libperf: Add perf_thread_map__new_dummy() function

Moving the following functions:

  thread_map__new_dummy()
  thread_map__realloc()
  thread_map__set_pid()

to libperf with the following names:

  perf_thread_map__new_dummy()
  perf_thread_map__realloc()
  perf_thread_map__set_pid()

the other 2 functions are dependencies of the
perf_thread_map__new_dummy() function.

The perf_thread_map__realloc() function is not exported.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-33-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/include/internal/threadmap.h

@@ -18,4 +18,6 @@ struct perf_thread_map {
 	struct thread_map_data map[];
 };
 
+struct perf_thread_map *perf_thread_map__realloc(struct perf_thread_map *map, int nr);
+
 #endif /* __LIBPERF_INTERNAL_THREADMAP_H */

tools/perf/lib/include/perf/threadmap.h

@@ -2,6 +2,13 @@
 #ifndef __LIBPERF_THREADMAP_H
 #define __LIBPERF_THREADMAP_H
 
+#include <perf/core.h>
+#include <sys/types.h>
+
 struct perf_thread_map;
 
+LIBPERF_API struct perf_thread_map *perf_thread_map__new_dummy(void);
+
+LIBPERF_API void perf_thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid);
+
 #endif /* __LIBPERF_THREADMAP_H */

tools/perf/lib/libperf.map

@@ -4,6 +4,8 @@ LIBPERF_0.0.1 {
 		perf_cpu_map__dummy_new;
 		perf_cpu_map__get;
 		perf_cpu_map__put;
+		perf_thread_map__new_dummy;
+		perf_thread_map__set_pid;
 	local:
 		*;
 };

tools/perf/lib/threadmap.c

@@ -3,3 +3,46 @@
 #include <stdlib.h>
 #include <linux/refcount.h>
 #include <internal/threadmap.h>
+#include <string.h>
+
+static void perf_thread_map__reset(struct perf_thread_map *map, int start, int nr)
+{
+	size_t size = (nr - start) * sizeof(map->map[0]);
+
+	memset(&map->map[start], 0, size);
+	map->err_thread = -1;
+}
+
+struct perf_thread_map *perf_thread_map__realloc(struct perf_thread_map *map, int nr)
+{
+	size_t size = sizeof(*map) + sizeof(map->map[0]) * nr;
+	int start = map ? map->nr : 0;
+
+	map = realloc(map, size);
+	/*
+	 * We only realloc to add more items, let's reset new items.
+	 */
+	if (map)
+		perf_thread_map__reset(map, start, nr);
+
+	return map;
+}
+
+#define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
+
+void perf_thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid)
+{
+	map->map[thread].pid = pid;
+}
+
+struct perf_thread_map *perf_thread_map__new_dummy(void)
+{
+	struct perf_thread_map *threads = thread_map__alloc(1);
+
+	if (threads != NULL) {
+		perf_thread_map__set_pid(threads, 0, -1);
+		threads->nr = 1;
+		refcount_set(&threads->refcnt, 1);
+	}
+	return threads;
+}

tools/perf/tests/openat-syscall-tp-fields.c

@@ -58,7 +58,7 @@ int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest
 
 	perf_evsel__config(evsel, &opts, NULL);
 
-	thread_map__set_pid(evlist->threads, 0, getpid());
+	perf_thread_map__set_pid(evlist->threads, 0, getpid());
 
 	err = evlist__open(evlist);
 	if (err < 0) {

tools/perf/tests/thread-map.c

@@ -35,7 +35,7 @@ int test__thread_map(struct test *test __maybe_unused, int subtest __maybe_unuse
 	thread_map__put(map);
 
 	/* test dummy pid */
-	map = thread_map__new_dummy();
+	map = perf_thread_map__new_dummy();
 	TEST_ASSERT_VAL("failed to alloc map", map);
 
 	thread_map__read_comms(map);

tools/perf/util/evlist.c

@@ -1375,7 +1375,7 @@ static int perf_evlist__create_syswide_maps(struct evlist *evlist)
 	if (!cpus)
 		goto out;
 
-	threads = thread_map__new_dummy();
+	threads = perf_thread_map__new_dummy();
 	if (!threads)
 		goto out_put;
 
@@ -1504,7 +1504,7 @@ int perf_evlist__prepare_workload(struct evlist *evlist, struct target *target,
 				__func__, __LINE__);
 			goto out_close_pipes;
 		}
-		thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
+		perf_thread_map__set_pid(evlist->threads, 0, evlist->workload.pid);
 	}
 
 	close(child_ready_pipe[1]);

tools/perf/util/thread_map.c

@@ -28,30 +28,7 @@ static int filter(const struct dirent *dir)
 		return 1;
 }
 
-static void thread_map__reset(struct perf_thread_map *map, int start, int nr)
-{
-	size_t size = (nr - start) * sizeof(map->map[0]);
-
-	memset(&map->map[start], 0, size);
-	map->err_thread = -1;
-}
-
-static struct perf_thread_map *thread_map__realloc(struct perf_thread_map *map, int nr)
-{
-	size_t size = sizeof(*map) + sizeof(map->map[0]) * nr;
-	int start = map ? map->nr : 0;
-
-	map = realloc(map, size);
-	/*
-	 * We only realloc to add more items, let's reset new items.
-	 */
-	if (map)
-		thread_map__reset(map, start, nr);
-
-	return map;
-}
-
-#define thread_map__alloc(__nr) thread_map__realloc(NULL, __nr)
+#define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
 
