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

Jin, Yao
2018-05-31T05:41:15Z

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
>