linux-kernel - Re: [PATCH v2 10/11] perf python: Add evlist.config to set up record options

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Message-ID: <Z89SyJNCILErEwAb@x1>
Date: Mon, 10 Mar 2025 17:59:52 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Yicong Yang <yangyicong@...ilicon.com>,
	James Clark <james.clark@...aro.org>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Levi Yun <yeoreum.yun@....com>, Ze Gao <zegao2021@...il.com>,
	Weilin Wang <weilin.wang@...el.com>, Xu Yang <xu.yang_2@....com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Howard Chu <howardchu95@...il.com>
Subject: Re: [PATCH v2 10/11] perf python: Add evlist.config to set up record
 options

On Fri, Feb 28, 2025 at 02:23:07PM -0800, Ian Rogers wrote:
> Add access to evlist__config that is used to configure an evlist with
> record options.

I guess nothing precludes adding support later for passing fields as an
optional dictionary, so I think its ok to have it with the name "config"
but being more of a "default_config".

Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>

- Arnaldo
 
> Reviewed-by: Howard Chu <howardchu95@...il.com>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/python.c | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
> index c55c8392bc07..69ec2ad60d98 100644
> --- a/tools/perf/util/python.c
> +++ b/tools/perf/util/python.c
> @@ -9,10 +9,12 @@
>  #include <event-parse.h>
>  #endif
>  #include <perf/mmap.h>
> +#include "callchain.h"
>  #include "evlist.h"
>  #include "evsel.h"
>  #include "event.h"
>  #include "print_binary.h"
> +#include "record.h"
>  #include "strbuf.h"
>  #include "thread_map.h"
>  #include "trace-event.h"
> @@ -1052,6 +1054,31 @@ static PyObject *pyrf_evlist__open(struct pyrf_evlist *pevlist,
>  	return Py_None;
>  }
>  
> +static PyObject *pyrf_evlist__config(struct pyrf_evlist *pevlist)
> +{
> +	struct record_opts opts = {
> +		.sample_time	     = true,
> +		.mmap_pages	     = UINT_MAX,
> +		.user_freq	     = UINT_MAX,
> +		.user_interval	     = ULLONG_MAX,
> +		.freq		     = 4000,
> +		.target		     = {
> +			.uses_mmap   = true,
> +			.default_per_cpu = true,
> +		},
> +		.nr_threads_synthesize = 1,
> +		.ctl_fd              = -1,
> +		.ctl_fd_ack          = -1,
> +		.no_buffering        = true,
> +		.no_inherit          = true,
> +	};
> +	struct evlist *evlist = &pevlist->evlist;

> +	evlist__config(evlist, &opts, &callchain_param);
> +	Py_INCREF(Py_None);
> +	return Py_None;
> +}
> +
>  static PyObject *pyrf_evlist__disable(struct pyrf_evlist *pevlist)
>  {
>  	evlist__disable(&pevlist->evlist);
> @@ -1109,6 +1136,12 @@ static PyMethodDef pyrf_evlist__methods[] = {
>  		.ml_flags = METH_VARARGS | METH_KEYWORDS,
>  		.ml_doc	  = PyDoc_STR("reads an event.")
>  	},
> +	{
> +		.ml_name  = "config",
> +		.ml_meth  = (PyCFunction)pyrf_evlist__config,
> +		.ml_flags = METH_NOARGS,
> +		.ml_doc	  = PyDoc_STR("Apply default record options to the evlist.")
> +	},
>  	{
>  		.ml_name  = "disable",
>  		.ml_meth  = (PyCFunction)pyrf_evlist__disable,
> -- 
> 2.48.1.711.g2feabab25a-goog