 struct perf_thread_map *thread_map__new_by_pid(pid_t pid)
 {
@@ -69,7 +46,7 @@ struct perf_thread_map *thread_map__new_by_pid(pid_t pid)
 	threads = thread_map__alloc(items);
 	if (threads != NULL) {
 		for (i = 0; i < items; i++)
-			thread_map__set_pid(threads, i, atoi(namelist[i]->d_name));
+			perf_thread_map__set_pid(threads, i, atoi(namelist[i]->d_name));
 		threads->nr = items;
 		refcount_set(&threads->refcnt, 1);
 	}
@@ -86,7 +63,7 @@ struct perf_thread_map *thread_map__new_by_tid(pid_t tid)
 	struct perf_thread_map *threads = thread_map__alloc(1);
 
 	if (threads != NULL) {
-		thread_map__set_pid(threads, 0, tid);
+		perf_thread_map__set_pid(threads, 0, tid);
 		threads->nr = 1;
 		refcount_set(&threads->refcnt, 1);
 	}
@@ -142,7 +119,7 @@ static struct perf_thread_map *__thread_map__new_all_cpus(uid_t uid)
 		if (grow) {
 			struct perf_thread_map *tmp;
 
-			tmp = thread_map__realloc(threads, max_threads);
+			tmp = perf_thread_map__realloc(threads, max_threads);
 			if (tmp == NULL)
 				goto out_free_namelist;
 
@@ -150,8 +127,8 @@ static struct perf_thread_map *__thread_map__new_all_cpus(uid_t uid)
 		}
 
 		for (i = 0; i < items; i++) {
-			thread_map__set_pid(threads, threads->nr + i,
-					    atoi(namelist[i]->d_name));
+			perf_thread_map__set_pid(threads, threads->nr + i,
+						    atoi(namelist[i]->d_name));
 		}
 
 		for (i = 0; i < items; i++)
@@ -233,14 +210,14 @@ static struct perf_thread_map *thread_map__new_by_pid_str(const char *pid_str)
 			goto out_free_threads;
 
 		total_tasks += items;
-		nt = thread_map__realloc(threads, total_tasks);
+		nt = perf_thread_map__realloc(threads, total_tasks);
 		if (nt == NULL)
 			goto out_free_namelist;
 
 		threads = nt;
 
 		for (i = 0; i < items; i++) {
-			thread_map__set_pid(threads, j++, atoi(namelist[i]->d_name));
+			perf_thread_map__set_pid(threads, j++, atoi(namelist[i]->d_name));
 			zfree(&namelist[i]);
 		}
 		threads->nr = total_tasks;
@@ -263,18 +240,6 @@ static struct perf_thread_map *thread_map__new_by_pid_str(const char *pid_str)
 	goto out;
 }
 
-struct perf_thread_map *thread_map__new_dummy(void)
-{
-	struct perf_thread_map *threads = thread_map__alloc(1);
-
-	if (threads != NULL) {
-		thread_map__set_pid(threads, 0, -1);
-		threads->nr = 1;
-		refcount_set(&threads->refcnt, 1);
-	}
-	return threads;
-}
-
 struct perf_thread_map *thread_map__new_by_tid_str(const char *tid_str)
 {
 	struct perf_thread_map *threads = NULL, *nt;
@@ -287,7 +252,7 @@ struct perf_thread_map *thread_map__new_by_tid_str(const char *tid_str)
 
 	/* perf-stat expects threads to be generated even if tid not given */
 	if (!tid_str)
-		return thread_map__new_dummy();
+		return perf_thread_map__new_dummy();
 
 	slist = strlist__new(tid_str, &slist_config);
 	if (!slist)
@@ -304,13 +269,13 @@ struct perf_thread_map *thread_map__new_by_tid_str(const char *tid_str)
 			continue;
 
 		ntasks++;
-		nt = thread_map__realloc(threads, ntasks);
+		nt = perf_thread_map__realloc(threads, ntasks);
 
 		if (nt == NULL)
 			goto out_free_threads;
 
 		threads = nt;
-		thread_map__set_pid(threads, ntasks - 1, tid);
+		perf_thread_map__set_pid(threads, ntasks - 1, tid);
 		threads->nr = ntasks;
 	}
 out:
@@ -437,7 +402,7 @@ static void thread_map__copy_event(struct perf_thread_map *threads,
 	threads->nr = (int) event->nr;
 
 	for (i = 0; i < event->nr; i++) {
-		thread_map__set_pid(threads, i, (pid_t) event->entries[i].pid);
+		perf_thread_map__set_pid(threads, i, (pid_t) event->entries[i].pid);
 		threads->map[i].comm = strndup(event->entries[i].comm, 16);
 	}
 

tools/perf/util/thread_map.h

@@ -6,6 +6,7 @@
 #include <stdio.h>
 #include <linux/refcount.h>
 #include <internal/threadmap.h>
+#include <perf/threadmap.h>
 
 struct thread_map_event;
 
@@ -37,12 +38,6 @@ static inline pid_t thread_map__pid(struct perf_thread_map *map, int thread)
 	return map->map[thread].pid;
 }
 
-static inline void
-thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid)
-{
-	map->map[thread].pid = pid;
-}
-
 static inline char *thread_map__comm(struct perf_thread_map *map, int thread)
 {
 	return map->map[thread].comm;