linux-kernel - Re: [PATCH] perf util: Add more PMU fields for perf script python

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Date:   Thu, 31 May 2018 13:41:10 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, kan.liang@...el.com,
        yao.jin@...el.com
Subject: Re: [PATCH] perf util: Add more PMU fields for perf script python



On 5/31/2018 1:43 AM, Andi Kleen wrote:
> On Wed, May 30, 2018 at 10:20:45PM +0800, Jin Yao wrote:
>> When doing pmu sampling and then running a script with
>> perf script -s script.py, the process_event function gets
>> dictionary with some fields from the perf ring buffer
>> (like ip, sym, callchain etc).
>>
>> But we miss quite a few fields we report now, for example,
>> LBRs,data source,weight,transaction,iregs,uregs,and etc.
>>
>> This patch reports these fields for perf script python
>> processing.
> 
> We need documentation and an example script using it.
> 

OK, I will add an example with some field explanations to 
Documentation/perf-script-python.txt.

>> +		PyObject *pyelem;
>> +
>> +		pyelem = PyDict_New();
>> +		if (!pyelem)
>> +			Py_FatalError("couldn't create Python dictionary");
>> +
> 
> I think we need a field for the dso here.
>

I will add new fields "from_dsoname" and "to_dsoname" in v2.

>> +		pydict_set_item_string_decref(pyelem, "from",
>> +		    PyLong_FromUnsignedLongLong(br->entries[i].from));
>> +		pydict_set_item_string_decref(pyelem, "to",
>> +		    PyLong_FromUnsignedLongLong(br->entries[i].to));
>> +		pydict_set_item_string_decref(pyelem, "mispred",
>> +		    PyLong_FromUnsignedLongLong(br->entries[i].flags.mispred));
>> +		pydict_set_item_string_decref(pyelem, "predicted",
>> +		    PyLong_FromUnsignedLongLong(br->entries[i].flags.predicted));
>> +		pydict_set_item_string_decref(pyelem, "in_tx",
>> +		    PyLong_FromUnsignedLongLong(br->entries[i].flags.in_tx));
>> +		pydict_set_item_string_decref(pyelem, "abort",
> 
> 
> These could be booleans.
> 
>> +		    PyLong_FromUnsignedLongLong(br->entries[i].flags.abort));
>> +		pydict_set_item_string_decref(pyelem, "cycles",
>> +		    PyLong_FromUnsignedLongLong(br->entries[i].flags.cycles));

I will use PyBool_FromLong() for mispred/predicted/in_tx/abort in v2.

> 
> Would be nice to get access to the binary code too (see how perf script
> brstackinsn does it). That could be a followon patch.
>

OK, fine, I will see how perf script brstackinsn does.

Thanks
Jin Yao

> Thanks,
> 
> -Andi
>