Commit 9a399944 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf evlist: Move the sideband thread routines to separate object 



To avoid dragging more stuff into the perf python binding in the
following csets.

Reported-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent d0abbc3c

tools/perf/util/Build

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ perf-y += db-export.o 
perf-y += env.o

perf-y += event.o

perf-y += evlist.o

perf-y += sideband_evlist.o

perf-y += evsel.o

perf-y += evsel_fprintf.o

perf-y += perf_event_attr_fprintf.o

tools/perf/util/evlist.c

+0 −117
Original line number Diff line number Diff line
@@ -1704,120 +1704,3 @@ struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list, 
	}

	return leader;

}
 


int perf_evlist__add_sb_event(struct evlist *evlist,

			      struct perf_event_attr *attr,

			      perf_evsel__sb_cb_t cb,

			      void *data)

{

	struct evsel *evsel;



	if (!attr->sample_id_all) {

		pr_warning("enabling sample_id_all for all side band events\n");

		attr->sample_id_all = 1;

	}



	evsel = perf_evsel__new_idx(attr, evlist->core.nr_entries);

	if (!evsel)

		return -1;



	evsel->side_band.cb = cb;

	evsel->side_band.data = data;

	evlist__add(evlist, evsel);

	return 0;

}



static void *perf_evlist__poll_thread(void *arg)

{

	struct evlist *evlist = arg;

	bool draining = false;

	int i, done = 0;

	/*

	 * In order to read symbols from other namespaces perf to needs to call

	 * setns(2).  This isn't permitted if the struct_fs has multiple users.

	 * unshare(2) the fs so that we may continue to setns into namespaces

	 * that we're observing when, for instance, reading the build-ids at

	 * the end of a 'perf record' session.

	 */

	unshare(CLONE_FS);



	while (!done) {

		bool got_data = false;



		if (evlist->thread.done)

			draining = true;



		if (!draining)

			evlist__poll(evlist, 1000);



		for (i = 0; i < evlist->core.nr_mmaps; i++) {

			struct mmap *map = &evlist->mmap[i];

			union perf_event *event;



			if (perf_mmap__read_init(&map->core))

				continue;

			while ((event = perf_mmap__read_event(&map->core)) != NULL) {

				struct evsel *evsel = perf_evlist__event2evsel(evlist, event);



				if (evsel && evsel->side_band.cb)

					evsel->side_band.cb(event, evsel->side_band.data);

				else

					pr_warning("cannot locate proper evsel for the side band event\n");



				perf_mmap__consume(&map->core);

				got_data = true;

			}

			perf_mmap__read_done(&map->core);

		}



		if (draining && !got_data)

			break;

	}

	return NULL;

}



int perf_evlist__start_sb_thread(struct evlist *evlist,

				 struct target *target)

{

	struct evsel *counter;



	if (!evlist)

		return 0;



	if (perf_evlist__create_maps(evlist, target))

		goto out_delete_evlist;



	evlist__for_each_entry(evlist, counter) {

		if (evsel__open(counter, evlist->core.cpus,

				     evlist->core.threads) < 0)

			goto out_delete_evlist;

	}



	if (evlist__mmap(evlist, UINT_MAX))

		goto out_delete_evlist;



	evlist__for_each_entry(evlist, counter) {

		if (evsel__enable(counter))

			goto out_delete_evlist;

	}



	evlist->thread.done = 0;

	if (pthread_create(&evlist->thread.th, NULL, perf_evlist__poll_thread, evlist))

		goto out_delete_evlist;



	return 0;



out_delete_evlist:

	evlist__delete(evlist);

	evlist = NULL;

	return -1;

}



void perf_evlist__stop_sb_thread(struct evlist *evlist)

{

	if (!evlist)

		return;

	evlist->thread.done = 1;

	pthread_join(evlist->thread.th, NULL);

	evlist__delete(evlist);

}

tools/perf/util/sideband_evlist.c

0 → 100644
+125 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only



#include "util/debug.h"

#include "util/evlist.h"

#include "util/evsel.h"

#include "util/mmap.h"

#include <perf/mmap.h>

#include <linux/perf_event.h>

#include <limits.h>

#include <pthread.h>

#include <sched.h>

#include <stdbool.h>



int perf_evlist__add_sb_event(struct evlist *evlist, struct perf_event_attr *attr,

			      perf_evsel__sb_cb_t cb, void *data)

{

	struct evsel *evsel;



	if (!attr->sample_id_all) {

		pr_warning("enabling sample_id_all for all side band events\n");

		attr->sample_id_all = 1;

	}



	evsel = perf_evsel__new_idx(attr, evlist->core.nr_entries);

	if (!evsel)

		return -1;



	evsel->side_band.cb = cb;

	evsel->side_band.data = data;

	evlist__add(evlist, evsel);

	return 0;

}



static void *perf_evlist__poll_thread(void *arg)

{

	struct evlist *evlist = arg;

	bool draining = false;

	int i, done = 0;

	/*

	 * In order to read symbols from other namespaces perf to needs to call

	 * setns(2).  This isn't permitted if the struct_fs has multiple users.

	 * unshare(2) the fs so that we may continue to setns into namespaces

	 * that we're observing when, for instance, reading the build-ids at

	 * the end of a 'perf record' session.

	 */

	unshare(CLONE_FS);



	while (!done) {

		bool got_data = false;



		if (evlist->thread.done)

			draining = true;



		if (!draining)

			evlist__poll(evlist, 1000);



		for (i = 0; i < evlist->core.nr_mmaps; i++) {

			struct mmap *map = &evlist->mmap[i];

			union perf_event *event;



			if (perf_mmap__read_init(&map->core))

				continue;

			while ((event = perf_mmap__read_event(&map->core)) != NULL) {

				struct evsel *evsel = perf_evlist__event2evsel(evlist, event);



				if (evsel && evsel->side_band.cb)

					evsel->side_band.cb(event, evsel->side_band.data);

				else

					pr_warning("cannot locate proper evsel for the side band event\n");



				perf_mmap__consume(&map->core);

				got_data = true;

			}

			perf_mmap__read_done(&map->core);

		}



		if (draining && !got_data)

			break;

	}

	return NULL;

}



int perf_evlist__start_sb_thread(struct evlist *evlist, struct target *target)

{

	struct evsel *counter;



	if (!evlist)

		return 0;



	if (perf_evlist__create_maps(evlist, target))

		goto out_delete_evlist;



	evlist__for_each_entry(evlist, counter) {

		if (evsel__open(counter, evlist->core.cpus, evlist->core.threads) < 0)

			goto out_delete_evlist;

	}



	if (evlist__mmap(evlist, UINT_MAX))

		goto out_delete_evlist;



	evlist__for_each_entry(evlist, counter) {

		if (evsel__enable(counter))

			goto out_delete_evlist;

	}



	evlist->thread.done = 0;

	if (pthread_create(&evlist->thread.th, NULL, perf_evlist__poll_thread, evlist))

		goto out_delete_evlist;



	return 0;



out_delete_evlist:

	evlist__delete(evlist);

	evlist = NULL;

	return -1;

}



void perf_evlist__stop_sb_thread(struct evlist *evlist)

{

	if (!evlist)

		return;

	evlist->thread.done = 1;

	pthread_join(evlist->thread.th, NULL);

	evlist__delete(evlist);

}

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