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>

4 files changed, 54 insertions, 0 deletions

diff --git a/tools/perf/lib/include/internal/threadmap.h b/tools/perf/lib/include/internal/threadmap.h
index c8088005a9ab..df748baf9eda 100644
--- a/tools/perf/lib/include/internal/threadmap.h
+++ b/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 */
diff --git a/tools/perf/lib/include/perf/threadmap.h b/tools/perf/lib/include/perf/threadmap.h
index dc3a3837b56f..34ed7f587101 100644
--- a/tools/perf/lib/include/perf/threadmap.h
+++ b/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 */
diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map
index 76ce3bc59dd8..6b4ec1c4d3f3 100644
--- a/tools/perf/lib/libperf.map
+++ b/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:
                 *;
 };
diff --git a/tools/perf/lib/threadmap.c b/tools/perf/lib/threadmap.c
index 163dc609b909..23e628a1437a 100644
--- a/tools/perf/lib/threadmap.c
+++ b/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;
+}