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

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Date:   Wed, 30 May 2018 10:43:46 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jin Yao <yao.jin@...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 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.

> +		PyObject *pyelem;
> +
> +		pyelem = PyDict_New();
> +		if (!pyelem)
> +			Py_FatalError("couldn't create Python dictionary");
> +

I think we need a field for the dso here.

> +		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));

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

Thanks,

-Andi