Commit 5bae0250 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf evlist: Introduce perf_evlist__new_dummy constructor 

For case where all we need is an evlist with just an "dummy" evsel,
like in some 'perf test' entries.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-q52le0pblm2k3ncvyilelr9z@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 4f4ba0e6

tools/perf/util/evlist.c

+28 −0
Original line number Diff line number Diff line
@@ -68,6 +68,18 @@ struct perf_evlist *perf_evlist__new_default(void) 
	return evlist;

}



struct perf_evlist *perf_evlist__new_dummy(void)

{

	struct perf_evlist *evlist = perf_evlist__new();



	if (evlist && perf_evlist__add_dummy(evlist)) {

		perf_evlist__delete(evlist);

		evlist = NULL;

	}



	return evlist;

}



/**

 * perf_evlist__set_id_pos - set the positions of event ids.

 * @evlist: selected event list
@@ -248,6 +260,22 @@ error: 
	return -ENOMEM;

}



int perf_evlist__add_dummy(struct perf_evlist *evlist)

{

	struct perf_event_attr attr = {

		.type	= PERF_TYPE_SOFTWARE,

		.config = PERF_COUNT_SW_DUMMY,

		.size	= sizeof(attr), /* to capture ABI version */

	};

	struct perf_evsel *evsel = perf_evsel__new(&attr);



	if (evsel == NULL)

		return -ENOMEM;



	perf_evlist__add(evlist, evsel);

	return 0;

}



static int perf_evlist__add_attrs(struct perf_evlist *evlist,

				  struct perf_event_attr *attrs, size_t nr_attrs)

{

tools/perf/util/evlist.h

+3 −0
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ struct perf_evsel_str_handler { 


struct perf_evlist *perf_evlist__new(void);

struct perf_evlist *perf_evlist__new_default(void);

struct perf_evlist *perf_evlist__new_dummy(void);

void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,

		       struct thread_map *threads);

void perf_evlist__exit(struct perf_evlist *evlist);
@@ -81,6 +82,8 @@ int __perf_evlist__add_default_attrs(struct perf_evlist *evlist, 
#define perf_evlist__add_default_attrs(evlist, array) \

	__perf_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))



int perf_evlist__add_dummy(struct perf_evlist *evlist);



int perf_evlist__add_newtp(struct perf_evlist *evlist,

			   const char *sys, const char *name, void *handler);

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