing the nr count, should be like:
> 
> struct {
> 	u32 nr;
> 	struct {
> 	     char *pmu_name;
> 	     char *cpus;
> 	} [nr]
> }
> 
> jirka
> 

Yes, we should say the format of data is:

struct {
	u32 nr;
	struct {
		char *pmu_name;
		char *cpus;
	} [nr]
}

I will update 'perf.data-file-format.txt' in v3.

Thanks
Jin Yao